Can we have each shift report in the shift summary the normalized rate
for the major events in the experiment? This requires establishing
canonical cuts for say (e,e'p) and (e.e'd). This is a vital quality
control parameter of the experiment. It will be sensitive to both target
thickness and wire chamber efficiency.
Richard
On Tue, 30 Mar 2004, Tancredi Botto wrote:
>
> 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.
>
>
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