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.

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

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

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

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

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

Start cooling of Target RFQ empty

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

Thursday, January 17, 2013, 08:16: started heating of the target, vacuum at 2.6E-7T

 Thursday, January 17, 2013, 14:55: current at 572A/6.95V (panel reading), vacuum at 6.7E-7T

Thursday, January 17, 2013, 18:40: measurements done, vacuum at 5.3E-7T, current 572V/6.94V, start cooling down

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

Edi replaced the faulty turbo pump in the mass separator section.

Roughing and turbo started

vacuum @ 9E-7T after 2.5h

The 9 Pin connector was rewired in the ISAC teststand to match the wiring in TM4

The wiring from the connection board in the HV cage to the connector (view from the target unit onto module) is now the following

      ---------------------------

  \     4     8     9     7     6    /

    \      5      1     2      x   /

            -----------------

with the pairs of wires

1,2   (kapton wire twisted pair all way)

4,5  (kapton wire twisted pair all way)

6,7  (kapton wire twisted pair inside the vacuum chamber,  other twisted pair from top of vacuum chamber to HV cage)

8,9  (kapton wire twisted pair inside the vacuum chamber,  other twisted pair from top of vacuum chamber to HV cage)

___ for completeness the wiring on top of the vacuum chamber (view from top onto the feedthrough)

      ---------------------------

  \     1     2     x     4     5    /

    \      6      7     8      9   /

            -----------------

NOTE: with this rewiring the metal screws on the PEEK 9Pin connector have been grounded using Ta foil

Thursday, March 21, 2013: there was a short in one of the lines  - most probably due to a shielding strand into the connector, has been resolved by fixation of the shielding in a position further away with Cu wire

   Thursday, March 21, 2013, 14:46: started roughing

                Target was out, visibly inspected, nothing to be seen, no short on the target - wiring of the 9Pin connector shows short circuit inside vacuum chamber

                Wires removed - short could be reproduced with the strandings of the shielding  from the kapton twisted pairs going into the peek connector

               wire shieldings now fixed to position further away with Cu wire

               all wires against ground and each other tested for holding 250V - all fine

               everything reconnected and target put in, torcked w 120 inch pounds

Thursday, March 21, 2013, 15:05 : turbos started

Thursday, March 21, 2013, 15:14: turbos at speed

Thursday, March 21, 2013, 15:17: vacuum at 1.4E-5T

Thursday, March 21, 2013, 18:01: vacuum at 1.45E-6T opening water lines - vacuum is stable

Thursday, March 21, 2013, 19:19 : vacuum at 8.6E-7T - start ramping heater to 580A / 250 A

Friday, March 22, 2013, 00:08: target is heated full way up

           setpoint 570A and 7.250V voltage limit

           readback 564.1A and 7.201V  --> needs more voltage than the normal target !

           vacuum at 1.2E-6T

Friday, March 22, 2013, 15:15: vacuum at 5.4E-7T

         preparing for HV test and mass scan

        transmission mode: Source +3V, everything else on GND: 12nA - mass scan see attachment

       suppression mode 1: Source -15V, everything else on GND: 20pA - mass scan see attachment

       suppression mode 2: Source +3V, everything else on +25V: <1pA - FC0 current while biasing see attachment

       NOTE:  the legs of the target are glowing differently, the left leg (view from the lid side onto the target unit) glows brighter, this side was open during the sintering process of the SiC and needed more alignment at the jig --> see attached picture

       NOTE2: there is a slight increase in TGHT voltage over time: in ~ 22h from 7.201V to 7.216V

Friday, March 22, 2013, 21:33 : vacuum at 4.8E-7, start ramping down

Friday, March 22, 2013, 22:47: heaters down and turned off, vacuum at 2.7E-7T

Monday, March 25, 2013, 00:15: vacuum at 1.4E-7T, IG off, turbos off

By Anders

Monday, March 25, 2013, 08:18: Venting

Monday, March 25, 2013, 08:33: Purging water lines

Monday, March 25, 2013, 08:42: Target removed

The powersupplies added to the teststand for operation of the IGLIS source have been removed from the HV cage as well as the RFQ driver.. The connections of the 9PIN connector in the HV cage have been grounded and the wire used for an voltage offset of the source has been removed.

NOTE: The Anode PS cable (used for biasing the target with a FEBIAD) is left grounded --> has to be rewired when running a FEBIAD source - Anode PS is turned off

Heated up sample 01 for the second time and measured the temperature with increasing current. Used pyrometre to measure temperature and calibrated it with the emmissivity values from cassidy