Accelerator Issues Raised in Hall A Parity Collaboration Meeting, April 17-18 B-Team Meeting April 29, 2009.

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Accelerator Issues Raised in Hall A Parity Collaboration Meeting, April 17-18 B-Team Meeting April 29, 2009

Upcoming Parity Experiments Hall Start Energy (GeV) Current (µA) Target APV Charge Asym (ppm) Position Diff (nm) HAPPEx-III A Aug 09 3.484 85 1H (25 cm) 16.9±0.4  PV-DIS Oct 09 6.068 2H 63±3 PREx March 10 1.056 50 208Pb (0.5 mm) 500±15 (ppb) 0.1 2 QWeak C May 10 1.162 180 (35 cm) 234±5

Accelerator Issues HAPPEx III: Transverse Beam Polarization < 1%: Monitor Horizontal Polarization (Precession Stability of 1 degree): Spin-dance: measure polarization in Injector and Hall A Monitor beam energy and linac asymmetry Measure up-down single-spin beam asymmetry in Hall A → tweak Wien angle once a week Monitor Vertical Polarization: Use 5 MeV Mott Measure Longitudinal Polarization to 1%: use Compton and Moller Polarimeters 0.1 nA for calibration Revive or upgrade Beam x, y, E Modulation. May need Current Modulation: 10% at 10 Hz, can we do it? 30 Hz Helicity Reversal

PVDIS: 85 µA on 25 cm liquid deuterium at 6.068 GeV: low beam-trip rate Transverse Beam Polarization ??? Measure Longitudinal Polarization to 1% 30 Hz Helicity Reversal PREx: Transverse Beam Polarization < 1% Double Wien 0.1 nA for calibration 240 Hz Helicity Reversal (Line-Locked)

QWeak: 180 µA on 35 cm liquid hydrogen: low beam-trip rate Transverse Beam Polarization < 5 % (Precession Stability of 3 degrees) Measure Longitudinal Polarization to 1% 0.1 nA for calibration 1 kHz Helicity Reversal