2013.07.22 Biweekly

Time and Location

2pm Eastern time

Room F326 in F-wing at JLab

Agenda

• Description of motor applications for HPS [Takashi]

• Update on ECAL HV/LV requirements [Stepan]

• Other business

Minutes

Present at JLab: Hovanes, Nerses, Krister, Stepan, F.X.

Present at SLAC: Sho, Takashi

• Takashi described the HPS-specific applications requiring stepper motor control.
  • Target (new stage)
    • 2 foils and out position. May increase the number of foils to 5.
    • 2 limit switches, low precisions, ~100um, always use reset with limit switch on power loss
    • May need to put a wire on the stick for a harp scan after first chicane
  • Collimator (new stage)
    • 2 collimators and out position. May increase to 4.
    • adjustable 50um, need to monitor some rates to find optimal position. Can implement a scan also, 
    • adjustment will need to be redone every time the collimator is retracted.
    • Hovanes wanted to have specs of the stage (uni- and bi-directional reproducibility, accuracy, smallest increment)
  • SVT motion (2 new stages)
  • SVT scan (same stages as SVT motion)
  • There are other motor applications as well: 2C21, 2C24, 2CH00, beam blocker. Total 8 motors for HPS: 2 on space frame, 6 near beam dump alcove. 

• Krister and Stepan discussed the magnet power supply controls
  • We will need the power supplies for: Moeller quads, Tagger magnet, minitorus, Pair spectrometer.
  • Krister pointed out that a lot of controls cabling, including magnet power supplies have been taken apart. Can be a major problem.
  • It might be easier to create new controls for some of them rather than to try to recreate what was there before.
  • Stepan and Krister will go into the hall to see what is still there.

• No update on ECAL HV/LV, the motherboards is still being finalized.