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LARP Accelerator Systems Synthesis

US LHC Accelerator Research Program. bnl - fnal- lbnl - slac. LARP Accelerator Systems Synthesis. Vladimir Shiltsev. Content. What’s new after October’05 Collaboration Meeting LARP Org Chart changes, communication, DocDB, Web FY06 Budget – spending to date

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LARP Accelerator Systems Synthesis

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  1. US LHC Accelerator Research Program bnl - fnal- lbnl - slac LARP Accelerator Systems Synthesis Vladimir Shiltsev

  2. Content • What’s new after October’05 Collaboration Meeting • LARP Org Chart changes, communication, DocDB, Web • FY06 Budget – spending to date • DoE Review Nov’05; RC review + Lumi Review • LARP Collaboration Meeting Apr’06 @ LBL • Accelerator Systems Progress Highlights • New proposals • “hard deliverables” vs new proposals • “Gang of 5+1” • Stream of consideration & approval process LARPAC 05/11/2006 - Shiltsev

  3. Accelerator Systems Org Chart Recent Changes: Wolfram Fischer (BNL) to lead AP LARPAC 05/11/2006 - Shiltsev

  4. Communication within LARP: VideoConf of all AS L2s+Steve ~once/mos One-on-one meetings (site visits, reviews, etc) ~once/qrtr Collaboration meetings ~twice/year Communication with CERN First “long-termers” (P.Limon et al) Visits (HC, BC, Instr, etc) >1/mos Workshops (e.g. TAN) and reviews (e.g. RC) ~once/qrtr LARP Collab Meetings ~twice/yr US-CERN meetings ~ once/yr LARP Doc DB is functioning: ~280 docs uploaded from Oct’05-Apr’06 Communication/Coordination LARPAC 05/11/2006 - Shiltsev

  5. Introduced in Oct’05 Collab Mtg (FNAL) Main tool at the Apr’06 Collab Mtg (LBL) Management of Agenda Anyone can/may do it, but should be “convener” or session chair No need to keep agenda externally Talks/documents The speaker is responsible for maintaining the integrity of his/her document https://larpdocs.fnal.gov/LARP-private/DocDB/ LARPAC 05/11/2006 - Shiltsev

  6. USLARP.org web site Uses Plone A widespread wiki implementation Elliott McCrory is working on making this site useful Jump point to other web resources Anyone can modify the content/layout You have your own username/password There are lots of LARP web sites LBNL BNL Fermilab AD & TD SLAC ? Web pages LARPAC 05/11/2006 - Shiltsev

  7. FY06 Accelerator Systems Budget Pete got extra 150k$ to cover past investments BNL BC funds redistributed to FNAL and LBL  -60k$ RC hardware start delayed  -350k$ Nick got extra +50k$ for PhII irradition extra +30k$ To build BB-Wires LARPAC 05/11/2006 - Shiltsev

  8. Accel.Syst. Spendings 1.2M/3.6M=33% thru ½ year Mar.31, 2006 LARPAC 05/11/2006 - Shiltsev

  9. Make sure that we achieve all milestones And spend $$ approx as planned Reviews Be prepared and pass numerous reviews (small and big one) Next year planning/budget Have clear understanding of what will we do next year New initiatives Should always have a healthy pressure of new proposals Now anticipate some $$ to be freed after diagnostics development and fabrication finished in 2007 Topics LARPAC 05/11/2006 - Shiltsev

  10. DoE Review of LARP November 2005 • “The review committee was very pleased with the presentations on beam instrumentation and accelerator physics. In addition, they found the idea of participation in the development of a remote control room a very interesting possibility for enhancing interactions with CERN from afar via the Fermilab project “LHC@FNAL”. • Plans for commissioning of LHC hardware are already being implemented, with the first U.S. staff member (Peter Limon) already stationed at CERN. It was reported by management that U.S. laboratories will provide staffing for this effort, and, in fact, FNAL has committed seven persons to this task. LARP and CERN will cover costs of travel and additional living expenses in the Geneva area. • Finally, the committee again emphasized its displeasure with the lack of formality in dealings of LARP, and strongly recommended a more effective bookkeeping system for managing expenses and progress on all active tasks, and a person who would be responsible for implementing such a system”. LARPAC 05/11/2006 - Shiltsev

