TCS IG1S  is switched on as well. The reason to start the pump is to prepare a possible extended TM2 conditioning at TCS caused by TH crane issue. TCS:TP1 and TP2 are not switched on for this.

TM2 was moved and connected in ITW yesterday afternoon. After roughing down, ITW turbo pumps are started. ITW TP4 can not be started to full speed. ISAC ops kept it at low speed mode with less than 1.0A current draw on pump. ITW IG1s shows red as well. I will take a look on them today when beam is off.

TH crane burning smell showed again this morning. It appeared after 1-1.5 hours of continuously using during the F308 flasks moving in TH.After a certain time of using I think the brake gap is reduced because of  thermal expansion. The main hoist and brakes work fine still. We knew these brakes gap are tight especially on west side. So, It is not surprised that this burning smell appeared again. It does not affect the safe of crane use in my view. But, The life of this brake assembly could be affected.  I would like everyone know this issue. We may need to consult Gordon crane as well. Maybe, The gap should be increased up a little bit.  On this Friday, I will use crane to transfer 30K lbs shielding blocks. It will be a good test on crane main hoist again. 

RU( coil 1), F (anode), and 60kv bias(HS, Gasline, and MSP)  are shorted together. Other lines are good.  They are measured between  individual line each other  @500V. The megga showed OL. All of  them to ground are OL @500V as well. EL is grounded during check.

During TM3 roughing down yesterday afternoon,The vacuum gauges CG1 and CG1S stopped at 1.20 torr and refused to drop down. Leak detector was used to found where the problem was. LD was in rough detecting mode and showed 2.7xE-6 atm.cc/sec as base leak rate.  Spray medium amount of helium to TM3 service top, and found this leak was on round panel of TM3 side wall. LR climbed to E-4 atm.cc/sec range on helium spraying. In my vie,One 10# socket head screw was not tightened properly after cameras job and caused this.  The TCS was vented. The panel was took off and reinstalled. O-ring on the panel  was replaced by a new one as well. Then TCS was pumped down again. The leak disappeared .  All turbo pumps on TCS and TM3 were started successfully later.

  TH crane is used for transferring five shielding blocks(30000lbs) today. All brakes work fine. Mostly, I do not need crane slow up motion for this job so during 1 hour moving, no rattle sound and burning smell has been found.  I think TH crane is good to use as we decided. 

Sparking was found this morning inside HV cover on TCS in TH while TM3 was HV conditioning at TCS. The TCS bias was set to 50KV when I found this spark. It sparks between HV cover front side wall to a KF 25 clamp on HS water terminal. The KF 25clamp is used in this situation on HS water line top because the HS line is opened inside module, and we need a vacuum seal on the top of this line.  Actually, The clap is much smaller than the corona ring on HS terminal, and the corona ring is more close to side wall. But there is a 90 degree straight corner on this clam. So the spark happened between the side wall and this 90degree corner on the clamp. We can not change the clap now since it will break vacuum. So, we decide to do HV test without HV cover installed onTM3 at TCS. A work permit is issued for  this. Lock out procedure: Document-70039 is clarified in WP.

Update TH schedule weekly to show the job process.

Aurelia and I investigated this current limit issue May 8th. First, By separating TM3 from TCS. we found the problem is on TCS side. We did a Megga test on TM3 as well. TM3 is good at 1KV megga test. After that, The insulators between TCS to ground is test. they are good which could hold 1G ohm at 1000V megga test. So the problem should be on power supply side  including power supply itself ,cables and transformer. Later, Tom and John found the TCS bias HV cable from power supply to HV chase top in faraday cage is broken down. It can not hold 5KV on HV test now. This cable should hold 100KV. But not this time. Tom also found  the adapter on Faraday cage could be designed in a better way. The broken cable was removed yesterday. John and Tom will order an exactly same cable from Glassmen.

TM3 service tray side panel is cleaned and installed back to TM3 this morning. I visually inspected service tray insulators. Nothing is changed comparing to inspection before.Nine screws are installed on  panel to hold it onto TM3.

