A High Precision Fabry-Perot Cavity Polarimeter at HERA
S. Baudrand, M. Bouchel, V. Brisson, R. Chiche, M. Jacquet, S., Kurbasov, G. Li, C. Pascaud, A. Reboux, V. Soskov, Z. Zhang, F. Zomer, M., Beckingham, T. Behnke, N. Coppola, N. Meyners, D. Pitzl, S. Schmitt, M., Authier, P. Deck-Betinelli, Y. Queinec, L. Pinard
TL;DR
This paper describes a high-precision Fabry-Perot cavity polarimeter installed at HERA, capable of measuring electron beam polarization with 2% statistical and 1% systematic uncertainties, using high-intensity laser enhancement.
Contribution
The paper introduces a novel high-precision polarimeter employing a Fabry-Perot cavity with laser power enhancement for real-time electron beam polarization measurement at HERA.
Findings
Achieved 2% statistical precision per bunch per minute.
Systematic uncertainty reduced to 1%.
Demonstrated stable high-power laser enhancement within the cavity.
Abstract
A Fabry-Perot cavity polarimeter, installed in 2003 at HERA for the second phase of its operation, is described. The cavity polarimeter was designed to measure the longitudinal polarisation of the HERA electron beam with high precision for each electron bunch spaced with a time interval of 96ns. Within the cavity the laser intensity was routinely enhanced up to a few kW from its original value of 0.7W in a stable and controllable way. By interacting such a high intensity laser beam with the HERA electron beam it is possible to measure its polarisation with a relative statistical precision of 2% per bunch per minute. Detailed systematic studies have also been performed resulting in a systematic uncertainty of 1%.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.