IBIC2012 - List of Keywords (diagnostics)

Paper	Title	Other Keywords	Page
MOPA06	VIMOS, New Capabilities for an Optical Safety System	target, proton, radiation, software	57
	K. Thomsen, J. Devlaminck PSI, Villigen PSI, Switzerland
	VIMOS is a dedicated safety system developed at the Spallation Neutron Source SINQ at the Paul Scherrer Institut, PSI, in Switzerland. VIMOS very directly monitors the correct current density distribution of the proton beam on the target by sampling the light emitted from a glowing mesh heated by the passing protons. The design has been optimized for obtaining maximum sensitivity and timely detection of beam irregularities relying on standard well-proven components. Recently it has been demonstrated that technical boundary conditions like radiation level and signal strength should allow for upgrading the system to a sensitive diagnostic device delivering quantitative and image-resolved values for the proton current density distribution on the SINQ target. By determining the temperature of the glowing mesh from the signals in two separate wavelength bands the temperature distribution over the mesh can be derived und subsequently the incident proton beam current density distribution. Work aimed at investigating the feasibility of adding these diagnostic abilities to VIMOS shows initial promising results. The status of the project and preliminary findings will be reported.

MOPA10	Diamond Detectors for LHC	detector, beam-losses, injection, instrumentation	71
	E. Griesmayer, P. Kavrigin CIVIDEC Instrumentation, Wien, Austria T. Baer, B. Dehning, D. Dobos, E. Effinger, H. Pernegger CERN, Geneva, Switzerland M. Hempel BTU, Cottbus, Germany
	Funding: CIVIDEC Instrumentation GmbH Diamond detectors are installed at the LHC as fast beam loss monitors. Their excellent time resolution make them a useful beam diagnostic tool for bunch-to-bunch beam loss observations, which is essential for the understanding of fast beam loss scenarios at the LHC.

MOPB52	Status and Activities of the SPring-8 Diagnostics Beamlines	photon, optics, storage-ring, emittance	186
	S. Takano, M. Masaki, A. Mochihashi, H. Ohkuma, M. Shoji, K. Tamura JASRI/SPring-8, Hyogo-ken, Japan H. Sumitomo, M. Yoshioka SES, Hyogo-pref., Japan
	At SPring-8 synchrotron radiation (SR) in both the X-ray and the visible bands is exploited in the two diagnostics beamlines. The diagnostics I beamline has a dipole magnet source. The beam size is measured by imaging with the zoneplate X-ray optics. Recently, the transfer line of the visible light has been upgraded. The in-vacuum mirror was replaced to increase the acceptance of the visible photons. A new dark room was built and dedicated to the gated photon counting system for bunch purity monitoring. To improve the performance, the input optics of the visible streak camera was replaced by a reflective optics. Study of the power fluctuation of visible SR pulse is in progress to develop a diagnostic method of short bunch length. The diagnostics II has an insertion device (ID). To monitor stabilities of the ID photon beam, a position monitor for the white X-ray beam based on a CVD diamond screen was installed. A turn-by-turn diagnostics system using the monochromatic X-ray beam was developed to observe fast phenomena such as beam oscillation at injection for top-up and beam blowups caused by instabilities. Study of temporal resolution of the X-ray streak camera is also in progress.

MOPB60	Beam Diagnostics for AREAL RF Photogun Linac	linac, gun, electron, emittance	212
	K. Manukyan, G.A. Amatuni, B. Grigoryan, V. Sahakyan, A. Sargsyan, G.S. Zanyan CANDLE, Yerevan, Armenia
	Advanced Research Electron Accelerator Laboratory (AREAL) based on photocathode RF gun is under construction at CANDLE. The basic approach to the new facility is the photocathode S-band RF electron gun followed by two 1 m long S-band travelling wave accelerating sections. Linac will operate in single bunch mode with final beam energy up to 20 MeV and the bunch charge 10 - 200 pC. In this paper the main approaches and characteristics of transverse and longitudinal beam diagnostics are presented.

