IBIC 2015

14 Sept 2015, 08:00 → 17 Sept 2015, 18:00 Australia/Melbourne

MCEC

Mark Boland (Australian Synchrotron)

International Beam Instrumentation Conference 2015

Monday 14 September

Welcome

MOALA: Introduction

Convener: Dr Mark Boland (Australian Synchrotron)

1 An Overview of Asian Accelerator Developments & Upcoming Construction Projects

An overview of Asian accelerator developments & upcoming construction projects.

Speaker: Prof. Zhentang Zhao (SINAP)

Slides Mon_105_0900_Z_Zhao_v3.ppt

2 Developments from the World of High Energy Physics of Interest for Beam Instrumentation

Developments from the World of High Energy Physics of Interest for Beam Instrumentation

Speaker: Prof. Geoffrey Taylor (University of Melbourne)

Slides Mon_0950_G_Taylor.pptx

Morning Tea

Break

MOBLA: Overview and Commissioning

Convener: Kay Wittenburg (Desy)

3 The Role of Beam Diagnostics in the Rapid Commissioning of the TPS Booster and Storage Ring

The TPS is a newly constructed 3-GeV third-generation synchrotron light source featuring ultra-high photon brightness with extremely low emittance. After some hardware improvement especially demagnetization of chamber are completed, the commissioning of the beam in the booster ring began on December 12 and attained 3-GeV energy on December 16. The storage ring obtained its first stored beam and delivered synchrotron light on December 31. This report summarizes the role of beam diagnostic for hardware improvement and parameter tuning during TPS successful commissioning.

Speaker: Pei-Chen Chiu (NSRRC)

Slides Mon_105_1100_Pei_Chen_Chiu.pptx

4 SNS Beam Diagnostics: Ten Years after Commissioning

The Spallation Neutron Source, a neutron scattering user facility based on a 1.4MW proton accelerator, has been in operation since 2006. The accelerator beam diagnostics were designed, in large degree, with commissioning unknowns in mind. Today we face new challenges to support stable 1MW beam power operations and accelerator upgrade for even higher power. The beam instrumentation problems span a range from mitigating obsolescence of many electronics to developing new techniques for measuring beam parameters important for high power operation. This report describes several examples of the ongoing work: development of new electronics for Beam Position Monitor (BPM) and Beam Loss Monitor (BLM) systems to replace the aging designs; development of large dynamic range and high precision beam phase space characterization tools to facilitate the model based accelerator tuning.

Speaker: Alexander Aleksandrov (ORNL)

Slides MON_105_1140_A_ALEKSANDROV.pptx

5 Overview and Status of Swissfel Diagnostics

SwissFEL is an X-ray free electron laser user facility presently under construction at the Paul Scherrer Institut (PSI) in Villigen, Switzerland. All diagnostics systems have been developed and successfully tested within the baseline SwissFEL parameters, including a low charge, ultra-short pulse operation mode. The monitor designs have been finished, production is ongoing and most of the components are ready for installation. The paper will give an overview of the SwissFEL diagnostics system, summarize the latest results and report on the installation and commissioning schedule.

Speaker: Volker Schlott (PSI)

Slides Mon_105_1200_V_Schlott.ppt

Lunch

Break

MOCLA: Time Resolved Diagnostics and Synchronization

Convener: Steve Smith (SLAC)

6 Microbunching Instability in Relativistic Electron Bunches: Direct Observations of the Microstructures Using Ultrafast YBCO Detectors

Relativistic electron bunches circulating in accelerators are subjected to a dynamical instability leading to microstructures at millimeter to centimeter scale. Although this is a well-known fact, direct experimental observations of the structures, or the field that they emit, remained up to now an open problem. Here, we report the direct, shot-by-shot, time-resolved recording of the shapes (including envelope and carrier) of the pulses of coherent synchrotron radiation that are emitted, and that are a signature of the electron bunch microstructure. The experiments are performed on the UVSOR-III storage ring, using electrical field sensitive YBa2Cu3O7−x thin-film ultrafast detectors. The observed patterns are subjected to permanent drifts, that can be explained from a reasoning in phase space, using macroparticle simulations.

