DIPAC2011 - List of Keywords (kicker)

Paper	Title	Other Keywords	Page
MOPD03	The Beam Safety System of the PSI UCN Source	target, proton, neutron, power-supply	35
	D. Reggiani, B. Blarer, P.-A. Duperrex, G. Dzieglewski, F. Heinrich, A.C. Mezger, U. Rohrer, K. Thomsen, M. Wohlmuther PSI, Villigen, Switzerland
	At PSI, a new and very intensive Ultra-Cold Neutron (UCN) source based on the spallation principle was commissioned in December 2010 and will start production in 2011. From then on, two neutron spallation sources, the continuous wave SINQ and the macro-pulsed UCN source, both furnished with a solid state target, will be operating concurrently at PSI. The 590 MeV, 1.3 MW proton beam will be switched towards the new spallation target for about 8 s every 800 s. Safe operation of the UCN source is guaranteed by two independent interlock systems. In fact, beside the well established accelerator protection system, a new fast interlock system has been designed following the experience gathered with the MEGAPIE (Megawatt Pilot Target Experiment) project. The goal of this additional system is to preserve the UCN target and the complete beam line installation by ensuring correct beam settings and, at the same time, to avoid any accidental release of radioactive material. After a brief introduction of the PSI UCN source, this paper will focus on the motivations as well as the principle of operation of the UCN beam safety system.
	Poster MOPD03 [3.046 MB]

MOPD71	Using the Transverse Digital Damper as a Real-time Tune Monitor for the Booster Synchrotron at Fermilab	booster, damping, controls, synchrotron	209
	N. Eddy, O. Lysenko Fermilab, Batavia, USA
	The Fermilab Booster is a fast ramping (15Hz) synchrotron which accelerates protons from 400MeV to 8GeV. During commissioning of a transverse digital damper system, it was shown that the damper could provide a measurement of the the machine tune throughout the cycle by exciting just 1 of the 84 bunches with minimal impact on the machine operation. The algorithms used to make the measurement have been incorporated into the damper FPGA firmware allowing for real-time tune monitoring of all Booster cycles. Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.

MOPD75	Compact Reconfigurable FPGA Based Beam Current Safety System for UCN	target, controls, monitoring, EPICS	218
	P.-A. Duperrex PSI, Villigen, Switzerland
	At PSI, a new and very intensive Ultra-Cold Neutron (UCN) source based on the spallation principle was commissioned in December 2010 and will start production in 2011. The 590 MeV, 1.3 MW proton beam will be switched towards the new spallation target for about 8 s every 800 s. A beam current monitoring system has been developed as part of a safety system for the UCN source operation. This monitoring system is based on a reconfigurable FPGA system from National Instrument. This paper will present the advantages of such a system compared to analog electronics, its flexibility to future new performance requests and the integration details in the safety control system.

MOPD77	Broadband Digital Feedback System for the VEPP-4M Electron-Positron Collider	feedback, electron, betatron, positron	224
	V.V. Oreshonok, V.V. Smaluk BINP SB RAS, Novosibirsk, Russia V.P. Cherepanov, V.V. Oreshonok, D.P. Sukhanov NSU, Novosibirsk, Russia
	To suppress the transverse instability, which is the main reason of beam current limitation at the VEPP-4M electron-positron collider, a digital bunch-by-bunch feedback system has been developed, installed and commissioned. The real-time data processing is performed by a special code running in an FPGA module. This provides high efficiency and flexibility of the system. During the system commissioning, a 3-times increase of the beam current injected into VEPP-4M was reached. The system design and data processing algorithms are described, the commissioning results are presented.