  11. Task Sheets are written by L2s and approved by L2s and L1s and L0 Most useful documents Objective, milestones, funds and personnel resources – all can be found on one page Semi-annual reports are lined up along these Task Sheets Task Sheets LARPAC 05/11/2006 - Shiltsev

  12. Reporting LARPAC 05/11/2006 - Shiltsev

  13. Fixing “…lack of formality…” : RLS LARPAC 05/11/2006 - Shiltsev

  14. Other Directive Documents LARPAC 05/11/2006 - Shiltsev

  15. Alex Ratti developed an acceptable – for both US and CERN – 6-item SignOff Documentatation scheme Now – for instrumentation only It’s model for other tasks (Collimators, Wires, etc) Another Concern: Sign-Offs LARPAC 05/11/2006 - Shiltsev

  16. Rotating Collimator-1 CDR Review December 2005, chaired by W.Turner OK, advised to design jaw support before “cut iron” Luminsity Monitor Final Design Review April 2006, chaired by T.Shea All positive, technical risks low to medium Schottky Monitor Final Design Review June 2006, at CERN Tune FB Final Design Review Before FY’07, m.p. at BNL Internal Reviews LARPAC 05/11/2006 - Shiltsev

  17. TCFB on RHIC ramp Good publicity is part of LARP success measure– we need to get more articles like that! P.Cameron LARPAC 05/11/2006 - Shiltsev

  18. Luminosity Monitor • The only real-time bunch-by-bunch luminosity measurement in the LHC • 25 ns bunch spacing, 1% resolution • R&D phase has been completed • Demonstrated 40 MHz performance using ALS X-ray beamline • Technical Challenges • Extremely high radiation levels • up to ~250 Grad • Signal processing to avoid pileup • 25 ns bunch spacing • Project Milestones: • Final Design Review (Apr 06) • System test at RHIC (Summer 06) • Four systems complete (Winter 06-07) • Installation and integration support (07) DAQ TAN FE electronics LARPAC 05/11/2006 - Shiltsev

  19. LHC 4.8 GHz Schottky Design R.Pasquinelli A.Jansson • Remarkable Progress: • Final drawings ready for CERN inspection • Final Design Review 06/19/06 at CERN • Will be the first LARP “thing” delivered to CERN • Plan to be one of anchors for BC • LHC@FNAL for monitoring LARPAC 05/11/2006 - Shiltsev

  20. Commissioning of US Deliverables and General HC • Since Nov’05 DOE Review: • 1st USLHC String transported to tunnel • LARP Oversight and technology transfer for USLHC interconnects • Transportation and Installation of 2nd IR quad/DFBX/D1 on going. • LARP commissioners receive “Project Associate” status, join a CERN group (AT/ACR or AT/MEL) for nominally one year and contribute to the groups general HC responsibilities as well as US deliverables. • One commissioner stationed at CERN now. 3-4 additional to follow in the fall of 2006. Peak participation in Summer’07 LARPAC 05/11/2006 - Shiltsev

  21. LHC Beam Commissioning • Accelerator Systems commissioners will • Organized on task groups of 3-4 people • (e.g. instrument operations+ developer+controls+physicist) • LARP is heading toward having (at least) a double presence in the LARP instruments groups • Will require coordination between L2s of “Instrumentation” and “Commissioning” LARPAC 05/11/2006 - Shiltsev

  22. Beam Commissioning Progress LARPAC 05/11/2006 - Shiltsev

  23. EoI Circulated LARPAC 05/11/2006 - Shiltsev

  24. LHC@FNAL Start-Up • Committee’s work complete • Endorsement received from • Fermilab Directorate • Affected Fermilab Divisions/Sections (AD, PPD, CD, FESS) • LARP management • CMS management • Construction plans in development • Funds set aside/awaiting DOE approval • Center planned to be open in September 2006 LARPAC 05/11/2006 - Shiltsev

