TY  - CONF
AU  - Schneekloth, Uwe
AU  - Goerrissen, Nico
TI  - Calibration of OLYMPUS/DORIS beam position monitors
M1  - PUBDB-2014-04555
SP  - TUPF09
PY  - 2014
N1  - OA
AB  - The goal of the OLYMPUS experiment is a precise measurement of the ratio of the positron-proton and electron-proton elastic scattering cross sections in order to quantify the effect of two-photon exchange. The experiment was performed using intense beams of electrons and positrons stored in the DORIS ring at Deutsches Elektronen  Synchrotron in Hamburg, impinging on an unpolarized, internal, hydrogen gas target. An essential ingredient of the experiment is a precise determination of the luminosity, which requires a precise knowledge of the beam position of both beam species. During DORIS operation cylindrical button beam position monitors, read out by two independent electronics systems, were mounted up- and down-stream of the target chamber. After the end of operation, the readout systems were cross-calibrated. The BPMs were then calibrated using a test-stand, consisting of a wire scanner assembly. The beam was simulated by applying an RF signal to the wire. This paper describes the calibration principles and test setup, together with the results compared to the expected BPM response
T2  - Hadron Structure and QCD: from Low to High Energies
CY  - 30 Jun 2014 - 4 Jul 2014, Gatchina (Russia)
Y2  - 30 Jun 2014 - 4 Jul 2014
M2  - Gatchina, Russia
LB  - PUB:(DE-HGF)8
UR  - https://bib-pubdb1.desy.de/record/193126
ER  -