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MERIT status

Detailed maintenance log from A. Fabich at CERN, covering primary and solenoid temperatures, optics repair, mercury loop, and system cooling cycles. Recommendations and actions for future maintenance.

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MERIT status

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  1. MERIT status Fabich CERN VRVS 9th Oct. 2007 A. Fabich, CERN, VRVS 9th Oct 2007

  2. Logbook • Monday 8 Oct, morning: • Hg primary at 77 deg C • Solenoid at 150 K typically • Monday afternoon: access • Optics repaired • Mercury loop closed (without Allen screws) • Set point at 30 degC (primary) and 20 degC (secondary); secondary temperature sensor at downstream end (cone/outside). • Monday evening: • cooling initiated to 90 K (at 10-20 % LN2 filling level) • Tuesday 9 Oct, morning (6:30): • Reached 90 K • Mercury stabilized at 20-30 deg C • Tuesday afternoon (14:00-14:30): • Nominal cooling cycle with 100% filling level and emptying A. Fabich, CERN, VRVS 9th Oct 2007

  3. Frontend during cryo-cycle 11am 2:30pm 2:55pm 4:10pm A. Fabich, CERN, VRVS 9th Oct 2007

  4. Temperature readings A. Fabich, CERN, VRVS 9th Oct 2007

  5. Recommendations and future actions • Wednesday afternoon: Mercury test drive • Allen screws not fixed. Issue? • Front screw not in place. Issue? • Thursday afternoon: access ~2h • Fine adjustment of optics • 10 minutes opening primary (all) • 30 minutes last adjustments for optics (HP) • 20 minutes closing primary (all) • 60 minutes putting system in nominal position (AB/ATB, transport) • Verify vacuum • how to open valve at lower solenoid? • Connect solenoid power • Assure feed-throughs without ice/water. This causes short-circuits. • HIPOT test • Cleaning of the area. A. Fabich, CERN, VRVS 9th Oct 2007

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