• laure: developed argument - re-started from top-down - focus on inner triplet; defeaters added
  • review and check which are to focus on
  • david's questions
      1. How does the UQDS react upon loss of power (assuming all the UPS etc. fail)? Will it open the quench loop? Will it fire the CLIQs/QHDSs?
        1. will open quench loop --> fast power abort
        2. units powered in redundant way, in case of full power loss of both supplies, cannot fire heaters
        3. internal power on uqds level and pdsu level is there as well - meant for diagnositc purposes but could interlock
        4. generally same for pdsu
        5. possiblity of simultaneous power outage and quench
          1. controls electronics of heaters cannot trigger without power
          2. supply lines for cliqs (UR) and heaters (UJ) same as pdsu () & uqds ()
      2. Regarding the PDSUs for D1 and D2,
        1. is it clear yet how they will look like?
          1. pretty much like inner triplet
          2. take out cliq monitoring
          3. keep separate for D1 & D2
          4. trigger fan out via PDSU or UQDS
            1. if link quenches and we have to fire all Ds
            2. then need pdsu for trigger
        2. will D1/D2 each have one PDSU?
        3. will these perform the same functions (that are relevant to D1 & D2) as in the IT (removing the CLIQ which does not exist in D1 & D2 and removing the link to the BIS) or will they also perform other functions?
          1. will need PDSU
      3. Are the conditions for the PDSU in the inner triplet to open the quench loop identical to the ones for requesting a beam dump to the BIS? In other words, will it request a beam dump both in case of spurious HDS/CLIQ firing as well as upon any QDS detecting a quench?
      4. clarify with Daniel if D1 and D2 important for this
    2. uqds upon spurious firing would saturate, but only if the condition remains for n miliseconds; at top energy 3 milisecond, but can be ten miliseconds
    3. pdsu can always dump beam via bis - but better to have active low
    4. think through big disturbance
      1. trigger heaters within few ms
      2. ups should survive for that time
      3. fuses? are rather slow
      4. supercaps - wanted to cover 100ms gap in AC
      5. question whether you could trigger the hds from its own power circuit