June 6, 2013 Solenoid Meeting

Thursday June 6,2013 at 10am At Jefferson Lab, the meeting will be held in room ARC 231

Agenda

• Discuss last weeks minutes https://halldweb1.jlab.org/wiki/index.php/May_28,_2013_Solenoid_Meeting
• Work accomplished since last meeting
  • 15A test minus quench detector checks (magnet still resistive)
  • Smooth ramp appeared to work ok
  • Balanced GFD for 16ohm short
  • Preliminary 140A test procedure written Media:140A procedure rev C.pdf
• Discuss path forward plan Media:wSchneider path forward.pdf
  • Probirs margin comparison Media:Margin comparison.pdf
• Refrigerator status
• 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 went through the agenda discussing last week's meeting first.

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.

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.