MOPD80	An FPGA-based Bunch-by-Bunch Position and Angle Feedback System at ATF2	feedback, extraction, linear-collider, collider	233
	G.B. Christian, R. Apsimon, D.R. Bett, B. Constance, M.R. Davis JAI, Oxford, United Kingdom P. Burrows, C. Perry Oxford University, Physics Department, Oxford, Oxon, United Kingdom A. Gerbershagen CERN, Geneva, Switzerland J. Resta-López IFIC, Valencia, Spain
	The FONT5 intra-train feedback system serves as a prototype for an interaction point beam-based feedback system for future electron-positron colliders, such as the International Linear Collider. The system has been tested on the KEK Accelerator Test Facility (ATF) and is deployed to stabilise the beam orbit at the ATF2. The goal of this system is to correct both position and angle jitter in the vertical plane, providing stability of ~1 micron at the entrance to the ATF2 final-focus system. The system comprises three stripline beam position monitors (BPMs) and two stripline kickers, custom low-latency analogue front-end BPM processors, a custom FPGA-based digital processing board with fast ADCs, and custom kicker-drive amplifiers. An overview of the hardware, and the latest results from beam tests at ATF2, will be presented. The total latency of the system with coupled position and angle feedback loops operating simultaneously was measured to be approximately 140 ns. The greatest degree of correction observed was down to a jitter of 0.4 microns at one of the feedback BPMs, a factor of six compared to the uncorrected beam jitter, for a very high degree of bunch-to-bunch correlation.

TUOA02	Diagnostics during the ALBA Storage Ring Commissioning	diagnostics, injection, synchrotron, storage-ring	280
	U. Iriso, M. Alvarez, F.F.B. Fernandez, A. Olmos, F. Pérez CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain
	The ALBA Storage Ring is a 3GeV 3rd Generation Synchrotron Light Source whose 1st phase commissioning took place in Spring 2011. The machine is equipped with 123 BPMs, striplines, several fluorescent screens, FCT and DCCT, 128 BLMs, and two front ends strictly used for electron beam diagnostics (pinhole and streak camera). This paper presents an overview of the Diagnostics elements installed in the machine and our experience during the commissioning.
	Slides TUOA02 [5.476 MB]

TUPD03	Beam Profile Measurement during Top-up Injection with a Pulsed Sextupole Magnet	injection, simulation, quadrupole, dipole	305
	R. Takai, K. Harada, T. Honda, Y. Kobayashi, S. Nagahashi, N. Nakamura, T. Obina, A. Ueda KEK, Ibaraki, Japan H. Takaki ISSP/SRL, Chiba, Japan
	A beam injection scheme using a pulsed multipole magnet is suitable for the top-up injection because a disturbance to the stored beam is much smaller than that of the conventional scheme using several kicker magnets. At the Photon Factory storage ring, the top-up injection with a pulsed sextupole magnet (PSM) has been used for the user operation since January 2011. In order to ascertain the effect of the PSM injection, we measured turn-by-turn stored beam profiles following the injection kick by using a fast-gated camera. As a result, it was demonstrated that the PSM injection dramatically decreases not only the coherent dipole oscillation but also the beam profile modulation, as expected from the beam tracking simulation.

TUPD23	New Bunch-by-Bunch Feedback System for the TLS	feedback, controls, diagnostics, EPICS	353
	C.H. Kuo, Y.K. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu NSRRC, Hsinchu, Taiwan
	FPGA based bunch-by-bunch feedback systems were deployed in 2005-2006 by using SPring-8 designed feedback processors for the Taiwan Light Source. To provide spare units and explore integrate with the control system in the EPICS toolkit environment, feedback processors from the Dimtel were setup. The new system can be swap with the existed system by simple cable re-connection and integrated with the EPICS system in seamless way. Rich functionality except the basic feedback function includes excitation of individual bunch or specifies bunches, averaged spectrum, tune measurement by the feedback dip in the averaged spectrum, fill pattern measurement, etc. are explorer. Current stage implementation and features of the system will summary in this report.

