[Mott] Mott work summary, Feb. 10th

[Joseph Grames]

Mott work summary for Monday Feb. 10th is shown below. For those off-site you can access electronic logbook (https://logbooks.jlab.org) with your JLAB username and password to view all entries, pictures, plots, etc.

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Good progress today (a) configuring laser/injector, (b) completing detector/DAQ configuration, (c) starting systematic checkout, (d) identifying a few action items for improvement. Details follow or are in log entries.

1. Hall C laser rep rate changed to 31.1875 MHz in ISB.

2. Plan to generate TDC stop at 31.1875MHz from 15.59375 MHz sync pulse didn't work as planned, but turns out using 15.59375MHz for TDC works fine.

3. Beam recovery to FC#2 @ 6.79MeV/c straight-forward, except for delays to bugger 0L05+ valves and test ARC5 box supply.

4. Changed to different injector setup with KE=5.0MeV and crested. Scaled normal and skew quads. Some steering required, but mainly issues because 5MeV requierd cycling 3x (or maybe it wasn't cycling when requested).

5. Tested Mott setup script. Logged activity for Theo. Most actions worked, except for target motion or target video. Maybe we do this by hand?

6. Mott FSD masking setup, included changing BCM0L02 threshold for 2uA CW.

7. Degaussed Mott dump dipole.

8. Completed PMT HV calibration for E and dE detectors using 499MHz A laser.

9. Changed to 31.1875MHz C laser and completed TDC checkout. All four detector pairs now have similar time delay in TDC.

10. Wrapped up with quickie instrumental asymmetry study to get a jump start on systematic studies.

11. DAQ deadtime with ~2kHz FADC requests is ~50%; this was only ~10% in December before network change in ISB. Need to follow-up with ACE, did something happen?

12. The MAD3D00H/V coils seem to behave oddly. Horiztonal acts like a quad and Vertical acts upside-down. Will investigate during DAY shift.

13. Current and vacuum plot in Fig. 1. A laser on left, C laser on right. Vacuum trace goes up slowly. Vacuum spikes are target motion.