Paper |
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THPLT026 |
Beam Profile Measurements at PETRA with the Laserwire Compton Scattering Monitor
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2526 |
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- T. Kamps
BESSY GmbH, Berlin
- K. Balewski, H.-C. Lewin, S. Schreiber, K. Wittenburg
DESY, Hamburg
- G.A. Blair, G. Boorman, J. Carter, F. Poirier
Royal Holloway, University of London, Surrey
- S.T. Boogert
UCL, London
- T. Lefevre
CERN, Geneva
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The vertical beam profile at the PETRA positron storage ring has been measured using a laserwire scanner. A laserwire monitor is a device which can measure high brilliant beam profiles by scanning a finely focused laser beam non-invasively across the charged particle beam. Evaluation of the Compton scattered photon flux as a function of the laser beam position yields the transverse beam profile. The aim of the experiment at PETRA is to obtain the profile of the positron beam at several GeV energy and several nC bunch charge. Key elements of laserwire systems are currently being studied and are described in this paper such as laser beam optics, a fast scanning system and a photon calorimeter. Results are presented from positron beam profile scans using orbit bumps and a fast scanning scheme.
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THPLT027 |
Optical Transition Radiation Based Beam Diagnostics at the BESSY Synchrotron Radiation Source and FEL Accelerators
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2529 |
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- T. Kamps, K. Holldack, P. Kuske
BESSY GmbH, Berlin
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Optical Transition Radiation (OTR) based diagnostics tools are widely used in linear accelerators to measure beam parameters like transverse beam size and emittance. Design ideas for OTR stations in the linac section of the BESSY FEL facility are presented. Several key components will be tested in the transfer lines of the BESSY storage ring. Furthermore a novel type of OTR monitor is introduced which enables the measurement of the transverse overlap of seed laser and electron beam in the undulator sections of the linac based FEL facility. Here a special radiator screen will be used allowing simultaneous imaging of both beams in the same optical readout channel.
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