TUPA01	Diagnostics Update of the Taiwan Photon Source	feedback, storage-ring, booster, synchrotron	324
	C.H. Kuo, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, S.Y. Hsu, K.H. Hu, C.Y. Liao, C.Y. Wu NSRRC, Hsinchu, Taiwan
	Taiwan Photon Source (TPS) is a 3 GeV synchrotron light source which is being construction at campus of NSRRC. Various diagnostics are in implementation and will deploy in the future to satisfy stringent requirements of TPS for commissioning, top-up injection, and operation. These designs include beam intensity observation, trajectory and beam positions measurement, destructive profile measurement, synchrotron radiation monitors, beam loss monitors, orbit and bunch-by-bunch feedbacks, filling pattern and etc. are in final design phase. Progress of construction of the planned beam instrumentation system for the TPS will be summarized in this report.

TUPA18	Development of the Beam Position Monitors for the SPIRAL2 Linac	linac, quadrupole, operation, cryomodule	374
	M. Ben Abdillah, P. Ausset, G. Belot, P. Blache, P. Dambre, J. Lesrel, E. Marius IPN, Orsay, France
	Funding: CNRS (Centre National de la Recherche Scientifique) CEA (Commissariat à l'Energie Atomique); Région Basse Normandie Co-Authors: P. Ausset, J. Lesrel, P. Blache, P. Dambre, G. Belot, E. Marius The SPIRAL 2 facility will be able to deliver stable heavy ion beams and deuteron beams at very high intensity, producing and accelerating light and heavy rare ion beams. The driver will accelerate between 0.15mA and 5 mA deuteron beam up to 20 MeV/u and also q/A=1/3 heavy ions up to 14.5 MeV/u. The accurate tuning of the LINAC is essential for the operation of SPIRAL2 and requires from the Beam Position Monitor (BPM) system the measurements of the beam transverse position, the phase of the beam with respect to the radiofrequency voltage and the beam energy. Twenty three BPM were realized for SPIRAL2. This paper addresses all aspects of the design, realization, and calibration of these BPM, while emphasizing the determination of the beam position and shape. The measurements on the BPM are carried out on a test bench in the laboratory: the position mapping with a resolution of 50 μm is performed and the sensitivity to the beam displacement is about 1.36dB/mm at the centre of the BPM. The characterization of the beam shape is performed by means of a special test bench configuration. An overview of the electronics under realization for the BPM of the SPIRAL2 Linac is given. Keywords: BPM, SPIRAL2, position mapping , sensitivity References: P. Ausset « Overview of the beam diagnostics for the driver of SPIRAL 2» R.H.Miller « Nonintercepting Emittance Monitor »

TUPA29	Implementation of an FPGA Based System Survey and Diagnostic Reader with the Aim to Increase the System Dependability	interface, monitoring, survey, FPGA	409
	M. Alsdorf, B. Dehning, M. Kwiatkowski, W. Viganò, C. Zamantzas CERN, Geneva, Switzerland
	The operation and machine protection of accelerators practically rely on their underlying instrumentation systems and a failure of any of those systems could pose a significant impact on the overall reliability and availability. In order to improve the detection and in some cases the prevention of failures, a survey mechanism could be integrated to the system that collects crucial information about the current system status through a number of acquisition modules. The implementation and integration of such a method is presented with the aim to standardize the implementation, where the acquisition modules share a common build and are connected through a standardized interface to a survey reader. The reader collects regularly data and controls the readout intervals. The information collected from these modules is used locally in the FPGA device to identify critical system failures and results in an immediate failsafe reaction with the data also transmitted and stored in external databases for offline analysis.

TUPA47	Middle-infrared Prism Spectrometer for Single-shot Bunch Length Diagnostics at the LCLS	detector, laser, optics, radiation	463
	T.J. Maxwell, Y. Ding, A.S. Fisher, J.C. Frisch, H. Loos SLAC, Menlo Park, California, USA C. Behrens DESY, Hamburg, Germany
	Funding: Work supported in part by US Department of Energy contract number DE-AC02-76SF00515. Modern high-brightness accelerators such as laser plasma wakefield and free-electron lasers continue the drive to ever-shorter bunches. At low-charge (< 20 pC), bunches as short as 10 fs are reported at the Linac Coherent Light Source (LCLS). Advanced time-resolved diagnostics approaching the fs-level have been proposed requiring the support of rf-deflectors, modern laser systems, or other complex systems. Though suffering from a loss of phase information, spectral diagnostics remain appealing by comparison as compact, low-cost systems suitable for deployment in beam dynamics studies and operations instrumentation. Progress in mid-IR imaging and detection of the corresponding micrometer-range power spectrum has led to the continuing development of a single-shot, 1.2 - 40 micrometer prism spectrometer for ultra-short bunch length monitoring. In this paper we report further analysis and experimental progress on the spectrometer installation at LCLS.

