The cSAXS Beamline X12SA coherent Small Angle Xray Scattering

1
The cSAXS Beamline X12SA(coherent Small Angle
X-ray Scattering)

• Pawel Jalocha
• Controls Pikett Training
• 22. November 2007

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Beamline status

• Beamline in regular operation with users since
  July/August 2007
• More instruments are required, thus building
  process/ developement is still going on
• New and some existing instruments will need to be
  integrated into EPICS.

3
Where and who ?
X12SA (cSAXS) Franz Pfeiffer Olivier
Bunk Andreas Menzel Xavier Donath
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Beamline layout
x12sa-cons-1
X12SA-VME-OP1
X12SA-VME-ES3
X12SA-VME-FE
X12SA-VME-ES1
X12SA-VME-ES2
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Beamline layout Optical Hutch
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Beamline layout Experimental Hutch
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How to login

• Login to the network gateway (use your afs
  account)
• ssh afs_user_at_x12sa-gw
• Login to a console (use beamline operator)
• ssh x12saop_at_x12sa-cons-1
• Start the launcher
• launcher

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Systems and IOCs

• X12SA-VME-FE FE slits, BPM
• X12SA-VME-OP1 Monochrom. crystals, mirror, BPM
• X12SA-VME-ES1 End station (regular) motors
• X12SA-VME-ES2 User (irregular) motors
• X12SA-VME-ES3 Digital and analog I/O, instruments

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Specific information

• Beamline scientists use SPEC to control the
  beamline, thus we dont have to worry about the
  GUIs very much. Only the low level EPICS layer
  is required, the rest is done by SPEC scripts.
• Interface to the new encoder card is specific,
  based on Babaks driver. I tried to be backwards
  compatible towards Elkes templates for old
  cards. Thus the old GUI still works, but the
  newer works better.

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Problems

• Monochromator encoders
• It happened twice that the encoders ran away
  (thus lost position) cause unknown, possibly
  external interference.
• Since then, the new encoder cards are installed
  and index mark usage is enabled, thus position
  can be recovered.
• but (!)
• Do not move the monochromator crystals by
  yourself (to recover the encoders) because they
  can collide !
• One vacuum incident
• One vacuum pump is too weak and thus one vacuum
  safety sensor is on the limit, but this is not
  really control problem