Base leak rate 6 - 7 E-9 mbar-l/s

A leak was found around the 9-pin feed through.

In preparation for RFQ target and leak troubleshooting.

Tuesday, December 04, 2012, 11:04: Turbos off (vacuum at 3.8E-7 T)

Water lines purged.

Tuesday, December 04, 2012, 15:03: Venting

Tuesday, December 04, 2012, 15:32 : Vented

The RFQ heating test target was installed by Sebastian and Anders.

Tuesday, December 04, 2012, 17:26: roughing

Tuesday, December 04, 2012, 17:45: starting turbos

Tuesday, December 04, 2012, 17:55 : turbos at speed

Tuesday, December 04, 2012, 17:55 : vacuum at 3.3E-5 T

Vacuum at 4.4E-7T

Base leak rate 2 - 3 E-9 mbar-l/sec

No response above background.

Vacuum stable at 2.8E-7 T

A Sub D 9 Pin connector on a HV insulator was installed on Port Q of the target box at the teststand. The insulator is leak tested and OK, vacuum is below 2E-7 T

The feed through is connected (1to1) to the upper 9 Pin connector of the target tray. Since the existing upper 9 Pin connector was damaged from a previous FEBIAD test, this connector was replaced. For wiring 4 twisted pair Capton insulated and shielded wires (identical to ITE and TM4) of about 50cm length are used.

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 CONNCTED

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

Monday, December 17, 2012, 22:21

Connection to the HV added. The wires end in the HV cage on a screw terminal with labels 1--12. The numbers 1,2,4-9 are used in corresponding notation to the sketch above. Since 3 is not connected at all this terminal is used for grounding the wire shielding.

As cable 2 Capton isolated pairs of wire (1&2, 4&5) and two "normal" pairs for thermocouple (6&7, 8&9) reading are used. So all connections have shielded twisted pair cable, while  (6&7, 8&9)change the cable type at the 9Pin connector

new ion guide laser ion source installed. Pure target container without targetmaterial and without surface ion source.

Heat up to 580A for heat test of all components. Distance between target and repeller < 1mm

13:15 start heating TGHT, 1A per 30sec vacuum below 2E-7T

14:50 reached 200A at TGHT (1.5V readback same as frontpanel), vacuum now 2.9E-7T, proceed on to 400A

16:10 TGHT 350 A (setpoint, readback stopped at 269A) and 3.4V readback, sudden increase in vacuum from 4E-7T to 5.5E-7T and larger fluctuations, give it 10min

16:22 vacuum back to 4.4E-7T but some occasional vacuum spikes , proceed to 400A

17:00 at 400A / 4.13V, vacuum hit 2E-6T in between which delayed the heating, now decreasing, will goto 410A for half an hour and then 385A over night

Dec 12th

8:30 3.3E-7T Vac at 385A, goto 420A

8:50 7.5E-7T Vac at 420A, goto 450A

9:20 1.7E-6T Vac at 450A, goto 470A

10:00 1.5E-6T Vac at 470A / 4.5V

11:30 1.1E-6T at 520A/4.56V

Wednesday, December 12, 2012, 11:46   1.7E-6T at 550A/4.58V

Wednesday, December 12, 2012, 14:31 

     580A reached,  Vacuum dropped from 1.8E-6T to 5.8E-7T in 2h

     voltage read back is wrong as well Panel readings are 572A/6.99V (read back values in EPICS are 248A/ 4.6V) 

Wednesday, December 12, 2012, 14:47 6.5E-7T at 592A/ 7.31V (Panel readings)

Wednesday, December 12, 2012, 15:01 there is no contact of the target to HV GND (especially the repeller), the target can still be biased to 5V

Wednesday, December 12, 2012, 19:48     5.9E-7Tvacuum is slowly going down now

Thursday, December 13, 2012, 00:23   5.5E-7T, start cooling down

Short summary on results of first heating teest with the Ion Guide Ion source:

The Ion source is still in good shape, nothing was effected by the heat. Just some deposition in the repellers and the exit electrode

The capton wires used for  wiring the electrodes had some problem with heat and went black and got brittle - for the next test we will ad a Ta schield at the side of the source to prevent radiation inside the source.

Thursday, December 13, 2012, 08:38: TBHT and TGHT off

Thursday, December 13, 2012, 08:38 : Vacuum at 1.8E-7 T

Thursday, December 13, 2012, 08:38 : Turbos off

Thursday, December 13, 2012, 11:19: Venting

Thursday, December 13, 2012, 11:30: Water lines purged

Thursday, December 13, 2012, 11:41: Target removed for inspection.

Thursday, December 13, 2012, 14:36: Roughing

Thursday, December 13, 2012, 14:56 : Starting turbos

Thursday, December 13, 2012, 15:05 : turbos at speed

Thursday, December 13, 2012, 15:06 : vacuum at 2.3E-5 T

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

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.