IBIC2015 - List of Authors (Effinger, E.)

Paper	Title	Page
MOPB045	BLM Crosstalk Studies on the CLIC Two-Beam Module	148
	M. Kastriotou, S. Döbert, F.S. Domingues Sousa, E. Effinger, W. Farabolini, E.B. Holzer, E. Nebot Del Busto, W. Viganò CERN, Geneva, Switzerland W. Farabolini CEA/DSM/IRFU, CEA/DSM/IRFU, France M. Kastriotou, E. Nebot Del Busto, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom M. Kastriotou, C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom
	The Compact Linear Collider (CLIC) is a proposal for a future linear e⁺-e⁻ accelerator that can reach 3 TeV centre of mass energy. It is based on a two-beam acceleration scheme, with two accelerators operating in parallel. One of the main CLIC elements is a 2 m long two-beam module where power from a high intensity, low energy drive beam is extracted through Power Extraction and Transfer Structures (PETS) and transferred as RF power for the acceleration of the low intensity, high energy main beam. One of the main potential limitations for a Beam Loss Monitoring (BLM) system in a two-beam accelerator is so-called 'crosstalk', i.e. signals generated by losses in one beam, but detected by a monitor protecting the other beam. This contribution presents results from comprehensive studies into crosstalk that have been performed at a two-beam module at the CLIC Test Facility (CTF3) at CERN. The capability of estimating the origin of losses for different scenarios is also discussed.
	Poster MOPB045 [2.471 MB]
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TUPB052	Wire Scanners and Vibrations - Models and Measurements	437
	J. Herranz, B. Dehning, E. Effinger, J. Emery, A. Guerrero, C. Pereira CERN, Geneva, Switzerland A. Barjau, J. Herranz Universitat Politécnica de Catalunya, Barcelona, Spain J. Herranz Proactive Research and Development, Barcelona, Spain
	The new fast wire scanner foreseen to measure small emittance beams throughout the LHC injector chain will have a wire travelling at a speed of up to 20 m.s⁻¹, with a requested wire position measurement accuracy of the order of a few microns. The vibration of the thin carbon wires used has been identified as one of the major error sources on the wire position accuracy. In this project the most challenging and innovative development has been the wire vibrations measurement strategy based on the piezo resistive effect of the wire itself, while the deflection of the fork supporting the wire has been measured by semiconductor strain gauges. Dynamic models of the wire and fork have been created to predict the behaviour of the fork-wire assembly. This model, validated by the measurements, has then been used for optimisation of the wire-fork assembly. The contribution will discuss the measurement setup and the model development as well as their comparison. In addition it will show that this technology can easily be implemented in current operating devices without major modifications. For the first time the piezo resistive effect is used for wire vibrations measurements during the scan.
	Poster TUPB052 [2.455 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

BLM Crosstalk Studies on the CLIC Two-Beam Module

148

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

The Compact Linear Collider (CLIC) is a proposal for a future linear e⁺-e⁻ accelerator that can reach 3 TeV centre of mass energy. It is based on a two-beam acceleration scheme, with two accelerators operating in parallel. One of the main CLIC elements is a 2 m long two-beam module where power from a high intensity, low energy drive beam is extracted through Power Extraction and Transfer Structures (PETS) and transferred as RF power for the acceleration of the low intensity, high energy main beam. One of the main potential limitations for a Beam Loss Monitoring (BLM) system in a two-beam accelerator is so-called 'crosstalk', i.e. signals generated by losses in one beam, but detected by a monitor protecting the other beam. This contribution presents results from comprehensive studies into crosstalk that have been performed at a two-beam module at the CLIC Test Facility (CTF3) at CERN. The capability of estimating the origin of losses for different scenarios is also discussed.

Poster MOPB045 [2.471 MB]

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TUPB052

Wire Scanners and Vibrations - Models and Measurements

437

J. Herranz, B. Dehning, E. Effinger, J. Emery, A. Guerrero, C. Pereira
CERN, Geneva, Switzerland
A. Barjau, J. Herranz
Universitat Politécnica de Catalunya, Barcelona, Spain
J. Herranz
Proactive Research and Development, Barcelona, Spain

The new fast wire scanner foreseen to measure small emittance beams throughout the LHC injector chain will have a wire travelling at a speed of up to 20 m.s⁻¹, with a requested wire position measurement accuracy of the order of a few microns. The vibration of the thin carbon wires used has been identified as one of the major error sources on the wire position accuracy. In this project the most challenging and innovative development has been the wire vibrations measurement strategy based on the piezo resistive effect of the wire itself, while the deflection of the fork supporting the wire has been measured by semiconductor strain gauges. Dynamic models of the wire and fork have been created to predict the behaviour of the fork-wire assembly. This model, validated by the measurements, has then been used for optimisation of the wire-fork assembly. The contribution will discuss the measurement setup and the model development as well as their comparison. In addition it will show that this technology can easily be implemented in current operating devices without major modifications. For the first time the piezo resistive effect is used for wire vibrations measurements during the scan.

Poster TUPB052 [2.455 MB]

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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]

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