IBIC2013 - List of Authors (Nevay, L.J.)

Paper

Title

Page

Sub-Micrometre Resolution Laserwire Transverse Beam Size Measurement System

243

L.J. Nevay
JAI, Egham, Surrey, United Kingdom
A.S. Aryshev, N. Terunuma, J. Urakawa
KEK, Ibaraki, Japan
S.T. Boogert, P. Karataev, K.O. Kruchinin
Royal Holloway, University of London, Surrey, United Kingdom
L. Corner, R. Walczak
Oxford University, Physics Department, Oxford, Oxon, United Kingdom

The laserwire system at the Accelerator Test Facility 2 (ATF2) is a transverse beam profile measurement system capable of measuring a micrometre-size electron beam. We present recent results demonstrating a measured vertical size of 1.16 ± 0.06 μm and a horizontal size of 110.1 ± 3.8 μm. Due to the high aspect ratio of the electron beam, the natural divergence of the tightly focussed laser beam across the electron beam width requires the use of the full overlap integral to deconvolve the scans. For this to be done accurately, the propagation of the 150 mJ, 167 ps long laser pulses was precisely measured at a scaled virtual interaction point.

WEPC46

Beam Delivery Simulation (BDSIM): A Geant4 Based Toolkit for Diagnostics and Loss Simulation

799

S.T. Boogert
Royal Holloway, University of London, Surrey, United Kingdom
S.T. Boogert, S.M. Gibson, R. Kwee-Hinzmann, L.J. Nevay, J. Snuverink
JAI, Egham, Surrey, United Kingdom
L.C. Deacon
CERN, Geneva, Switzerland

BDSIM is a Geant4 and C++ based particle tracking code which seamlessly tracks particles in accelerators and particle detectors, including the full range of particle interaction physics processes in Geant4. The code has been used to model the backgrounds in the International Linear Collider (ILC), Compact Linear Collider (CLIC), Accelerator Test Facility 2 (ATF2) and more recently the Large Hadron Collider (LHC). This paper outlines the current code and possible example applications and presents a roadmap for future developments.

WEAL2

Extremely Low Emittance Beam Size Diagnostics with Sub-Micrometer Resolution Using Optical Transition Radiation

615

K.O. Kruchinin, S.T. Boogert, P. Karataev, L.J. Nevay
Royal Holloway, University of London, Surrey, United Kingdom
A.S. Aryshev, M.V. Shevelev, N. Terunuma, J. Urakawa
KEK, Ibaraki, Japan
B. Bolzon
The University of Liverpool, Liverpool, United Kingdom
B. Bolzon, T. Lefèvre, S. Mazzoni
CERN, Geneva, Switzerland

Transverse electron beam diagnostics is crucial for stable and reliable operation of the future electron-positron linear colliders such as CLIC or Higgs Factory. The-state-of-the-art in transverse beam diagnostics is based on the laser-wire technology. However, it requires a high power laser significantly increases the cost of the laser-wire system. Therefore, a simpler and relatively inexpensive method is required. A beam profile monitor based on Optical Transition Radiation (OTR) is very promising. The resolution of conventional OTR monitor is defined by a root-mean-square of the so-called Point Spread Function (PSF). In optical wavelength range the resolution is diffraction limited down to a few micrometers. However, in * we demonstrated that the OTR PSF has a structure which visibility can be used to monitor vertical beam size with sub-micrometer resolution. In this report we shall represent the recent experimental results of a micron-scale beam size measurement. We shall describe the entire method including calibration procedure, new analysis, and calculation of uncertainties. We shall discuss the hardware status and future plans.
* P. Karataev et al., Physical Review Letters 107, 174801 (2011).

Slides WEAL2 [5.120 MB]

Paper	Title	Page
MOPF16	Sub-Micrometre Resolution Laserwire Transverse Beam Size Measurement System	243
	L.J. Nevay JAI, Egham, Surrey, United Kingdom A.S. Aryshev, N. Terunuma, J. Urakawa KEK, Ibaraki, Japan S.T. Boogert, P. Karataev, K.O. Kruchinin Royal Holloway, University of London, Surrey, United Kingdom L. Corner, R. Walczak Oxford University, Physics Department, Oxford, Oxon, United Kingdom
	The laserwire system at the Accelerator Test Facility 2 (ATF2) is a transverse beam profile measurement system capable of measuring a micrometre-size electron beam. We present recent results demonstrating a measured vertical size of 1.16 ± 0.06 μm and a horizontal size of 110.1 ± 3.8 μm. Due to the high aspect ratio of the electron beam, the natural divergence of the tightly focussed laser beam across the electron beam width requires the use of the full overlap integral to deconvolve the scans. For this to be done accurately, the propagation of the 150 mJ, 167 ps long laser pulses was precisely measured at a scaled virtual interaction point.

WEPC46	Beam Delivery Simulation (BDSIM): A Geant4 Based Toolkit for Diagnostics and Loss Simulation	799
	S.T. Boogert Royal Holloway, University of London, Surrey, United Kingdom S.T. Boogert, S.M. Gibson, R. Kwee-Hinzmann, L.J. Nevay, J. Snuverink JAI, Egham, Surrey, United Kingdom L.C. Deacon CERN, Geneva, Switzerland
	BDSIM is a Geant4 and C++ based particle tracking code which seamlessly tracks particles in accelerators and particle detectors, including the full range of particle interaction physics processes in Geant4. The code has been used to model the backgrounds in the International Linear Collider (ILC), Compact Linear Collider (CLIC), Accelerator Test Facility 2 (ATF2) and more recently the Large Hadron Collider (LHC). This paper outlines the current code and possible example applications and presents a roadmap for future developments.

WEAL2	Extremely Low Emittance Beam Size Diagnostics with Sub-Micrometer Resolution Using Optical Transition Radiation	615
	K.O. Kruchinin, S.T. Boogert, P. Karataev, L.J. Nevay Royal Holloway, University of London, Surrey, United Kingdom A.S. Aryshev, M.V. Shevelev, N. Terunuma, J. Urakawa KEK, Ibaraki, Japan B. Bolzon The University of Liverpool, Liverpool, United Kingdom B. Bolzon, T. Lefèvre, S. Mazzoni CERN, Geneva, Switzerland
	Transverse electron beam diagnostics is crucial for stable and reliable operation of the future electron-positron linear colliders such as CLIC or Higgs Factory. The-state-of-the-art in transverse beam diagnostics is based on the laser-wire technology. However, it requires a high power laser significantly increases the cost of the laser-wire system. Therefore, a simpler and relatively inexpensive method is required. A beam profile monitor based on Optical Transition Radiation (OTR) is very promising. The resolution of conventional OTR monitor is defined by a root-mean-square of the so-called Point Spread Function (PSF). In optical wavelength range the resolution is diffraction limited down to a few micrometers. However, in * we demonstrated that the OTR PSF has a structure which visibility can be used to monitor vertical beam size with sub-micrometer resolution. In this report we shall represent the recent experimental results of a micron-scale beam size measurement. We shall describe the entire method including calibration procedure, new analysis, and calculation of uncertainties. We shall discuss the hardware status and future plans. * P. Karataev et al., Physical Review Letters 107, 174801 (2011).
	Slides WEAL2 [5.120 MB]