TUPB51	Gatling Gun Test Stand Instrumentation	electron, gun, cathode, emittance	474
	D.M. Gassner, I. Ben-Zvi, J.C. Brutus, C. Liu, M.G. Minty, A.I. Pikin, O.H. Rahman, E.J. Riehn, J. Skaritka, E. Wang BNL, Upton, Long Island, New York, USA
	In order to reach the design eRHIC luminosity 50mA of polarized electron current is needed. This is far beyond what the present state-of-the-art polarized electron cathode can deliver. A high average polarized current injector based on the Gatling Gun principle is being designed. This technique will employ multiple cathodes and combine their multiple bunched beams along the same axis. A proof-of-principle test bench will be constructed that includes a 220 keV Gatling Gun, beam combiner, diagnostics station, and collector. The challenges for the instrumentation systems and the beam diagnostics that will measure current, profile, position, and halo will be described.

TUPB63	Development of Turn-by-turn Beam Diagnostic System using Undulator Radiation	radiation, injection, undulator, timing	492
	M. Masaki, A. Mochihashi, H. Ohkuma, S. Takano, K. Tamura JASRI/SPring-8, Hyogo-ken, Japan
	At the diagnostic beamline II (BL05SS) of the SPring-8 storage ring, a turn-by-turn beam diagnostic system using undulator radiation has been developed to observe fast phenomena such as stored beam oscillations during the top-up injections, blowups of beam size and energy spread coming from the instabilities of a high current single bunch and so on. The fast diagnostic system observes a spatial profile of the undulator radiation on a selected harmonic number. Especially, the higher harmonic radiations than the 10th-order are sensitive to the energy spread. A fluorescence screen (YAG:Ce) with afterglow of several tens of nano-second converts the radiation profile into visible light image. The imaging optics makes the horizontal and vertical profiles as two line images by one-dimensional focusing using cylindrical lenses. A fast-gated CCD camera with image intensifier simultaneously captures the two line images. The kinetics readout mode of the fast CCD camera is used to register the spatial profiles of several tens of turns in one flame. The principle and experimental setup of the turn-by-turn diagnostic system, and examples of beam observations will be presented.

WEIB01	Overview of ESS Beam Diagnostics	linac, target, quadrupole, detector	543
	A. Jansson, C. Böhme, B. Cheymol, H. Hassanzadegan, M. Jarosz, T.J. Shea, L. Tchelidze ESS, Lund, Sweden
	The European Spallation Source (ESS) will use a 2.5GeV superconducting proton linac with a 5MW average beam power to produce the worlds most powerful neutron source. The project, sited in the south of Sweden, is approaching the end of the pre-construction phase, and is expected to enter the construction phase in 2013. This paper gives an overview of the ESS accelerator and the planned beam diagnostics systems, as well as the associated challenges.
	Slides WEIB01 [6.123 MB]

