1. LARP Accelerator Systems Overview: How are we doing? Vladimir Shiltsev bnl - fnal- lbnl - slac US LHC Accelerator Research Program

2. LARP Collaboration Meeting 04/26/2006 - Shiltsev 2 Content What’s new after October’05 Collaboration Meeting –LARP Org Chart changes, communication, DocDB –FY06 Budget – spendings to date –RC review + Lumi Review DoE Review Nov’05  LARPAC May’06  DoE Review Jun’06 R&D Progress: –Instrumentation –Commissioning –Collimation –Accelerator Physics New Proposals

3. LARP Collaboration Meeting 04/26/2006 - Shiltsev 3 Accelerator Systems Org Chart V.Shiltsev Accelerator Systems Instrumentation: A.Ratti Tune Feedback (P.Cameron) Luminometer (A.Ratti) Schottky Monitor (A.Jansson) Commissioning: M.Syphers Beam Commiss-ing (E.Harms) IR Coms-ing (M.Lamm) Collimators R&D: T.Markiewicz Efficiency Studies (A.Drees) Rotating Collim. (T.Markiewicz) Tertiary Collim (N.Mokhov). Irradiation Studies (N.Simos) Accel Physics: W.Fischer E-cloud (M.Furman) IR & Beam-Beam (T.Sen) Wire Compens’n (T.Sen) Changes: Wolfram to lead AP Be discussed at this meeting: Finish some L3 tasks Introduce new L3 tasks any org structure for new initiatives?

4. LARP Collaboration Meeting 04/26/2006 - Shiltsev 4 Communication/Coordination 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 –US-CERN meetings ~ once/yr LARP Doc DB is functioning: –162 docs uploaded from Oct’05-Apr’06

5. LARP Collaboration Meeting 04/26/2006 - Shiltsev 5 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

6. LARP Collaboration Meeting 04/26/2006 - Shiltsev 6 Accel.Syst. Spendings 0.9M/3.6M=25% thru 5 mos Feb.28, 2006 (compare with 31% MAG)

7. LARP Collaboration Meeting 04/26/2006 - Shiltsev 7 That tops the list of my worries … Make sure that we achieve all milestones –And spend $$ approx as planned Reviews –Be prepared and pass numerous reviews (small and big one) Next year planning/budget –Have clear understanding of what will we do next year New initiatives –Should always have a healthy pressure of new proposals –Now anticipate some $$ freed after diagnostics development and fabrication finished in 2007 This collaboration meeting is to address all that: –L2s will report Friday

8. LARP Collaboration Meeting 04/26/2006 - Shiltsev 8 Speaking of Reviews: Nov’05 DoE “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”.

9. LARP Collaboration Meeting 04/26/2006 - Shiltsev 9 TCFB on RHIC ramp P.Cameron

10. LARP Collaboration Meeting 04/26/2006 - Shiltsev 10 Luminosity Monitor - I 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 Beam test planned for RHIC run VI System intragation planning at CERN –TAN instrumentation workshop on March 10 Final Design Review at LBL Monday April 24

11. LARP Collaboration Meeting 04/26/2006 - Shiltsev 11 Luminosity Monitor - II Technical Challenges –Extremely high radiation levels up to ~250 Grad –Signal processing to avoid pileup 25 ns bunch spacing Status –Completed R&D and FDR 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

12. LARP Collaboration Meeting 04/26/2006 - Shiltsev 12 LHC 4.8 GHz Schottky Design R.Pasquinelli A.Jansson Remarkable Progress: –Final drawings ready for CERN inspection –Data acquisition issues – discussed at Apr25 mtg at LBL –Next revision of EDMS is needed –Final Design Review 06/19/06 at CERN

13. LARP Hardware Commissioning Tasks Installation Oversight Since DOE Review Last Fall: First USLHC String (Q1-Q3/Feedbox/D1) transported to tunnel LARP Oversight and technology transfer for USLHC interconnects Transportation and Installation of Second IR quad/DFBX/D1 on going. Limited LARP oversight planned for all US deliverable installations Photos from Jan 2006 IR 8L installation

14. LARP Collaboration Meeting 04/26/2006 - Shiltsev 14 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. Short term HC support from US experts as needed One commissioner stationed at CERN now. 3-4 additional to follow in the fall of 2006. Peak participation coincides with anticipated peak commissioning period FY07. Commissioning of US Deliverables and General HC LARP Hardware Commissioning Tasks

