Arc A ion pumps briefly railed around VIPAA04 and VIPAA05. Came back down on its own. VIPAA05 is still elevated but slowly recovering. Seems like this happens on occasion. It was previously OpsPr'd then closed. The instruction in the comment says to re-open if necessary.
The SLSP-5247-4 GaAs photocathode mounted on puck #3 has been activated with 8 yo-yo's (full-area). The puck has been inserted in the gun with the ear at about 15 degrees CCW from the vertical direction (same angle as before). At the long manipulator, this corresponds to 25 degrees.
The HV bias was set to "5" on the battery box. The picoammeter was set 200 nA Full Scale then 2 uA after during the first Cs peak.
The Cs was heated with 4.6 A (0.98 V) and vacuum went to 8 nA. The first QE Cs peak started to show up after 8 minutes.
The following cavities have been UnGSET 0:
2L12-6
Username: xgomez
Date/Time: 08-22-26_13:30:50
RF Status: Good
Tuner Status: Good
Comment: UnGSET 0 - stepped on -100k - Klystron (done with Miram curve returning cavity to initial state)
Special Instructions:
Maintenance Tag: Component: Operator Entry - See SME
The following cavities have been UnGSET 0:
2L11-2
Username: xgomez
Date/Time: 08-22-26_13:29:20
RF Status: Good
Tuner Status: Good
Comment: UnGSET 0 - stepped on -100k - Klystron Klystron (done with Miram curve returning cavity to initial state)
Special Instructions:
Maintenance Tag: Component: Operator Entry - See SME
The following cavities have been UnGSET 0:
2L10-5
Username: xgomez
Date/Time: 08-22-26_13:26:21
RF Status: Good
Tuner Status: Good
Comment: UnGSET 0 - stepped on -100k - Klystron (done with Miram curve returning cavity to initial state)
Special Instructions:
Maintenance Tag: Component: Operator Entry - See SME
The following cavities have been GSET 0:
2L12-6
Username: xgomez
Date/Time: 08-22-26_11:28:18
RF Status: Good
Tuner Status: Good
Comment: GSET 0 - stepped off +100k - Klystron (bypassing for Miram curve testing)
Special Instructions:
Maintenance Tag: Component: Operator Entry - See SME
The following cavities have been GSET 0:
2L10-5
Username: xgomez
Date/Time: 08-22-26_10:59:07
RF Status: Good
Tuner Status: Good
Comment: GSET 0 - stepped off +100k - Klystron (bypassing for Miram curve test)
Special Instructions:
Maintenance Tag: Component: Operator Entry - See SME
The following cavities have been UnGSET 0:
2L10-5
Username: xgomez
Date/Time: 08-22-26_10:24:15
RF Status: Good
Tuner Status: Good
Comment: UnGSET 0 - stepped on -100k - Klystron (unbypassing for Miram curve test)
Special Instructions:
Maintenance Tag: Component: Operator Entry - See SME
Moved Prep Chamber ion pump to a local gamma supply.
Heated puck # 3 in oven. The initial temp is 23.4 C and vacuum is 3.6 nA. Soaked between 350 and 363 C for 15 minutes. Heater at 6.0 Amp and 2.42 V. Vacuum went to 6.2 nA. When stopped soaking, degassed Cs source at 4.7 A for 10 seconds; vacuum went from to 4.0 nA to 10 nA.
Moved Prep Chamber ion pump to a local gamma supply.
Heated puck # 3 in oven. The initial temp is 23.4 C and vacuum is 3.6 nA. Soaked between 350 and 363 C for 15 minutes. Heater at 6.0 Amp and 2.42 V. Vacuum went to 6.2 nA. When stopped soaking, degassed Cs source at 4.7 A for 10 seconds; vacuum went from to 4.0 nA to 10 nA.
| Shift | Day |
|---|---|
| CEBAF Program | |
| MCC Crew Chief | Blackshaw |
| MCC Operators | Barker |
| Program Deputy | Park |
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