WECC01	IFMIF-LIPAc Diagnostics and its Challenges	neutron, rfq, linac, radiation	557
	J. Marroncle, P. Abbon, J.F. Denis, J. Egberts, J.-F. Gournay, F. Jeanneau, A. Marchix, J.-Ph. Mols, T. Papaevangelou CEA/IRFU, Gif-sur-Yvette, France J.C. Calvo, J.M. Carmona, P. Fernández, A. Guirao, D. Iglesias, C. Oliver, I. Podadera, A. Soleto CIEMAT, Madrid, Spain M. Poggi INFN/LNL, Legnaro (PD), Italy M. Pomorski CEA/DRT/LIST, Gif-sur-Yvette Cedex, France
	The International Fusion Materials Irradiation Facility (IFMIF) aims at providing a very intense neutron source (10¹⁷ neutron/s) to test the structure materials for the future fusion reactors, beyond ITER (International Thermonuclear Experimental Reactor). Such a source will be driven using 2 deuteron accelerators 125 mA cw up to 40 MeV impinging into a lithium liquid curtain, thus producing very high neutron flux with a similar spectrum as those expected in fusion reactors. A validation phase was decided for this 10 MW facility consisting partly in the design of the prototype accelerator LIPAc (Linear IFMIF Prototype Accelerator). LIPAc, which is in design phase, will accelerate a 125 mA cw beam deuteron up to the first superconductive linac module (4 for IFMIF). The 9 MeV beam will be driven through a HEBT to beam dump. This facility is currently under construction at Rokkasho (Japan). We propose to describe the beam diagnostics foreseen for this 1.125 MW accelerator emphasizing the challenges encountered and the overcome solutions, if any.
	Slides WECC01 [14.988 MB]

WECC03	Intensity Imbalance Optical Interferometer Beam Size Monitor	synchrotron, coupling, storage-ring, damping	566
	M.J. Boland ASCo, Clayton, Victoria, Australia T.M. Mitsuhashi, T. Naito KEK, Ibaraki, Japan K.P. Wootton The University of Melbourne, Melbourne, Australia
	The technique of measuring the beam size in a particle accelerator with an optical interferometer with the Mitsuhashi apparatus is well established and one of the only direct measurement techniques available. However, one of the limitations of the technique is the dynamic range and noise level of CCD cameras when measuring ultra low emittance beams and hence visibilities close to unity. A new design has been successfully tested to overcome these limitations by introducing a know intensity imbalance in one of the light paths of the interferometer. This modification reduces the visibility in a controlled way and lifts the measured interference pattern out of the noise level of the CCD, thus increasing the dynamic range of the apparatus. Results are presented from tests at the ATF2 at KEK and on the optical diagnostic beamline at the Australian Synchrotron storage ring.
	Slides WECC03 [2.383 MB]

Paper

Title

Other Keywords

Page

MOPA06

VIMOS, New Capabilities for an Optical Safety System

target, proton, radiation, software

57

K. Thomsen, J. Devlaminck
PSI, Villigen PSI, Switzerland

VIMOS is a dedicated safety system developed at the Spallation Neutron Source SINQ at the Paul Scherrer Institut, PSI, in Switzerland. VIMOS very directly monitors the correct current density distribution of the proton beam on the target by sampling the light emitted from a glowing mesh heated by the passing protons. The design has been optimized for obtaining maximum sensitivity and timely detection of beam irregularities relying on standard well-proven components. Recently it has been demonstrated that technical boundary conditions like radiation level and signal strength should allow for upgrading the system to a sensitive diagnostic device delivering quantitative and image-resolved values for the proton current density distribution on the SINQ target. By determining the temperature of the glowing mesh from the signals in two separate wavelength bands the temperature distribution over the mesh can be derived und subsequently the incident proton beam current density distribution. Work aimed at investigating the feasibility of adding these diagnostic abilities to VIMOS shows initial promising results. The status of the project and preliminary findings will be reported.

MOPA10

Diamond Detectors for LHC

detector, beam-losses, injection, instrumentation

71

E. Griesmayer, P. Kavrigin
CIVIDEC Instrumentation, Wien, Austria
T. Baer, B. Dehning, D. Dobos, E. Effinger, H. Pernegger
CERN, Geneva, Switzerland
M. Hempel
BTU, Cottbus, Germany

Funding: CIVIDEC Instrumentation GmbH
Diamond detectors are installed at the LHC as fast beam loss monitors. Their excellent time resolution make them a useful beam diagnostic tool for bunch-to-bunch beam loss observations, which is essential for the understanding of fast beam loss scenarios at the LHC.

