TY - CPAPER
AU - Sikora, J.P.
AU - Calvey, J.R.
AU - Crittenden, J.A.
TI - Cross-Calibration of Three Electron Cloud Density Detectors at CesrTA
J2 - Proc. of IBIC2014
AB - Measurements of electron cloud density using three detector types are compared under the same beam conditions at the same location in the Cornell Electron Storage Ring (CESR). Two of the detectors sample the flux of cloud electrons incident on the beam-pipe wall. The Retarding Field Analyzer (RFA) records the time-averaged charge flux and has a retarding grid that can be biased to select high energy electrons. The Shielded Button Electrode (SBE) samples the electron flux without a retarding grid, acquiring signals with sub-nanosecond resolution. The third detector uses resonant microwaves and measures the electron cloud density within the beam-pipe through the cloud-induced shift in resonant frequency. The analysis will include comparison of the output from POSINST and ECLOUD simulations of electron cloud buildup. These time-sliced particle-in-cell 2D modeling codes – simulating photoelectron production, secondary emission and cloud dynamics – have been expanded to include the electron acceptance of the RFA and SBE detectors in order to model the measured signals. The measurements were made at the CESR storage ring, which has been reconfigured as a test accelerator (CesrTA) providing electron or positron beams ranging in energy from 2 GeV to 5 GeV.
PB - JACoW
CY - Geneva, Switzerland
SP - 722
EP - 726
KW - electron
KW - simulation
KW - detector
KW - photon
KW - resonance
DA - 2014/10
PY - 2014
SN - 978-3-95450-141-0
UR - http://jacow.org/IBIC2014/papers/thcxb1.pdf
ER -