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Electron polarisation measurement using a Fabry-Perot cavity at HERA |
| Reference |
Z.Zhang, to be presented at EPS 2001, July 2001 |
| Document |
Conference paper
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| Contact |
Fabian Zomer, Zhiqing Zhang |
| Abstract |
A new Compton longitudinal polarimeter for HERA is under construction. It comprises a Fabry-Perot cavity located inside the electron beam pipe. A continuous laser power of 5 kW can thus be achieved leading to a backscattered photon rate of roughly one per bunch crossing. This 'few photon mode' will enable a very precise determination of the calorimeter response function together with very large photon statistics. A measurement of the electron beam polarisation at the per mille level is expected. |
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