[Hps] ECal commissioning with LEDs

[celentan at jlab.org]

Dear all,
in the HPS logbook:
https://logbooks.jlab.org/entry/3298763
please find a screen-shot of the on-going commissioning activity on the
HPS-ECal with the LED system.

Today, we tested with the LED system all the ECal channels, to check the
output signal and acknowledge possible problems. Roughly, most (>90%)
channel work fine.

The problems that we found will be investigated as soon as we get again
access to the detector in the Hall (today the alcove was not accessible
due to other on-going activities in the Hall).

Best,

Valeria, Holly, Marzio, Brian, Nathan, Andrea