IBIC2015 - List of Authors (Bobb, L.M.)

Paper	Title	Page
MOPB066	Streak Camera PSF Optimisation and Dual Sweep Calibration for Sub-ps Bunch Length Measurement	206
	L.M. Bobb, A.F.D. Morgan, G. Rehm DLS, Oxfordshire, United Kingdom
	Streak cameras are commonly used for bunch length measurement. In normal beam modes, bunch lengths are on the order of 10 ps. For the study of microbunch instabilities, a low alpha single bunch mode is implemented with bunch lengths approaching 1 ps and beam current in the tens of microamps. In order to reliably measure such a short bunch at low beam currents, the input optics for the streak camera must be optimised for sufficient incident light intensity and high resolution in both sweep directions. This is achieved through the use of reflective input optics in which a pinhole is imaged to provide a small circular Point Spread Function. Furthermore to precisely measure the bunch length, the calibration of the dual sweep must be known. Here we describe a calibration method using electrical delays to incorporate calibration information within streak camera images.
	Poster MOPB066 [1.970 MB]
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TUPB057	Development of a Versatile OTR-ODR Station for Future Linear Colliders	461
	R. Kieffer, M. Bergamaschi, T. Lefèvre, S. Mazzoni CERN, Geneva, Switzerland T. Aumeyr, P. Karataev Royal Holloway, University of London, Surrey, United Kingdom M.G. Billing, J.V. Conway, J.P. Shanks Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA L.M. Bobb DLS, Oxfordshire, United Kingdom N. Terunuma KEK, Ibaraki, Japan
	In order to study the feasibility of Optical Transition (OTR) and Diffraction (ODR) Radiation based profile measurement for the future electron-positron linear colliders (ILC, CLIC) a new dedicated instrument is under development at CERN to be installed in KEK-ATF2 beam line in fall 2015. To optimize sensitivity to micron and sub-micron beam sizes, we plan to observe ODR/OTR in the visible-UV wavelength range, down to approximately 150 nm. ODR light will be produced by narrow (25-500 μm) slits with non-uniform reflectivity. To improve our knowledge on the complex pattern produced by ODR, a preparatory experiment is being conducted on the CTF3 CALIFES beam line (CERN). This device produces interferences between two OTR screens in the visible optical range with the possibility to control the distance between them, i.e. to probe the shadowing region. The new results of this OTR interference measurement will be presented, together with the latest results from the ODR run in CesrTA (Wilson lab-Cornell).
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Paper

Title

Page

Streak Camera PSF Optimisation and Dual Sweep Calibration for Sub-ps Bunch Length Measurement

206

L.M. Bobb, A.F.D. Morgan, G. Rehm
DLS, Oxfordshire, United Kingdom

Streak cameras are commonly used for bunch length measurement. In normal beam modes, bunch lengths are on the order of 10 ps. For the study of microbunch instabilities, a low alpha single bunch mode is implemented with bunch lengths approaching 1 ps and beam current in the tens of microamps. In order to reliably measure such a short bunch at low beam currents, the input optics for the streak camera must be optimised for sufficient incident light intensity and high resolution in both sweep directions. This is achieved through the use of reflective input optics in which a pinhole is imaged to provide a small circular Point Spread Function. Furthermore to precisely measure the bunch length, the calibration of the dual sweep must be known. Here we describe a calibration method using electrical delays to incorporate calibration information within streak camera images.

Poster MOPB066 [1.970 MB]

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TUPB057

Development of a Versatile OTR-ODR Station for Future Linear Colliders

461

R. Kieffer, M. Bergamaschi, T. Lefèvre, S. Mazzoni
CERN, Geneva, Switzerland
T. Aumeyr, P. Karataev
Royal Holloway, University of London, Surrey, United Kingdom
M.G. Billing, J.V. Conway, J.P. Shanks
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
L.M. Bobb
DLS, Oxfordshire, United Kingdom
N. Terunuma
KEK, Ibaraki, Japan

In order to study the feasibility of Optical Transition (OTR) and Diffraction (ODR) Radiation based profile measurement for the future electron-positron linear colliders (ILC, CLIC) a new dedicated instrument is under development at CERN to be installed in KEK-ATF2 beam line in fall 2015. To optimize sensitivity to micron and sub-micron beam sizes, we plan to observe ODR/OTR in the visible-UV wavelength range, down to approximately 150 nm. ODR light will be produced by narrow (25-500 μm) slits with non-uniform reflectivity. To improve our knowledge on the complex pattern produced by ODR, a preparatory experiment is being conducted on the CTF3 CALIFES beam line (CERN). This device produces interferences between two OTR screens in the visible optical range with the possibility to control the distance between them, i.e. to probe the shadowing region. The new results of this OTR interference measurement will be presented, together with the latest results from the ODR run in CesrTA (Wilson lab-Cornell).

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