TUPD73	Fast Orbit Stabilization System for Tandem APPLE-II Undulators at the KEK-PF	undulator, controls, power-supply, polarization	479
	T. Obina, K. Harada, R. Takai KEK, Ibaraki, Japan
	A rapid-polarization switching source has been developed in the KEK-PF 2.5-GeV electron storage ring. The source consists of two tandem APPLE-II type elliptically polarizing undulators (EPU) and five fast kicker magnets. The kicker magnets produce a local bump orbit at the frequency up to 100 Hz. Amplitude and phase of these magnets must be tuned precisely in order to minimize the leakage of residual orbit outside of the kicker bump. A fast orbit stabilization system which consists of ADC/FPGA/DAC are also developed to reduce the remaining orbit fluctuations in vertical and horizontal planes. In this paper, design and the preliminary result of the fast orbit compensation system is presented.

TUPD74	The Bunch by Bunch Feedback System in J-PARC Main Ring	feedback, injection, proton, acceleration	482
	Y. Kurimoto, Y.H. Chin, T. Obina, M. Tobiyama, T. Toyama KEK, Ibaraki, Japan Y. Shobuda JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
	We report the current status of the bunch by bunch feedback system for the J-PARC Main Ring. The J-PARC Main Ring is the synchrotron accelerating protons from 3 GeV to 30 GeV. It is normally operating at the intensity of 135 kW. The bunch by bunch feedback system have been developed and used for the normal operation of J-PARC Main Ring. The system aims to reduce the coherent transverse oscillation due to the instabilities or injection errors. It consists of a beam position monitor, a stripline kicker and a signal processing electronics. We've observed the injection error leading to the head-tail oscillation and succeed in damping such kind of oscillations and reducing the beam loss significantly.
	Poster TUPD74 [1.107 MB]

TUPD78	SOLEIL Beam Orbit Stability Improvements	photon, feedback, synchrotron, electron	488
	N. Hubert, L. Cassinari, J.-C. Denard, P. Lebasque, L.S. Nadolski, D. Pédeau SOLEIL, Gif-sur-Yvette, France
	SOLEIL beam orbit stability is being significantly improved. A first effort was set on long term stability for specific beamlines (new 160 m long Nanoscopium and Hard X-rays beamlines). BPM and XBPM steel supports will be replaced for reducing their sensitiveness to temperature drift. Thermal expansion of INVAR and fused Silica stands has been measured. INVAR has been selected for the new BPM supports. A second effort aimed at improving the orbit stability of beamlines based on bending magnets. We plan to use their first XBPM in the global orbit feedback loops (slow and fast). For that purpose new XBPM electronics called Libera photons will be used. Soleil, having contributed to the development, tested extensively the first series. A third effort focused on noise source location. An application developed in-house has identified localized orbit perturbation sources introducing spurious spectrum lines at 46, 50 and 54 Hz on the orbit. They originate from fans rotating close to ceramics chambers of kickers, FCT and shaker. Their suppression decreases the vertical integrated noise down to 300 nm in the DC-500Hz frequency range.

TUPD81	The Petra III Multibunch Feedback System	feedback, cavity, synchrotron, impedance	494
	J. Klute, K. Balewski, A. Delfs, H.T. Duhme, M. Ebert, Ru. Neumann, F. Obier DESY, Hamburg, Germany
	In order to fulfill the demands of a high brilliance synchrotron light source like PETRA III different feedback systems are required. The high brilliance is accomplished by high beam current of 100 mA and very small transverse emittances. The current in PETRA is limited by coupled bunch instabilities to rather low values and powerful longitudinal and transverse feedback systems are necessary to achieve the design current. A careful design of the feedback is required in order to avoid any kind of beam quality degradation such as beam blow up due to noise. Additional requirements on signal processing are: very high dynamic range, adaptive signal adjustment, very high sensitivity to beam oscillations, high resolution and very high bandwidth. This contribution will describe the most important components and their properties. Results of the feedback operation will be presented and discussed. The design current of 100mA has been achieved without the indication of emittance growth and the feedback has been operated reliably during the fast user period.

