Electrical check of the Ta test target on TM#2

Did the start of the running year electrical checks of both TM#2 and TM#4 with no target attached to either module. TM#2 was in the south hot cell and TM#4 is in the conditioning station under vacuum.

TM#4 has been moved from the conditioning station to the south hot cell.

Electrical check done on TM#4 with UC#19. See attached PDF for results.

UCx#19 has been installed onto TM4. High current fasteners torqued to 130 in lbs. Has been leak and electrical checked and is ready to leave hot cell.

Electrical check performed on TM#2 with Ta#51, see attached PDF.

 TM#3 is now in the south hot cell.

 We have a ram installed on SHC pole which is 0.5 meter to  module shielding block surface. the readings we got today during TM3 move:
at containment box center (highest reading): 3.14 msv/hr.
at bottom  of shielding blocks: 960 usv/hr.
at 1/4  of  shielding blocks height from  bottom :700usv/hr.
at 1/2 of shielding blocks height from bottom: 340usv/hr.
at 3/4 of shielding blocks height from bottom:140u/sv/hr.
   The Ram is behind the pole and measured the surface which is 90 degree right side of that opened service tray side. 

Electrical check of TM#3 with no target at the south hot cell

Found spark signs on TM3's containment on the side of the water blocks. They may be OLD or/and NEW sparking signs, but this in not determined at this moment. Please see picture: first attachment. First and second attachment show the profiles of water block and HV lines.

A video inspection of the lower service tray was performed this morning. Camera was inserted upwards into the service tray/service chase from the containment box. One potential spark mark was identified as well as epoxy not flush with insulator. Fiberglass does not extend into service tray/chase much and does not look, from initial inspection that it will be too difficult to remove.

Video can be found in docushare Document-142295

 When lifting up TM2 (20000lbs) this afternoon, TH crane has a strange noise on main hoist. The module was lift up less than 1 feet.when strange sound was noticed.  The module move was stopped right away,and module  was lowed back to SHC. The strange noise was confirmed later with SEG block six inches lifting up. Gordon crane technician will be here to tomorrow morning to investigate the problem.

containment box was re-installed onto TM3 on Monday, Left manipulator may be showing signs of eminent handle or tong cable failure.

 TM#3 has been moved from the north east silo to the south hot cell.

the containment box has been removed from TM3.

chad fisher wrote:

A video inspection of the lower service tray was performed this morning. Camera was inserted upwards into the service tray/service chase from the containment box. One potential spark mark was identified as well as epoxy not flush with insulator. Fiberglass does not extend into service tray/chase much and does not look, from initial inspection that it will be too difficult to remove. Video can be found in docushare Document-142295

 The attached picture is from the video: showing the fiber glass inside the Service Tray.

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.

Please see TM3's Updated Schedule (the current schedule) at the SHC and TCS.

For the record I am uploading TM3's Initial Schedule at the SHC and TCS.

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 attachment for TM3 May 1-15, 2017 Tentative Schedule at the SHC and TCS.