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Published byErnest Leo Robertson Modified over 9 years ago
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Status and schedule for the H - source upgrade at HINS beam line HINS Meson meeting January 5 th, 2012 L. Prost (most inputs from Steve Hays & Alex Chen)
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2 H - Source Status Source reinstalled on Pre Acc test stand on 12/9/11 Has been running mostly OK since Several issues/failures had to be taken care along the way HV stability better than the last run May be because of changes we made to the extraction electrode (?) Running at low duty factor (right now, 300 s pulse at 1 Hz) is difficult (stability of the arc/plasma) because of the low temperature of the cathode (mainly) There is only so much we can do with the knobs we have Heaters, gas pressure, arc discharge power Started emittance measurements yesterday We are running with DC extractor Greg is having difficulties with his pulser I don’t think it will be ready to be tested on the Pre Acc test stand
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3 H - move main tasks Electrical Remove cables New gas valve controller installation Installation of the higher capacitance (for the 50 kV PS) Change polarity of PSs Connect heaters to HRM Install control cables and such Remove filament PS Remove leak valve system Mechanical Reference source (alignment) Alignment as-found ? Remove H + source and stand Mount and install new stand New cover
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4 H - move main tasks (cont’) Mechanical (cont’) Build new heater power supply system Install new gas valve Relocate vacuum pumps Install H - source Alignment Other miscellaneous? Assumes that the pulser won’t be ready When ready to be installed, will need dedicated run time for commissioning
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5 Time Estimates Most of the tasks are sequential i.e. not much can be done in parallel But some must or can be done before Heater power supply system (Drew – 1 week) PS, controllers, thermocouple… We have everything Fiducials for source alignment (Alignment group - ?) Electrical (Steve’s estimate) Two techs for 5 days + himself as needed Mechanical (Alex’s estimate) Two techs for 5 days + himself as needed (1 day) Alignment after installation (1 day) At face value, time in the cave: 11 days (~2 weeks) no overlap A more realistic estimate would be 3 full weeks Does not include any commissioning
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6 11-day possible schedule Feb 1 st, H - source to alignment Depends on how much time needed for alignment Simply need to be early enough Feb 3 rd, last H + run Feb 6 th, start removing H + source Mostly electrical first (cables and such), then mechanical (source and stand out) Feb 13 th, new stand installed Feb 17 th, H- source installed Includes vacuum connected (may be not pumped down) Includes all electrical connections Feb 20 th, alignment Feb 21 st, start commissioning HV => Plasma => Beam 11 days
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7 More realistic (?) schedule Feb 1 st, H - source to alignment Depends on how much time needed for alignment Simply need to be early enough Feb 3 rd, last H + run Feb 6 th, start removing H + source Mostly electrical first (cables and such), then mechanical (source and stand out) Feb 16 th, new stand installed Feb 24 th, H- source installed Includes vacuum connected (may be not pumped down) Includes all electrical connections Feb 27 th, alignment Feb 28 th, start commissioning HV => Plasma => Beam 3 weeks
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8 What’s next? Official (?) goal (?) is to have 2.1 MeV beam with adequate parameters for testing the beam absorber by the middle of the summer(?) If “6-cavity test” is not completed rapidly, what priority? When/How do we decide to switch goals? Is it even possible? What kind of effort? What would be a schedule that makes sense (for the beam absorber test to be useful)? Obviously, I don’t have a plan (otherwise, it would be here) Need to have a better grip on the current beamline before moving things around Upgrade to H - will certainly not resolve all problems
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