Speaker: Eleonore Roussel (Elettra)

Slides Mon_105_1400_E_Roussel_roussel.pdf

7 Design of a Compact L-band Transverse Deflecting Cavity with Arbitrary Polarisations for the SACLA Injector

We are planning to install a transverse deflecting cavity (TCAV) in the injector of the X-ray free electron laser (XFEL) facility, SACLA [*], in order to measure longitudinal bunch profiles after a velocity bunching process. This is because the longitudinal bunch profile in the injector is critically important for reproducing the XFEL performance [**]. The TCAV will be installed at the end of the velocity bunching section, where the bunch length ranges from 10 ps to several 100 ps, the kinetic energy of the beam is approximately 1 MeV, and the transverse beam motion is rotated by solenoid lenses. Considering these conditions, we designed a compact L-band (1428 MHz) TM110-mode pillbox-shape TCAV (~300 mm-diameter and ~100 mm-long) with two input ports intersecting at a right angle. One of the advantages of this TCAV is that the polarisation of a deflecting rf field can be freely chosen, e.g. linear or circular, by changing the amplitude and phase at each rf port. We can select the linear polarisation for linear streaking with an arbitrary direction, or the circular one for axially symmetric deflection to reduce transverse mixing due to a solenoid B-field, depending on the situation. Footnotes [*] T. Ishikawa, et al., Nature Photonics 6, 540-544 (2012). [**] T. Asaka, et al., Proceedings of LINAC2012, 486-488, TUPB006, (2012).

Speaker: Hirokazu Maesaka (RIKEN SPring-8 Center)

Slides Mon_105_1440_H_Maesaka.pptx

8 Fully Intensity and Timing Jitter Compensated Ultra-Fast Experiments at Accelerator-Driven Photonsources at High Repetition Rates

Timing jitter and power instabilities are crucial parameters which greatly reduce the applicability of accelerator driven light sources for time-resolved experiments. In this contribution we present a technique that allows achieving few 10 fs time-resolution in experiments operating at cw repetition rates of up to 100 kHz by employing high repetition rate data acquisition. The method employs a fs-level arrival time monitor based on electro-optic sampling* ** of residual pulses from a coherent diffraction radiator and a fast THz detector allowing for pulse to pulse detection of arrival time and pump intensity. The monitor can operate at high repetition rates cw (presently up to a few 100 kHz) and low electron bunch charges (sub pC). The prototype device has been tested at the quasi CW SRF accelerator (ELBE) by performing an ultra-fast THz driven magnetization dynamics experiment***. Our method has high potential to provide few fs level timing on next generation large scale X-ray photon sources based on high repetition rate electron accelerators such as LCLSII. A demonstrator aiming at operation up to 4.7 MHz is under development for the European X-FEL. Footnotes * Z. Jiang, X. C. Zhang, IEEE Journal of Quantum Electronics, 36, 1214, 2000 ** I. Wilke et al., Phys. Rev. Lett., 88, 124801, 2002. *** S. Kovalev et. al., under review (2015).

Speaker: Sergey Kovalev (HZDR)

15:30 Coffee Break

MOPB

Tuesday 15 September

TUALA: Tutorial 1

9 Beam Arrival Time Monitors

This is an overview of beam arrival time measurement techniques for FELs and other accelerators requiring femtosecond timing. This talk will present the trade-offs between the various techniques used at different facilities.

Speaker: Josef Frisch (SLAC)

Slides Tue_105_0900_J_Frisch.PPTX

10 Transverse Profiling of an Intense FEL X-Ray Beam Using a Probe Electron Beam

Monitoring the pulse by pulse output intensity and profile of an FEL is a critical measurement both for users and for optimising the accelerator drive beam. The diagnostic challenge is to find a technique that is not susceptible to damage at high output power, is noninvasive and can be performed at high repetition rates. Fluorescent screens are invasive, susceptible to damage and limited in repetition rate by the camera readout. Gas cell monitors are noninvasive but only yield intensity information and suffer from residual ionisation at high repetition rates. The technique described here uses the scattering of a beam of low-energy electrons as they are scanned across the photon beam to measure the transverse intensity profile of the photon beam. Two different geometries are compared. One is where a finely focused electron beam is scanned transversely across the photon beam to measure the transverse profile. The second is where the electrons are bent onto the axis of the photon beam and are scattered by the counter propagating beam of photons. Here the electron beam is kept larger in diameter than the photon beam so that the photon pulse intensity can be measured by the scattering.

