Thursday, November 29, 2012, 16:21: Roughing

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

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

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

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.

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, 14:12: Roughing empty chamber

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

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

Start cooling of Target RFQ empty

Sebastian Raeder wrote:

Start cooling of Target RFQ empty

 Tuesday, January 15, 2013, 16:09: Turbos off

Tuesday, January 15, 2013, 21:15: Start venting with nitrogen- SR

RFQ empty target installed

Wednesday, January 16, 2013, 01:05: roughing started

Wednesday, January 16, 2013, 01:34: turbos started

Wednesday, January 16, 2013, 01:43: turbos at speed

Wednesday, January 16, 2013, 01:44: vacuum at 1.7E-5T

Friday, January 18, 2013, 11:28: turbos stopped

Started roughing

Friday, January 18, 2013, 15:25: Started turbos

Friday, January 18, 2013, 15:33: Turbos at speed

Friday, January 18, 2013, 15:35: Vacuum at 1.5E-5 T

 For conductor bolt work

Monday, January 28, 2013, 12:56: Turbos off

Monday, January 28, 2013, 14:18: Venting