Difference between revisions of "June 11, 2013 Solenoid Meeting"

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Thursday June 6,2013 at 10am
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Thursday June 6,2013 at 11am
At Jefferson Lab, the meeting will be held in room ARC 231
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At Jefferson Lab, the meeting will be held in room CC F324
  
 
== Attendees ==
 
== Attendees ==
 +
C. Rode, T. Whitlatch, E. Wolin, B. Flora (via phone for short duration..sorry), E. Chudakov, J. Creel, G. Young, P. Rossi, J. Gomez, R. Ent, W. Schneider, P. Ghoshal
  
 
== Agenda ==
 
== Agenda ==
* Discuss last weeks minutes https://halldweb1.jlab.org/wiki/index.php/June_6,_2013_Solenoid_Meeting
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* Discuss last weeks minutes https://halldweb.jlab.org/wiki/index.php/June_6,_2013_Solenoid_Meeting
 
* Status of Action Items
 
* Status of Action Items
1. Incorporate quench detection balance/tests into the 140A procedure (Rev C) - George
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# Incorporate quench detection balance/tests into the 140A procedure (Rev C) - George [[Media:140A procedure.pdf]]
 
+
# Update hardware QD with dial pot and PLC with inductance algorithm - Elliot
2. Update hardware QD with dial pot and PLC with inductance algorithm - Elliot
+
# Add full resistance measurement and acceptable value to 140A procedure - George
 
+
# Identify all known buggers in the procedure for approval - George
3. Add full resistance measurement and acceptable value to 140A procedure - George
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# Clean up refrigerator and get ready for cooldown - Jonathan
 
+
# Determine if turn to turn short could have caused quench in coil 1A - Eugene
4. Identify all known buggers in the procedure for approval - George
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# Determine what is a safe current to run at using the existing refrigerator - all
 
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# <strike>Set up a meeting with all parties to get agreement on the path forward - Tim</strike>
5. Clean up refrigerator and get ready for cooldown - Jonathan
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# Write up determination of what it would take to catch a quench once it starts - Probir/George [[media:Quench propogation.pdf]]
 
+
# Write up final analysis of quench (suppositions) - George/Eugene
6. Determine if turn to turn short could have caused quench in coil 1A - Eugene
+
# Write up high current portion of procedure (Rev D) - George
 
+
# Balance Power supply for 25H - Giles
7. Determine what is a safe current to run at using the existing refrigerator - all
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# <strike>Order 2 additional burst discs - Tim</strike>
 
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8. <strike>Set up a meeting with all parties to get agreement on the path forward - Tim</strike>
+
 
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9. Write up determination of what it would take to catch a quench once it starts - Probir/George
+
 
+
10. Write up final analysis of quench (suppositions) - George/Eugene
+
 
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11. Write up high current portion of procedure (Rev D) - George
+
 
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12. Balance Power supply for 25H - Giles
+
 
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13. Order 2 additional burst discs - Tim
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#* <strike>Prepare letter for customs to prepare for exchange (Alison)</strike>
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** 15A test minus quench detector checks (magnet still resistive)
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** Smooth ramp appeared to work ok
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** Balanced GFD for 16ohm short
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** Preliminary 140A test procedure written [[Media:140A procedure rev C.pdf]]
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* Discuss path forward plan [[Media:wSchneider path forward.pdf]]
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** Probirs margin comparison [[Media:Margin comparison.pdf]]
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* Refrigerator status
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* Do we go right into high current from 140A if ready?
 
* Do we go right into high current from 140A if ready?
 
* Path Forward .......
 
* Path Forward .......
Line 47: Line 28:
  
 
== Meeting Minutes ==
 
== Meeting Minutes ==
We went through the agenda discussing last week's meeting first.
 
