Today a HV test at atmosphere was performed for Each Line(s), while floating the other lines. THIS TEST AT ATMOSPHERE IS THE FIRST ONE AFTER THE FIBER GLASS WAS REMOVED.

Please note:

a). the Einzel Lens line (Y) was grounded.

b). after the fiber glass was removed the "R-U COIL" line and the "(F) Plasma" (which is the Anode line) were shorted to the BIAS voltage.

Tests performed:

1. Applied up to 32kV to "(A) OVEN -"

Sparks occurred at 32kV between the Extraction Electrode holder and the Ground Electrode.

2. Applied up to 33kV to "(B) OVEN +"

Sparks occurred at 33kV but we could not identify the spark location.

3. Applied up to 31kV to "(C) TUBE -"

Sparks occurred at 31kV between the Extraction Electrode holder and the Ground Electrode, at the top and the bottom.

4. Applied up to 30kV to "(D) TUBE +"

Sparks occurred at 30kV between the Extraction Electrode holder and the Ground Electrode, 2 spots at the bottom.

5. Applied up to 30kV to "(P-Q) COIL +"

Sparks occurred at 30kV between the Extraction Electrode holder and the Ground Electrode, all around.

6. Applied up to 30kV to "(R-U) COIL -", to "(F) Plasma" the Anode, to "(E) Cavity" or MSP, "(G) Gas", and  "(J) Heat Shield" - all these are "connected" together at the BIAS voltage.

Sparks occurred around 29-30kV at the Extraction Electrode holder and the Ground Electrode, at the bottom.

8. Applied up to 23kV to "(I) EE" - this is for the Extraction Electrode.

Sparks occurred at 23kV again at the same spot near the bottom, between the Extraction Electrode holder and the Ground Electrode.

Today a HV test at atmosphere was performed for Each Line(s), while floating the other lines.

Please note the Einzel Lens line (Y) was grounded.

Tests performed:

1. Applied up to 29kV to "(A) OVEN -"

Sparks occurred at 29kV at the Fiber Glass inside the Service Tray; and at the right side at the lines wrapped in Fiber Glass.

2. Applied up to 29kV to "(B) OVEN +"

Sparks occurred at 29kV at the Fiber Glass inside the Service Tray.

3. Applied up to 6-7kV to "(C) TUBE -"

Could not identify the sparks; it was a continuous discharge.

4. Applied up to 6-7kV to "(D) TUBE +"

Sparks/discharges occurred at 6-7kV at the Fiber Glass on the right side at the lines wrapped in Fiber Glass. We had to turn OFF the lights in the Hot Cell to identify the small sparks.

5. Applied up to 4kV to "(P-Q) COIL +"

Discharge occurred at 4kV. Could not identify it.

6. Applied up to 29kV to "(R-U) COIL -"

Sparks occurred around 27-29kV at the Fiber Glass inside the Service Tray; and at the right side at the lines wrapped in Fiber Glass.

Tom saw a spark at 27kV between the Extraction Electrode holder and the Ground Electrode.

Saw also a spark at the Ring Alumina insulator in the Service Tray, located on top of the second comb insulator with Epoxi.

7. Applied up to 27kV to "(E) Cavity or MSP, (G) Gas, (J) Heat Shield" - all these are connected together at the BIAS voltage.

Sparks occurred at 27kV at the Fiber Glass inside the Service Tray.

8. Applied up to 23kV to "(I) EE" - this is for the Extraction Electrode.

Sparks occurred at 23kV again at the same spot near the bottom screw hole, between the Extraction Electrode holder and the Ground Electrode.

9. Applied up to 27kV to "(F) Plasma"- this is for the Anode.

Sparks occurred at 26-27kV again at the same spot near the bottom screw hole, between the Extraction Electrode holder and the Ground Electrode.

Please see the first two pictures of the HV test at atmosphere done on April 19.

