Fermilab Accelerator Physics Center CRYSTAL COLLI MATI ON EXPERI MENT AT THE TEVATRON (T- 980): I NSTALLATI ON REVI EW Nikolai Mokhov Fer milab T-980 I nst allat ion Review Fer milab, Bat avia, I L August 7, 2008
Review of the T980 Crystal Collimator I nstallation Thursday, August 7, 2008, 1:30 – 3:30 PM Commit t ee: Phil Schlabach, Ron Lipt on and Br uce Hanna I nvolved: Roger Dixon, Ron Moore, Salah Chaurize, Cons Gat t uso, and T980@FNAL (Annala, Carr igan, Drozhdin, J ohnson, Mokhov, Reilly, Shiraishi, St ill, Tesarek, Zagel) T-980 Installation Review – Fermilab, Aug. 7, 2008 Crystal Collimation Experiment: Intro - N.V. Mokhov 2
Charge f or Crystal Collimator Committee (1) Roger Dixon: T-980 proposes t o inst all a cryst al collimat or in t he E0 st raight sect ion of t he Tevat ron in order t o t est t he f easibilit y of collimat ing t he Tevat ron beam using t he cryst al. I would like you t o assess t he over all r isk wit h r espect t o t he impact on t he Fermilab Collider program. I n part icular I would like you t o writ e a brief report t hat addresses t he f ollowing it ems: T-980 Installation Review – Fermilab, Aug. 7, 2008 Crystal Collimation Experiment: Intro - N.V. Mokhov 3
Charge f or Crystal Collimator Committee (2) 1. Assess t he f easibilit y meet ing t he of t he goals of t he experiment wit hin t he t ime est imat es given by t he experiment ers. 2. Assess t he t echnical f easibilit y of t he inst allat ion—Can t he inst allat ion be complet ed successf ully in t he t ime est imat ed by t he proponent s? 3. Assess any risk t o t he int egr it y of t he Tevat ron t hat result s f rom inst alling t he proposed device. 4. Assess t he risk t o bot h t he Tevat ron and t he Collider experiment s t hat result s f rom execut ing t he proposed experiment s using t he device af t er inst allat ion. T-980 Installation Review – Fermilab, Aug. 7, 2008 Crystal Collimation Experiment: Intro - N.V. Mokhov 4
Review of the T980 Crystal Collimator I nstallation Presentations: • Nikolai Mokhov, I nt ro (st at us, goals, t imescale, impact on D0 & CDF) • Rob Reilley, Goniomet er modif icat ions & improvement s • Dean St ill, I nst allat ion, commissioning & ear ly st udy plans • Rick Tesarek, New E0 inst rument at ion (commissioning & st udy plans) • J im Zagel, Flying wires T-980 Installation Review – Fermilab, Aug. 7, 2008 Crystal Collimation Experiment: Intro - N.V. Mokhov 5
E0 Crystal Collimation Layout 23.731 m 33.115 m LE033 BLM 23.731 m Channeled beam 3.5 mm At E03H crystal channeled beam Flying Pin Diode E03H Wire Collimator T-980 Installation Review – Fermilab, Aug. 7, 2008 Crystal Collimation Experiment: Intro - N.V. Mokhov 6
COMPARI NG EFFECTS OF PROTON HALO LOSSES FOR BENT CRYSTAL AND TUNGSTEN TARGET Cryst al aligned at peak (118 � rad) E03h with crystal E03H scan with D49 Target CDF E03 BLM 1400 1400 1200 1200 Loss (hz or volts) Loss (hz or volts) 1000 1000 T:LE033 cr T:LE033 800 800 C:LOSTP cr T:LE0PIN T:LE0PIN cr C:LOSTP 600 600 400 400 PI N 200 200 0 0 -10 -8 -6 -4 -2 0 -10 -8 -6 -4 -2 0 E03HCP (mm) E03HCP (mm)) Using the crystal: 1. The secondary collimat or can remain f urt her (1 mm or so) f rom t he beam t hus reducing impedance. 2. Almost a f act or of 2 reduct ion of CDF losses (in agreement wit h modeling)! 3. A f act or of > 5 lower irradiat ion of downst ream component s T-980 Installation Review – Fermilab, Aug. 7, 2008 Crystal Collimation Experiment: Intro - N.V. Mokhov 7