  25. PHASE-I: Irradiation and Analysis of 2D Carbon-Carbon at BNLGOALS: Determine resilience of 2D CC against irradiation damage and assess how the critical property of thermal expansion changes with irradiation Material Irradiation Studies assembly • Primary Materials: Annealed Copper and Glidcop (85% Cu – 15% Al) – done! (May 4, 2006) • Other Potential Candidates: Super Invar, Gum Metal, 3D Carbon-Carbon irradiation Post-irradiation Analysis RESULT: PHASE-I 2D Carbon-Carbon self anneals irradiation ramage through thermal cycling in both strong and weak directions. Therefore, it is expected to meet the 25 micron condition set as goal Phase-II LHC Collimator Material Irradiation Planned for May 2006 LARPAC 05/11/2006 - Shiltsev

  26. Rotating Collimator: Rescheduled • Slip schedule ~6 months • Single jaw tests, support/stopper design & write-up by EOFY06 • RC1 performance report by mid FY07 • $400k returned to LARP management in FY06 adjustment • Expect slippage of Jan 2008 beam-testable RC2 delivery consistent with CERN’s latest schedule • RC task is one of “hard deliverable” and requires closer attention at SLAC and LARP to avoid any further slippages LARPAC 05/11/2006 - Shiltsev

  27. Satisfactory Benchmarking (POSINST) • Benchmark code against HCX experiment (LBNL) • expt. and sim. agree quantitatively on characteristics of e– oscillations observed in magnetic quadrupole flooded with electrons: experiment simulation LARPAC 05/11/2006 - Shiltsev

  28. Wire Compensator • RHIC beam-beam experiments in April 2006 Motivation: Test of wire compensation in 2007 Determine if a single parasitic at top energy causes beam losses that need to be compensated. Similar experiment done last year at injection energy - found strong effects at separations ≤ 6σ. 2 experiments done so far – April 5th, April 12th • Beam-beam simulationsof 2006 experiments Motivation: Tests and improvements of codes, predictions of observations in 2006 and of wire compensation Four groups FNAL, SLAC: LBL; University of Kansas • In CY06 – construct and install a wire compensator in RHIC, downstream of Q3 in IR6 LARPAC 05/11/2006 - Shiltsev

  29. New Initiatives (Apr’06 Coll.Mtg.) • Recently initiated (minor) activities: • Flux jumps effects • dB/B measurements • Potential new L3 tasks (need feasibility studies): • AC dipole • Crystal collimation • Longitudinal Density Monitor • e-lenses for Head-on B-B Compensation • Crab cavities • Considerations on Large Scale Improvements: • 1.5TeV Injector in LHC tunnel LER-LHC • Optical Stochastic Cooling LARPAC 05/11/2006 - Shiltsev

  30. Consideration Process • “Gang of 5+1” is formed to consider/propose that (L2s+VS+SP) • General requirements: • Interesting subject, development should push up the state of the accelerator physics and technology in the US • Of interest for LHC • Collaboration of >1 Lab, Universities welcome • Not at expense of current unfinished tasks • Right time and budget scale • Considerations finished and decision taken: • Either before start of FY’07 (better @ LARP Exec.Comm. June 5) • After presentation of feasibility study results at the Collab Mtg Then, L3 task formed, one of L2s picks it up  plan, RLS, $$, etc LARPAC 05/11/2006 - Shiltsev

  31. Common questions to answer • Title/subject • Leader and participants • Objectives • Deliverables • Time scale/schedule • Resources needed: • Add’l man-power (and type eng, phys, techs) • $$ Travel • $$ Labor • $$ M&S and Equipment LARPAC 05/11/2006 - Shiltsev

  32. Flux Jumps An accelerator magnet would need to demonstrate no or sufficiently small fluctuations How small? preliminary estimates show that 1 unit of d(b3) will result in ~2 units of Q’ jumps if residual dispersion controlled to better than 1 cm at I tune jumps and nonlinear effects need to be studied (AccelPhys) LARPAC 05/11/2006 - Shiltsev

  33. dB/B Fluctuations LHC tolerance: dB/B~3e-10 LHC screen: light and feels 20 K He flow turbulence; B-flux is constant at 3kHz • dB/B ~ dR/R  need dR < 1A to blow horizontal emittance First attempts at CERN (2006): ~1e-8 noise in quad/no screen ~1e-7 with air flow LARPAC 05/11/2006 - Shiltsev