Speaker: Patrick Krejcik (SLAC)

Slides Tue__105_1010_P_Krejcik.pptx

10:30 Coffee Break

TUBLA: BPMs and Beam Stability 1

11 Beam Based Calibration for Beam Position Monitors

Beam position monitoring is one of most fundamental diagnostic tool in accelerator. To keep good performance of the BPM system, the beam-based alignment method is developed and used for more precise BPM alignment and keeping the performance. The signal from BPM is transfer by coaxial cable, and processed by signal processing circuit. The beam position is calculating from the relative ratio between the 4 intensities from the BPM head. The characteristic of circuit gain is calibrated in the beginning by using the test bench. But this calibration will be changed with passing year. To escape from this problem, a same kind of calibration for the gain as like as beam-based alignment is key issue to maintain a good performance of the BPM system. For this propose, a beam-based gain calibration method is developed and used in the KEK. The both of beam-based alignment method and beam based gain calibration method present using concrete examples.

Speaker: Masaki Tejima (KEK)

Slides Tue_105_1100_M_Tejima.pptx

12 Progress Towards Electron-Beam Feedback at the Nanometre Level at the Accelerator Test Facility (ATF2) at KEK

Ultra-low latency beam-based digital feedbacks have been developed by the Feedback On Nanosecond Timescales (FONT) Group and tested at the Accelerator Test Facility (ATF2) at KEK in a programme aimed at beam stabilisation at the nanometre level at the ATF2 final focus. Three prototypes were tested: 1) A feedback system based on high-resolution stripline BPMs was used to stabilise the beam orbit in the beamline region c. 50m upstream of the final focus. 2) Information from this system was used in a feed-forward mode to stabilise the beam locally at the final focus. 3) A final-focus local feedback system utilising cavity BPMs was deployed. In all three cases the degree of beam stabilisation was observed in high-precision cavity BPMs at the ATF2 interaction point. Latest results are reported on stabilising the beam position to approximately 50nm.

Speaker: Philip Burrows (JAI)

Slides Tue_105_1140_P_Burrows.ppt

13 Status of the Intrabunch-Feedback Feedback at J-PARC Main Ring

One of the present obstacles for intensity upgrade of the J-PARC Main Ring is transverse collective instability. We have been developing so called intra-bunch feedback system and in operation during injection flat bottom since last year. But recent beam intensity upgrade push us to improve further the system, namely feedback during acceleration. The revolution frequency changes about 2% and the synchronous phase varies 0 - 26 degree during acceleration from 3 to 30 GeV in the MR. The delay in the feedback loop is changed stepwise triggered by external pulses. We are examining quick trigger timing determination by matching the bunch shape in the controller ("iGp12") to the one from the exciter (kicker) and estimating differences of slice markers in time. This method is time saving, which is important because of a limited machine tuning time. We will report present status of the feedback during acceleration.

Speaker: Takeshi Toyama (J-PARC)

Slides Tue_105_1200_Takeshi_Toyama.pptx

12:30 Lunch Break

TUCLA: Transverse Profile Monitors 1

14 Direct Observation of Ultralow Vertical Emittance Using a Vertical Undulator

In recent work, the first quantitative measurements of electron beam vertical emittance using a vertical undulator were presented, with particular emphasis given to ultralow vertical emittances*. Using this apparatus, a geometric vertical emittance of 0.9 +- 0.3 pm rad has been observed. A critical analysis is given of measurement approaches that were attempted, with particular emphasis on systematic and statistical uncertainties. The method used is explained, compared to other techniques and the applicability of these results to other scenarios discussed.

Speaker: Kent Wootton (SLAC)

Slides TUCLA01_talk.pptx

15 Design of Coronagraph for the Observation of Beam Halo at LHC

In the LHC, the beam halo due to higher beam energy and intensities will increase the impact on LHC machine protection and on luminosity performance. Measurement of the beam halo distribution is therefore important for understanding and controlling the beam halo. A coronagraph was designed for the observation of the beam halo population. A new optical design of the coronagraph is made for the halo observation in the LHC. For convenience of masking the core image, we need a large transverse magnification. For this purpose, a telephoto lens arrangement is applied to the adjective lens to extend the focal length to obtain a large transverse magnification. The result of diffraction analysis, the contrast is estimated better than 10E6. Since the beam halo is estimated to 10E4 -10E5 of the core intensity, the coronagraph is estimated to have enough contrast for the observation of beam halo distribution at LHC. This paper describes the detail study of the coronagraph for the LHC for the observation of transverse profile of the beam halo with a contrast down to a level of 10E-6 compared to the peak intensity of the beam core.

