• Main INDEX
  • Monthly INDEX
  • PREV
  • NEXT

    User name johna

    Log entry time 05:24:08 on March 4,2006

    Entry number 165082

    keyword="quick" beam position scan

    Rate went up a little with the large raster, so we're trying to better center the beam. Vary beam position, and look at DC current:

    BCMXa,BCMXb (both with Ya=-1.1, Yb=-0.6)
    --------------------
    -1,-1 current=15.7-15.9
    -0.5,-0.5 --> 15.5-15.7
    0,0 --> 15.9-16.0
    (+1,+1) and (-2,-2) were much worse

    Keeping Xa,Xb=(-.5,-.5) and varying y:

    Ya,Yb=(-1,-.5) --> 15.7-15.9
    (-0.5,0) --> 16.0
    (-1.5,-1.0) --> 15.4
    (-2.0,-1.5) --> 15.8

    Pick final positions of:
    Xa=-0.6
    Xb=-0.6
    Ya=-1.5
    Yb=-1.0
    for the final position for the remaining checks tonight.