1 - Total loss of flux at sample
Consequences:
A. No readout in the beamstop diode
B. Black image on the detector
Causes:
A. Ring current at zero
Await Ring Refill, Check Optics Hutch for Shutter open on beam return
B. Optic shutter closed
· It may happen that the optic shutter remains closed after a refill. Call the control room (8899). The operators can open the shutter for you.
· A Machine protection System (MPS) will also closed the optic shutter if something went wrong in the optic hutch. Open the “interlock” window and check where the fault is.
o Vacuum?
If the vacuum is OK, open the valves and reopen the optic shutter
o Water flow?
Fill the water bath
o Hutch door open?
Do the search of the optic hutch and reopen the optic shutter
o Cryo trip?
Reset interlock and reopen the optic shutter
C. Experiment shutter closed
· There is a “green” light on the search panel.
o Do a search of the experimental hutch
· “BEAM ON” is not lighted on the search display panel
o Do a search of the experimental hutch
· Check the vacuum after the experiment shutter
D. Fast shutter closed
See document “Set up the fast shutter on I22.doc”
E. Sample alignment misaligned
Scan the precision stage (pxyx/pxyy) or the table (basex/basey)
F. Detector issues
· Protective cover on the detector.
· Voltages loss
o Follow the instructions on the document located on the power supply
· No gas left in the detector
o Call the EHC for replacement if the gas bottles are empty (It will take about 6 hours to recover)
o Check gas is circulating through the detector (mass flow controller)
2 - Reduced flux at sample
Consequences:
A. Drop on the readout in the beamstop diode
B. Noisy image on the detector
Causes:
A. Attenuators in place
Check D3 and D5 for attenuation
B. Detector issues
· Voltages wrong
o Follow the instructions in the manual
· Gas mix wrong
o Set gas mix to correct program in CC2 High Xe content for >12keV
· No gas left in the detector
o Call the EHC for replacement if the gas bottles are empty (It will take about 6 hours to recover)
o Check gas is circulating through the detector (mass flow controller)
C. Air in the SAXS camera
· SAXS tube not pumped
o Switch the pump on (Wait for 10-30minutes depending on the camera length)
· SAXS windows camera blows
o Cut Window can be found in Lab 13
D. Sample alignment misaligned
Scan the precision stage (pxyx/pxyy) or the table (basex/basey)