Speaker: Prof. Mitsuhashi Toshiyuki (KEK)

Slides Tue_105_1440_T_Mitsuhashi_V3.pptx

16 Recent Progress in X-Ray Emittance Diagnostics at SPring-8

Synchrotron radiation in the X-ray range is suitable for non-destructive diagnostics of beam emittance *. Both direct imaging and interferometric techniques can resolve the micrometer-order transverse beam size. The beam emittance is obtained from the measured beam size with the knowledge of the betatron and dispersion functions and the beam energy spread. At the SPring-8 storage ring, we have recently developed two X-ray instruments for emittance diagnostics. The one for a bending magnet source is the X-ray pinhole camera which directly images the beam profile. A pinhole in the atmosphere is composed of combined narrow X-Y slits made of tungsten. A scintillator crystal is used to convert the X-ray beam image to a visible image. The spatial resolution is about 7 micrometers. It is operated for continuous emittance diagnostics and coupling correction of user operation of SPring-8. The other for an undulator source is the X-ray Fresnel diffractometry monitor **. Monochromatic X-rays are cut out by a single slit, and the vertical beam size is deduced from the depth of the central dip in a double-lobed diffraction pattern. Resolving beam size less than 5 micrometers is feasible. Footnotes * S. Takano, IPAC2010 WEZMH01, p2392. (2010) ** M. Masaki et al., Phys. Rev. ST Accel. Beams 18, 042802 (2015).

Speaker: Shiro Takano (JASRI/SPring-8)

Slides Tue_105_1500_S_Takano.pptx

15:30 Coffee Break

TUPB

18:00 Happy Hour

Public Lecture

17 Shared Views of the Southern Sky

Public Lecture

Speaker: Dr Alan Duffy (Swinburne University)

Wednesday 16 September

WEALA: Tutorial 2

18 Radiation Damage Considerations in Accelerator Beam Environments

The impact of radiation upon equipment used on accelerator beam lines is a continuing concern. Materials, cabling and instrumentation will experience aging and degradation and even failure depending on the nature of the radiation and the intensity of the fields. This discussion will review the fundamentals of radiation interactions and look at possible mechanisms for damage. In the case of electron accelerators producing photon beams, ionization effects will tend to dominate but if the energies are high enough, secondary charged particles and neutrons are created that can cause atomic displacements and even impurity production. We can also distinguish between cumulative effects and single event effects. For instrumentation, the topic of radiation damage can be divided into electromagnetic and bulk damage components. Hadrons can also produce bulk damage. Strategies to minimise or delay the effects of radiation damage need to take these issues into account. Some examples will be discussed.

Speaker: Dr David Webb (ARPANSA)

Slides Wed_105_0900_D_Webb_v2.pptx

19 First LHC Emittance Measurements at 6.5 TeV

During LHC Run 1 significant transverse emittance growth through the LHC cycle was observed. Measurements indicated most of the blow-up to occur during the injection plateau and the ramp. Intra beam scattering was one of the main drivers of emittance growth. However, finding a good wire scanner working point was difficult. Photomultiplier saturation added uncertainty on all measurements. A large discrepancy between emittances from wire scanners and luminosity was discovered but not solved. During Long Shutdown 1 the wire scanner system was upgraded with new photomultipliers. In April 2015 the LHC re-started with collision energy of 6.5 TeV per beam. This paper presents the first transverse emittance measurements through the LHC Run 2 cycle with low beam intensity. Comparisons with data from the synchrotron light monitors and the LHC experiments will be discussed and results summarized. In addition, a thorough study of wire scanner photomultiplier saturation will be presented. Finally, the emittance growth results will be compared to intra beam scattering simulations.

