IBIC2014 - List of Authors (Holzer, E.B.)

Paper	Title	Page
TUCZB3	A Quantum Gas Jet for Non-Invasive Beam Profile Measurement	284
	A. Jeff, E.B. Holzer, T. Lefèvre CERN, Geneva, Switzerland A. Jeff, V. Tzoganis, C.P. Welsch, H.D. Zhang The University of Liverpool, Liverpool, United Kingdom V. Tzoganis, C.P. Welsch, H.D. Zhang Cockcroft Institute, Warrington, Cheshire, United Kingdom
	A novel instrument for accelerator beam diagnostics is being developed by using De Broglie-wave focusing to create an ultra-thin neutral gas jet. Scanning the gas jet across a particle beam while measuring the interaction products, the beam profile can be measured. Such a jet scanner will provide an invaluable diagnostic tool in beams which are too intense for the use of wire scanners, such as the proposed CLIC Drive Beam. In order to create a sufficiently thin jet, a focusing element working on the DeBroglie wavelength of the Helium atom has been designed. Following the principles of the Photon Sieve, we have constructed an Atomic Sieve consisting of 5230 nano-holes etched into a thin film of silicon nitride. When a quasi-monochromatic Helium jet is incident on the sieve, an interference pattern with a single central maximum is created. The stream of Helium atoms passing through this central maximum is much narrower than a conventional gas jet. The first experiences with this device are presented here, along with plans for further tests.
	Slides TUCZB3 [13.880 MB]
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WECZB3	Measurement of Beam Losses Using Optical Fibers at the Australian Synchrotron	515
	E. Nebot Del Busto, C.P. Welsch The University of Liverpool, Liverpool, United Kingdom M.J. Boland ASCo, Clayton, Victoria, Australia M.J. Boland, R.P. Rassool The University of Melbourne, Melbourne, Victoria, Australia E.B. Holzer, M. Kastriotou, E. Nebot Del Busto CERN, Geneva, Switzerland P.D. Jackson University of Adelaide, Adelaide, Australia J. Schmidt Albert-Ludwig Universität Freiburg, Freiburg, Germany C.P. Welsch Cockcroft Institute, Warrington, Cheshire, United Kingdom
	The unprecedented requirements that new machines are setting on their diagnostic systems are leading to the development of a new generation of devices with large dynamic range, sensitivity and time resolution. Beam loss detection is particularly challenging due to the large extension of new facilities that need to be covered with localized detectors. Candidates to mitigate this problem consist of systems in which the sensitive part of the radiation detectors can be extended over the long distances of beam lines. In this document, we study the feasibility of a beam loss monitor (BLM) system based on optical fibers as an active detector for an electron storage ring. The Australian Synchrotron (AS) comprises a 216m ring that stores electrons up to 3GeV. The Accelerator has recently claimed the world record lowest transverse emittance (below 1 pm rad). Ultra low transverse sizes and large amounts of synchrotron radiation provide an environment very similar to that expected in the CLIC damping rings. A qualitative benchmark of beam losses under damping ring-like conditions is presented here. A wide range of beam loss rates can be achieved by modifying the bunch charge, horizontal/vertical coupling and dynamic aperture as well as via beam scrapers. The controlled beam losses are observed by means of the Cherenkov light produced in a 365 um core Silica fiber. The output light is coupled to different types of photo sensors namely: Multi Pixel Photon Counters (MPPCs), standard PhotoMulTiplier (PMT) tubes and Avalanche PhotoDiodes (APD). A detailed comparison of the sensitivities and time resolution obtained with the different read-outs are discussed in this contribution.
	Slides WECZB3 [2.755 MB]
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Paper

Title

Page

A Quantum Gas Jet for Non-Invasive Beam Profile Measurement

284

A. Jeff, E.B. Holzer, T. Lefèvre
CERN, Geneva, Switzerland
A. Jeff, V. Tzoganis, C.P. Welsch, H.D. Zhang
The University of Liverpool, Liverpool, United Kingdom
V. Tzoganis, C.P. Welsch, H.D. Zhang
Cockcroft Institute, Warrington, Cheshire, United Kingdom

A novel instrument for accelerator beam diagnostics is being developed by using De Broglie-wave focusing to create an ultra-thin neutral gas jet. Scanning the gas jet across a particle beam while measuring the interaction products, the beam profile can be measured. Such a jet scanner will provide an invaluable diagnostic tool in beams which are too intense for the use of wire scanners, such as the proposed CLIC Drive Beam. In order to create a sufficiently thin jet, a focusing element working on the DeBroglie wavelength of the Helium atom has been designed. Following the principles of the Photon Sieve, we have constructed an Atomic Sieve consisting of 5230 nano-holes etched into a thin film of silicon nitride. When a quasi-monochromatic Helium jet is incident on the sieve, an interference pattern with a single central maximum is created. The stream of Helium atoms passing through this central maximum is much narrower than a conventional gas jet. The first experiences with this device are presented here, along with plans for further tests.

Slides TUCZB3 [13.880 MB]

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WECZB3

Measurement of Beam Losses Using Optical Fibers at the Australian Synchrotron

515

E. Nebot Del Busto, C.P. Welsch
The University of Liverpool, Liverpool, United Kingdom
M.J. Boland
ASCo, Clayton, Victoria, Australia
M.J. Boland, R.P. Rassool
The University of Melbourne, Melbourne, Victoria, Australia
E.B. Holzer, M. Kastriotou, E. Nebot Del Busto
CERN, Geneva, Switzerland
P.D. Jackson
University of Adelaide, Adelaide, Australia
J. Schmidt
Albert-Ludwig Universität Freiburg, Freiburg, Germany
C.P. Welsch
Cockcroft Institute, Warrington, Cheshire, United Kingdom

The unprecedented requirements that new machines are setting on their diagnostic systems are leading to the development of a new generation of devices with large dynamic range, sensitivity and time resolution. Beam loss detection is particularly challenging due to the large extension of new facilities that need to be covered with localized detectors. Candidates to mitigate this problem consist of systems in which the sensitive part of the radiation detectors can be extended over the long distances of beam lines. In this document, we study the feasibility of a beam loss monitor (BLM) system based on optical fibers as an active detector for an electron storage ring. The Australian Synchrotron (AS) comprises a 216m ring that stores electrons up to 3GeV. The Accelerator has recently claimed the world record lowest transverse emittance (below 1 pm rad). Ultra low transverse sizes and large amounts of synchrotron radiation provide an environment very similar to that expected in the CLIC damping rings. A qualitative benchmark of beam losses under damping ring-like conditions is presented here. A wide range of beam loss rates can be achieved by modifying the bunch charge, horizontal/vertical coupling and dynamic aperture as well as via beam scrapers. The controlled beam losses are observed by means of the Cherenkov light produced in a 365 um core Silica fiber. The output light is coupled to different types of photo sensors namely: Multi Pixel Photon Counters (MPPCs), standard PhotoMulTiplier (PMT) tubes and Avalanche PhotoDiodes (APD). A detailed comparison of the sensitivities and time resolution obtained with the different read-outs are discussed in this contribution.

Slides WECZB3 [2.755 MB]

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