IPAC2013 - List of Authors (Gerbershagen, A.)

Paper

Title

Page

The Drive Beam Phase Stability in CTF3 and its Relation to the Bunch Compression Factor

1655

E. Ikarios, A. Andersson, J. Barranco, B. Constance, R. Corsini, A. Gerbershagen, T. Persson, P. Skowroński, F. Tecker
CERN, Geneva, Switzerland

The proposed Compact Linear Collider (CLIC) is based on a two-beam acceleration scheme. The energy needed to accelerate a low intensity "main" beam is provided by a high intensity, low energy "drive" beam. The precision and stability of the phase relation between two beams is crucial for the performance of the scheme. The tolerable phase jitter is 0.2 deg rms at 12GHz. For this reason it is fundamental to understand the main possible causes of the drive beam timing jitter. Experimental work aimed at such understanding was done in the CLIC Test Facility (CTF3) where a drive beam with characteristics similar to the CLIC one is produced. Several phase measurements allowed us to conclude that the main source of phase jitter is energy jitter of the beam transformed and amplified into phase jitter when passing through a magnetic chicane. This conclusion is supported by measurements done with different momentum compaction values in the chicane. In this paper the results of these several phase measurements will be presented and compared with expectations.

WEOBB203

Design of Phase Feed Forward System in CTF3 and Performance of Fast Beam Phase Monitors

2097

P. Skowroński, A. Andersson, A. Gerbershagen, E. Ikarios, J. Roberts
CERN, Geneva, Switzerland
P. Burrows, G.B. Christian, A. Gerbershagen, C. Perry, J. Roberts
JAI, Oxford, United Kingdom
P. Burrows, G.B. Christian, A. Gerbershagen, C. Perry
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
A. Ghigo, F. Marcellini
INFN/LNF, Frascati (Roma), Italy
E. Ikarios
National Technical University of Athens, Athens, Greece

Funding: Work supported by the European Commission under the FP7 Research Infrastructures project Eu- CARD, grant agreement no. 227579
The CLIC two beam acceleration technology requires a drive beam phase stability of better than 0.3 deg rms at 12 GHz, corresponding to a timing stability below 50 fs rms. For this reason the CLIC design includes a phase stabilization feed-forward system. It relies on precise beam phase measurement and its subsequent correction in a chicane with help of fast kickers. A prototype of such a system is being installed in CLIC Test Facility CTF3. In this paper we describe in detail its design and implementation. Additionally, we present and discuss the performance of the precision phase monitor prototypes installed at the end of the CTF3 linac, measured with the drive beam.
We would like to acknowledge support of G.Sensolini, A.Zolla (INFN/LNF Frascati), N.S.Chritin and J-M.Scigliuto (CERN) in design and fabrication of components.

Slides WEOBB203 [6.770 MB]

WEPME053

Latest Performance Results from the FONT 5 Intra Train Beam Position Feedback System at ATF

3049

M.R. Davis, D.R. Bett, N. Blaskovic Kraljevic, P. Burrows, G.B. Christian, Y.I. Kim, C. Perry
JAI, Oxford, United Kingdom
R. Apsimon, B. Constance, A. Gerbershagen
CERN, Geneva, Switzerland

A prototype ultra-fast beam-based feedback system for deployment in single-pass beamlines, such as a future lepton collider (ILC or CLIC) or a free-electron laser, has been fabricated and is being tested in the extraction and final focus lines of the Accelerator Test Facility (ATF) at KEK. FONT5 is an intra-train feedback system for stabilising the beam orbit via different methods: a position and angle feedback correction in the extraction line or a vertical feedforward correction applied at the interaction point (IP) . Two systems comprise three stripline beam position monitors (BPMs) and two stripline kickers in the extraction line, two cavity BPMs and a stripline kicker at the IP, a custom FPGA-based digital processing board, custom kicker-drive amplifiers and low-latency analogue front-end BPM processors. Latest results from the experiment are presented. These include beam position correction in the extraction line, as well as preliminary results of beam correction at the IP.

WEOBB203

Design of Phase Feed Forward System in CTF3 and Performance of Fast Beam Phase Monitors

2097

P. Skowroński, A. Andersson, A. Gerbershagen, E. Ikarios, J. Roberts
CERN, Geneva, Switzerland
P. Burrows, G.B. Christian, A. Gerbershagen, C. Perry, J. Roberts
JAI, Oxford, United Kingdom
P. Burrows, G.B. Christian, A. Gerbershagen, C. Perry
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
A. Ghigo, F. Marcellini
INFN/LNF, Frascati (Roma), Italy
E. Ikarios
National Technical University of Athens, Athens, Greece

Funding: Work supported by the European Commission under the FP7 Research Infrastructures project Eu- CARD, grant agreement no. 227579
The CLIC two beam acceleration technology requires a drive beam phase stability of better than 0.3 deg rms at 12 GHz, corresponding to a timing stability below 50 fs rms. For this reason the CLIC design includes a phase stabilization feed-forward system. It relies on precise beam phase measurement and its subsequent correction in a chicane with help of fast kickers. A prototype of such a system is being installed in CLIC Test Facility CTF3. In this paper we describe in detail its design and implementation. Additionally, we present and discuss the performance of the precision phase monitor prototypes installed at the end of the CTF3 linac, measured with the drive beam.
We would like to acknowledge support of G.Sensolini, A.Zolla (INFN/LNF Frascati), N.S.Chritin and J-M.Scigliuto (CERN) in design and fabrication of components.

