Crystal Collimation Studies at the Tevatron (T-980)

Bent-crys­tal chan­nel­ing is a tech­nique with a po­ten­tial to in­crease the beam-ha­lo col­li­ma­tion ef­fi­cien­cy at high-en­er­gy col­lid­ers. First mea­sure­ments at the Teva­tron in 2005 have shown that using a 5-mm sil­i­con crys­tal to de­flect the pro­ton beam halo onto a sec­ondary col­li­ma­tor im­proves the sys­tem per­for­mance by re­duc­ing the ma­chine impedance, beam loss­es in the col­lid­er de­tec­tors and ir­ra­di­a­tion of the su­per­con­duct­ing mag­nets, all in agree­ment with sim­u­la­tions. Re­cent re­sults, ob­tained with sub­stan­tial­ly im­proved go­niome­ter and en­hanced beam di­ag­nos­tics, are re­port­ed show­ing chan­nel­ing col­li­ma­tion of the ~1-TeV cir­cu­lat­ing pro­ton beam halo at the Teva­tron col­lid­er. Com­pre­hen­sive re­sults of com­put­er mod­el­ing are pre­sent­ed which allow fur­ther de­vel­op­ments of the T-980 ex­per­i­ment to­wards a ro­bust sys­tem com­pat­i­ble with re­quire­ments to high-ef­fi­cient col­li­ma­tion at the Teva­tron and LHC hadron col­lid­ers.