Accelerator Handbook

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**Faraday Cups**

[[http://en.wikipedia.org/wiki/Faraday_cup|Wikipedia description of a Faraday Cup]]

[[OUAL Faraday Cup Control Panel Photograph]]

  * Each cup is contolled by one of the push buttons in the photo. 
      - The name of the cup operated by the button is always illuminated.
      - When the cup is in, the red "in" light in the button is illuminated.
      - When the cup is out, the green "out" light in the button is illuminated.
      - Each time a button is pushed the cup will change to the other state, in or out.


  * Placing the LE cup in the "out" position will sound an audible and visual warning throughout the facility.
  * When the HIGH RAD MODE key switch is in the "ON" position there will be a 15 second delay between pushing the LE cup "out" button and:
      - The cup lifting out of the beam path
      - The green "out" light on the button illuminating

  * We have 4 Faraday Cups for beam current optimization at critical points along the beam path.
      - LE: Located after the Buncher Tubes and before the LE XY steerer.
      - HE: Located at the exit of the Accelerator before Quad 1.
      - Analyzer: Located after the Image Slits and before the Beam Pick Off.
      - Swinger: Located under the steps, after the Analyzer and before Swinger Magnet 1.