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eRHIC Longitudinal Polarimeter

The eRHIC longitudinal polarimeter aims to effectively detect electrons and photons with an optimized design for laser interaction. Key features include a ~2 m drift region, a good g-2 projection at the laser infrared, and facilities for UHV/XHV and ion clearing. Challenges such as avoiding imaging of long vacuum sections with gamma detectors and utilizing a last spin rotator dipole for optimal spin precession at varying GeV levels are addressed. This layout emphasizes precision in spin measurements critical for high-energy physics experiments.

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eRHIC Longitudinal Polarimeter

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  1. eRHIC Longitudinal Polarimeter • Ideally: • Detect electrons and photons • Have ~2 m drift for laser interaction region • Have “good” g-2 projection at laser IR • Do not image long (>5 m) vacuum sections with gamma detector • Provide for UHV/XHV and ion clearing at laser IR

  2. HERA Long. Pol. Layout Courtesy W. Lorenzon - University of Michigan

  3. Use Last Spin Rotator Dipole Outside IR for Tagger 90º of Spin Precession @ 7.5 GeV  5.3 º Bend 35 mr 35 mr Solenoid Solenoid 10 mr 10 mr e’ 35 mr precesses spin 22º @ 5 GeV, 45 º @ 10 GeV Not Really a Longitudinal Polarimeter 60 mr 10 mr Septum Solenoid Solenoid 10 mr 10 mr e’ 35 mr precesses spin 37º @ 5 GeV, 74º @ 10 GeV Septum Required

  4. Solenoid Solenoid Solenoid Solenoid Longitudinal Polarimeter Downstream? γ Detector IP/Detector -90 mr -10 mr 90 mr -10 mr 10 mr 10 mr e’ 5° Dipole doesn’t require Septum?

  5. Optimize Spin Rotator at 8.5 GeV?

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