MOPB52

Status and Activities of the SPring-8 Diagnostics Beamlines

photon, optics, storage-ring, emittance

186

S. Takano, M. Masaki, A. Mochihashi, H. Ohkuma, M. Shoji, K. Tamura
JASRI/SPring-8, Hyogo-ken, Japan
H. Sumitomo, M. Yoshioka
SES, Hyogo-pref., Japan

At SPring-8 synchrotron radiation (SR) in both the X-ray and the visible bands is exploited in the two diagnostics beamlines. The diagnostics I beamline has a dipole magnet source. The beam size is measured by imaging with the zoneplate X-ray optics. Recently, the transfer line of the visible light has been upgraded. The in-vacuum mirror was replaced to increase the acceptance of the visible photons. A new dark room was built and dedicated to the gated photon counting system for bunch purity monitoring. To improve the performance, the input optics of the visible streak camera was replaced by a reflective optics. Study of the power fluctuation of visible SR pulse is in progress to develop a diagnostic method of short bunch length. The diagnostics II has an insertion device (ID). To monitor stabilities of the ID photon beam, a position monitor for the white X-ray beam based on a CVD diamond screen was installed. A turn-by-turn diagnostics system using the monochromatic X-ray beam was developed to observe fast phenomena such as beam oscillation at injection for top-up and beam blowups caused by instabilities. Study of temporal resolution of the X-ray streak camera is also in progress.

MOPB60

Beam Diagnostics for AREAL RF Photogun Linac

linac, gun, electron, emittance

212

K. Manukyan, G.A. Amatuni, B. Grigoryan, V. Sahakyan, A. Sargsyan, G.S. Zanyan
CANDLE, Yerevan, Armenia

Advanced Research Electron Accelerator Laboratory (AREAL) based on photocathode RF gun is under construction at CANDLE. The basic approach to the new facility is the photocathode S-band RF electron gun followed by two 1 m long S-band travelling wave accelerating sections. Linac will operate in single bunch mode with final beam energy up to 20 MeV and the bunch charge 10 - 200 pC. In this paper the main approaches and characteristics of transverse and longitudinal beam diagnostics are presented.

TUPA01

Diagnostics Update of the Taiwan Photon Source

feedback, storage-ring, booster, synchrotron

324

C.H. Kuo, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, S.Y. Hsu, K.H. Hu, C.Y. Liao, C.Y. Wu
NSRRC, Hsinchu, Taiwan

Taiwan Photon Source (TPS) is a 3 GeV synchrotron light source which is being construction at campus of NSRRC. Various diagnostics are in implementation and will deploy in the future to satisfy stringent requirements of TPS for commissioning, top-up injection, and operation. These designs include beam intensity observation, trajectory and beam positions measurement, destructive profile measurement, synchrotron radiation monitors, beam loss monitors, orbit and bunch-by-bunch feedbacks, filling pattern and etc. are in final design phase. Progress of construction of the planned beam instrumentation system for the TPS will be summarized in this report.

TUPA18

Development of the Beam Position Monitors for the SPIRAL2 Linac

linac, quadrupole, operation, cryomodule

374

M. Ben Abdillah, P. Ausset, G. Belot, P. Blache, P. Dambre, J. Lesrel, E. Marius
IPN, Orsay, France

Funding: CNRS (Centre National de la Recherche Scientifique) CEA (Commissariat à l'Energie Atomique); Région Basse Normandie Co-Authors: P. Ausset, J. Lesrel, P. Blache, P. Dambre, G. Belot, E. Marius
The SPIRAL 2 facility will be able to deliver stable heavy ion beams and deuteron beams at very high intensity, producing and accelerating light and heavy rare ion beams. The driver will accelerate between 0.15mA and 5 mA deuteron beam up to 20 MeV/u and also q/A=1/3 heavy ions up to 14.5 MeV/u. The accurate tuning of the LINAC is essential for the operation of SPIRAL2 and requires from the Beam Position Monitor (BPM) system the measurements of the beam transverse position, the phase of the beam with respect to the radiofrequency voltage and the beam energy. Twenty three BPM were realized for SPIRAL2. This paper addresses all aspects of the design, realization, and calibration of these BPM, while emphasizing the determination of the beam position and shape. The measurements on the BPM are carried out on a test bench in the laboratory: the position mapping with a resolution of 50 μm is performed and the sensitivity to the beam displacement is about 1.36dB/mm at the centre of the BPM. The characterization of the beam shape is performed by means of a special test bench configuration. An overview of the electronics under realization for the BPM of the SPIRAL2 Linac is given.
Keywords: BPM, SPIRAL2, position mapping , sensitivity
References:
*P. Ausset « Overview of the beam diagnostics for the driver of SPIRAL 2»
*R.H.Miller « Nonintercepting Emittance Monitor »

