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The T980 crystal collimation experiment is underway at the Tevatron todetermine if this technique could increase 980 GeV beam-halo collimationefficiency at high-energy hadron colliders such as the Tevatron and the LHC.T980 also studies various crystal types and parameters. The setup has beensubstantially enhanced during the Summer 2009 shutdown by installing a newO-shaped crystal in the horizontal goniometer, as well as adding a verticalgoniometer with two alternating crystals (O-shaped and multi-strip) andadditional beam diagnostics. First measurements with the new system are quiteencouraging, with channeled and volume-reflected beams observed on thesecondary collimators as predicted. Investigation of crystal collimationefficiencies with crystals in volume reflection and channeling modes aredescribed in comparison with an amorphous primary collimator. Results on thesystem performance are presented for the end-of-store studies and for entirecollider stores. The first investigation of colliding beam collimationsimultaneously using crystals in both the vertical and horizontal plane hasbeen made in the regime with horizontally channeled and verticallyvolume-reflected beams. Planning is underway for significant hardwareimprovements during the FY10 summer shutdown and for dedicated studies duringthe final year of Tevatron operation and also for a "post-collider beam physicsrunning" period.

Channeling and Volume Reflection Based Crystal Collimation of Tevatron Circulating Beam Halo (T-980)