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Drozhdin, A.I.

Paper Title Page
TUOAMH03 Channeling and Volume Reflection Based Crystal Collimation of the Tevatron Circulating Beam Halo (T980) 1243
 
  • V.D. Shiltsev, G. Annala, R.A. Carrigan, A.I. Drozhdin, T.R. Johnson, A.M. Legan, N.V. Mokhov, R.E. Reilly, D.A. Still, R. Tesarek, J.R. Zagel
    Fermilab, Batavia
  • R.W. Assmann, V.P. Previtali, W. Scandale
    CERN, Geneva
  • Y.A. Chesnokov, I.A. Yazynin
    IHEP Protvino, Protvino, Moscow Region
  • V. Guidi
    INFN-Ferrara, Ferrara
  • Yu.M. Ivanov
    PNPI, Gatchina, Leningrad District
  • S. Peggs
    BNL, Upton, Long Island, New York
  
 

The T980 crys­tal col­li­ma­tion ex­per­i­ment is un­der­way at the Teva­tron to study var­i­ous crys­tal types and pa­ram­e­ters and eval­u­ate if this tech­nique would in­crease TeV beam-ha­lo col­li­ma­tion ef­fi­cien­cy at high-en­er­gy hadron col­lid­ers such as the Teva­tron and the LHC. The setup has been sub­stan­tial­ly en­hanced dur­ing the Sum­mer 2009 shut­down by in­stalling a new O-shaped crys­tal in the hor­i­zon­tal go­niome­ter, 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. Plan­ning is un­der­way for ded­i­cat­ed stud­ies dur­ing a Teva­tron post-col­lid­er physics run­ning pe­ri­od.

  

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Slides

 
TUPEB076 Development of hollow electron beams for proton and ion collimation 1698
 
  • G. Stancari, A.I. Drozhdin, G.F. Kuznetsov, V.D. Shiltsev, D.A. Still, A. Valishev, L.G. Vorobiev
    Fermilab, Batavia
  • R.W. Assmann
    CERN, Geneva
  • A.A. Kabantsev
    UCSD, La Jolla, California
  • G. Stancari
    INFN-Ferrara, Ferrara
  
 

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 built. Its per­for­mance and sta­bil­i­ty were mea­sured at the Fer­mi­lab test stand. The gun will be in­stalled in one of the ex­ist­ing Teva­tron elec­tron lens­es for pre­lim­i­nary tests of the hol­low-beam col­li­ma­tor con­cept, ad­dress­ing crit­i­cal is­sues such as align­ment and in­sta­bil­i­ties of the over­lap­ping pro­ton and elec­tron beams.