  34. dB/B: Plan of Action • Perform dB/B measurements at CERN inside • Dipole (cold, high current) • Quadrupole (same) • Measure vibrations of the screen and LB quadrupole • Will take about 1 year • Cost: • 2-3 more trips to CERN ~6k$ • Low-noise pre-amp ~5k$ • Goal: conclude on dEmm/dt and need of FB • Consider: use of Tune FB BBQ and kicker - ? LARPAC 05/11/2006 - Shiltsev

  35. AC dipole • Recent good results from the Tevatron • Formal proposal for LHC at Collab meeting (Apr ’06) • Collaboration formed including Fermilab (A.Jansson, M.Syphers), UT Austin (R.Miyamoto, S.Kopp), BNL (M. Bai, R. Calaga) and CERN (H.Schmickler, J.Serrano) First AC dipole data in the Tevatron LARPAC 05/11/2006 - Shiltsev

  36. AC dipole collaboration • Objective • Investigate the conceptual design of ac dipole for LHC • System design (Magnet, power system, tuning range) • test system • the principles either at Tevatron or RHIC • Physics motivations and relevant beam experiments at RHIC and Tevatron • Financing • LARP: R&D • CERN: Final systems, funding available earliest at 2008 • NSF through university program • Deliverables • conceptual design report • Test system(s) • Relevant beam studies at Tevatron and RHIC • Detailed feasibility study plan by June 12 (DoE R) LARPAC 05/11/2006 - Shiltsev

  37. Electro-optic modulator InGaAs PD Fiberoptic Fiberoptic Fiberoptic coupler/lens Fast pulser 50 ps @ 40 MHz PC Data acquisition board (ADC) Longitudinal Density Monitor(DeSantis, Byrd, Zolotorev) • Fresh Idea: Couple SyncLite to optical fiber, deliver signal upstairs and process it there with electro-optical modulator • 50 ps slices, 10 s integration, resolves 0.5M p (!) • To see ~1e-5 tails of main bunches and ghost bunches • Presented at the LARP Coll.Mtg. • CERN interest is limited as they already have abort gap monitors (enough for start-up) • LDM can be a very useful tool for high luminosity operation • …Under consideration for LARP LARPAC 05/11/2006 - Shiltsev

  38. Head-on beam-beam compensation • If beam sizes and shapes are matched (e=p) • for LHC N_p=1.1e11, N_ip=4, for 10kV electrons (beta=0.2) one needs N_e=4.4e11 or J_e=1.2 A in L=3 m long e-beam • approx Gaussian e-current distribution with rms = 0.3-0.5 mm • … or donut shape? LARPAC 05/11/2006 - Shiltsev

  39. Challenges of Head-On Compensation • Total current is not a challenge • Optimum beam profile (vs bunchlength/beta*, Qx,y) • Compression to 0.3-0.5 mm is doable, though not easy • Keeping beam straight within 0.03-0.05 mm • Beam-beam centering within 0.03-0.05 mm • Will bending sections do harm? LARPAC 05/11/2006 - Shiltsev

  40. e-Lens configurations LARPAC 05/11/2006 - Shiltsev

  41. Head-On BBC Action Path • Form an LHC eCompensation Task Force with a charge to perform feasibility study in ~1 year • FNAL, BNL, SLAC, LBL, UKansas • Goal is to explore parameter space and effectiveness of head-on BBC in LHC and RHIC Cost: buried in Accel Physics “Beam-Beam” task In case of positive outcome, next steps may include: • Design of the TEL for RHIC 2007 ~200k$ SWF • Construction of TEL for RHIC 2008-2009 ~1300k$ M&S • Demonstrate head-on compensation 2009-2010 ~200k$ SWF • Build TELs for LHC 2011-2012 ~1100k$ M&S • Install TELs in LHC and commission 2012-2014 ~200k$ SWF Total: 3,000k$ LARPAC 05/11/2006 - Shiltsev