  
 +
We discussed the results of last week's meeting and the proposed path forward. We went through Probir's margin comparison for different currents and temperatures as well as George's latest 140A commissioning procedure. Also discussed, was whether or not the quench could be caught. It appears that the answer is no. Once it starts, at least 1 coil will completely quench based on Probir's analysis.
 +
A discussion on the required tuning of the power supply for 25H was required for the 140A and full current testing revealed that it may not be necessary for the commissioning if the smooth ramp profile keeps the voltage spikes below 300mV. 300mV can be used for the hardwire quench detector during commissioning. The data from last week's warm ramp up will be reviewed and additional ramp tests at lower rate changes will be performed warm if necessary. Eugene did not want to make the tuning changes if we did not have to.
 +
Jonathan brought forth the suggestion to bring a signal from the refrigerator if the compressors go down or other catastrophic event happens that the magnet will immediately fast dump. This is being incorporated. The refrigerator is still being cleaned and may be ready to cool down the magnet early next week.
 +
Discussion on the allowable margin to run the magnet safely yielded the following; It should be assumed that the quench of the magnet last month should be the new zero point. The new maximum running current should yield a calculated margin of at least 0.4K above the new zero (or 0.9K above Alcorn's spec). This applies to whether or not a dewar is attached. Analysis shows that 4.5K/1350A would be acceptable. Probir will calculate what temperature is needed to run at 1500A and 1360A with this margin.
 +
Discussions on the adequacy of the existing dump resister determined that the current dump resistor is adequate and changing will not necessarily help.
 +
It was also recommended that we ramp up in steps when we near higher currents to check the temperature stability and voltage. George will add this to the full current commissioning procedure.
 +
The path forward was also discussed and it was agreed that we would not start cooldown until we have a preliminary write up outlining the results of the quench analysis (including turn to turn short), dump resistor determination and maximum current/margin rationale. This is to be accepted by Bill Schneider and Bob Flora. The 140A procedure should be approved this week (at JLAB) and a preliminary high current run procedure by next week. If all is good with the 140A testing, we would go right into the high current commissioning and mag field mapping.
  
The 15A test plan was implemented through this past Monday and most items were completed with satisfactory results. Portions of the 15A test plan was not completed due to the fact that the magnet was still dominated by resistive load since the magnet is not yet at superconducting temperatures. The magnet was only brought up to 2+ amps and then brought back down. Voltage spikes were still seen on ramp up but the current ramp appeared smooth. The hardware quench detector still needed to be over-ridden when the power supply was turned on and ramped to 2+ amps and then fast dumped. This was the maximum current applied with quench detector over-ridden. It was decided that no more useful testing could be done until the magnet is at a stable, superconducting temperature. Therefore, the balancing of the quench detector and the checking for turn to turn shorts portion of the 15A test will be moved to the next set of testing when superconducting.
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== New Action Items ==
We also looked through Bill Schneider's "Path forward" and are in general agreement with this and the items discussed below should address the items outlined.
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# Complete 140A procedure (Rev C) - George  (this is in review now with some small changes needed)
 
