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Focus Coil Update

Focus Coil Update. Roy Preece / Tom Bradshaw / Mike Courthold STFC – RAL VC 17 th Jan 2013. Since last meeting. Gas input from bottle pack – 1.05 bar Level sensor operating but not able to communicate with the control system. System cooling over the Christmas period

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Focus Coil Update

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  1. Focus Coil Update Roy Preece / Tom Bradshaw / Mike Courthold STFC – RAL VC 17th Jan 2013

  2. Since last meeting • Gas input from bottle pack – 1.05 bar • Level sensor operating but not able to communicate with the control system. • System cooling over the Christmas period • By the New year the level was reported as being 100%. • Pressure feedback heater systems operating with a regulation of 0.005 bar. • Level reduced to 80% using the pressure regulation heaters and the exhaust poppet valve. • Pressure regulated at 1.14 bar with a gas bottle backup set to 1.05 bar. • Good news : Easily demonstrated zero boil off conditions • Good news : Control system and monitoring works well

  3. Review and Issues • Over the holiday period there were issues surrounding the remote monitoring of the system • This was complicated by the loss of air conditioning in a room somewhere …. – this took down several of the PPD computers • Other software issues concerned versions of the software running on different computers • Although the data was archived it was not always accessible through the archiver. • Where are the computers that we are using located ? What networks are they on? Who is responsible for this kit ? Over the holiday period it was difficult to resolve these issues

  4. Review and Issues • A pre powering review was held on the 8th Jan. • Risk and method statements nominally agreed (some amendments) • Pressure relief mainly reliant on the bursting disc. Relief valve with higher flow rate added to the system. • Ready to go forward with final preparations and powering. • Issues • Current lead heaters not working • Found to have very high resistance to new installed. • ON / OFF reporting on control screen sorted. • Connection to ground found on voltage tap • Problem rectified and full connectivity check carried out.

  5. Review and Issues • Powering of the coils started on 11th Jan • Quench detection system tripping due to “Step function” from the power supply controller, AMI 430. • Maximum current output set to 5A and QD system taken out of the control loop. • Current of 5A in the coils but, voltage spikes evident while the controller is trying to control the current. 0.14T seen at the centre of the magnet bore. • The cause of the “Step function” is unknown so AMI are contacted for assistance. • Testing operations were stopped at this point and the magnet was left in a safe but cold state.

  6. Review and Issues • DL engineers on site at RAL working on the controller problem today. (More up to date information in the meeting) • Earthing of the controller checked as per AMI suggestion with no change. • Further investigations into addition earth loops • Change the controller for a spare unit to ascertain if the same issue is seen. • Blah Blah Blah Blah………. • None of this was needed because the problem was found to be the instructions from AMI are incorrect and at the wrong end of the scale. 95% stability setting required NOT 20%.

  7. Plans • Ramp the magnet to 5A checking the voltage and QD operation • Ramp to 50A and hold. • Take thermal measurements to check the thermal model • Take magnetic field measurements to check the field analysis • Induce a quench in the magnet • This will check all QD, dump circuitry, logging etc • Full pressure system checks • Attach the gas bottle pack to the input • Re-cool the system • Condense He into cooling channels • LHe delivery week of 21st Jan (next week) • Refill and stabilise • Continue testing to full current in Solenoid mode – 114A • Thermal and magnetic measurements • Re-configure for Flip mode • Power to full current, with stage points, to 225A

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