TUPA29

Implementation of an FPGA Based System Survey and Diagnostic Reader with the Aim to Increase the System Dependability

interface, monitoring, survey, FPGA

409

M. Alsdorf, B. Dehning, M. Kwiatkowski, W. Viganò, C. Zamantzas
CERN, Geneva, Switzerland

The operation and machine protection of accelerators practically rely on their underlying instrumentation systems and a failure of any of those systems could pose a significant impact on the overall reliability and availability. In order to improve the detection and in some cases the prevention of failures, a survey mechanism could be integrated to the system that collects crucial information about the current system status through a number of acquisition modules. The implementation and integration of such a method is presented with the aim to standardize the implementation, where the acquisition modules share a common build and are connected through a standardized interface to a survey reader. The reader collects regularly data and controls the readout intervals. The information collected from these modules is used locally in the FPGA device to identify critical system failures and results in an immediate failsafe reaction with the data also transmitted and stored in external databases for offline analysis.

TUPA47

Middle-infrared Prism Spectrometer for Single-shot Bunch Length Diagnostics at the LCLS

detector, laser, optics, radiation

463

T.J. Maxwell, Y. Ding, A.S. Fisher, J.C. Frisch, H. Loos
SLAC, Menlo Park, California, USA
C. Behrens
DESY, Hamburg, Germany

Funding: Work supported in part by US Department of Energy contract number DE-AC02-76SF00515.
Modern high-brightness accelerators such as laser plasma wakefield and free-electron lasers continue the drive to ever-shorter bunches. At low-charge (< 20 pC), bunches as short as 10 fs are reported at the Linac Coherent Light Source (LCLS). Advanced time-resolved diagnostics approaching the fs-level have been proposed requiring the support of rf-deflectors, modern laser systems, or other complex systems. Though suffering from a loss of phase information, spectral diagnostics remain appealing by comparison as compact, low-cost systems suitable for deployment in beam dynamics studies and operations instrumentation. Progress in mid-IR imaging and detection of the corresponding micrometer-range power spectrum has led to the continuing development of a single-shot, 1.2 - 40 micrometer prism spectrometer for ultra-short bunch length monitoring. In this paper we report further analysis and experimental progress on the spectrometer installation at LCLS.

TUPB51

Gatling Gun Test Stand Instrumentation

electron, gun, cathode, emittance

474

D.M. Gassner, I. Ben-Zvi, J.C. Brutus, C. Liu, M.G. Minty, A.I. Pikin, O.H. Rahman, E.J. Riehn, J. Skaritka, E. Wang
BNL, Upton, Long Island, New York, USA

In order to reach the design eRHIC luminosity 50mA of polarized electron current is needed. This is far beyond what the present state-of-the-art polarized electron cathode can deliver. A high average polarized current injector based on the Gatling Gun principle is being designed. This technique will employ multiple cathodes and combine their multiple bunched beams along the same axis. A proof-of-principle test bench will be constructed that includes a 220 keV Gatling Gun, beam combiner, diagnostics station, and collector. The challenges for the instrumentation systems and the beam diagnostics that will measure current, profile, position, and halo will be described.

