Sebastian Raeder wrote:

Friday, December 14, 2012, 14:24 Stop Turbopumps and prepare venting to insert RFQ target

Friday, December 14, 2012, 15:27 : Venting

Friday, December 14, 2012, ~ 17:00: start roughing pumps

Friday, December 14, 2012, 20:33: start turbo pumps

Friday, December 14, 2012, 20:42 : turbos at speed

Friday, December 14, 2012, 20:43 :  vacuum at 7.32E-6T

Monday, December 17, 2012, 12:53 vacuum at 1.77E-7T

Overview over the connections of the new 9Pin connector inside the vacuum and in the HV cage

1&2 : RFQ rods in the vacuum, RFQ Driver in HV cage

4: Repeller electrode, grounded in HV cage

5: Exit electrode , grounded in HV cage

6&7: thermocouple at the center block, w/o HV to OMEGA thermocouple display, with HV should be connected to GND with 1k-10kOhm (to allow a shift of the target)

8&9: not connected, grounded in HV cage

View on top of the feedthrough and the connector on the source tray (male connectors)

     __________________

    \    1     2      3      4      5   /

      \     6      7     8      9    /

          ----------------------  

1to1 connection for pins 1,2,4-9

Pin 3 is NOT CONNECTED

The pin pairs 1&2, 4&5, 6&7, 8&9 each use a line of twisted pairs

The anode PS is turned off and connected to HV common.

the Target is connected to a -18V PS at the center support (Feed through A) for a on/off test of ion suppression

NOTE: there is a shortcut target <--> HV gnd, most propably due to the thermocouple touching something after pumping.

workaround to obtain suppression for today is to put in a differnt driver for the RFQ which can be biased to positive potential.

Tuesday, December 18, 2012, ~ 13:00 start ramping the TGHT current, vacuum at 1.7E-7T

Tuesday, December 18, 2012, 15:56: @ 250A, target is glowing, center block is cooler (can be inspected with a new hole in the heatshield lid), thermocouple is reading 224C, which is definitely colder than the temp from visual insepection, reading may be corrupted from contact to Heatschield

Tuesday, December 18, 2012, 23:11: target at 600A(593A/7.35V Panel reading), vacuum was up to 1.7E-6T, now 1.34E-6T. temperature reading was 405C which is quite away from glowing. Nevertheless, the center block of the target is visibly colder than the legs, while the center support is still way colder then the block. Thermocouple readback removed from HV cage. since the is a short cut the target (thermocouple?) the RFQ can be biased to 18V for suppression. everything locked up and stat HV test.

Wednesday, December 19, 2012, 00:14: target at 600A(593A/7.35V Panel reading), vacuum at 8.5E-7T, first HV test done, up to 30kV some occasional sparks. RFQ (1MHz , 40Vpp) without bias--> no signal, RFQ -9V biased --> 1.5E-11 on TMS:FC0

Wednesday, December 19, 2012, 01:17 : vacuum at7.7E-7T, start cooling down, was ~ 2.5h at max current.

venting and inspect the target

Wednesday, December 19, 2012, 09:43: vqacuum at 1.9E-7T, stop turbos

Sources arch restared

Wednesday, December 19, 2012, 16:24:

After long power outage, everything is off except the roughing pumps. Two turbo pumps (TMSTP2 and TSGTP1B) have shown fault due to timeout, only TSGTP1B could be reset, while TMSTP2 is still showing this fault

Vacuum in Magnet section is 0.004T according to TMSCG2. Since the target chamber was vented to remove the RFQ tests target, this section is actually pumped down using the roughing pumps (water lines are blanked off)

archivers started

Wednesday, December 19, 2012, 21:43

I was now able to reset TMSTP2.

closed the roughing pumps to the target chamber, vacuum at 0.027T

Started archivers. Controls whited out.

Thursday, January 03, 2013, 11:28: TMSRP2 is noisy. Stopped.

