<!-- Title: 12:09:17  Mon Oct  2 2000 -->
<!-- Crewchief: Dean Beckner -->
<!-- Op1: Steve Gordon -->
<!-- Op2: other Cryo types -->
<!-- Op3: &nbsp; -->
<!-- Op4: &nbsp; -->
<!-- Op5: &nbsp; -->
<!-- Op6: &nbsp; -->
<!-- Notes: -->
Cooldown.


<!-- Date: Mon Oct 2 13:37:29 2000 -->
<pre>Ramp tripped. supply temp went to low and PVQR could not respond quickly enough. Reset ramp.</pre>
<!-- Author: RDK -->


<!-- Date: Mon Oct 2 13:58:16 2000 -->
<pre>PVLFB is wired in.  It can be adjusted from FIX.</pre>
<!-- Author: R -->


<!-- Date: Mon Oct 2 15:42:38 2000 -->
Bill and I ran the N2 line the rest of the way to the adsorber to bring in warm N2 gas for purging and warming the system.
<!-- Author: Steve -->


<!-- Date: Mon Oct 2 15:52:03 2000 -->
Verified with arc cell that gas in tube trailer is clean. (0.05 ppm) Trying to determine source of contamination. Drilled a hole in dead ended dirty gas line and installed a valve so we could pump down the dead ended piece of pipe. Reconnected arc cell to compressor discharge and watch it. Currently it is at 38 ppm. 
Suspect possible leak from heat exchanger N2 into He on shell side. Note that Saturday when we valved off adsorber we saw no increase in contamination. After N2 was turned on the xchanger and adsorber was valved off we saw a linear increase in arc cell when reading compressor discharge.
<!-- Author: RDK -->


<!-- Date: Mon Oct 2 16:36:00 2000 -->
Pumped on dead ended dirty gas line and measured compressor discharge with arc cell. System is now steady at 38 ppm. Perhaps this was the source of the contamination. Will wait a bit and backfill with air to verify that this was the problem.
<!-- Author: RDK -->


<!-- Date: Mon Oct 2 17:02:48 2000 -->
Backfilled the dead end pipe with air. 39.82 ppm.
<!-- Author: Steve -->


<!-- Date: Mon Oct 2 17:19:50 2000 -->
GN2 flow to the nitrogen pot of the adsorber is 960 scfh.
<!-- Author: Dean -->


<!-- Date: Mon Oct 2 17:36:33 2000 -->
Arc cell rising at approx same rate as before we pumped dead ended line. Now at 42 ppm. Conclude this was the source of contamination. Decide to pump line and backfill it with He.
<!-- Author: RDK -->


<!-- Date: Mon Oct 2 17:36:55 2000 -->
<pre>Fixed logic for PV72 and removed force.  Modified mini BA power gauge enable to reset automatically.</pre>
<!-- Author: RLS -->


<!-- Date: Mon Oct 2 17:39:23 2000 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cryo-gas&action=view&page=-56&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cryo-gas&action=view&page=-56  width='250' align='top'></td><td>ppm test trend.</a></td></tr></table>
<!-- Author: Steve -->


<!-- Date: Mon Oct 2 17:51:08 2000 -->
pumped dead ended line and back filled 4 times and then capped it off. Arc cell is at 43.2 ppm
<!-- Author: RDK -->


<!-- Date: Mon Oct 2 18:20:04 2000 -->
arc cell at 44.6, cool down rate is 1.5 deg per hour. RBOBCNT_P is 248 K
<!-- Author: RDK -->


<!-- Date: Mon Oct 2 18:55:28 2000 -->
Again, we dumped ECW.   We plotted the varialble lt_ecw and found that the dump occurred for 45 minutes at 4:30 pm every 3 days.   This matches with the timer found on the following apacs page below:   The actual time of the event is also consistent with the time observed on the time remaining output of the repeat cycler block in "C3" of the page below as viewed by formation. 
 
 
system:pulse_cd_valve-cdf3.pulse_valves.pulse_cd_valves 
 
The repeat cycle timer function block had the pcton input set to 0.01.   The on time was set to 3 days.  This means that the output was true for 44.2 minutes during which time the valves were pulsing.   Note that pcton is NOT in percent on but rather a fraction.   We changed the value to 0.0001 which should give an on time of .44 minutes which will allow several cycles of the valves.
<!-- Author: Roser, kephart, and Beckner -->
<!-- Comment: Mon Oct  2 19;49;03 comment by...Roser -->
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<!-- Comment: Mon Oct  2 19;51;39 comment by...Roser -->
We tested the logic and it appeared to work as Rich had intended.  Never the less, we changed the time between occurrences from 3 days to 10 days.   This will postpone the problem until Rich Schmitt gets back from his MN trip.


