LGD Motion

• LGD Motion

  • There are three people that are detector drivers: Eric Scott, Rob Lindenbush, Craig Steffen. Rob Gardner will be added to this list when we've shown him how the software works.

  • There must be an detector driver present in the control room, pie tower, or alcove whenever the LGD is moved.

  • The LGD can be moved by remote control (PT,CR) or by the manual control panel(ALC).

  • To move the LGD manually two people must be present, the detector driver and someone else. First, make a visual inspection of the rails and remove and obstacles. When the through-way is clear, the driver goes to the main control panel, beam left. The other person stands on the beam right side. The driver accounces "moving left/right/up down" as appropriate. Both people look (and listen) for anything unusual; binding, or whatever.

  • To move the lgd by remote, it is first assumed that the lgd drive system has been engaged according to the hall lock-up checklist

    • One of the detector drivers _must_ be present to drive the lgd. Two people must be concentrating on this task. One person watches the camera monitor at the LGD, the other operates the computer controls. The LGD can be run by remote from the pie tower or the control rooom. Both have computer consoles and camera monitors.

    • Log in to a terminal window as radphi. From ~radphi:

      urs1> source scripts/setup.jlab

    • The command "encode r" will give the position of the lgd within the experimental coordinates. The command "lgdMoveXP" is the drive command. Issuing it with no arguments gives the template:

      urs1> lgdMoveXP

      lgdMoveXP t (direction) (time)
              Move for (time) milliseconds
              (direction) is U,D,L or R
              (time) is in milliseconds
      lgdMoveXP r (direction) (distance)
              Move (distance) cm total
              (direction) is H or V
              (distance) is in cm
      lgdMoveXP a (direction) (location)
              Move LGD to (location)
              (direction) is H or V
              (location) is in cm
      

  • Always remember that +X is BEAM LEFT, +Y is up, and +Z is down beam.