First picture shows a big spark between the Extraction Electrode mounting plate holder (at HV) to the Ground Electrode. Please note minimum gap between these electrodes is 7.8mm.

However the biggest visible spark was noticed at the bottom screw hole. (It is difficult to determine if at the 7.8mm gap were concomitant sparks occurring.)This spark started at 22kV and became stable above 24kV.

On April 20, 2017 Chad inspected this area with the Hot Cell camera and found a spark mark on the Extraction Electrode holder plate at the bottom screw hole. See the third picture.

Again it is very difficult with the existing Hot Cell cameras to inspect the areas where the gap is small (at 7.8mm gap between the conical surfaces of the Ground Electrode and Extraction Electrode holder)

In the second picture there are 2 small sparks: one on the top and another one on the right side at the lines wrapped in Fiber Glass. These sparks started at 20kV.

On April 21 the HV test was repeated with the Containment box ON and the sparks occurred again, at the same locations and at the same voltage.

I did a HV test on TM3 at TCS yesterday. HV Ramp up speed: 1KV per 5 minutes when below 30KV,1KV per 10 minutes from 30-36KV. There is no major spark below36 KV .  I could see  lots small and big vacuum response on IG1 and PNG2 when conditioning from 30-36 KV, especially when closing to 36 KV.  However, At 36.4 KV, There is a big continuous spark occurred. It could not be stopped until I lowed the HV to 14KV. I have to ramp up from 14 KV again.  This behavior on TM3 HV test is same as before we saw. The module can not pass 36KV at present condition.  During the test., EL is tied to 60KV bias. The HV cover on TM3 top is installed. And, Service tray  cover plate is installed on TM3.

Today TM3 HV conditioning went up to 65kV. I'll leave it here over night. ISAC OPS have instructions to keep an alarm on the HV, and ion gauge and turbo pump (TP2 tripped 3 times due to sparking).

Today TM3 was conditioned up to 50kV. At 50kV sparking started and to go higher in voltage it needs more conditioning time. Lowered it to 49kV for the night.

The TM3 containment box has been installed onto TM4. No issues, leak checked ok.

The 9 pin wiring has successfully been removed from TM3.

start of roughing now.

 start of TCS and TM3 turbo-pumps. Everything is good so far.

All water circuits are by passed on the top of TM3. Water pumps and vacuum turbo- pumps are started. Everything is ready for TM3 camera sparking check.

David Wang wrote:

All water circuits are by passed on the top of TM3. Water pumps and vacuum turbo- pumps are started. Everything is ready for TM3 camera sparking check.

 Wednesday November 30st: <br>

- 3 cameras (1 UV and 2 regular cameras)  were installed in the Service cap and the module was pumped down.  1 UV and 1 regular were placed on the East side of the module, aiming to water lines entering the Service Tray; 1 regular camera was placed on the South side of the module, aiming at the bottom of the blue insulators.

- started pumping down. <br>

Thursday, December 1st: <br>

- 1st HV test done. TM3 started sparking above 20kV. The cameras responses were consistent with the sparks. However, the screens were flickering and it was not clear if the responses were due to electromagnetic interferences; or due to cameras' gain change caused by high intensity light due to sparking.<br>

- added helium using the regulating valve. same results were found; <br>

Friday, December 2nd: <br>

- vented the module. <br>

- shielded the cameras' cables with aluminum tape. <br>

- removed 2 blue insulator (EE and HS) and shortened them by 1". They were found too long: HS blue insulator touching the horizontal HV water line; and the EE blue insulator at 2-3mm far from the HV water line; re-installed both shortened blue insulators.<br>

- changes the location of the cameras: 1 regular camera taped to the UV camera were placed South, aiming at the bottom of the blue insulators; 1 regular camera was kept on the East side of the module, also aiming at the bottom of the blue insulators. <br>

