e RD 15 Compton electron detector RD Requirement

e. RD 15 : Compton electron detector R&D • Requirement – 1% electron polarization measurement – Best measurement Compton electron detector at SLD ( ~0. 5%) • Request – Simulation to determine signal to background for JLEIC baseline Roman Pot – Detector R&D for faster detector ( signal at least shorter than 100 ns for e. RHIC design, improves rate capability for JLEIC ) – Test stand at JLab • Progress – Signal to background in GEMC, crosschecking with older Geant 3 simulation • Funding – Minimum : 69 K$ – Total : 189 K$ including starting detector test and test stand

Compton polarimeter Laser + Fabry Perot cavity Low-Q 2 tagger for high-energy electrons Compton photon calorimeter e- beam to spin rotator c Low-Q 2 tagger for low-energy electrons Compton electron tracking detector Luminosity monitor Compton- and low-Q 2 electrons are kinematically separated! ebeam from IPfrom Photons IP Second IP will have a similar chicane optimized for electron detection 2 Goal is to push the uncertainty of the polarimeter towards 0. 5 -1 %

Test stand • Compton polarimeter was demonstrated to achieve 1 % systematic with photon at 1 to 3 Ge. V • Prove detector technology with pulses shorter than 100 ns in beam • Crosscheck accuracy of electron detector for EIC

Simulation • To do – Implement halo – Wakefield evaluation RP electron side – Synchrotron ligh evaluation – Background with realistic beam – Full simulation with IR

Signal to background • 1 A 1 k. W 5 Ge. V only Bremsstrahlung