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Channeling and Volume Reflection Based Crystal Collimation of Tevatron Circulating Beam Halo (T-980) | | V. Shiltsev
; G. Annala
; A. Drozhdin
; T. Johnson
; A. Legan
; N. Mokhov
; R. Reilly
; D. Still
; R. Tesarek
; J. Zagel
; S. Peggs
; R. Assmann
; V. Previtali
; W. Scandale
; Y. Chesnokov
; I. Yazynin
; V. Guidi
; Y. Ivanov
; | | Date: |
7 Feb 2012 | | Abstract: | The T980 crystal collimation experiment is underway at the Tevatron to
determine if this technique could increase 980 GeV beam-halo collimation
efficiency at high-energy hadron colliders such as the Tevatron and the LHC.
T980 also studies various crystal types and parameters. The setup has been
substantially enhanced during the Summer 2009 shutdown by installing a new
O-shaped crystal in the horizontal goniometer, as well as adding a vertical
goniometer with two alternating crystals (O-shaped and multi-strip) and
additional beam diagnostics. First measurements with the new system are quite
encouraging, with channeled and volume-reflected beams observed on the
secondary collimators as predicted. Investigation of crystal collimation
efficiencies with crystals in volume reflection and channeling modes are
described in comparison with an amorphous primary collimator. Results on the
system performance are presented for the end-of-store studies and for entire
collider stores. The first investigation of colliding beam collimation
simultaneously using crystals in both the vertical and horizontal plane has
been made in the regime with horizontally channeled and vertically
volume-reflected beams. Planning is underway for significant hardware
improvements during the FY10 summer shutdown and for dedicated studies during
the final year of Tevatron operation and also for a "post-collider beam physics
running" period. | | Source: | arXiv, 1202.1519 | | Services: | Forum | Review | PDF | Favorites | |
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