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COMMENT ON MCC NL LO RFoF Tx swap

1 day 2 hours ago
Log Number: 4490639Logbook(s): Body: 

The RFoF transmitter for the NL 499 LO signal has been swapped, and the LO signal in NL is restored to a similar level. During the swapping, the reference signal to the injector was interrupted. This issue was resolved , and Yan has been informed about the possible phase jump in the injector NC cavities.

The objective of the entire task is to determine whether the original RFoF transmitter is causing elevated NL gang phase variation. From now on, monitoring of this phase may help to answer this question.

plawski

cebaf drive laser got kicked off

1 day 2 hours ago
Log Number: 4490635Logbook(s): Entry Makers: shukuiBody: 

I found lasers were all off due to loss of laser RF (fig 1 and 2), not sure what happened. Asked Tomasz who said there might be RF activities going on. I brought all of them back. It will be good if CIS can get a headsup for any laser RF work.
Also, the injector tunnel is getting pretty warm.

shukui

MJA8A31 Inspection

1 day 3 hours ago
Log Number: 4490627Logbook(s): Entry Makers: banksBody: 

Took a look at the magnet. No leaks present. Interlock drop check passed. Verified LCW valves are open. All looks okay. Ready for operations.

banks

0L03-4 mod anode voltage unstable, dropping zone high voltage

1 day 3 hours ago
Log Number: 4490625Logbook(s): Entry Makers: alexsBody: 

Late entry since a PR was not put in after the initial drops. 0L03 was dropping high voltage and having trouble with low cathode current. Despite not being requested, mod anode voltage was read on the tube, and the readback was spiking between 0 and .8 kV even with the cavity 4 CPS load resistor removed. After replacing the mod anode board, the readback is now properly reading 0. We can't say for sure that it's fixed yet until the north linac gets power permit, so leaving the PR open for now. Note that the cavity is unbypassed, but the tuner is still stepped off.

alexs

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CEBAF Program
MCC Crew Chief Humphry
MCC Operators Barker, Schoene
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