Goals f or 2008 to Spring 2009 (Phase I ) Two phases as described in t he T980 MoU Phase I Goals 1. Measure channeled, volume-ref lect ed (?) and scat t ered beams as well as beam losses downst ream of t he cryst al set up in comparison wit h simulat ions. 2. Demonst rat e reproducible beam loss reduct ion in t he B0 and D0 in compar ison wit h simulat ions, aiming at a rout ine use of t he cryst al based collimat ion in t he Tevat ron st ores. T-980 Installation Review – Fermilab, Aug. 7, 2008 Crystal Collimation Experiment: Intro - N.V. Mokhov 8
Goals f or Spring 2009 to the End of Run I I (Phase I I ) 1. Test and conf irm f undament al models of single-t urn and mult i-t ur n dynamics wit h cryst als. 2. Develop opt imal cr yst al/ goniomet er/ inst r ument at ion syst em f or one- and t wo-plane collimat ion exploring and exploit ing novel cr yst al t echnologies and newly under st ood phenomenon, volume r ef lect ion. 3. All of t he above in conj unct ion wit h t he CRYSTAL experiment at CERN SPS, aiming at a Phase I I cryst al- based collimat ion syst em f or t he LHC (perf ormance, reduced impedance and heavy-ion opt ion) T-980 Installation Review – Fermilab, Aug. 7, 2008 Crystal Collimation Experiment: Intro - N.V. Mokhov 9
STRUCT/ CATCH Simulat ions: Prof iles at 9 Critical Locations in Tevatron wit h O- Shaped Crystal E03 collimat or E11 f lying wir e Fir st t urn, all collimat ors are ret ract ed A. Drozhdin T-980 Installation Review – Fermilab, Aug. 7, 2008 Crystal Collimation Experiment: Intro - N.V. Mokhov 10
Multi- Turn Simulat ions with 0. 44- mrad O- shaped Crystal Tot al losses on E03 and F172 via channeling, VR and MCS. I nversely propor t ional t o Dean’s LE033 BLM wit h E03 out Channeled beam loss on E03 Edge-scat t ered in E03 and F172, x 5 Loss at B0, x 140 All collimat ors are in wor king posit ions A. Drozhdin T-980 Installation Review – Fermilab, Aug. 7, 2008 Crystal Collimation Experiment: Intro - N.V. Mokhov 11
Plans f or Phase I 1. I nst allat ion at appr opr iat e downt ime or Oct ober mini-shut down (10- 12 hr s). 2. Commissioning: pr e-beam and beam t est s and End-of -St or e st udies (see Dean’s t alk). 3. Sever al EOS st udies of beam dynamics and collimat ion ef f iciency aiming at r epr oducibilit y and BOS t est . 4. Rout ine use of cr yst als in t he Tevat r on st or es. 5. P r epar at ion of new cr yst als, har dwar e and elect r onics f or inst allat ion in t he t unnel dur ing t he Spr ing 2009 shut down. 6. Fur t her plans, scope and beam r equest s depend on out come of P hase I and ar e subj ect t o a FNAL r eview and 2009-2010 r un plans. T-980 Installation Review – Fermilab, Aug. 7, 2008 Crystal Collimation Experiment: Intro - N.V. Mokhov 12
I mpact on CDF/ D0 • Benef it t o CDF/ D0: at least a f act or of 2 r educt ion in beam loss (2005 dat a). Can be a mor e subst ant ial r educt ion wit h new cr yst als and ot her har dwar e of (> J une 2009). • P ossibly anot her cr yst al at F49 t o r educe pbar losses in CDF/ D0. hase I : 20 hr s, or 4.3 pb -1 out of • Maximum possible luminosit y loss in P 1300 pb -1 / yr , or 0.33% (compar ed t o 0.68% dif f er ence in CDF and D0 luminosit ies). • Not hing happens if t he cryst al doesn’t channel (Dec. 2007 r esult s). • Minimal r isk t o t he silicon: only t he t ar get at E0 is r et r act ed, not hing else moves. • Ef f ect or r isk t o CDF/ D0 wit h cryst al collimat or f or f ull st ore (BOS) (i) cr yst al wor ks: losses r educed via ef f icient scr aping; (ii) cr yst al doesn’t wor k: re-inser t t ungst en t ar get , loose small amount of luminosit y at beginning of st or e (10 minut es), beam losses t he same. T-980 Installation Review – Fermilab, Aug. 7, 2008 Crystal Collimation Experiment: Intro - N.V. Mokhov 13
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