TY - CPAPER
AU - Schneekloth, U.
AU - Görrissen, N.
AU - Kube, G.
AU - Neugebauer, J.
AU - Neumann, Ru.
AU - Schmidt-Föhre, F.
TI - Calibration of OLYMPUS/DORIS Beam Position Monitors
J2 - Proc. of IBIC2014
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 un-polarized, 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 downstream 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.
PB - JACoW
CY - Geneva, Switzerland
SP - 324
EP - 326
KW - electronics
KW - experiment
KW - positron
KW - target
KW - electron
DA - 2014/10
PY - 2014
SN - 978-3-95450-141-0
UR - http://jacow.org/IBIC2014/papers/tupf09.pdf
ER -