  42. Q’s to Answer: • Will Gaussian or truncated Gaussian e-current density distribution work (improve lifetime and reduce diffusion rates)? • Straightforward tracking with a weak-strong code • Is partial compensation helpful? • Is there a better distribution? • from first principles, theory, analytical consideration • Effects are beta_TEL/beta*/sigma_z; or dP/P • check in numerical tracking • Importance of e-pbar(p) interaction in bending sections • Which of three configurations is better? • Is the choice tune dependent? • Lifetime deterioration due to e-p misalignment: • e-beam straightness tolerances • relative e-p displacement, angle • Effect of low-frequency variations dJ, dX on beam lifetime • Ion cleaning efficiency tolerances • Cross-interaction with wires in LHC – if there is any • e-beam effect on coherent stability or strong-strong beam-beam effects LARPAC 05/11/2006 - Shiltsev

  43. 1.5 TeV SuperFerric Injector in LHC tunnel J.Johnstone T.Sen, H.Piekarz LARPAC 05/11/2006 - Shiltsev

  44. Summary LER-LHC • Title: LER – A 1.5 TeV Injector Accelerator for the LHC • Leader & Participants: Henryk Piekarz, Steve Hays, Yuenian Huang, John Johnstone, Gijs de Rijk, Lucio Rossi, Tanaji Sen, Vladimir Shiltsev • Objectives: Determine feasibility of the LER accelerator • Deliverables: A preliminary design of the LER accelerator • Time scale/schedule: One year • Resources needed: - Travel ($50 K) - Low Field VLHC magnet test at 1.6 T ($50K) Plan of Action : Make preliminary studies, prepare several presentations and attend LER-LHC Workshop at CERN (July 5, 2006) see its outcome and CERN position before committing any further resources LARPAC 05/11/2006 - Shiltsev

  45. Optical Stochastic Cooling Damping time, sec A.Zholents M.Zolotorev Lead ions Undulator: period-=7 m field = 10 T, number of periods = 3 Needs for R&D: • Bypass optics • Optical amplifier • Proof-of-principle with electrons Amplifier average power (W) Damping time for protons ~ 5 hours at 1kW amplifier power Plan of Action : support letter for OSC demonstration experiment (NSF) wait for results LARPAC 05/11/2006 - Shiltsev

  46. BackUp Slides LARPAC 05/11/2006 - Shiltsev

  47. B-field is frozen at high frequencies LARPAC 05/11/2006 - Shiltsev

  48. Wire Beam-Beam Compensation Overall Plan • FY2006: • Design and construct a wire compensator • Install wire compensator in RHIC in summer 2006, downstream of Q3 in IR6 • Perform theoretical studies to test the compensation and robustness • FY2007: • Study the wire compensation in RHIC with 1 proton bunch in each beam and nominal conditions at flat top and 1 parasitic interaction. • Beam studies to test tolerances on: beam-wire separation compared to beam-beam separation, wire current accuracy and current ripple • FY2008: • Decide on scope of work for the LHC wire compensation LARPAC 05/11/2006 - Shiltsev

  49. Detail of flex cooling supply tube Stub-shaft (bearing not shown) Contiguous with helical tube inside jaw. Formed after assembly-brazing of jaw and installation of bearing on stub-shaft Exits through support shaft per CERN design Material: CuNi10Fe1, 10mm O.D., 8mm I.D. Support shaft LARPAC 05/11/2006 - Shiltsev

  50. 1.3 LHC Collimation R&D • L2 Leader: Tom Markiewicz (SLAC) • FY06 budget 850 k$ • Goals: • The LHC cleaning system must have exceptional efficiency to meet its design parameters, significantly beyond the state-of-the-art that is achieved in existing colliders. It is crucial for the success of the LHC that different paths are explored in order to optimize the design, hardware and operational procedures for the LHC collimation system. In view of the exceptional difficulty for the LHC it is essential to pursue parallel R&D studies in- and outside of CERN. The phased approach for the LHC collimation system will allow to test various proposals and to implement the best solutions in an already defined upgrade path to nominal performance. The LHC Collimator R&D will complement the work at CERN and will be performed in close • L3 tasks: • Cleaning Efficiency Studies • Rotating Collimators R&D • Tertiary Collimators Studies • Material Irradiation Studies LARPAC 05/11/2006 - Shiltsev

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