Plan is to resume polarized data taking.
Outstanding questions (still) are
_ tensor ed asymmetry where there is an apparent disagreement between
Genya and Chi. Presently the spin angle required to explain observed
result by GT would be 60 deg which would only possible for a small long
field. No report on false asymmetries, event by event correction to spin
angle, montecarlo
_ Dilution factor from tensor asymmetry in ee'p is now complarable with
that from vector polarization. df~60 % in both sectors with a large
error bar since it is onyl sensitive to the high pmiss region. See
vitaly on thursday for a full report
_ need to monitor ee'p events and correlate to ABS "fluctuations". Old
monitor based on charge file would not work presently
ABS:
The ABS nozzle was temperature cycled. REady for data. The ligit
monitor of the ABS intensity presently shows 5.1x10^-8 vs 6.3 this
weekend (and 6.0 last week ?). Genya also agrees that we may just
have lower intensity.
Lower ABS temperature to 82 K: will give 10 % density back and should
be safe for D2 based on hermes experience.
BEAM:
A new set of steering coils have been installed. GT reports a lower beam
lifetime (from 30 minutes). CCR will optimize beam tonight.
LADS:
Continued calibration work
BATS:
cosmic data taking
RunPlan:
After LADS and ABS we could remove wch and target covers. Plan is
to resume pol D2 running, 3 spin states flipping... no beam spin
flipper.
-- ________________________________________________________________________________ Tancredi Botto, phone: +1-617-253-9204 mobile: +1-978-490-4124 research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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