Slides WEOBB203 [6.770 MB]

WEOBB203

Design of Phase Feed Forward System in CTF3 and Performance of Fast Beam Phase Monitors

2097

P. Skowroński, A. Andersson, A. Gerbershagen, E. Ikarios, J. Roberts
CERN, Geneva, Switzerland
P. Burrows, G.B. Christian, A. Gerbershagen, C. Perry, J. Roberts
JAI, Oxford, United Kingdom
P. Burrows, G.B. Christian, A. Gerbershagen, C. Perry
Oxford University, Physics Department, Oxford, Oxon, United Kingdom
A. Ghigo, F. Marcellini
INFN/LNF, Frascati (Roma), Italy
E. Ikarios
National Technical University of Athens, Athens, Greece

Funding: Work supported by the European Commission under the FP7 Research Infrastructures project Eu- CARD, grant agreement no. 227579
The CLIC two beam acceleration technology requires a drive beam phase stability of better than 0.3 deg rms at 12 GHz, corresponding to a timing stability below 50 fs rms. For this reason the CLIC design includes a phase stabilization feed-forward system. It relies on precise beam phase measurement and its subsequent correction in a chicane with help of fast kickers. A prototype of such a system is being installed in CLIC Test Facility CTF3. In this paper we describe in detail its design and implementation. Additionally, we present and discuss the performance of the precision phase monitor prototypes installed at the end of the CTF3 linac, measured with the drive beam.
We would like to acknowledge support of G.Sensolini, A.Zolla (INFN/LNF Frascati), N.S.Chritin and J-M.Scigliuto (CERN) in design and fabrication of components.

Slides WEOBB203 [6.770 MB]

Paper	Title	Page
TUPME039	The Drive Beam Phase Stability in CTF3 and its Relation to the Bunch Compression Factor	1655
	E. Ikarios, A. Andersson, J. Barranco, B. Constance, R. Corsini, A. Gerbershagen, T. Persson, P. Skowroński, F. Tecker CERN, Geneva, Switzerland
	The proposed Compact Linear Collider (CLIC) is based on a two-beam acceleration scheme. The energy needed to accelerate a low intensity "main" beam is provided by a high intensity, low energy "drive" beam. The precision and stability of the phase relation between two beams is crucial for the performance of the scheme. The tolerable phase jitter is 0.2 deg rms at 12GHz. For this reason it is fundamental to understand the main possible causes of the drive beam timing jitter. Experimental work aimed at such understanding was done in the CLIC Test Facility (CTF3) where a drive beam with characteristics similar to the CLIC one is produced. Several phase measurements allowed us to conclude that the main source of phase jitter is energy jitter of the beam transformed and amplified into phase jitter when passing through a magnetic chicane. This conclusion is supported by measurements done with different momentum compaction values in the chicane. In this paper the results of these several phase measurements will be presented and compared with expectations.

WEOBB203	Design of Phase Feed Forward System in CTF3 and Performance of Fast Beam Phase Monitors	2097
	P. Skowroński, A. Andersson, A. Gerbershagen, E. Ikarios, J. Roberts CERN, Geneva, Switzerland P. Burrows, G.B. Christian, A. Gerbershagen, C. Perry, J. Roberts JAI, Oxford, United Kingdom P. Burrows, G.B. Christian, A. Gerbershagen, C. Perry Oxford University, Physics Department, Oxford, Oxon, United Kingdom A. Ghigo, F. Marcellini INFN/LNF, Frascati (Roma), Italy E. Ikarios National Technical University of Athens, Athens, Greece
	Funding: Work supported by the European Commission under the FP7 Research Infrastructures project Eu- CARD, grant agreement no. 227579 The CLIC two beam acceleration technology requires a drive beam phase stability of better than 0.3 deg rms at 12 GHz, corresponding to a timing stability below 50 fs rms. For this reason the CLIC design includes a phase stabilization feed-forward system. It relies on precise beam phase measurement and its subsequent correction in a chicane with help of fast kickers. A prototype of such a system is being installed in CLIC Test Facility CTF3. In this paper we describe in detail its design and implementation. Additionally, we present and discuss the performance of the precision phase monitor prototypes installed at the end of the CTF3 linac, measured with the drive beam. We would like to acknowledge support of G.Sensolini, A.Zolla (INFN/LNF Frascati), N.S.Chritin and J-M.Scigliuto (CERN) in design and fabrication of components.
	Slides WEOBB203 [6.770 MB]