<!-- Comment: Mon Oct  2 23;49;59 comment by...dean beckner -->
add 55 gallon of water back into the ecw system
<!-- Date: Mon Oct 2 21:22:31 2000 -->
<table><tr><td><a href=/cgi/elog/det-system-elog.pl?nb=cryo-gas&action=view&page=-57&button=yes target='xxx' onclick='jswindow()'; align=top><img src=/cgi/elog/det-system-elog.pl?nb=cryo-gas&action=view&page=-57  width='250' align='top'></td><td>latest pic before workspace crash.</a></td></tr></table>
<!-- Author: Steve -->


<!-- Date: Mon Oct 2 22:47:57 2000 -->
The arc cell pressure and current was adjusted at 2229 hours, so that's the bump up you see on the plot.
<!-- Author: Steve & Dean -->


<!-- Date: Mon Oct 2 23:23:28 2000 -->
Checked adsorber. N2 exhaust is not frosted at the bottom, and the vacuum pump is not "smoking" as much, but there is still no sensible reading on the Hastings gauge. 
<!-- Author: Steve & Dean -->


<!-- Date: Mon Oct 2 23:47:17 2000 -->
Magnet center is 240.8K with a rate of ~1.5K/hr. Arc cell is still climbing: 59.5ppm. 
<!-- Author: Steve -->



<!-- Date: Tue Oct 3 09:05:52 2000 -->
Adsorber helium side was vaccuum pumped to 12 microns. Filed LN2 jacket and brought adsorber online.  The arc cell reading on compressorimmediately dropped from 65PPM to less than 2 PPM and  continued to drop.
<!-- Author: R Sanders -->


<!-- Date: Tue Oct 3 09:38:37 2000 -->
opened PVNS and PVNI to 45%
<!-- Author: RDK  -->


<!-- Date: Tue Oct 3 10:24:25 2000 -->
Adsorber has been on line for one hour,  PPM level dropped rapidly to -.45ppm (essentially zero) on compressor discharge.  Valved off absorber at approximately 10:20 am.  Initial response of arc cell was to just barely change sign (+.06 ppm)but still hang around zero.  Arc cell readings being logged. 
<!-- Author: RPS -->


<!-- Date: Tue Oct 3 10:27:36 2000 -->
Modified cooldown in APACS. Ramp will now trip if RSCLR_P is 120 degrees colder than solenoid as measured by RMAGOUT_P or if RSCLR_P is 20 deg warmer than RMAGOUT_P.
<!-- Author: RDK -->


<!-- Date: Tue Oct 3 10:39:31 2000 -->
<pre>Set strain limit up to 4.4 tons</pre>
<!-- Author: RDK -->


<!-- Date: Tue Oct 3 11:14:05 2000 -->
Changed Torque LIMT in APACS from 5 to 6 Tons
<!-- Author: R Sanders -->


<!-- Date: Tue Oct 3 12:22:07 2000 -->
<pre>After leaving adsorber off, n2 level rose to 12.0 ppm. 
At 12:20, we started pumping back down the orphaned leg that 
used to return He to Acc. Division.   We thought our rate of rise went to 0 yesturday when doing this.   Lets confirm...</pre>
<!-- Author: Roser, Beckner, Schultz -->


<!-- Date: Tue Oct 3 14:05:09 2000 -->
Raised PVLOSUC set point from 1.5 to 3.0 psig (suction pressure)
<!-- Author: R Sanders -->


<!-- Date: Tue Oct 3 14:49:22 2000 -->
Closed PVXLN for test.
<!-- Author: R Sanders -->