DQHDS lifetime monitoring meetings

Europe/Zurich
CERN

CERN

  • Tuesday 3 December
    • 11:00 12:00
      DQHDS progress meeting - 1 1h
      Speaker: David Westermann (Universitaet Stuttgart (DE))

      Charm tests

      • Results of the tests are stored in Edwards wiki page. 
      • Take a closer at measurement data to understand the signs of aging.

       

      Radiation monitoring

      • Installation of passive dosimeters planned for the future.
      • mb/mq has uqds poor man's radmon

       

      Discussion of the results

      • What is the differen between B1 and B2? --> not clear what b1 and b2 means
      • Could be the case that stuff was replaced --> history of the units must be reconstructed
        • yellow rack replacement
        • LS1 quad and dipole LS2
        • took all out and put back back again
      • on other side of IP no change
        • beginning of 2018 did some changes
        • a9 r5 for main dipole was removed
      • For he first results, data point 248 was used. --> We need to use the minimum voltage (when the current is 0).

       

      Next steps

      • Redo the analysis: Use the minimum voltage (to get holding current) and for MB, MQ look at current as well
      • Reconstruct the history: Meeting with Edward
  • Tuesday 17 December
    • 14:00 15:00
      DQHDS progress meeting - 2 1h
      Speaker: David Westermann (Universitaet Stuttgart (DE))

      History of the DQHDS

      • installed in 2005/6
      • all removed during LS1 12/13
      • put back in random places
      • same story but in LS2
      • what is b1 and b2?
        • have a file to relate which one it is
        • 99% of ipq stayed in tunnel
          • sometimes could be moved (LS/TS)
        • have voltage divider based on four resistor
        • 5% tolerance
        • whole chain of data transmission
          •  
        • for dipole 1-4
        • for ipq it is also related to beam
        • voltage measurement
      • radiation levels
      • during LS3 new DQHDS come in in IPQ
        • is HL version also going in IT
        • old ones will be used as spares