IBIC2012 - List of Authors (Boogert, S.T.)

Paper

Title

Page

A Prototype Cavity Beam Position Monitor for the CLIC Main Beam

95

F.J. Cullinan, S.T. Boogert, N.Y. Joshi, A. Lyapin
JAI, Egham, Surrey, United Kingdom
D. Bastard, E. Calvo, N. Chritin, F. Guillot-Vignot, T. Lefèvre, L. Søby, M. Wendt
CERN, Geneva, Switzerland
A. Lunin, V.P. Yakovlev
Fermilab, Batavia, USA
S.R. Smith
SLAC, Menlo Park, California, USA

The Compact Linear Collider (CLIC) places unprecedented demands on its diagnostics systems. A large number of cavity beam position monitors (BPMs) throughout the main linac and beam delivery system must routinely perform with 50 nm spatial resolution. Multiple position measurements within a single 156~ns bunch train are also required. A prototype low-Q cavity beam position monitor has been designed and built to be tested on the CLIC Test Facility (CTF3) probe beam. This paper presents the latest measurements of the prototype cavity BPM and the design and simulation of the radio frequency (RF) signal processing electronics with regards to the final performance. Installation of the BPM in the CTF3 probe beamline is also discussed.

WECA01

Theoretical and Experimental Investigation on Resolution of Optical Transition Radiation Transverse Beam Profile Monitor

A.S. Aryshev, N. Terunuma, J. Urakawa
KEK, Ibaraki, Japan
B. Bolzon, E. Bravin, T. Lefèvre
CERN, Geneva, Switzerland
S.T. Boogert, V. Karataev
Royal Holloway, University of London, Surrey, United Kingdom
L.J. Nevay
Oxford University, Physics Department, Oxford, Oxon, United Kingdom

Optical Transition Radiation (OTR) appearing when a charged particle crosses an interface between two media with different dielectric constants has widely been used as a tool for transverse profile measurements of charged particle beams in numerous facilities worldwide. The basic tuning methods and operation of conventional OTR monitors are well established for transverse beam sizes not smaller than 3-5 um. Since the Point Spread Function (PSF) dimension defines the resolution of the conventional monitors, for small electron beam dimensions the PSF form significantly depends on a presence of OTR tails diffraction and aberrations in the optical system. In our experiment we have managed to squeeze the electron beam such that we can practically measure PSF distribution in one direction. The revealed PSF structure is such that the visibility depends on the transverse beam size on micron scale. We developed an empirical calibration technique and successfully overcame the resolution limit of the common OTR monitor reaching sub-micron level. Here we represent the recent developments and upgrades in both setup and data analysis of a sub-micrometer electron beam profile monitor.

Slides WECA01 [2.230 MB]

Paper	Title	Page
MOPA18	A Prototype Cavity Beam Position Monitor for the CLIC Main Beam	95
	F.J. Cullinan, S.T. Boogert, N.Y. Joshi, A. Lyapin JAI, Egham, Surrey, United Kingdom D. Bastard, E. Calvo, N. Chritin, F. Guillot-Vignot, T. Lefèvre, L. Søby, M. Wendt CERN, Geneva, Switzerland A. Lunin, V.P. Yakovlev Fermilab, Batavia, USA S.R. Smith SLAC, Menlo Park, California, USA
	The Compact Linear Collider (CLIC) places unprecedented demands on its diagnostics systems. A large number of cavity beam position monitors (BPMs) throughout the main linac and beam delivery system must routinely perform with 50 nm spatial resolution. Multiple position measurements within a single 156~ns bunch train are also required. A prototype low-Q cavity beam position monitor has been designed and built to be tested on the CLIC Test Facility (CTF3) probe beam. This paper presents the latest measurements of the prototype cavity BPM and the design and simulation of the radio frequency (RF) signal processing electronics with regards to the final performance. Installation of the BPM in the CTF3 probe beamline is also discussed.

WECA01	Theoretical and Experimental Investigation on Resolution of Optical Transition Radiation Transverse Beam Profile Monitor
	A.S. Aryshev, N. Terunuma, J. Urakawa KEK, Ibaraki, Japan B. Bolzon, E. Bravin, T. Lefèvre CERN, Geneva, Switzerland S.T. Boogert, V. Karataev Royal Holloway, University of London, Surrey, United Kingdom L.J. Nevay Oxford University, Physics Department, Oxford, Oxon, United Kingdom
	Optical Transition Radiation (OTR) appearing when a charged particle crosses an interface between two media with different dielectric constants has widely been used as a tool for transverse profile measurements of charged particle beams in numerous facilities worldwide. The basic tuning methods and operation of conventional OTR monitors are well established for transverse beam sizes not smaller than 3-5 um. Since the Point Spread Function (PSF) dimension defines the resolution of the conventional monitors, for small electron beam dimensions the PSF form significantly depends on a presence of OTR tails diffraction and aberrations in the optical system. In our experiment we have managed to squeeze the electron beam such that we can practically measure PSF distribution in one direction. The revealed PSF structure is such that the visibility depends on the transverse beam size on micron scale. We developed an empirical calibration technique and successfully overcame the resolution limit of the common OTR monitor reaching sub-micron level. Here we represent the recent developments and upgrades in both setup and data analysis of a sub-micrometer electron beam profile monitor.
	Slides WECA01 [2.230 MB]