TM#3 with NiO#2 electrical check at conditioning station under vacuum, see pdf for details.

Yesterday the TBHT was ramped to 250 amp and the TGHT was ramped to 440 amps. Attached is the data from that run the strip tool that had this screen shot crashed but it can be recreated with the data. The TBHT ps was not reading back accurate results as such there are large steps in current or voltage or some instability for no apparent reason. In addition to this the ramping program is still not working so the ramping was a very manual process. The strip tool was left running over night, I have attached a screen shot of the the run. You will notice there are changes in vacuum that corresponds to changes in the TGHT and the TBHT voltage. Anders and myself used the archiver to plot the data with TS6 (TS3 would be better and I will have it added to the achiver), the changes in voltage and vacuum match perfectly with the compressor coming on and off. This should be investigated and possibly the temperature range of the cycling of the compressor reduced.

I have compiled the e-mail comments from people involved in High-Power Conditioning of TM3 w/ the new Rev 3 source tray and NiO#2 since Bevan Moss' last log on October 2nd below:

On October 2nd at 6:35pm Friedhelm Ames wrote:
TM3 heaters have been tested already yesterday in the conditioning station. Current and voltage readings were in the normal operating range.
The heaters were kept on over the night and no changes except a slow improvement in the vacuum has been seen. Today the high voltage was started. A high bias current of up to 150 micro Amps at 10 kV and an oscillation of the current with a frequency of about 3/minutes has been seen. Going higher in voltage resulted in an erratic behavior. After a visual inspection in the target hall some water leakage on top of the module was detected. it could be traced to 2 of the water connectors. They have been replaced. After this the high voltage current was down to normal values and the oscillation disappeared. With the heaters off the voltage could be raised to 22 kV, after which sparking occurred.
Earlier with the heaters on the functioning of the source has been tested. Extracted beam could be seen on the Faraday cup and the dependance on both the anode voltage and the coils could be verified.
One of the steerer plates (bottom) appears to have a short. As there is some redundancy in the steering elements in the target station optics, I don't believe this will effect the beam delivery very much.
A full test of all the source systems is planned for tomorrow including a careful attempt to rise the high voltage to a higher value. For the acceleration of 10C we will need 20.4 kV.

On October 3rd at 9:32am Bevan Moss wrote:

FYI Module is holding 24kV with zero sparks as of yet  I will continue with updates as I go

On October 3rd at 10:18am Bevan Moss wrote:

Sparking started at ~28kV I have had to dial it back to 22kV to hold stable voltage. I will continue with updates.

On October 3rd at 11:17am Bevan Moss wrote:

Sparking has forced the voltage down to 20kV. Friedhelm has asked me to turn everything on and start ramping the heaters.

On October 3rd at 4:15pm Bevan Moss wrote:

The heaters have been brought online and the Bias raised to 25kV. It has been sitting there for the last 10 minutes with 1 spark during this time. All other PS are on and beam is being extracted.

On October 3rd at 4:37pm Bevan Moss wrote:

Sparking has just occurred and the Vacuum is now getting worse significantly faster. Voltage was lowered to 21KV where it has been stable for the last 5 minutes. I am going to turn off the HV leave the module overnight with the heaters on. Hopefully we will have good Vacuum again in the morning.

On October 4th at 2:20pm Bevan Moss wrote:

I have finished completing another complete leak test on the module and it is leak tight. Once the heaters were turned off the vacuum did improve it is currently sitting at 9.3 x 10^{^-7} Torr in the service cap, 5.71 x 10^{^-6} Torr in the diagnostics box and 4.0 x 10^{^-6} in in the secondary.  I have raise the bias voltage and it can hold 20kV for 5 minutes but did have 1 spark. At 22.5kV it appears to be doing some conditioning as the current is unstable. I would not recommend moving TM3 to ITE on Monday until we can establish that the module can hold 25kV for at least 1 hour preferably with the heaters on. I have left the turbo pumps running in case there is more testing you would like to do. If you choose to move to ITE on Monday please have someone stop the turbo pumps otherwise I must wait an hour before venting on Monday. The TCS laptop on my desk should not have the screen saver come on so TCS can be operated through it.

Here is the change in the TCS vacuum after heaters were turned off earlier today:

2:20 pm readings

TCS:IG1 (service cap) 9.3 x 10^{^-7} Torr

TCS:IG2 (diagnostics box) 5.71 x 10^{^-6} Torr

TCS:IG1S (secondary vacuum) 4.0 x 10^{^-6} Torr

7:17 pm readings

TCS:IG1 (service cap) 8.69 x 10^{^-7} Torr

TCS:IG2 (diagnostics box) 5.0 x 10^{^-6} Torr

TCS:IG1S (secondary vacuum) 3.38 x 10^{^-6} Torr

IG1 8.0 e-7 T

IG1S 2.5 e-6 T

IG2 4.3 e-6 T

I will start the high voltage now

high voltage conditioning was carried out over the day up to 24 kV. i will leave it at 20 kV over night. Current is at 22 micro Amps, heaters off.

vacuum: IG1 7.7e-7

IG2 4.07 e-6

IG1sS 2.2 e-6

The high voltage was sparking several times during the night. It may be correlated with the cycling of the cooling water temperature and conductance.

vacuum levels at 11:00

IG1 7.5e-7 T

IG2 3.9e-6 T

IG1s 2.0 e-6 T

heaters have been ramped up to TGH 580 A, TBHT 250 A,

anode 100 V 5.3 mA, coil 50 A Faraday cup 50 nA bias 20 kV EL 6 kV

vacuum

IG1 7.9e-7

IG2 4.5e-6

IG1s 2.2e-6

All power supplies tripped on high conductivity of the cooling water < 5 MOhm, It is not clear if this was caused by a spark or vice versa. According to the strip tool for this signal the resistance of the water went up. There might be a fault in this signal. I do not have permission to force this signal so I keep the heaters off. We should revisit the interlock conditions, this signal should not be included in the interlocks for the heaters. Both target and tube seem to be still o.k. As I do not want to destroy the target I keep the heaters off and restart the high voltage only.

vacuum readings before stopping

IG1: 7.4e-7 T

IG2 3.8 e-6 T

IG1S 1.95 e-6 T

TM#3 has been moved from the conditioning station to the east target station, move went well.

 Blocks 1-4 have been moved from ITW to ITE. Block 5 was moved to a storage area as it will be in the way of the harp repair. Danka took air samples and found 200 counts of alpha on the air samples but nothing on the swipes. It is recommended that resporators be worn while blocks are being lifted and lowered. She will check the monitor tomorrow to confirm it is behaving as it should.

as measured today in the electrical room by David and Anders

with TM4 in ITW as measured today in the electrical room by David and Anders.

with TM4 in ITW as measured today in the electrical room by David and Anders.

TM3 has been disconnected this morning and  purged all HV water lines. I found the power plug for all turbo pump fans wasnt connected  during the last run. That maybe the one of the reason on that ITE TP3 failure.

TM#3 with NiO#2 moved from ITE to the south hot cell.

NiO#2 has been removed from TM3

TM#3 with no target has been moved from the south hot cell to the north east silo.

The target was inspected by Chad and Anders in the Hot Cell. Electrical megger tests were done during the assembly. It was found that Insulators No 3 (ITD0311) and No 2 (ITD0310) failed to hold voltage after the run.

EE to HS was measured OL at 1000  V.

Photos can be found on DocuShare

TM#3 with no target has been moved from the north east silo to the south hot cell.