Recent Log Entries

Shunt Chassis for MXU6S03, ABIL tag #2730, Expected Removal Date changed.

Log Number: 3859050Logbook(s): Body: The following Bypassed Interlock had it's Expected Removal Date changed in the Accelerator Bypassed-Interlocks Log (ABIL) Previous Expected Removal Date: 03 Jun 2021 New Expected Removal Date: 03 Jun 2021 Who made the change: Lee Broeker Justification for the change: still developing engineering fix, shunt module is still protected by Klixon te

Shunt Chassis for MXU6R04, ABIL tag #2729, Expected Removal Date changed.

Log Number: 3859051Logbook(s): Body: The following Bypassed Interlock had it's Expected Removal Date changed in the Accelerator Bypassed-Interlocks Log (ABIL) Previous Expected Removal Date: 03 Jun 2021 New Expected Removal Date: 03 Jun 2021 Who made the change: Lee Broeker Justification for the change: still developing engineering fix, shunt module is still protected by Klixon te

V-Wien overnight soak with flipped polarity +/-20kV @ UITF

Log Number: 3859028Logbook(s): Entry Makers: chgarciaBody: 

Good performance with flipped polarity as it was also observed with nominal polarity. Vacuum level variations no thigher than 1% compared to background with +/-20kV and with -/+20kV per electrode plate biasing.

I will turn voltage off and keep the V-Wien under vacuum at UITF until ready for electrode plate gap re-alignment for better parallelism.

COMMENT ON Injector Upgrade - Phase 1 Installation (Gun to Chopper)

Log Number: 3859018Logbook(s): Body: 

Day #51, Week 11 Day 3, Wrap-Up:

AIPINJ --
* V-wien HV testing continued today with flipped polarity on
the electrodes. <1% vacuum rise with plates at +/-20kV,
where they'll soak overnight. 3859016
* CEBAF lasers configured to allow for hut->Y-chamber-
>Gun alignment
* Gun HV Interlock system documentation and
preparations for upgrades continue

Other Injector SAD Work --
* PSS upgrades continue

V-Wien HV tested with flipped polarity to +/- 20kV @ UITF

Log Number: 3859016Logbook(s): Entry Makers: chgarciaBody: 

The CEBAF V-Wien HV testing continued today at UITF, this time with flipped polarity (Left electrode plate per beam direction convention biased negative, and right electrode plate biased positive).

Following the same protocol as the yesterday's test with 'nominal' polarity, we ramped the negative voltage first to -20kV, then ramped to zero. Next the positive voltage was ramped up to +20kV and back to zero. Anf finally, starting from zero volts, both electrode plates were ramped simultaneously to 20kV.

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