Roughing pump inspected by Vacuum group. Will be replaced later today. See e-fault 6516

Thursday, January 03, 2013, 11:29: TSGRP1 Started

Thursday, January 03, 2013, 11:29: TSGTP1A and 1B started

Thursday, January 03, 2013, 11:38 : TSGTP1A and B at speed

Thursday, January 03, 2013, 11:38 : Vacuum at 1.3E-5 T

TMSRP2 replaced

Thursday, January 03, 2013, 15:03: TMSTP2 and 6 started

Thursday, January 03, 2013, 15:07: TMSTP2 and 6 at speed

Thursday, January 03, 2013, 15:08: Vacuum at 5 E-5 T

 Friday, January 04, 2013, 10:51: Vacuum at 3.2E-7 T

Friday, January 04, 2013, 10:52: Turbos stopped

Friday, January 04, 2013, 13:50: Venting

Friday, January 04, 2013, 15:04: Roughing

Friday, January 04, 2013, 15:24: Starting turbos

Friday, January 04, 2013, 15:33 : Turbos at speed

Friday, January 04, 2013, 15:34 : Vacuum at 1.7E-5 T

heating target for RFQ tests. Now the wiring is insulated with alumina beats and tubing and the target has the standard Ta alkali element mixture

Unfortunately I deleted some entries, so here a short summary in combination with a screenshot of the striptool

heated to 580A, vacuum increased over time from 4.8 to 5.6E-7T

HV up to 30kV - current of 37 uA - seems fine

Mass scan not possible, ops found a water leak in the magnet PS, optics around the magnet are thereofre also not available and red in EPICS

NOTE: all FC values are in reversed bias!!

source +4.5V, 2nd Rep 0V:  RFQ offs =0V, RFQ Ampl = 20V, 1 MHz (current 0.26A), locked up

 about 2E-9A at FC0

one spark observed

source -5.5V, 2nd Rep 0V:  RFQ offs =0V, RFQ Ampl = 20V, 1 MHz (current 0.26A), locked up

  about 4E-11A at FC0

source -12V, 2nd Rep 0V:  RFQ offs =0V, RFQ Ampl = 20V, 1 MHz (current 0.26A), locked up

  about 5E-11A at FC0

  two sparks observed

source +4.5V, 2nd Rep 0V:  RFQ offs =0V, RFQ Ampl = 20V, 1 MHz (current 0.26A), locked up

  about 3E-10A at FC0

source -5.5V, 2nd Rep 0V:  RFQ offs =0V, RFQ Ampl = 20V, 1 MHz (current 0.26A), locked up - done again since not sure if the restore of the tune was done properly for this

  about 4E-11A at FC0

done, source +4.5V, 2nd Rep +12V:  RFQ offs =0V, RFQ Ampl = 20V, 1 MHz (current 0.26A), locked up

   about 3E-10A at FC0

 1 spark during HV ramping

done, source +4.5V, 2nd Rep&exit +12V:  RFQ offs =+12V, RFQ Ampl = 20V, 1 MHz (current 0.26A), locked up

there is something visible <~ 2E-12A at FC0

reduced current to 550A and leave it over night.

Short summary:

suppression possible but RFQ has to be shifted, the "only source shift" mode yielded a worse suppression than expected - unfortunately no mass scans have been possible, which would help to get some information on possible effects

 Wednesday, January 09, 2013, 10:38: Turbos off. Vacuum at 1.7 E-7 T

Wednesday, January 09, 2013, 13:24 : Venting with nitgogen

Wednesday, January 09, 2013, 14:12: Target removed

Wednesday, January 09, 2013, 14:12: Roughing empty chamber

Friday, January 11, 2013, 08:36: Venting for installation of RFQ test target later today

Target installed with 120 in lbs torque on target legs and on central support.

Friday, January 11, 2013, 11:01: Roughing

Friday, January 11, 2013, 11:25: Start turbos - SR

Friday, January 11, 2013, 11:34: turbos at speed - SR

Friday, January 11, 2013, 11:35: vacuum at 1.2E-5T - SR

Started heating the target, now Silica sleevings are installed for wire insulation and the gap target -- repeller is now 0.6mm (was 0.25mm)

The optics at the teststand has been switched on, but TMS:CBC1 is not working. A fault report has been send to controls.