- started pumping down. <br>

Saturday, December 3rd: <br>

- 2nd HV test was done, with cameras' installed as mentioned above. results were consistent with the first test results. <br>

- added helium. results were the same. <br>

- vented and changed the location of the cameras: 1 regular camera taped to the UV camera were placed at the top of the Service Tray (South-West corner) aiming down the Service Tray; 1 regular camera was kept (its setup was not touched at all) on the East side of the module, aiming at the bottom of the blue insulators. <br>

- attempted to pump down, but the module was leaking. reopened the flanges, cleaned them, attempted again to pump down, but it showed a bigger leak. <br>

Sunday, December 4th: <br>

- the third attempt to pump down was successful (without reopening the module!). <br>

Monday, December 5th: <br>

- did the 3rd HV test with the cameras installed as described on December 3rd. same results as before were seen. <br>

- again helium was added and same results were noticed. <br>

- stopped pumps and prepared for venting to relocate the cameras lower in the Service Tray.

Aurelia Laxdal wrote:

David Wang wrote: All water circuits are by passed on the top of TM3. Water pumps and vacuum turbo- pumps are started. Everything is ready for TM3 camera sparking check.  Wednesday November 30st: <br> - 3 cameras (1 UV and 2 regular cameras)  were installed in the Service cap and the module was pumped down.  1 UV and 1 regular were placed on the East side of the module, aiming to water lines entering the Service Tray; 1 regular camera was placed on the South side of the module, aiming at the bottom of the blue insulators. - started pumping down. <br> Thursday, December 1st: <br> - 1st HV test done. TM3 started sparking above 20kV. The cameras responses were consistent with the sparks. However, the screens were flickering and it was not clear if the responses were due to electromagnetic interferences; or due to cameras' gain change caused by high intensity light due to sparking.<br> - added helium using the regulating valve. same results were found; <br> Friday, December 2nd: <br> - vented the module. <br> - shielded the cameras' cables with aluminum tape. <br> - removed 2 blue insulator (EE and HS) and shortened them by 1". They were found too long: HS blue insulator touching the horizontal HV water line; and the EE blue insulator at 2-3mm far from the HV water line; re-installed both shortened blue insulators.<br> - changes the location of the cameras: 1 regular camera taped to the UV camera were placed South, aiming at the bottom of the blue insulators; 1 regular camera was kept on the East side of the module, also aiming at the bottom of the blue insulators. <br> - started pumping down. <br> Saturday, December 3rd: <br> - 2nd HV test was done, with cameras' installed as mentioned above. results were consistent with the first test results. <br> - added helium. results were the same. <br> - vented and changed the location of the cameras: 1 regular camera taped to the UV camera were placed at the top of the Service Tray (South-West corner) aiming down the Service Tray; 1 regular camera was kept (its setup was not touched at all) on the East side of the module, aiming at the bottom of the blue insulators. <br> - attempted to pump down, but the module was leaking. reopened the flanges, cleaned them, attempted again to pump down, but it showed a bigger leak. <br> Sunday, December 4th: <br> - the third attempt to pump down was successful (without reopening the module!). <br> Monday, December 5th: <br> - did the 3rd HV test with the cameras installed as described on December 3rd. same results as before were seen. <br> - again helium was added and same results were noticed. <br> - stopped pumps and prepared for venting to relocate the cameras lower in the Service Tray.

 Monday, December 5th (Con't): <br>

- vented and changed the location of the cameras;<br>

- the UV camera was placed (tapped on an aluminum spacer and on the grounded water lines) at the middle of the Service Tray (right below the first Mykroy insulator-plate) aiming down the Service Tray (at the second Mykroy insulator-plate and water lines) ; <br>

- 1 regular camera was placed right below the UV camera, also using a spacer (taped with the camera on grounded water lines) and also aiming down the Service Tray (at the second Mykroy insulator-plate and water lines);  The spacer for this camera had 300counts on it after it was removed from TM3, after the test;<br>