WEPME053	Latest Performance Results from the FONT 5 Intra Train Beam Position Feedback System at ATF	3049
	M.R. Davis, D.R. Bett, N. Blaskovic Kraljevic, P. Burrows, G.B. Christian, Y.I. Kim, C. Perry JAI, Oxford, United Kingdom R. Apsimon, B. Constance, A. Gerbershagen CERN, Geneva, Switzerland
	A prototype ultra-fast beam-based feedback system for deployment in single-pass beamlines, such as a future lepton collider (ILC or CLIC) or a free-electron laser, has been fabricated and is being tested in the extraction and final focus lines of the Accelerator Test Facility (ATF) at KEK. FONT5 is an intra-train feedback system for stabilising the beam orbit via different methods: a position and angle feedback correction in the extraction line or a vertical feedforward correction applied at the interaction point (IP) . Two systems comprise three stripline beam position monitors (BPMs) and two stripline kickers in the extraction line, two cavity BPMs and a stripline kicker at the IP, a custom FPGA-based digital processing board, custom kicker-drive amplifiers and low-latency analogue front-end BPM processors. Latest results from the experiment are presented. These include beam position correction in the extraction line, as well as preliminary results of beam correction at the IP.

WEOBB203	Design of Phase Feed Forward System in CTF3 and Performance of Fast Beam Phase Monitors	2097
	P. Skowroński, A. Andersson, A. Gerbershagen, E. Ikarios, J. Roberts CERN, Geneva, Switzerland P. Burrows, G.B. Christian, A. Gerbershagen, C. Perry, J. Roberts JAI, Oxford, United Kingdom P. Burrows, G.B. Christian, A. Gerbershagen, C. Perry Oxford University, Physics Department, Oxford, Oxon, United Kingdom A. Ghigo, F. Marcellini INFN/LNF, Frascati (Roma), Italy E. Ikarios National Technical University of Athens, Athens, Greece
	Funding: Work supported by the European Commission under the FP7 Research Infrastructures project Eu- CARD, grant agreement no. 227579 The CLIC two beam acceleration technology requires a drive beam phase stability of better than 0.3 deg rms at 12 GHz, corresponding to a timing stability below 50 fs rms. For this reason the CLIC design includes a phase stabilization feed-forward system. It relies on precise beam phase measurement and its subsequent correction in a chicane with help of fast kickers. A prototype of such a system is being installed in CLIC Test Facility CTF3. In this paper we describe in detail its design and implementation. Additionally, we present and discuss the performance of the precision phase monitor prototypes installed at the end of the CTF3 linac, measured with the drive beam. We would like to acknowledge support of G.Sensolini, A.Zolla (INFN/LNF Frascati), N.S.Chritin and J-M.Scigliuto (CERN) in design and fabrication of components.
	Slides WEOBB203 [6.770 MB]

WEOBB203	Design of Phase Feed Forward System in CTF3 and Performance of Fast Beam Phase Monitors	2097
	P. Skowroński, A. Andersson, A. Gerbershagen, E. Ikarios, J. Roberts CERN, Geneva, Switzerland P. Burrows, G.B. Christian, A. Gerbershagen, C. Perry, J. Roberts JAI, Oxford, United Kingdom P. Burrows, G.B. Christian, A. Gerbershagen, C. Perry Oxford University, Physics Department, Oxford, Oxon, United Kingdom A. Ghigo, F. Marcellini INFN/LNF, Frascati (Roma), Italy E. Ikarios National Technical University of Athens, Athens, Greece
	Funding: Work supported by the European Commission under the FP7 Research Infrastructures project Eu- CARD, grant agreement no. 227579 The CLIC two beam acceleration technology requires a drive beam phase stability of better than 0.3 deg rms at 12 GHz, corresponding to a timing stability below 50 fs rms. For this reason the CLIC design includes a phase stabilization feed-forward system. It relies on precise beam phase measurement and its subsequent correction in a chicane with help of fast kickers. A prototype of such a system is being installed in CLIC Test Facility CTF3. In this paper we describe in detail its design and implementation. Additionally, we present and discuss the performance of the precision phase monitor prototypes installed at the end of the CTF3 linac, measured with the drive beam. We would like to acknowledge support of G.Sensolini, A.Zolla (INFN/LNF Frascati), N.S.Chritin and J-M.Scigliuto (CERN) in design and fabrication of components.
	Slides WEOBB203 [6.770 MB]