<!-- Title: 00:30:03  Tue Jun 25 2002 -->
<!-- Crewchief: Steve  - owl -->
<!-- Op1: Bruce - day -->
<!-- Op2: KC - night -->
<!-- Op3: &nbsp; -->
<!-- Op4: &nbsp; -->
<!-- Op5: &nbsp; -->
<!-- Op6: &nbsp; -->
<!-- Notes: -->
Solenoid is powered, but still no beam. 


<!-- Date: Tue Jun 25 04:52:46 2002 -->
Pumping the Watt can from 4 microns.
<!-- Author: Steve -->


<!-- Date: Tue Jun 25 05:04:24 2002 -->
The magnet just slow dumped. Investigating. 
<!-- Author: Steve -->


<!-- Date: Tue Jun 25 05:22:25 2002 -->
The first out was ground fault. I'm letting the magnet discharge all the way.  I checked on the camera upstairs, and I didn't see the light cycle for the dewar neck heater, but there are electical cords in the field of view.  It could be that the neck heater blew a fuse and there is some moisture on the voltage taps coming out of the dewar neck. 
<!-- Author: Steve -->


<!-- Date: Tue Jun 25 05:28:57 2002 -->
Based on last night's hipot results, the difference is about 100 MegaOhms, so something is getting wet. 
<!-- Author: Steve -->


<!-- Date: Tue Jun 25 05:53:05 2002 -->
Bruce on duty, Started mixing argon/ethane gas into tank #2 at this time.
<!-- Author: Bruce -->


<!-- Date: Tue Jun 25 06:15:28 2002 -->
Gas  and cryo readings taken ,most all systems are in good shape the mechanical room is fine.
<!-- Author: Bruce -->


<!-- Date: Tue Jun 25 07:12:19 2002 -->
Added 28 liters of isopropyl alcohol to the isopropyl alcohol barrel.
<!-- Author: Bruce -->


<!-- Date: Tue Jun 25 07:41:33 2002 -->
<pre>Started trouble shooting the solenoid.   Used hand megger to check out the system.   Warren and I measured 42megohms to ground on both polarities at 500V.   FINE!   We then used the hipot chassis and it read 39-40 meg ohms.   Looked at all systems as best I could and see no problem.   Went t hrough the power up sequence.  Managed to get stuck twice at nim 5b chassis checkout.  Don't know why.   When I brought up the plot to see what was going on, it worked that time!  DOH!   Magnet at 1000 amps at the moment.   May be possibility for an access -- if so, I would like to go in and take a look -- make sure there are no surprises up there.</pre>
<!-- Author: RR, WB, BV -->


<!-- Date: Tue Jun 25 09:17:15 2002 -->
<pre>We were denied an access so I powered it up.   Its been up for 60 minutes now and no problem.   However, since then, TEV aborted so maybe I can still go in.   Otherwise, inspection scheduled for tomorrow. 
 
</pre>
<!-- Author: RR -->


<!-- Date: Tue Jun 25 10:19:54 2002 -->
Solenoid went into a slow dump due to a ground fault, will leave the solenoid down till Rob and Walt look at the problem.
<!-- Author: Bruce -->


<!-- Date: Tue Jun 25 10:58:04 2002 -->
Put the lead flows into standby mode.
<!-- Author: Bruce -->


<!-- Date: Tue Jun 25 12:49:24 2002 -->
WALT J. IS HERE AND MADE SOME CHECKS. ---- ADDED GROUND FAULT TAG TO HIST.COLLECT. ---- MADE PLOT PAGE. ---- POWERING UP SOLENOID TO WATCH IF IT TRIPS.--- IT DIDN'T. -- LEAVING IT "ON" --- WILL KEEP AN EYE ON IT.
<!-- Author: JIM,BV,WJ -->
<!-- Comment: Tue Jun 25 20;56;09 comment by...RR -->
<pre>In particular walt looked at the nim chassis and then looked at the power supply.   where as Rob used the megger to look across the solenoid, walt used it to look the other direction across the power supply.   He saw ~100 megohms.   So whatever the problem is, it does not show its ugly face when we are off.</pre>
<!-- Date: Tue Jun 25 13:14:35 2002 -->
Turned off the breaker on chiller #2 compressor #4 in order for compressor #3 to run properly.
<!-- Author: Bruce -->


<!-- Date: Tue Jun 25 14:52:55 2002 -->
<pre>Solenoid slow dumped again after about 60 minutes of being powered.   The historical plot showed a step function -- as if something mechanical let go.   There was no ramping up of this current.  We have seen this problem once before.   It had to do with the filters.   The laminations had come apart and under load they would move and short out.   We thought we solved the problem inserting G10 spacers.  Problem is that there are many stacks of laminations and we are not able to slide the g10 insulating sheet all the way down.   
 
To try to fix the system, we isolated both filters from the cabinet -- they were already sitting on g10 sheets, and we disconnected the case ground.   Now they are floating. 
If this does not help, we will have to isolate further. 
 
Will inspect top of dewar once we get an access later this evening.</pre>
<!-- Author: Walt and Rob -->


<!-- Date: Tue Jun 25 15:38:17 2002 -->
Put the lead flows into standby mode and started pumping down the watt can.
<!-- Author: Bruce -->


<!-- Date: Tue Jun 25 20:52:13 2002 -->
<pre>KC and I made an access to look at the solenoid problems...  We specifically looked at the following areas 
 
  Nitrogen box -- looked dry inside with good flow of n2 to it 
    (580) 
  Water hoses -- no leaks 
 
  neck heater -- set to 150F, good flow and definately hot 
 
  watt can area -- saw no evidence of any moisture other than 
                    where you expect -- vapor cooled leads  
                    etc outside the n2 box 
 
  fans blowing on neck working fine 
 
 
So, we turned lead flow back up and we will power testing the theory that the problem lies in the filter cabinet. 
   </pre>
<!-- Author: KC+RR -->



<!-- Date: Tue Jun 25 21:37:05 2002 -->
We are at full field -- lets see how long it lasts
<!-- Author: KC -->


<!-- Date: Wed Jun 26 04:31:39 2002 -->
They lost their store a little while ago but the our magnet is still going STRONG!  Oh yeah, the readings and equipment is ok.
<!-- Author: KC -->