Paper

Title

Other Keywords

Page

MOPD03

The Beam Safety System of the PSI UCN Source

target, proton, neutron, power-supply

35

D. Reggiani, B. Blarer, P.-A. Duperrex, G. Dzieglewski, F. Heinrich, A.C. Mezger, U. Rohrer, K. Thomsen, M. Wohlmuther
PSI, Villigen, Switzerland

At PSI, a new and very intensive Ultra-Cold Neutron (UCN) source based on the spallation principle was commissioned in December 2010 and will start production in 2011. From then on, two neutron spallation sources, the continuous wave SINQ and the macro-pulsed UCN source, both furnished with a solid state target, will be operating concurrently at PSI. The 590 MeV, 1.3 MW proton beam will be switched towards the new spallation target for about 8 s every 800 s. Safe operation of the UCN source is guaranteed by two independent interlock systems. In fact, beside the well established accelerator protection system, a new fast interlock system has been designed following the experience gathered with the MEGAPIE (Megawatt Pilot Target Experiment) project. The goal of this additional system is to preserve the UCN target and the complete beam line installation by ensuring correct beam settings and, at the same time, to avoid any accidental release of radioactive material. After a brief introduction of the PSI UCN source, this paper will focus on the motivations as well as the principle of operation of the UCN beam safety system.

Poster MOPD03 [3.046 MB]

MOPD71

Using the Transverse Digital Damper as a Real-time Tune Monitor for the Booster Synchrotron at Fermilab

booster, damping, controls, synchrotron

209

N. Eddy, O. Lysenko
Fermilab, Batavia, USA

The Fermilab Booster is a fast ramping (15Hz) synchrotron which accelerates protons from 400MeV to 8GeV. During commissioning of a transverse digital damper system, it was shown that the damper could provide a measurement of the the machine tune throughout the cycle by exciting just 1 of the 84 bunches with minimal impact on the machine operation. The algorithms used to make the measurement have been incorporated into the damper FPGA firmware allowing for real-time tune monitoring of all Booster cycles.
Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.

MOPD75

Compact Reconfigurable FPGA Based Beam Current Safety System for UCN

target, controls, monitoring, EPICS

218

P.-A. Duperrex
PSI, Villigen, Switzerland

At PSI, a new and very intensive Ultra-Cold Neutron (UCN) source based on the spallation principle was commissioned in December 2010 and will start production in 2011. The 590 MeV, 1.3 MW proton beam will be switched towards the new spallation target for about 8 s every 800 s. A beam current monitoring system has been developed as part of a safety system for the UCN source operation. This monitoring system is based on a reconfigurable FPGA system from National Instrument. This paper will present the advantages of such a system compared to analog electronics, its flexibility to future new performance requests and the integration details in the safety control system.

MOPD77

Broadband Digital Feedback System for the VEPP-4M Electron-Positron Collider

feedback, electron, betatron, positron

224

V.V. Oreshonok, V.V. Smaluk
BINP SB RAS, Novosibirsk, Russia
V.P. Cherepanov, V.V. Oreshonok, D.P. Sukhanov
NSU, Novosibirsk, Russia

To suppress the transverse instability, which is the main reason of beam current limitation at the VEPP-4M electron-positron collider, a digital bunch-by-bunch feedback system has been developed, installed and commissioned. The real-time data processing is performed by a special code running in an FPGA module. This provides high efficiency and flexibility of the system. During the system commissioning, a 3-times increase of the beam current injected into VEPP-4M was reached. The system design and data processing algorithms are described, the commissioning results are presented.