TUPB63

Development of Turn-by-turn Beam Diagnostic System using Undulator Radiation

radiation, injection, undulator, timing

492

M. Masaki, A. Mochihashi, H. Ohkuma, S. Takano, K. Tamura
JASRI/SPring-8, Hyogo-ken, Japan

At the diagnostic beamline II (BL05SS) of the SPring-8 storage ring, a turn-by-turn beam diagnostic system using undulator radiation has been developed to observe fast phenomena such as stored beam oscillations during the top-up injections, blowups of beam size and energy spread coming from the instabilities of a high current single bunch and so on. The fast diagnostic system observes a spatial profile of the undulator radiation on a selected harmonic number. Especially, the higher harmonic radiations than the 10th-order are sensitive to the energy spread. A fluorescence screen (YAG:Ce) with afterglow of several tens of nano-second converts the radiation profile into visible light image. The imaging optics makes the horizontal and vertical profiles as two line images by one-dimensional focusing using cylindrical lenses. A fast-gated CCD camera with image intensifier simultaneously captures the two line images. The kinetics readout mode of the fast CCD camera is used to register the spatial profiles of several tens of turns in one flame. The principle and experimental setup of the turn-by-turn diagnostic system, and examples of beam observations will be presented.

WEIB01

Overview of ESS Beam Diagnostics

linac, target, quadrupole, detector

543

A. Jansson, C. Böhme, B. Cheymol, H. Hassanzadegan, M. Jarosz, T.J. Shea, L. Tchelidze
ESS, Lund, Sweden

The European Spallation Source (ESS) will use a 2.5GeV superconducting proton linac with a 5MW average beam power to produce the worlds most powerful neutron source. The project, sited in the south of Sweden, is approaching the end of the pre-construction phase, and is expected to enter the construction phase in 2013. This paper gives an overview of the ESS accelerator and the planned beam diagnostics systems, as well as the associated challenges.

Slides WEIB01 [6.123 MB]

WECC01

IFMIF-LIPAc Diagnostics and its Challenges

neutron, rfq, linac, radiation

557

J. Marroncle, P. Abbon, J.F. Denis, J. Egberts, J.-F. Gournay, F. Jeanneau, A. Marchix, J.-Ph. Mols, T. Papaevangelou
CEA/IRFU, Gif-sur-Yvette, France
J.C. Calvo, J.M. Carmona, P. Fernández, A. Guirao, D. Iglesias, C. Oliver, I. Podadera, A. Soleto
CIEMAT, Madrid, Spain
M. Poggi
INFN/LNL, Legnaro (PD), Italy
M. Pomorski
CEA/DRT/LIST, Gif-sur-Yvette Cedex, France

The International Fusion Materials Irradiation Facility (IFMIF) aims at providing a very intense neutron source (10¹⁷ neutron/s) to test the structure materials for the future fusion reactors, beyond ITER (International Thermonuclear Experimental Reactor). Such a source will be driven using 2 deuteron accelerators 125 mA cw up to 40 MeV impinging into a lithium liquid curtain, thus producing very high neutron flux with a similar spectrum as those expected in fusion reactors. A validation phase was decided for this 10 MW facility consisting partly in the design of the prototype accelerator LIPAc (Linear IFMIF Prototype Accelerator). LIPAc, which is in design phase, will accelerate a 125 mA cw beam deuteron up to the first superconductive linac module (4 for IFMIF). The 9 MeV beam will be driven through a HEBT to beam dump. This facility is currently under construction at Rokkasho (Japan). We propose to describe the beam diagnostics foreseen for this 1.125 MW accelerator emphasizing the challenges encountered and the overcome solutions, if any.

Slides WECC01 [14.988 MB]

WECC03

Intensity Imbalance Optical Interferometer Beam Size Monitor

synchrotron, coupling, storage-ring, damping

566

M.J. Boland
ASCo, Clayton, Victoria, Australia
T.M. Mitsuhashi, T. Naito
KEK, Ibaraki, Japan
K.P. Wootton
The University of Melbourne, Melbourne, Australia

The technique of measuring the beam size in a particle accelerator with an optical interferometer with the Mitsuhashi apparatus is well established and one of the only direct measurement techniques available. However, one of the limitations of the technique is the dynamic range and noise level of CCD cameras when measuring ultra low emittance beams and hence visibilities close to unity. A new design has been successfully tested to overcome these limitations by introducing a know intensity imbalance in one of the light paths of the interferometer. This modification reduces the visibility in a controlled way and lifts the measured interference pattern out of the noise level of the CCD, thus increasing the dynamic range of the apparatus. Results are presented from tests at the ATF2 at KEK and on the optical diagnostic beamline at the Australian Synchrotron storage ring.

Slides WECC03 [2.383 MB]