GISAXS @ D-line: Procedures

Switch to CCD mode

• move beamstop to bsx=0, bsz=1  >  wbs; mv bsx 0 bsz 1
  
• verify that rod beamstop is in the reflected beam  >  mv samth 0.1; dscan bsx -2 2 20 1
  
• close shutter  >  shclose
• enable ccd macros  >  ccdon
• go into hutch and remove ion chamber
• enable and open garage door
• take a test image for 0.1 sec  > corr 1 0.1
• finetune beamstop position
  
• step of +/- 0.1 mm in bsx  >  mvr bsx 0.1  or mvr bsx -0.1
  
• take test images > corr 1 0.1
  

Switch to Line-up Mode

• disable garage door (switch on garage door controller)
  
• disable ccd macros  >  ccdoff
• go into hutch, put ion chamber back in and change samples
  
• open CCD shutter  >  shopen
• new data file  >  newfile
  
• direct beam line-up
  
• move beamstop out of the direct beam  >  wbs; mv bsx 2; mv bsz -1
• move sample positions back  >  wsam; mv samth 0; mv samz 0; mv samx 0; mv samaz 0
• if there is no signal on Idet yet, move sample down 1 mm > mvr samz -1; wsam; wbs
  
• height line-up >  dscan samz -1 1 20 1; mv samz CEN
  
• make sample parallel to beam >  dscan samth -1 1 20 1; mv samth CEN
  
• redo height line-up >  dscan samz -.5 .5 20 1; mv samz CEN
  
• reflectivity line-up 
  
• block direct beam  >  mv bsz 1 (for 1200 - 1800 mm) or mv bsz 0.3 (for 600 - 700 mm flightpath)
  
• find relectivity >  dscan samth -.5 .5 50 1; laser
  
• determine ZERO of samth from print-out >  mv samth [ZERO]; set samth 0
• fine-tune sample height >  mv samth 0.2; dscan samz -.3 .3 30 1; mv samz CEN
• measure specular reflectivity >  ascan samth 0 1 100 1
• (optional: determine constant offset of Idet with closed beamstops >  ct 100)
• (optional: measure reflectivity between critical angles of film and substrate >  ascan samth .1 .25 75 1)

( note: after  ">"  follows the spec command, as it is typed in )
( note: [ZERO] denotes the numerical value of the zero offset )