The target hall crane has been powered down by Don today in preparation for the power shutdown over the Holidays.

 The power to the crane and controls were turned off using the power switch in the Crane Control room.  The main disconnect switch in the target hall was not touched.

All site power will be off for a period of time during the Christmas break and this removes the crane from any issues when power is restored.

The Source tray was inspected in the RH shop today by Anders, Friedhelm and Jens. The routing of the lines are satisfactory, however a design proposal to remove the ground electrode line will be made. This design will have to ensure a proper connection from the electrode to ground (using the window cooling lines). All other lines are OK at this point. Some fine adjustments are expected after brazing and soldering to maintain high voltage separation. Photos are available on DocuShare Collection-21401

 Dakine is on site to do maintenance on the chiller. The tech requested the chiller to operate.

Pete Dudley, manipulator service technician from CRL, was on site from Nov 27-30 to service the NHC Model N manipulators (See E-log entry #1578 for background).

He began by evaluating the motion selection and electric drive of the manipulator installed on the blue service cart.  This manipulator had chip A0166R01, same as the right side manipulator which had the failure described in E-Log 1578.  Pete noted that the arm was very slow to switch between the different drive directions, and had a significant lag between when the switch for motion was released, and when the motor actually stopped driving.  This was the case with all directions.  Because of this, he suspected that the right arm Z tape broke because when the manipulator reached the switch at the end of travel, the motor did not stop quickly enough causing over tension and snapping the tape.  A newer chip, A0166R04, was removed from the spare master arm (received Spring 2017), and installed into the master arm on the blue cart.  The test was repeated, and this time the motion selection and drive worked as expected.  The situation which previously caused failure was evaluated:  slave end fully extended in Z, master end fully collapsed in Z.  In this configuration the arm was moved back and forth in the Y direction.  No tape failure occurred, and the Z motion tape tension seemed normal.  Y motion drive was attempted, and was not possible, as expected.  This test was repeated in the opposite configuration (slave end fully collapsed, master end fully extended) with the same results.  Full drive speed was used for all tests.

The right side slave arm (with broken Z tape) was then removed and transported to the HCSA.  Using the bench mounted locking plate, the broken Z tape was replaced, and a full inspection and cable/tape tensioning was performed.  Pete accidentally broke the Z tape on the right side master arm while investigating the failure, which was also replaced.

The other two slave arms were also both inspected, tensioned, and tested in the same way.  Then all three were each in turn installed to the master arm #9348 on the blue manipulator transport cart where all mechanical motions and drives were tested (except X, because mounted on cart), the failure situation described above was also tested for all three slave arms.

The left side manipulator was then installed into the wall.  It was necessary to remove the lead sheilding on the thru-tube and machine it down approximtaely 0.070" in order for the arm to fit into the wall tube.  After installation, the manipulator motions and drives were tested again including the X motion, and the failure scenario situation was also re-tested.  Chad used the left side manipulator to remove and re-install the pre-filter mounted on the west side partition wall.  He also confirmed that he could reach the east wall electrical outlets and the outlets, gas fittings in front of the window.

The right side slave arm was adjusted so that the Y position was moved 1/2 turn of the shaft drive towards the window (this is the maximum adjustment possible before it hits a hard stop).  This was done so that the operator can more easily reach the outlets and air/gas connections inside the cell in front of the window.  Because both the master and slave ends protrude further out from the wall compared to the E-HD manipulators for the SHC, this modification makes the NHC manipulators feel a bit more like the SHC manipualtors for the operator.  After the adjustment, the right side slave arm was installed.  The left side slave arm was removed, adjusted the same as the right side, then reinstalled.  The spare slave arm was also adjusted in the same way.

The right side manipulator was evaluated through all mechanical motions.  We attempted to remove the A0166R04 chip from the left side, and install in the right in order to try the motion drives, however the pins had been damaged from the previous removal/install, and eventually one pin broke so this was abandoned.  CRL will ship us at least three new A0166R04 chips which should arrive in 2-3 weeks.

Upon completion of the work the location of the different arms is as follows:  Right side master #9351, Left side master #9348, Spare master #9763, Right side slave #9349, Left side slave #9764, Spare slave #9352

Shielding plug is installed onto TCS. TCS is being pumped down to keep it under vacuum for the rest of the year.

