Author/Authors :
Escoffier، نويسنده , , S. and Bertin، نويسنده , , P.Y. and Brossard، نويسنده , , M. and Burtin، نويسنده , , E. and Cavata، نويسنده , , C. and Colombel، نويسنده , , N. G. de Jager، نويسنده , , C.W. and Delbart، نويسنده , , A. and Lhuillier، نويسنده , , Barry H. Schneider &
Matthew D. Lee &Marie-France Maisonneuve &
Sally M. Kuehn، نويسنده , , F. and Mitchell، نويسنده , , J. and Neyret، نويسنده , , D. and Pussieux، نويسنده , , T.، نويسنده ,
Abstract :
A major advance in accurate electron beam polarization measurement has been achieved at Jlab Hall A with a Compton polarimeter based on a Fabry–Perot cavity photon beam amplifier. At an electron energy of 4.6 GeV and a beam current of 40 μ A, a total relative uncertainty of 1.5% is typically achieved within 40 min of data taking. Under the same conditions monitoring of the polarization is accurate at a level of 1%. These unprecedented results make Compton polarimetry an essential tool for modern parity-violation experiments, which require very accurate electron beam polarization measurements.