Speaker: Maria Kuhn (CERN)

Slides WED_105_1010_M_Kuhn.pptx

10:30 Coffee Break

WEBLA: Beam Loss Detection

20 Beam Loss Monitoring for Demanding Environments

Beam loss monitoring (BLM) is a key protection system for machines using beams with damage potential and is an essential beam diagnostic tool for any machine. All BLM systems are based on the observation of secondary particle showers originating from escaping beam particles. With ever higher beam energies and intensities, the loss of even a tiny fraction of the beam can lead to damage or, in the case of superconducting machines, quenches. Losses also lead to material ageing and activation and should therefore be well controlled and reduced to a minimum. The ideal BLM system would have full machine coverage and the capability to accurately quantify the number of lost beam particles from the measured secondary shower. Position and time resolution, dynamic range, noise levels and radiation hardness all have to be considered, while at the same time optimising the system for reliability, availability and maintainability. This contribution will focus on design choices for BLM systems operating in demanding environments, with a special emphasis on measuring particle losses in the presence of synchrotron radiation and other background sources.

Speaker: Barbara Holzer (CERN)

Slides Holzer_IBIC2015_server.pdf

21 Development of the Beam Loss Monitor for Beam Halo Measurement in the J-PARC RCS

In the J-PARC RCS, transverse beam profiles including both the beam core and halo at the extraction beam transport line (3NBT) were measured by using a combination with a wire scanner type beam scraper and beam loss monitors (BLMs). Our final goal of this halo monitor is to measure the intra-bunch beam halo of extracted two bunches from the RCS. Thus the plastic scintillator and photomultiplier (PMT) assemblages were adopted as the BLMs with quick time response. However, we found that the BLMs detected not only the radiation from the wire but also the reflected radiation from other devices and walls. Therefore we tried to develop new-type BLMs, which are scintillation-type BLM with lead glass and Cherenkov-type BLM with quartz or UV acrylic. In this presentation, we will present an overview and experimental results of the new-type BLMs together with an outline of halo monitor system.

Speaker: Masahiro Yoshimoto (JAEA/J-PARC)

Slides WED_105_1140_M_Yoshimoto_V2.pptx

22 Position Resolution of Optical Fibre-Based Beam Loss Monitors Using Long Electron Pulses

Beam loss monitoring systems based on optical fibres (oBLM), have been under consideration for future colliders for several years. To distinguish losses between consecutive quadrupoles, a position resolution of less than 1 m is required. A resolution of better than 0.5 m has been achieved in machines with single, nanosecond long pulses. For longer beam pulses, such as the ~150 ns CLIC pulse, the longitudinal length of signals in the fibre is close to the duration of the beam pulse itself which makes loss reconstruction very challenging. In this contribution, results from experiments into the position resolution of an oBLM based on long beam pulses are presented. These measurements have been performed at the CLIC Test Facility (CTF3) and the Australian Synchrotron Light Source (ASLS). In CTF3, controlled beam losses were created at different quadrupoles in the 28 m long decelerating Test Beam Line (TBL) LINAC by altering the current supplied or misaligning them. In ASLS the flexibility of the facility allowed the location of beam losses generated by single bunches to be studied as well as losses for longer bunch trains up to 600 ns in duration.

Speaker: Eduardo Nebot (CERN)

Slides WED_105_1200_E_NEBOT.pdf

12:30 Lunch Break

WECLA: Beam Charge Monitors and Other Instruments

23 Wideband Vertical Intra-Bunch Feedback at the SPS - Technology Development, Recent Accelerator Measurements, and Next Steps

A wideband vertical intra-bunch feedback system is in development at the CERN SPS for use to control potential Ecloud and TMCI instabilities. The work is motivated by planned intensity increases from the LIU and HL-LHC upgrade programs. System technical features include pickups, upgraded kickers and related RF power amplifiers, analog processing with 1 GHz bandwidth, with a with 4 GS/sec reconfigurable digital signal processing system. Recent results include driven beam experiments and beam simulation methods to verify the damping provided by the wideband system, and validate reduced MIMO models and model-based controllers. Noise effects and uncertainties in the model are evaluated via SPS measurements to predict the limits of control techniques applied to stabilize the intrabunch dynamics. We present data showing the excitation and damping of unstable modes. The plans for the next year, including experimental measurements, hardware upgrades and future control developments are described.