This morning, when I prepare for today's crane check, The crane made a very strong noise without any load during the full speed up motion. I stopped the crane right away, and noticed that east side of main hoist motor area was smoking . The crane was moved to east end. And, I climbed up to the top, and found the smoke is coming form brake side, and should be produced by braking. The smell is same as before.Unless other thing is wrong,  I think Gordon crane technician has to adjust the gap to a proper distance on both side of the main hoist. I feel very uncomfortable by operating the crane this way. They have to figure out what is wrong on these new brake assembly installation.

2017-05-12. This morning , Crane technicians increased both side of main hoist brake gaps today. They found on east side brake assembly, The gap is automatically closed after some  jogging motions. Peter think this is caused by torque produced by automatic adjustment springs on brake. This torque rotate  the gap adjustment device and closed the gap.  We operate the crane for a while with 20000lbs load on it after gap adjustment. The rattling sound is still there at slow up motion.  But, The main hoist braking sound is softer and gentle comparing to past month.This sound is more close to the sound before we replaced the brake assembly. So, This adjustment could be right in my view.  They checked  gaps after 0.5 hours operation. Everything is still fixed there . No change. They suggest we keep operating the main hoist, and they will be back on next Monday check again.  I operated the main hoist up and down in different speed motion for 1 hour after they left. Everything works fine. Braking are gentle. No strange sound and smoke during up or down. I will do  more operation on Monday morning before they come. Lets see the result after their checking.  

２０１７－０５－１５　Ｔｈｉｓ　ｍｏｒｎｉｎｇ，　２０ｍｉｎｕｔｅｓ　ｏｆ　ｃｒａｎｅ　ｍａｉｎ　ｈｏｉｓｔ　ｕｐ　ａｎｄ　ｄｏｗｎ　ｔｅｓｔ　ｗｉｔｈ　ｌｏｔｓ　ｊｏｇｇｉｎｇ　ａｎｄ　ｂｒａｋｉｎｇ．　Ｔｈｅ　ｂｒａｋｉｎｇ　ｓｏｕｎｄ　ｉｓ　ｓｏｆｔｅｒ　ａｎｄ　ｇｅｎｔｌｅ．　Ｅｖｅｒｙｔｈｉｎｇ　ｗｏｒｋｓ　ｆｉｎｅ．

2017-05-15.  Gordon crane technician Peter came in during lunch time. Both side main hoist brake gaps have been checked. They are still at the same position as last Friday. The gap is not changed after operation. Peter will be back on next Monday and check everything again.  

Chad and I finished leak check on HS line with UCx target installed on it.  Base Leak rate:0.0X 10^-9 atm.cc/sec, Base pressure 0.0X 10 ^-4 torr.  Sprayed helium to VCR joints.   No leak has been found . The line will be pressurized with helium at TCS.

 Helium pressure test on TM4 HS line is done at TCS. BLR 0.0XE-9 atm.cc/sec. 70psi helium , 2 minutes. No response. The line is leak free.

Anders started TCS turbo-pumps yesterday. The TCS and TM4 pumping down is good so far. I started TCS water pumps this morning for TCS water flow check.

2017-05-17 morning:  Stopped the water pumps. The field around the TM4 is high because of spent target in SHC. The water flow measurement will be delayed to this Friday.

TM4 TP1 was found making some noise during operation this morning. The current draw was check then. It was 1.8 A which is higher than 1.0A normal range. The pump body temperature was higher by hand feeling. But,1.0 hour later when checking again, everything on the pump goes back to normal. It is still fine so far. I will watch on this pump closely.

 2017-05-19,morning.  The TM4 TP1 stopped running last night.  I tried to start it this morning. But, It can't pass 6KRMP even. I think we have to replace it.    E- fault will be issued as well.   

TM4 TP1 is replaced. TCS and TM4 was argon vented before the job.The job took about 30minutes.  I started the all turbo pumps after job. All pumps work fine. The TCS vacuum is good.     

Yasmine and I connected TM4 in ITE . All turbo pumps are started.

We do this check once a year now. Rene found a target oven reset issue during the check . He will consult with Friedhelm. The interlock check is good.

See attachments.

The results  are good. See attachment.