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User name Yi Qiang
Log entry time 21:06:03 on February 10, 2009
Entry number 260371
keyword=Summary of target optics/cell work since d2n
Feb 5 swing - Feb 6 owl: Installed two more Q-wave plates for
longitudinal pumping, EPR fiber change and pickup coils adjustment. Then
started longitudinal pumping to high energy state.
Feb 6 day: EPR calibration of longitudinal pumping revealed very low
polarization ~ 30% after 12 hours pumping
Feb 6 swing: Re-adjusted the Q-wave plates for longitudinal pumping
Feb 7 day: Another EPR calibration of longitudinal pumping
Feb 7 swing - Feb 8 day: 3He in beam with longidtudinal pumping: Maximum
polarization ~ 47% ( probably 50% w/o beam )
Feb 8 swing: Rotated the field to transverse, started pumping to high
Feb 9 swing: EPR calibration of transverse pumping, maximum polarization
~ 54%, suspect oven temperature then increased the oven temperature from
230C to 240C. After about two hours, polarization is still about 55%.
Feb 9 swing - Feb 10 owl: Switch back to longitudinal pumping, average
polarization ~ 49%.
Feb 10 day: Change to transverse pumping to low energy state, trying to
see whether the low polarization was due to masing effect. Until 5:00pm,
the polarization reached 55% and the projection of maximum shows ~ 60%
Feb 10 swing: Installed rotatable Q-wave plates to longitudinal line.
A copy of this log entry has been emailed to: jpchen, moffit, brads