F. Poirier

Proposing a laser based beam size monitor for the future linear collider

Compton scattering techniques for the measurement of the transverse beam size of particle beams at future linear colliders (FLC) are proposed. At several locations of the beam delivery system (BDS) of the FLC, beam spot sizes ranging from several hundreds to a few micrometers have to be measured. This is necessary to verify beam optics, to obtain the transverse beam emittance, and to achieve the highest possible luminosity. The large demagnification of the beam in the BDS and the high beam power puts extreme conditions on any measuring device. With conventional techniques at their operational limit in FLC scenarios, new methods for the detection of the transverse beam size have to be developed. For this laser based techniques are proposed capable of measuring high power beams with sizes in the micrometer range. In this paper general aspects and critical issues of a generic device are outlined and specific solutions proposed. Plans to install a laser wire experiment at an accelerator test facility are presented.

Beam profile measurements with the 2-D laser-wire at petra

The current PETRA II Laser-Wire system, being developed for the ILC and PETRA III, uses a piezo- driven mirror to scan laser light across an electron bunch. This paper reports on the recently installed electron-beam finding system, presenting recent horizontal and vertical profile scans with corresponding studies.

Compton scattering techniques for the measurement of the transverse beam size of particle beams at future linear colliders

21st Beam Dynamics Workshop on Laser-Beam Interactions, State University of New York, Stony Brook, NY, USA, 11 Jun 2001 - 15 Jun 2001; 6 pp. (2001).