SAXS @ D-line: Procedures

Switch to CCD mode

• move beamstop into the beam > mv bsx 0; mv bsz 0;  wbs
  
• verify that beamstop is in the beam : Idet counts should be small
  
• close shutter  >  shclose
• check: Imon counts should be small
  
• enable ccd macros  >  ccdon
• go into hutch and remove ion chamber
• move CCD flush against marker clamp trying to avoid angular offset
  
• interlock hutch, enable and open garage door
• take a test image for 0.1 sec  >  corr 1 0.1
• if necessary, finetune beamstop position
  
• move bsx or bsz in steps of 0.1 mm and take test image > corr 1 0.1

Take direct beam image (if necessary)

• go into hutch and attach absorber (lead tape @ 10 keV) to entrance of flight path
  
• interlock hutch and open garage door
• move beam stop out of the way > mv bsx 2
• TAKE TEST IMAGE > corr 1 0.1
• if image okay (all dark), try 1 sec and then 10sec exposure
• move beamstop back in > mv bsx 0
  
• go into hutch and remove absorber
  

Switch to Line-up Mode

• disable garage door (switch on controller)
  
• disable ccd macros  >  ccdoff
• go into hutch, move CCD back, put ion chamber in and change samples
  
• interlock hutch and open CCD shutter  >  shopen
• new data file  >  newfile [sample name]
  
• direct beam line-up
  
• move beamstop out > wbs; mv bsx 2
  
• move sample to ZERO position > wsam; mv sx 0
  
• scan sample through beam > dscan samx -19 19 76 1
  
• note sx positions with promising absorption to take images there
• beamstop line-up (if needed)
• > dscan bsx -3 3 30 1
• move bsx to the center of the blocked area using the numerical scan output
  
• > dscan bsz -3 3 30 1
• move bsz to the center of the blocked area using the numerical scan output
  

( note: after  ">"  follows the spec command, as it is typed in )