Author: Shiltsev, V.D.
Paper Title Page
MOODN3 Advanced Bent Crystal Collimation Studies at the Tevatron (T-980) 73
 
  • V.V. Zvoda, J. Annala, R.A. Carrigan, A.I. Drozhdin, T.R. Johnson, S. Kwan, N.V. Mokhov, A. Prosser, R.E. Reilly, R. Rivera, V.D. Shiltsev, D.A. Still, L. Uplegger, J.R. Zagel
    Fermilab, Batavia, USA
  • E. Bagli, V. Guidi, A. Mazzolari
    INFN-Ferrara, Ferrara, Italy
  • Y.A. Chesnokov, I.A. Yazynin
    IHEP Protvino, Protvino, Moscow Region, Russia
  • Yu.M. Ivanov
    PNPI, Gatchina, Leningrad District, Russia
 
  Funding: * Work is supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy through the US LHC Accelerator Research Program (LARP).
The T-980 bent crystal collimation experiment at the Tevatron has recently acquired substantial enhancements. First, two new crystals - a 16-strip one manufactured and characterized by the INFN Ferrara group and a quasi-mosaic crystal manufactured and characterized by the PNPI group. Second, a two plane telescope with 3 high-resolution pixel detectors per plane along with corresponding mechanics, electronics, control and software has been manufactured, tested and installed in the E0 crystal region. The purpose of the pixel telescope is to measure and image channeled (CH), volume-reflected (VR) and multiple volume-reflected (MVR) beam profiles produced by bent crystals. Third, an ORIGIN-based system has been developed for thorough analysis of experimental and simulation data. Results of analysis are presented for different types of crystals used from 2005 to present for channeling and volume reflection including pioneering tests of two-plane crystal collimation at the collider, all in comparison with detailed simulations.
 
slides icon Slides MOODN3 [1.052 MB]  
 
MOP147 Experimental Study of Magnetically Confined Hollow Electron Beams in the Tevatron as Collimators for Intense High-Energy Hadron Beams 370
 
  • G. Stancari, G. Annala, V.D. Shiltsev, D.A. Still, A. Valishev, L.G. Vorobiev
    Fermilab, Batavia, USA
 
  Funding: Fermi Research Alliance, LLC operates Fermilab under Contract DE-AC02-07CH11359 with the US Department of Energy. This work was partially supported by the US LHC Accelerator Research Program (LARP).
Magnetically confined hollow electron beams for controlled halo removal in high-energy colliders such as the Tevatron or the LHC may extend traditional collimation systems beyond the intensity limits imposed by tolerable material damage. They may also improve collimation performance by suppressing loss spikes due to beam jitter and by increasing capture efficiency. A hollow electron gun was designed and tested at Fermilab for this purpose. It was installed in one of the Tevatron electron lenses in the summer of 2010. We present the results of the first tests of the hollow-beam collimation concept on individual 980-GeV antiproton bunches in the Tevatron.
 
 
THP067 Ambient Beam Motion and its Excitation by "Ghost Lines" in the Tevatron 2255
 
  • V.D. Shiltsev
    Fermilab, Batavia, USA
 
  Transverse betatron motion of the Tevatron proton beam is measured and analyzed. It is shown that the motion is coherent and excited by external sources of unknown origins. Observations of the time-varying "ghost lines" in the betatron spectrum are reported.