Difference between revisions of "GTS meeting 11 10 15"
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* Phil and Yan completed the vacuum bake to 250C for ~ 40 hour over the weekend. Gun chamber ion pump controller reads ~0.5 nA. | * Phil and Yan completed the vacuum bake to 250C for ~ 40 hour over the weekend. Gun chamber ion pump controller reads ~0.5 nA. | ||
* John installed the R350kV(HVPS side)-R30(Gun side) cable. Procedure is being written by Carlos. | * John installed the R350kV(HVPS side)-R30(Gun side) cable. Procedure is being written by Carlos. | ||
| − | * The anode is connected to a pico-ammeter through an over-current | + | * The anode is connected to a pico-ammeter through an over-current protection circuit installed by John. The pico-ammeter is in the GTS control room. |
* Rad monitors are connected, but some do not work. | * Rad monitors are connected, but some do not work. | ||
* TV signal for monitoring turbo pump pressure is operational in GTS control room. | * TV signal for monitoring turbo pump pressure is operational in GTS control room. | ||
Revision as of 14:48, 10 November 2015
- The configuration to be tested: Pure alumina (white) R30 insulator + Shed with full electrode assembly and GaAs wafer on puck # 4.
- Phil and Yan completed the vacuum bake to 250C for ~ 40 hour over the weekend. Gun chamber ion pump controller reads ~0.5 nA.
- John installed the R350kV(HVPS side)-R30(Gun side) cable. Procedure is being written by Carlos.
- The anode is connected to a pico-ammeter through an over-current protection circuit installed by John. The pico-ammeter is in the GTS control room.
- Rad monitors are connected, but some do not work.
- TV signal for monitoring turbo pump pressure is operational in GTS control room.
- Carlos, Bubba and Yan will start HV conditioning Wednesday Nov 11th after establishing maximum values for HVPS current trip limits based on experience with previous test of white R30 insulator + Shed with dummy ball that reached 375kV w/o breakdown, albeit with significant field emission.
- A pre-HV checklist is being developed now that the chamber is flanked by two gate valves, one with a 4-1/2" viewport, and the other one connecting the cathode preparation chamber. That is the way to say: " This is not a vacuum viewport breaking facility" .
- Presently, FGTSLOG is in the "retired" category, but we can still make entries, just a matter to find it in DTLite. T. Larrieu proposes to move it to the LERFLOGS under LGTSLOG.