TM2 has been connected in ITW. All turbo-pumps are started. Everything works fine.

 TM#2 with Ta#55 has been moved from the conditioning station to the west target station. The field was measured on the access panel to the service chase and the field was found to be 430uSv/hr at one meter from the module.

 The spent Ta#54 target has been moved from the south hot cell to the spent target vault. It was placed in Pail #157 and put in spot #5B of the vault.

 The results of the various electrical check done on the target module on November 7th and 8th of 2017. Checks were done with the old Ta#54 target without a target and finally with the new Ta#55 target. See the attached PDF for results.

Thursday, November 09, 2017, 10:40: BIAS / EL to 30 / 15 kV. 400 uA on BIAS

Bias was stable for 1 hour. Handed over to RIB ops for heater conditioning.

TCS vacuum system and water system have been started as well. Everything looks fine.

The TM2 HS line was leak checked at SHC yesterday . 0.9xE-9 atm.cc/sec.Helium sprayed by Chad, NO leak.  It was helium pressurized at TCS this morning. Leak rat:2.5 XE-7 atm.c/sec. The result  is same as last time check. No concern.

 After extensive troubleshooting the communication fiber was found to be damaged and has been replaced by Gelo.

 TM#2 with Ta#54 has been moved from the west target station to the south hot cell.

SiC#30,ZrC#7,Ta#44,TiC#4, and Ta#41 have been moved from the spent target storage to the mini storage. See attached PDF for details of the orders of the pails in the mini vault.

On maintenance day Tuesday, the roughing of the target station could not go below 1.5 Torr. A brief troubleshooting on Tuesday was unsuccessful in determining the cause. Leak checking continued on Wednesday by David and Anders. A leak was finally found on the multi pin connector feedthrough due to the seal between the connector and flange on top of the nylon insulator. Upon re-tightening the connector, the leak could be stopped and the module pumped down to allow starting of turbo pumps.

 TM#4 with SiC#37 has been moved from the conditioning station to the east target station. A measurement was taken on TM#4 as it was being removed from the conditioning station, the location was on the side of the service tray access panel approx one metre away and the cover fully exposed, the reading was 750uSV/hr.

The spent UC#21 has been moved from the south hot cell to the spent target vault. See attached for details

Thursday, October 19, 2017, 14:20: EE configured for conditioning. HV cage locked up

Thursday, October 19, 2017, 16:46: BIAS / EL / EE at 45 / 22.5 / 0 kV

Thursday, October 19, 2017, 17:16: 30 min without sparking. Lowering to 0. Continue conditioning tomorrow.

Friday, October 20, 2017, 08:22: Resuming HV conditioning

Friday, October 20, 2017, 08:44:  BIAS / EL / EE at 45 / 22.5 / 0 kV

Friday, October 20, 2017, 09:48: No sparking. Continue conditionoing

Friday, October 20, 2017, 10:40: BIAS / EL / EE at 50 / 22.5 / 0 kV

Friday, October 20, 2017, 11:30: HV spark (at 52.5 kV) tripped TP2 and TP1s resulting in IG1S and power supplies tripping.

Friday, October 20, 2017, 13:50: Gelo is troubleshooting flickering on/off of ANODE, TGHT and TBHT power supplies.

Friday, October 20, 2017, 13:51: BIAS / EL / EE at 50 / 25 / 0 kV

Friday, October 20, 2017, 14:26: BIAS / EL / EE at 55 / 28 / 0 kV

Friday, October 20, 2017, 14:37: TP2 tripped on spark

Friday, October 20, 2017, 14:51: Gelo has determined there is a communication problem with the PLC on the HV platform. Troubleshooting continues.

Friday, October 20, 2017, 19:02: Troubleshooting did not succeed. Not able to control power supplies. Troubleshooting continue on Monday.

Monday, October 23, 2017, 09:00: After starting the TCS again today communication has been reestablished. Started heater conditioning.

Monday, October 23, 2017, 14:03: Heater ramping previously aborted and ramp down started due to ongoing PLC communication issues. TGHT and TBHT power supplies tripped on timeout around 13:45. Gelo will continue the troubleshooting.

Monday, October 23, 2017, 19:55: Switching off source after operating for 5 hours without any communication glitches detected (fiber optic communication cables swapped between HV platform and BIAS/EZL PLCs)