- NOTE: when installing the 1st regular camera: dropped a small allen key in the Service Tray. It landed on last insulator with the epoxi and water lines, between the first HV line and the wall of the grounded Service Tray.  This insulator is down below in the Service tray. Used a magnet stick to recuperate the allen key. <br>

- the 2nd regular camera was placed at the top of the Service Tray (tapped on the grounded water lines) looking down at the first Mykroy insulator-plate and water lines. NOTE: this camera had a filter applied to its lens. <br>

- pumped down <br>

Tuesday, December 6th:<br>

- did the 4th HV test with the cameras installed as described on December 5rd Tuesday morning very early . Same results as before were seen, except that the top camera (2nd regular camera) with the filter applied to its lens was flickering less than the other 2 cameras, and for small sparks this camera was not reacting at all. <br>

- vented shortly after the 4th test and relocated the cameras for the 5th HV test (last test); <br>

- placed only 2 regular cameras in the Service Tray;<br>

- 1 regular camera was placed right below the 2nd Mykroy insulator-plate, aiming down the Service Tray at the last insulator with the epoxi and water lines (this insulator is down below in the Service tray); <br>

- the 1st regular camera was placed a level up in the Service Tray, right below the 1st Mykroy insulator-plate, aiming down the Service Tray at the 2nd Mykroy insulator-plate; <br>

- NOTE: no spacers were used<br>

- pumped down and did the 5th HV test with the cameras installed as described above in the evening; <br>

- again same results as before were seen: the camera with the filter applied to its lens was flickering less than the other camera, and for small sparks this camera was not reacting at all. <br>

- NOTE: for this last test heard sparks outside (at atmosphere) when the HV was pushed at 26kV; <br>

Wednesday, December 7th:<br>

- vented and removed the cameras from TM3. No contamination was found on the cameras and wires. <br>

- TM3 was moved to the silo.<br>

Last Friday July-15, TM3 was leak checked at TCS. All air to vacuum seals on service cap are good.  Helium pressure test on  TM3 water lines(except GE, HS, and Window) were done. Leak detector has no response at 0.0xE-9 atm.cc/sec. They are leak free.

David Wang wrote:

Last Friday July-15, TM3 was leak checked at TCS. All air to vacuum seals on service cap are good.  Helium pressure test on  TM3 water lines(except GE, HS, and Window) were done. Leak detector has no response at 0.0xE-9 atm.cc/sec. They are leak free.

Friday July 15: did HV tests (with no target installed and with the anode wire removed ). <br>

TM3 went up to 22.5kV. At this voltage it started sparking. The EL was kept at 1/2 with respect to the HV BIAS. <br>

Also HV tests were done while the EL was kept at zero V. In this case, the EL voltage was once in a while spiking  up (up to 4kV). <br>

During sparking we saw responses in the vacuum. Checked the Service Cap (with the HV Cover) in the Target Hall: we couldn't hear/see sparks there.  <br>

The HV was turned off in the same day, after 5:30pm.

After blue insulators replacement, TM3 service cap are leak checked. LD base leak rate 0.0xe-9 atm.cc/sec. I sprayed lots helium on all blue insulator seals. No leak has been found. Double checked them again, and got same result. All other seals on top of TM3 also have been checked. They are leak free. OVEN, TUBE, MSP, COIL, and EE water lines are pressurized with 70 psi helium for 3minutes each. They are good also.

On Thursday, June 29th the containment box of TM2 was removed and the optics tray re-installed and reconnected. The box was then re-installed.

Friday the window waterlines were leak checked, Nb target installed (with new fasteners, high current torqued to 130 in*lbs) target leak and electrical checked and containment box cover installed with new fasteners.

 the test was done when TM2 sit on NHC.

 TM2 with target UCx40 was disconnected in ITW and moved to NHC.

TM2 with Ta#target has been moved from SHC to ITE. the move is smooth.