+
# Review 140A procedure and comment - all
*The initial 140A test procedure has been written and distributed by George and awaiting additional comments. This part basically checks all the systems required during high current runs as well as the turn to turn short check and QD balancing.
+
# Update hardware QD with dial pot and PLC with inductance algorithm - Elliot
* We discussed Probir's comparison of margins using different conditions. All margins are based on the spec Alcorn used and not the short samples. From this, it looks like subcoil 1A had a margin of ~0.5K 1500A/4.6K. Using 1300A at 4.6K or 1350A at 4.5K will give a margin of ~1K.
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# Clean up refrigerator and get ready for cooldown - Jonathan
*Discussed both the hardware and PLC QDs. The known inductances from the previous 1500A run up will be used to program the PLC QD to stay balanced throughout the current ramp up. A "dial potentiometer" will be installed onto channel 3 on the hardware QD to be able to manually balance (with precision) as the current is raised. - Elliot will follow both items through.
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# Determine if turn to turn short could have caused quench in coil 1A - Eugene
* Danfysik has finally returned a quote for engineering and parts for the balancing of the power supply for 25H. The cost is $3.6K and the PR is already in the system. Giles will follow through on getting this implemented.
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# Write up quench analysis, dump resitor and max current rationale for review - George
*George will add a check of the resistance of the full magnet (minus the leads when superconducting)and acceptable readings to the procedure.
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# Review previous low current ramp for voltage spikes and perform additional low rate ramping if necessary - Giles
* After a discussion of the "buggers" (items that are changed from normal operating conditions), it was agreed that all known buggers should be put into the procedure and approved up front. Anything added later would have to be approved by the responsible engineer and/or the DSO.
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# Write up high current portion of procedure (Rev D) - George
* The refrigerator is still being worked on and Jonathan thinks it will be ready by the end of next week. Carbon and oil are being cleaned out of the system. The question remains on when to start cooldown of the magnet. Consensus is that we should wait until at least the 140A portion of the procedure is signed off and there is general consensus that we will go right into the high current testing if the 140A testing is successful. By successful, it is meant that all critical systems are working and the quench detector operates without false trips. Jonathan is concerned that this may be our last opportunity to get the magnet cold without a major overhaul to the refrigerator.
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# Balance Power supply for 25H (if necessary based on item 7)- Giles
 
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# Implement fast dump wire connections from refrigerator - Jonathan/Elliot
== Action Items ==
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# Calculate what temperature is needed to run at 1500A and 1360A with 0.9K margin.
 
+
  
 
== Path Forward ==
 
== Path Forward ==
  
1. Complete the 140A procedure including the quench balance and turn to turn short check not completed in the 15A test (to be completed and signed off by June 14)
+
# Complete the 140A procedure including the quench balance and turn to turn short check not completed in the 15A test (to be completed and signed off by June 14)
 
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# Continue repair of refrigerator (to be completed by June 17)
2. Continue repair of refrigerator and fill magnet with liquid (to be completed by June 19)
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# Write preliminary analysis of quench and rationale for dump resistor and max current (June 17)
 
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# Review of preliminary write up by Bill Schneider and Bob Flora (June 19)
3. Complete and sign off maximum current plan (to be completed by June 19)
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# Fill magnet with liquid (to be completed by June 23)
 
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# Complete and sign off maximum current plan and quench analysis(Same OSP- New procedure or New OSP?)(to be completed by June 23)
4. Perform 140A testing ( to be completed by June 26)
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# Perform 140A testing ( to be completed by June 28)
 
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# Perform High current commissioning ( to be completed by July 1)
5. Perform High current commissioning ( to be completed by June 28)
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# Map magnet (to be completed by July 9)
 
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6. Map magnet (to be completed by July 3)
+

Latest revision as of 07:10, 1 April 2015

Thursday June 6,2013 at 11am At Jefferson Lab, the meeting will be held in room CC F324

Attendees

C. Rode, T. Whitlatch, E. Wolin, B. Flora (via phone for short duration..sorry), E. Chudakov, J. Creel, G. Young, P. Rossi, J. Gomez, R. Ent, W. Schneider, P. Ghoshal

Agenda

  1. Incorporate quench detection balance/tests into the 140A procedure (Rev C) - George Media:140A procedure.pdf
  2. Update hardware QD with dial pot and PLC with inductance algorithm - Elliot
  3. Add full resistance measurement and acceptable value to 140A procedure - George
  4. Identify all known buggers in the procedure for approval - George
  5. Clean up refrigerator and get ready for cooldown - Jonathan
  6. Determine if turn to turn short could have caused quench in coil 1A - Eugene
  7. Determine what is a safe current to run at using the existing refrigerator - all
  8. Set up a meeting with all parties to get agreement on the path forward - Tim
  9. Write up determination of what it would take to catch a quench once it starts - Probir/George media:Quench propogation.pdf
  10. Write up final analysis of quench (suppositions) - George/Eugene
  11. Write up high current portion of procedure (Rev D) - George
  12. Balance Power supply for 25H - Giles
  13. Order 2 additional burst discs - Tim
  • Do we go right into high current from 140A if ready?
  • Path Forward .......

