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  1. Purpose 

    1. Goal
      1. To familiarize LCLS associates and technicians with the XPP mode-change process and the pertinent instrument and beamline features.
      2. To provide the procedural information to allow a team of LCLS technician to perform a routine XPP mode-change without supervision.
    2. Background
      1. The XPP instrument can expose experimental samples with a high-fluence (PINK) X-ray beam AND a highly monochromatic (MONO) beam. 
      2. The X-ray beam type is predetermined by the experimental team and is based on sample attributes and the experimental goals.
      3. A reconfiguration (aka a mode-change) of the XPP beamline places the experimental sample into the appropriate beam-type.
      4. The two standard modes in which the instrument can be configured are: XPP Mode (PINK beam), and FEH Mode (MONO beam).
    3.  Technician requirements
      1. Proficient in bringing up and working XPP EPICS control screens and MKS pressure gauge readouts.
      2. Proficient in UHV practice and gate valve operation, EVAC flange operation, ion and turbo pump operation.
      3. Proficient in safe use of hand tools and be able to safely lift and carry beampipe sections up to 20 kg mass.
      4. Knowledgeable in the use of ServiceNow ticketing, in directing the Duty Technician to pertinent config-control locks.
      5. Knowledgeable in the safe use of the hutch drift pipe lifting device and able to correct misalignment and sync errors.
      6. Knowledgeable in LN Dewar change out, and in the layout and operation of the hutch dry nitrogen system.


  1. Subject Matter Experts (SMEs)

    1. XPP Area Manager, Daniel Stefanescu (daniel@slac.stanford.edu) c: 408-460-8834
    2. Lasers Area Manager, Adam White (adamwh@slac.stanford.edu) 
    3. LCLS Technician, Ivan Curiel (ivanc@slac.stanford.edu) 
    4. XPP Lead Scientist, Diling Zhu (dlzhu@slac.stanford.edu)


  1. Resource List

    1. Resource #1:   Mode-Change Checklist (obsolete), https://drive.google.com/file/d/0B1aLSx4GIR0eNHdtZTZtNC1TLVk/view?usp=sharing
    2. Resource #2:   XPP Vacuum System Layout, https://drive.google.com/file/d/1A4xztqnAwiDJzGTcIvqhKcGv3BYP6qrA/view?usp=sharing
    3. Resource #3:   XPP Drift Lifter Manual, https://drive.google.com/file/d/1wXus8Nin_cXcNB3WvoysSduU2G4Ykw5n/view?usp=sharing


  1. Progress Matrix



Partially Trained

Fully Trained

Subject Matter Expert

Skill #1

XPP vacuum system control

Under direction or supervision, must be able to open the EPICS TechScreen and determine the XPP vacuum system condition on any Hutch or Control Room terminal.  Must be able to execute vacuum system operations when instructed to do so.Must be able to configure the XPP vacuum system for vent, for mode-change, and for pumpdown.  Must be able to stop and to reverse any XPP vacuum system operation, bringing the system to a safe condition.Must be able to detect off-normal situations and provide corrective actions.  Must be able to successfully train other operators, and be able to perform all of the mode-change steps without supervision.

Skill #2

XPP beamline reconfiguration

Under direction or supervision, must be able to check pressures, isolate components, power on/off gauges and pumps, operate gate valves, clean-dissemble flanges, transport pipe sections, operate drift lifter.Must perform all of the mode-change operations with minimal supervision.  Must be able to lead part or all of the mode change operation.Must be able to detect off-normal conditions during beamline configuration and to provide corrective actions.  Must be able to successfully train other operators.


  1. Training Content

    1. Step by step instructions
    2. When the job is done right, we have a happy Vader! 
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