20100416

Screen alignment OTR

• Optics set file 10APR16_1901.dat
• Screen position for alignment laser 9600
• Screen posttion for electron beam 9400
• beam orbit /atf/data/cbpm/raw/bpmAllLog_20100416_182345.dat
• Mirror location to find signal otr:m1x 4.15002 otr:m1y 4.35002
• Polarizer 90 deg
• Magnification factor 10.7 and pixel size 7.14 um

Background Study

Loss monitor recorded for nominal ATF2 optics with OTR screen in. See Loss Monitor Fig 1.

• HV : 1250 V
• Signal level 2.8 volts, reduced to 1.5 volts