MOPD80

An FPGA-based Bunch-by-Bunch Position and Angle Feedback System at ATF2

feedback, extraction, linear-collider, collider

233

G.B. Christian, R. Apsimon, D.R. Bett, B. Constance, M.R. Davis
JAI, Oxford, United Kingdom
P. Burrows, C. Perry
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
A. Gerbershagen
CERN, Geneva, Switzerland
J. Resta-López
IFIC, Valencia, Spain

The FONT5 intra-train feedback system serves as a prototype for an interaction point beam-based feedback system for future electron-positron colliders, such as the International Linear Collider. The system has been tested on the KEK Accelerator Test Facility (ATF) and is deployed to stabilise the beam orbit at the ATF2. The goal of this system is to correct both position and angle jitter in the vertical plane, providing stability of ~1 micron at the entrance to the ATF2 final-focus system. The system comprises three stripline beam position monitors (BPMs) and two stripline kickers, custom low-latency analogue front-end BPM processors, a custom FPGA-based digital processing board with fast ADCs, and custom kicker-drive amplifiers. An overview of the hardware, and the latest results from beam tests at ATF2, will be presented. The total latency of the system with coupled position and angle feedback loops operating simultaneously was measured to be approximately 140 ns. The greatest degree of correction observed was down to a jitter of 0.4 microns at one of the feedback BPMs, a factor of six compared to the uncorrected beam jitter, for a very high degree of bunch-to-bunch correlation.

TUOA02

Diagnostics during the ALBA Storage Ring Commissioning

diagnostics, injection, synchrotron, storage-ring

280

U. Iriso, M. Alvarez, F.F.B. Fernandez, A. Olmos, F. Pérez
CELLS-ALBA Synchrotron, Cerdanyola del Vallès, Spain

The ALBA Storage Ring is a 3GeV 3rd Generation Synchrotron Light Source whose 1st phase commissioning took place in Spring 2011. The machine is equipped with 123 BPMs, striplines, several fluorescent screens, FCT and DCCT, 128 BLMs, and two front ends strictly used for electron beam diagnostics (pinhole and streak camera). This paper presents an overview of the Diagnostics elements installed in the machine and our experience during the commissioning.

Slides TUOA02 [5.476 MB]

TUPD03

Beam Profile Measurement during Top-up Injection with a Pulsed Sextupole Magnet

injection, simulation, quadrupole, dipole

305

R. Takai, K. Harada, T. Honda, Y. Kobayashi, S. Nagahashi, N. Nakamura, T. Obina, A. Ueda
KEK, Ibaraki, Japan
H. Takaki
ISSP/SRL, Chiba, Japan

A beam injection scheme using a pulsed multipole magnet is suitable for the top-up injection because a disturbance to the stored beam is much smaller than that of the conventional scheme using several kicker magnets. At the Photon Factory storage ring, the top-up injection with a pulsed sextupole magnet (PSM) has been used for the user operation since January 2011. In order to ascertain the effect of the PSM injection, we measured turn-by-turn stored beam profiles following the injection kick by using a fast-gated camera. As a result, it was demonstrated that the PSM injection dramatically decreases not only the coherent dipole oscillation but also the beam profile modulation, as expected from the beam tracking simulation.

TUPD23

New Bunch-by-Bunch Feedback System for the TLS

feedback, controls, diagnostics, EPICS

353

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

FPGA based bunch-by-bunch feedback systems were deployed in 2005-2006 by using SPring-8 designed feedback processors for the Taiwan Light Source. To provide spare units and explore integrate with the control system in the EPICS toolkit environment, feedback processors from the Dimtel were setup. The new system can be swap with the existed system by simple cable re-connection and integrated with the EPICS system in seamless way. Rich functionality except the basic feedback function includes excitation of individual bunch or specifies bunches, averaged spectrum, tune measurement by the feedback dip in the averaged spectrum, fill pattern measurement, etc. are explorer. Current stage implementation and features of the system will summary in this report.

