Collimator Cave

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  • This is where the photon beam first enters Hall D. The tagger hall is 17 meters upstream.

  • This is the apparatus that will hold the active collimator.

  • A pic of me next to the future home of the active collimator. Photo credit to Sascha.

  • You can see the hole through which the photon beam will travel in this pic. The blue housing is a magnet to deter the electrons and positrons formed by pair production.

  • The backside of the magnet in the previous pic.

  • The second, "primary" collimator.

  • A downstream shot of the collimator cave. That's Sascha on the right.

  • A piece of equipment to eliminate the secondary photon "halo" around the photon beam.

  • A second magnet.

  • This is where the collimated beam will exit the second magnet.

  • An upstream view of the "Collimator Cave."

  • The collimated beam will travel through this opening to the main room of Hall D, where the Barrel Calorimeter (BCAL) and Forward Calorimeter (FCAL) are located.

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