Speaker: John Fox (SLAC)

Slides wed_105_1400_J_Fox.pdf

24 Commissioning of the New Online-Radiation-Monitoring-System at the New European XFEL Injector with First Tests of the High-Sensitivity-Mode for Intra-Tunnel Rack Surveillance

The new Embedded Online-Radiation-Monitoring-System, developed for the 17.5 GeV superconducting European XFEL (E-XFEL) that is currently being built between the DESY campus at Hamburg and Schenefeld at Schleswig-Holstein [1,2], has been commissioned in a first system test setup at the E-XFEL Injector. As most of the electronic systems for machine control, diagnostics and safety of the E-XFEL will be located in cabinets inside the accelerator tunnel, the test setup incorporates all system parts like cabinet-internal and -external monitor electronics, infrastructure interface boards, firmware, software, cabling and sensors. Hence the commissioning system setup gives the possibility for first operation of the complete online radiation monitoring system under realistic environmental conditions in terms of irradiation, electromagnetic interference (EMI) inside the injector tunnel, as well as operational and control system aspects. Commissioning results and measurements based on different internal and external sensor channels will be presented here, together with recent measurements done at different radiation sources using the high-sensibility mode for intra-rack radiation monitoring.

Speaker: Frank Schmidt-Foehre (DESY)

Slides Wed_105_1440_F_Schmidt-Foehre.pptx

25 HTc-SQUID Beam Current Monitor at the RIBF

A high critical temperature (HTc) superconducting quantum interference device (SQUID) beam current monitor (SQUID monitor) has been built and installed in the beam transport line in the radioactive isotope beam factory (RIBF) at RIKEN in Japan. The SQUID monitor can measure the DC current of heavy-ion beams non-destructively at high resolution. Unlike at other existing facilities, as a low vibration, pulse-tube refrigerator cools the HTc fabrications including the SQUID, the size of the system is reduced and the running costs are lowered. Recently, the magnetic shielding system has been greatly reinforced. The measurement resolution is determined by the signal to noise ratio, which is improved by attenuating the external magnetic noise. Furthermore, the data acquisition and control program, currently being written using LabVIEW is providing the trend graph of the measured beam current. In this graph it was observed that the amplitude of ripples in the modulated beam current increased with the beam current. Here we report the details of SQUID monitoring system and the results of the beam measurement.

Speaker: Tamaki Watanabe (RIKEN Nishina Center)

Slides Wed_105_1500_T_Watanabe.pptx

15:30 Coffee Break

WEDLA: Contributed Orals

26 First Results of Solaris Synchrotron Commissioning

Solaris is a third generation light source recently constructed at the Jagiellonian University in Krakow. The installation of the 600 MeV S-band linear accelerator with thermionic RF gun and transfer line as well as the 1.5 GeV storage ring is now complete. In November 2014 subsystem tests and conditioning of the Solaris linac were started. A 300 MeV electron beam at the end of the linac was observed for the first time in February 2015 after which the machine was shut down for 2.5 months to complete transfer line and storage ring installation. In May the commissioning of the linac together with the transfer line and storage ring began. The beam was soon observed on the YAG screen monitor, installed at the injection straight in the storage ring. The beam current measured with the fast current transformer in the transfer line was 8 mA over 180 ns, at 360 MeV. The commissioning of the machine is still in progress and preliminary results of Solaris are presented.

Speaker: Adriana Wawrzyniak (Solaris)

Slides Wed_105_1600_A_Wawrzyniak.pptx

27 High Frequency Electro-Optic Beam Position Monitors for Intra-Bunch Diagnostics at the LHC

At the HL-LHC, proton bunches will be rotated by crab-cavities close to the interaction regions to maximize the luminosity. A method to rapidly monitor the transverse position of particles within each 1ns bunch is required. A novel, compact beam diagnostic to measure the bunch rotation is under development, based on electro-optic crystals, which have sufficient time resolution (<50ps) to monitor intra-bunch perturbations. The electro-optic beam position monitor uses two pairs of crystals, mounted on opposite sides of the beam pipe, whose birefringence is modified by the electric field of passing charged particle beam. The change of birefringence depends on the electric field which itself depends on the beam position, and is measured using polarized laser beams. The electro-optic response of the crystal to the passing bunch has been simulated for HL-LHC bunch scenarios. An electro-optical test stand including a high voltage modulator has been developed to characterize LiTaO3 and LiNiO3 crystals. Tests to validate the different optical configurations will be reviewed. The opto-mechanical design of an electro-optic prototype that will be installed in the CERN SPS will be presented.

