SAD

1. Intro
2. Hazard Summary
  - Pretty big table on page 5. Worth a glance
    - Lists general types of hazards, what they could do, how we're controlling for them, how likely they are to happen, and severity/risk
  - Definition of Risk on page 9
    - Risk is a function of probability and severity (high severity + low probability = low risk, high + high = high, low + low = low)
3. LAF Description
  1. LAF Subsystems
    - Copper linac through the FEE, FACET-II facility, ESA, LCLS II RGD
    - Copper
      - 2856 MHz, room temp, klystrons, SLED cavities
      - 25 feet under gallery
        Gallery has klystrons, SLED cavities/modulators, power supplies, cooling water systems
      - 31 sectors (0 in the west, 30 in the east)
        Each sector ~100 m long
      - Linac West (S0 - 9)
        decommissioned and removed for superconducting LCLS-II (currently under construction)
      - Linac Middle (S10 - 19) and Linac East (S20 - 30) separated by concrete shielding wall and personnel passageway maze
        Can be operated independently
        But share control and water cooling systems
      - People can't be in Linac East if Linac Middle is running
        prompt radiation risk exposure
      - Max pulse rate is 120 Hz
        30 Hz if 120 isn't needed or to reduce power consumption
        Linac East and Middle can be operated at different rates
        Usually 30 Hz for FACET-II (the usually is suspicious here considering we haven't run it yet)
        Usually 120 Hz for LCLS
      - Linac Middle
        Max energy of ~16 GeV to FACET-II
        Positron beam coming in the future when they build a damping ring
        Not designed to go above 30 Hz
      - Linac East
        Max energy of ~18 GeV to Undulator Complex (has two undulator systems)
        Generate coherent x-ray beams that can be sent to the NEH and FEH
        Has previously sent beam to ESA, but that's currently decommissioned
        Could be brought back if needed
    1. LCLS-II Injector
      - Normal conducting laser-driven photocathode gun (186 MHz) followed by a buncher cavity
      - Currently set up to deliver electrons to a Faraday cup for commissioning without additional accelerationThere's currently a concrete shielding wall immediately downstream of the Faraday cup
        Will be removed before the injector is connected to the superconducting linac
        It's currently a Radiation Generating Device (not an accelerator)
        Will be reclassified when it's connected to the linac
    2. Linac West
      - LCLS-II injector through Sector 9
      - Currently under construction
    3. FACET-II Injector
      - At Sector 10
      - Produces electrons for acceleration in Linac Middle & delivery to the FACET-II experimental area in S20
      - Normal conducting S-band laser-driven photocathode gun
    4. Linac Middle
      - Middle third of the linac, sectors 10 though 20
      - Designed to accelerate, compress, & focus electron or positron beams to the FACET-II experimental area in S20
      - Magnetic chicane bunch compressors in sectors 10 and 14 shorten the electron beams longitudinally (increasing intensity)
      - Currently unable to produce positron beam
    5. Positron Source
      - Can produce positrons by slamming electrons into a target near S19
        The target is a plate of high-density, water-cooled tungsten-rhenium
        It's slowly rotated so that the heat from the beam is dissipated over a higher area
      - Target is followed by RF capture and acceleration sections that make a 200 MeV positron beam
      - You can park all or some portion of the e- beam on (in?) the transport line from S19 to the target
      - We currently can't transport, damp, or reinject positrons in to the linac (all that stuff was decommissioned)
    6. FACET-II Experimental Area
      - In S20
      - Beam transport and focusing system, followed by an area to mount experimental setups, followed by a beam dump
        The transport and focusing system has diagnostic devices and magnets
        Focuses the beam to a small spot size at the experimental setup
        Compresses the bunches longitudinally for "very" high peak current
4. Hazard Analysis
5. ASE
6. QA
7. Post Ops

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