IBIC2015 - List of Authors (Boland, M.J.)

Paper	Title	Page
MOPB049	An Optical Intra-Bunch Instability Monitor for Short Electron Bunches	161
	T.G. Lucas, P.J. Giansiracusa, D.J. Peake, R.P. Rassool The University of Melbourne, Melbourne, Victoria, Australia M.J. Boland ASCo, Clayton, Victoria, Australia R.J. Steinhagen GSI, Darmstadt, Germany
	An improved understanding of intra-bunch instabilities in synchrotron light source electron bunches is crucial to overcoming the imposed limitations of the achievable intensity. A Multiband Instability Monitor, designed specifically for the short bunches of a synchrotron light source, has been developed to perform measurements of intra-bunch dynamics. The MIM performs real-time measurements at a diagnostic beamline using optical synchrotron radiation incident on a high speed photodetector. Three frequency bands up to 12 GHz were used to identify characteristic frequency signatures of intra-bunch instabilities. Mixed to baseband using RF detectors, these high frequency measurements can be performed without the need for similarly high frequency digitisers. This paper reports on the performance of the system at the Australian Synchrotron.
	Poster MOPB049 [0.928 MB]
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WEBLA03	Position Resolution of Optical Fibre-Based Beam Loss Monitors Using Long Electron Pulses	580
	E. Nebot Del Busto, S. Döbert, F.S. Domingues Sousa, E. Effinger, W. Farabolini, E.B. Holzer, M. Kastriotou, W. Viganò CERN, Geneva, Switzerland M.J. Boland ASCo, Clayton, Victoria, Australia M.J. Boland SLSA, Clayton, Australia M.J. Boland, R.P. Rassool The University of Melbourne, Melbourne, Victoria, Australia W. Farabolini CEA/DSM/IRFU, France M. Kastriotou, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom M. Kastriotou, E. Nebot Del Busto, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom
	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.
	Slides WEBLA03 [2.109 MB]
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Paper

Title

Page

An Optical Intra-Bunch Instability Monitor for Short Electron Bunches

161

T.G. Lucas, P.J. Giansiracusa, D.J. Peake, R.P. Rassool
The University of Melbourne, Melbourne, Victoria, Australia
M.J. Boland
ASCo, Clayton, Victoria, Australia
R.J. Steinhagen
GSI, Darmstadt, Germany

An improved understanding of intra-bunch instabilities in synchrotron light source electron bunches is crucial to overcoming the imposed limitations of the achievable intensity. A Multiband Instability Monitor, designed specifically for the short bunches of a synchrotron light source, has been developed to perform measurements of intra-bunch dynamics. The MIM performs real-time measurements at a diagnostic beamline using optical synchrotron radiation incident on a high speed photodetector. Three frequency bands up to 12 GHz were used to identify characteristic frequency signatures of intra-bunch instabilities. Mixed to baseband using RF detectors, these high frequency measurements can be performed without the need for similarly high frequency digitisers. This paper reports on the performance of the system at the Australian Synchrotron.

Poster MOPB049 [0.928 MB]

Export •

reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)

WEBLA03

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

580

E. Nebot Del Busto, S. Döbert, F.S. Domingues Sousa, E. Effinger, W. Farabolini, E.B. Holzer, M. Kastriotou, W. Viganò
CERN, Geneva, Switzerland
M.J. Boland
ASCo, Clayton, Victoria, Australia
M.J. Boland
SLSA, Clayton, Australia
M.J. Boland, R.P. Rassool
The University of Melbourne, Melbourne, Victoria, Australia
W. Farabolini
CEA/DSM/IRFU, France
M. Kastriotou, C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom
M. Kastriotou, E. Nebot Del Busto, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom

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.

Slides WEBLA03 [2.109 MB]

Export •

reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)