TUPD73

Fast Orbit Stabilization System for Tandem APPLE-II Undulators at the KEK-PF

undulator, controls, power-supply, polarization

479

T. Obina, K. Harada, R. Takai
KEK, Ibaraki, Japan

A rapid-polarization switching source has been developed in the KEK-PF 2.5-GeV electron storage ring. The source consists of two tandem APPLE-II type elliptically polarizing undulators (EPU) and five fast kicker magnets. The kicker magnets produce a local bump orbit at the frequency up to 100 Hz. Amplitude and phase of these magnets must be tuned precisely in order to minimize the leakage of residual orbit outside of the kicker bump. A fast orbit stabilization system which consists of ADC/FPGA/DAC are also developed to reduce the remaining orbit fluctuations in vertical and horizontal planes. In this paper, design and the preliminary result of the fast orbit compensation system is presented.

TUPD74

The Bunch by Bunch Feedback System in J-PARC Main Ring

feedback, injection, proton, acceleration

482

Y. Kurimoto, Y.H. Chin, T. Obina, M. Tobiyama, T. Toyama
KEK, Ibaraki, Japan
Y. Shobuda
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan

We report the current status of the bunch by bunch feedback system for the J-PARC Main Ring. The J-PARC Main Ring is the synchrotron accelerating protons from 3 GeV to 30 GeV. It is normally operating at the intensity of 135 kW. The bunch by bunch feedback system have been developed and used for the normal operation of J-PARC Main Ring. The system aims to reduce the coherent transverse oscillation due to the instabilities or injection errors. It consists of a beam position monitor, a stripline kicker and a signal processing electronics. We've observed the injection error leading to the head-tail oscillation and succeed in damping such kind of oscillations and reducing the beam loss significantly.

Poster TUPD74 [1.107 MB]

TUPD78

SOLEIL Beam Orbit Stability Improvements

photon, feedback, synchrotron, electron

488

N. Hubert, L. Cassinari, J.-C. Denard, P. Lebasque, L.S. Nadolski, D. Pédeau
SOLEIL, Gif-sur-Yvette, France

SOLEIL beam orbit stability is being significantly improved. A first effort was set on long term stability for specific beamlines (new 160 m long Nanoscopium and Hard X-rays beamlines). BPM and XBPM steel supports will be replaced for reducing their sensitiveness to temperature drift. Thermal expansion of INVAR and fused Silica stands has been measured. INVAR has been selected for the new BPM supports. A second effort aimed at improving the orbit stability of beamlines based on bending magnets. We plan to use their first XBPM in the global orbit feedback loops (slow and fast). For that purpose new XBPM electronics called Libera photons will be used. Soleil, having contributed to the development, tested extensively the first series. A third effort focused on noise source location. An application developed in-house has identified localized orbit perturbation sources introducing spurious spectrum lines at 46, 50 and 54 Hz on the orbit. They originate from fans rotating close to ceramics chambers of kickers, FCT and shaker. Their suppression decreases the vertical integrated noise down to 300 nm in the DC-500Hz frequency range.

TUPD81

The Petra III Multibunch Feedback System

feedback, cavity, synchrotron, impedance

494

J. Klute, K. Balewski, A. Delfs, H.T. Duhme, M. Ebert, Ru. Neumann, F. Obier
DESY, Hamburg, Germany

In order to fulfill the demands of a high brilliance synchrotron light source like PETRA III different feedback systems are required. The high brilliance is accomplished by high beam current of 100 mA and very small transverse emittances. The current in PETRA is limited by coupled bunch instabilities to rather low values and powerful longitudinal and transverse feedback systems are necessary to achieve the design current. A careful design of the feedback is required in order to avoid any kind of beam quality degradation such as beam blow up due to noise. Additional requirements on signal processing are: very high dynamic range, adaptive signal adjustment, very high sensitivity to beam oscillations, high resolution and very high bandwidth. This contribution will describe the most important components and their properties. Results of the feedback operation will be presented and discussed. The design current of 100mA has been achieved without the indication of emittance growth and the feedback has been operated reliably during the fast user period.