Speaker: Stephen Gibson (Royal Holloway)

Slides Wed_105_1620_S_Gibson.pdf

28 Beam profile monitor at the 1 MW spallation neutron source

At the Japanese Spallation Neutron Source (JSNS) using a mercury target, the transverse beam profile of 3 GeV beam having the power of 1 MW is measured by a multi-wire profile monitor (MWPM) placed at the proton beam window (PBW) being the separator between vacuum and helium area at the target station. The profile monitor is crucial because the beam peak current density should be kept as low as possible to mitigate the damage at the mercury target vessel due to the pitting erosion caused by the high power proton beam. Simple beam expantion at the target is useless because it simply increases the heat load and the radiation dose at the entrance of the target. To mitigate damage, a beam flattening system using non-linear optics with octupole magnets has been developed. It was confirmed the beam shape was controlled as designed using calculations. In order to obtain a 2D profile, we have begun using the profile monitor by observing the infrared from the target by imaging a capillary tube. At JSNS the life time of the PBW is important. To improve the lifetime of the PBW, we measure the gas production rate by using a beam dump.

Speaker: Shin-ichiro Meigo (JAEA/J-PARC)

Slides Wed_105_1640_S_Meigo_v2.pptx

17:30 Bus to MCG Tour

29 MCG Tour

18:30 Bus to IBIC banquet

Conference Banquet

Thursday 17 September

Tutorial 3

30 Beam Position Measurement System Design

For newcomers, but also with interesting details for oldies, all components of a modern beam position measurement system are reviewed and explained. From specifications, sensor types, analogue and digital electronics over calibration methods the whole field will be covered. At the end some measurement examples will be shown and well as an outlook to upcoming research and developments.

Speaker: Hermann Schmickler (CERN)

Slides Thu_105_0900_H_Schmickler.pptx

31 Characterization of NSLS2 Storage Ring Beam Orbit Stability

Similar to other advanced third generation light sources, NSLS2 storage ring has stringent requirements on beam orbit stability. NSLS2 BPMs can be synchronously triggered to record turn by turn or fast acquisition 10kHz data. Spectrum of these data reveals various beam motion frequencies and it has been characterized at various machine conditions. Compared to the ground motion and utility system vibration spectra, beam motion introduced by the vibrations can be identified. An algorithm to locate possible noise sources from the measured spectrum has been developed. Preliminary results of locating orbit sources will be discussed in this paper as well.

Speaker: Weixing Cheng (BNL)

Slides Thu_1010_W_CHENG.PPTX

10:30 Coffee Break

Closing Session: Closing

32 Summary of the 2014 Beam-Halo Monitoring Workshop

Understanding and controlling beam halo is important for high-intensity hadron accelerators, for high-brightness electron linacs, and for low-emittance light sources. This can only be achieved by developing suitable diagnostics. The main challenge faced by such instrumentation is the high dynamic range needed to observe the halo in the presence of an intense core. In addition, measurements must often be made non-invasively. This talk summarizes the one-day workshop on Beam Halo Monitoring that was held at SLAC on September 19 last year, immediately following IBIC 2014 in Monterey. Workshop presentations described invasive techniques using wires, screens, or crystal collimators, and non-invasive measurements with gas or scattered electrons. Talks on optical methods showed the close links between observing halo and astronomical problems like observing the solar corona or directly observing a planet orbiting another star.

Speaker: Alan Fisher (SLAC)

Slides Thu_105_1100_A_Fisher.pptx

33 IBIC 2014 Scientific Highlights

The SLAC National Accelerator Lab hosted the 3rd International Beam Instrumentation Conference (IBIC 2014) at the Portola Hotel in Monterey, California September 14-18, 2014. The four day scientific program consisted of tutorials, invited talks, contributed talks, poster sessions and industrial sponsor exhibits.

Speaker: Steve Smith (SLAC)

Slides Thu_1130_S_Smith.PPTX

34 IBIC 2016 Update

Speaker: Francis Perez (ALBA)

Slides Presentation_IBIC2016_-_Melbourne.pptx

35 IBIC 2015 Closing Remarks and IBIC 2018 Announcement

Speaker: Dr Mark Boland (Australian Synchrotron)

12:30 Lunch Break - bus to Australian Synchrotron Tour

Bus with lunch box to Australian Synchrotron

Australian Synchrotron Tour

Bus to the city