Useful Info

  • Documents available at M:\halld_engineering\Solenoid\Commissioning\Response to Quench

Meeting Minutes

We discussed the results of last week's meeting and the proposed path forward. We went through Probir's margin comparison for different currents and temperatures as well as George's latest 140A commissioning procedure. Also discussed, was whether or not the quench could be caught. It appears that the answer is no. Once it starts, at least 1 coil will completely quench based on Probir's analysis. A discussion on the required tuning of the power supply for 25H was required for the 140A and full current testing revealed that it may not be necessary for the commissioning if the smooth ramp profile keeps the voltage spikes below 300mV. 300mV can be used for the hardwire quench detector during commissioning. The data from last week's warm ramp up will be reviewed and additional ramp tests at lower rate changes will be performed warm if necessary. Eugene did not want to make the tuning changes if we did not have to. Jonathan brought forth the suggestion to bring a signal from the refrigerator if the compressors go down or other catastrophic event happens that the magnet will immediately fast dump. This is being incorporated. The refrigerator is still being cleaned and may be ready to cool down the magnet early next week. Discussion on the allowable margin to run the magnet safely yielded the following; It should be assumed that the quench of the magnet last month should be the new zero point. The new maximum running current should yield a calculated margin of at least 0.4K above the new zero (or 0.9K above Alcorn's spec). This applies to whether or not a dewar is attached. Analysis shows that 4.5K/1350A would be acceptable. Probir will calculate what temperature is needed to run at 1500A and 1360A with this margin. Discussions on the adequacy of the existing dump resister determined that the current dump resistor is adequate and changing will not necessarily help. It was also recommended that we ramp up in steps when we near higher currents to check the temperature stability and voltage. George will add this to the full current commissioning procedure. The path forward was also discussed and it was agreed that we would not start cooldown until we have a preliminary write up outlining the results of the quench analysis (including turn to turn short), dump resistor determination and maximum current/margin rationale. This is to be accepted by Bill Schneider and Bob Flora. The 140A procedure should be approved this week (at JLAB) and a preliminary high current run procedure by next week. If all is good with the 140A testing, we would go right into the high current commissioning and mag field mapping.

New Action Items

  1. Complete 140A procedure (Rev C) - George (this is in review now with some small changes needed)
  2. Review 140A procedure and comment - all
  3. Update hardware QD with dial pot and PLC with inductance algorithm - Elliot
  4. Clean up refrigerator and get ready for cooldown - Jonathan
  5. Determine if turn to turn short could have caused quench in coil 1A - Eugene
  6. Write up quench analysis, dump resitor and max current rationale for review - George
  7. Review previous low current ramp for voltage spikes and perform additional low rate ramping if necessary - Giles
  8. Write up high current portion of procedure (Rev D) - George
  9. Balance Power supply for 25H (if necessary based on item 7)- Giles
  10. Implement fast dump wire connections from refrigerator - Jonathan/Elliot
  11. Calculate what temperature is needed to run at 1500A and 1360A with 0.9K margin.

Path Forward

  1. Complete the 140A procedure including the quench balance and turn to turn short check not completed in the 15A test (to be completed and signed off by June 14)
  2. Continue repair of refrigerator (to be completed by June 17)
  3. Write preliminary analysis of quench and rationale for dump resistor and max current (June 17)
  4. Review of preliminary write up by Bill Schneider and Bob Flora (June 19)
  5. Fill magnet with liquid (to be completed by June 23)
  6. Complete and sign off maximum current plan and quench analysis(Same OSP- New procedure or New OSP?)(to be completed by June 23)
  7. Perform 140A testing ( to be completed by June 28)
  8. Perform High current commissioning ( to be completed by July 1)
  9. Map magnet (to be completed by July 9)