Regarding the neutron trigger for H running, I think the answer is "yes".
There should be a lot of interesting events in the n + pi+ final state
channel, with the pi+ in the left sector and the n in the right sector.
The final electron goes down the tube.
> Operator: zwart
>
> Troublesome Shift.
>
> Running polarized H after Genya switches back from Helium test.
>
> Good runs 12144,12145,12146
>
> BLTC's stop counting. Blast_Data_Alarm reports 0 scaler events being
> written. But HV GUI looks OK. Call TB who helps restart scaler app.
>
> Large asymmetry in Compton results (+90%,-50%). Larry Loncoy adjusts
> electron beam position at Compton from ~ -10 mm to ~-6 mm. Adjust laser
> steering to reoptimize backscatter rate (mostly M3). Laser spot moves down
> significantly on the video monitor in the counting bay. M1 (1st remote
> control for vertical appears not to function). The backscatter rate
> increases to ~600 Hz/mA Las. Curiously false asymmetry is now almost
> completely inverted to (~-90%,+50%). Larry adjusts beam position to
> ~-7.5mm, but false asymmetry is largely unchanged. This action does
> however optimize the brem rate on the CsI. Normalized brem rate imroves
> from ~45 --> ~75. The false asymmetry still needs attention.
>
> Should the Neutron trigger still be on if we are running Hydrogen?
>
> Then had trouble with HV IOC. The HV gui reported "restoring", but was
> frozen. Rebooted the IOC and started running again.
>
> I did not have override permission set to "off" on HV GUI. Several WC
> trips occured as the ring filled with HV on. Larry noticed and the HV was
> appropriately reset.
>
> Finally things are smooth again.
>
> Runs 12150, 12151 are good.
>
>
>
>
>
>
-- John R. Calarco Dept. of Physics Univ. of New Hampshire Durham, NH 03824 email: calarco@unh.edu phone: 603-862-2088 fax: 603-862-2998
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