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

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

doi:10.1016/s0168-9002(00)01049-4

Cited by 45 publications

(33 citation statements)

References 7 publications

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“…The electronics was triggered when the amplitude of a signal recorded in the PMT coupled to that central crystal exceeded a preset threshold value. The state (Cavity ON/Cavity OFF) of a recorded event is determined by the photon beam diagnostics outside the cavity and by the cavity-locking feedback parameters [6]. The first event selection imposed a minimum current of 5 µA and variations smaller than 3 µA within each run as well as minor cuts to account for malfunctions of the experimental setup.…”

Section: Data Taking and Event Preselectionmentioning

confidence: 99%

“…The Fabry-Perot cavity [5], comprising two identical high-reflectivity mirrors, amplifies the photon density at the Compton Interaction Point (CIP) with a nominal gain of 7000. The initial laser beam (NdYAG, 300 mW, 1064 nm) is locked on the resonant frequency of the cavity through an electronic feedback loop [6]. The optical cavity, enclosed in the beam pipe, is located at the center of a magnetic chicane (16 m long), consisting of 4 identical dipoles.…”

Section: Introductionmentioning

confidence: 99%

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First electron beam polarization measurements with a Compton polarimeter at Jefferson Laboratory

et al. 2002

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A Compton polarimeter has been installed in Hall A at Jefferson Laboratory. This letter reports on the first electron beam polarization measurements performed during the HAPPEX experiment at an electron energy of 3.3 GeV and an average current of 40 µA.The heart of this device is a Fabry-Perot cavity which increased the luminosity for Compton scattering in the interaction region so much that a 1.4% statistical accuracy could be obtained within one hour, with a 3.3% total error.

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Section: Data Taking and Event Preselectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

First electron beam polarization measurements with a Compton polarimeter at Jefferson Laboratory

et al. 2002

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“…The photon density is amplified with a Fabry-Perot cavity of very high finesse which provides a power of 1700 W of IR light at the Compton interaction point. This performance, unequalled in a particle accelerator environment, results in a statistical accuracy for a polarization measurement below 1% within an hour at 4.6 GeV [3]. This number scales with the inverse of the beam energy.…”

Section: Introductionmentioning

confidence: 99%

Accurate measurement of the electron beam polarization in JLab Hall A using Compton polarimetry

Escoffier

Bertin

Brossard

et al. 2005

Nuclear Instruments and Methods in Physics Research Section A:

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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 µA, 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.

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“…It is composed of a 0.85 m long optical Fabry-Perot cavity which contains the photon beam [63,64]. A magnetic chicane of four dipoles is used to deflect the electron beam from the regular beam path to the cavity axis.…”

Section: Compton Polarimetermentioning

confidence: 99%

Electroproduction of neutral pions in the Hall A at the Jefferson Laboratory; Electroproduction de pions neutres dans le Hall A au Jefferson Laboratory

Fuchey

2010

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

Cited by 45 publications

References 7 publications

First electron beam polarization measurements with a Compton polarimeter at Jefferson Laboratory

First electron beam polarization measurements with a Compton polarimeter at Jefferson Laboratory

Accurate measurement of the electron beam polarization in JLab Hall A using Compton polarimetry

Electroproduction of neutral pions in the Hall A at the Jefferson Laboratory; Electroproduction de pions neutres dans le Hall A au Jefferson Laboratory

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