Artigo Acesso aberto Revisado por pares

Compton scattering off polarized electrons with a high-finesse Fabry–Pérot Cavity at JLab

2001; Elsevier BV; Volume: 459; Issue: 3 Linguagem: Inglês

10.1016/s0168-9002(00)01049-4

ISSN

1872-9576

Autores

Nicholas Falletto, M. Authier, Maud Baylac, M. Boyer, F. Bugeon, E. Burtin, C. Cavata, N. Colombel, G. Congretel, R Coquillard, G. Coulloux, B Couzy, P. Deck, A. Delbart, Daniel Desforges, A. Donati, Bruno Duboué, S. Escoffier, F Farci, B. Frois, P. Girardot, J Guillotau, C. Henriot, C. Jeanney, Michel Juillard, Jean-Paul Jorda, P. Legou, D. Lhuillier, Y. Lussignol, Ph. Mangeot, Xabier Sarasola Martin, F. Marie, J. Martino, M. Maurier, B. Mazeau, J.F. Millot, F. Molinié, J.-P. Mols, J.P. Mouly, Marieke Mur, D. Neyret, T Pédrol, S. Platchkov, G Pontet, T. Pussieux, Y. Queinec, P. Rebourgeard, J.C. Sellier, G. Tarte, C. Veyssière, A. Z. Zakarian, P.Y. Bertin, A. Cosquer, J.P Chen, Jason W. Mitchell, Jean-Marie Mackowski, Laurent Pinard,

Tópico(s)

Magnetic confinement fusion research

Resumo

We built and commissioned a new type of Compton polarimeter to measure the electron beam polarization at the Thomas Jefferson National Accelerator Facility (Virginia, USA). The heart of this polarimeter is a high-finesse monolithic Fabry–Pérot cavity. Its purpose is to amplify a primary 300 mW laser beam in order to improve the signal to noise ratio of the polarimeter. It is the first time that a high-finesse Fabry–Pérot cavity is enclosed in the vacuum of a particle accelerator to monitor the beam polarization by Compton polarimetry. The measured finesse and amplification gain of the cavity are F=26000 and G=7300. The electron beam crosses this high-power photon source at an angle of 23 mrad in the middle of the cavity where the photon beam power density is estimated to be 0.85MW/cm2. We have used this facility during the HAPPEX experiment (April–July 1999) and we give a preliminary measurement of Compton scattering asymmetry.

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