15. LARP Collaboration Meeting 04/26/2006 - Shiltsev 15  Several US visitors to CERN in January/February 06  Nearly continuous presence for ~6 weeks  Chamonix workshop  Beam Commissioning logistics  Software  CCC opening  get to know LHC beam principals  Informal review of LHC Beam Commissioning structure completed (results presented at this meeting)  Beam Commissioning ‘Expression of Interest’ (to be introduced at this meeting)  Refining areas of involvement, beginning to assign names/share with CERN counterparts  Gearing up for LARP presence during SPS running, more so for Sector test  More detail in Breakout session Beam Commissioning Status

16. LARP Collaboration Meeting 04/26/2006 - Shiltsev 16 LHC@FNAL Status  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  More detail in Breakout session

17. LARP Collaboration Meeting 04/26/2006 - Shiltsev 17 Status of Phase II Rotating Collimator Project at 10-06-2005 Pheasant Run LARP Mtg. SLAC and CERN agree on an initial set of specifications for the first mechanical prototype RC1 –Put a new vacuum tank with cylinder jaws that fits LHC spatial constraints on a CERN Phase I base and use CERN Phase I scheme for jaw alignment and cooling input –Provide 12kW cooling to each 136mm x 95cm jaw through flexible tubing –Relax 25um flatness tolerance but provide flexible jaw support and a central stop mechanism to ensure thermal bowing is AWAY from beam 400 um sagitta for 1 hr beam lifetime engineering steady state 1200 um sagitta for 12min beam lifetime 10 second transient

18. LARP Collaboration Meeting 04/26/2006 - Shiltsev 18 Progress since 10-06-2005 RC1 Prototype Conceptual Design Report –reviewed and accepted by CERN and suggestions incorporated –independent review 12/15/05 Lou Bertolini-LLNL, Alex Makarov-FNAL, Bill Turner (LBL) Major Findings: Fine, but …. –Do not ‘cut metal’ until jaw support and stop scheme developed »In progress –Check thin-Cu over Stainless for performance √ No improvement –Increase engineering effort Full time engineer (Steve Lundgren) and designer hired 3 April Current Activities: –Braze tests of cooling coils beginning –Prep for full cooling & deformation tests –Acquisition of Phase I support & mover assemblies –Redrawing of CERN parts for US fabrication

19. LARP Collaboration Meeting 04/26/2006 - Shiltsev 19 FY06 Goals of Phase II Rotating Collimator Project and Beyond Work Plan outlined 10/6/2005 1.Single jaw thermal test: one jaw with internal helical cooling channels to be thermally loaded for testing the cooling effectiveness and measuring thermal deformations. 2.Full RC1 prototype: a working prototype for bench top testing of the jaw positioning mechanism, supported to simulate operation in all necessary orientations, but not intended for mounting on actual beamline supports with actual beamline, cooling, control and instrumentation connections. 1.Deliverables listed 10/6/2005 1.Final version of RC1 CDR: Awaiting support/stopper design 2.External review of RC1 CDR: √ 3.Performance report on RC1: Progress delayed ~6 months due to reviews & manpower issues New Plan: 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

20. LARP Collaboration Meeting 04/26/2006 - Shiltsev 20 PHASE-I: Irradiation and Analysis of 2D Carbon-Carbon at BNL GOALS: Determine resilience of 2D CC against irradiation damage and assess how the critical property of thermal expansion changes with irradiation assembly irradiation Post-irradiation Analysis it is expected to meet the 25 micron 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 Primary Materials: Annealed Copper and Glidcop (85% Cu – 15% Al) Other Potential Candidates: Super Invar, Gum Metal, 3D Carbon-Carbon Material Irradiation Studies

21. LARP Collaboration Meeting 04/26/2006 - Shiltsev 21 E-cloud since last Mtg Completed updated simulations of ecloud power deposition in LHC dipoles –M. Furman and V. Chaplin, PRST-AB 9, 034403 (March 20, 2006) Tedious exploration of parameter space with 2D code POSINST (see below) –Peak SEY max now constrained to be <~1.2 for nominal intensity & bunch spacing –Code improvements 3D self-consistent code (WARP/POSINST) –Jean-Luc Vay (LBNL) now 20% LARP funded (starting FY06) –Initial qualitative results for one bunch in one FODO cell (LARP mtg, Apr. 05) –New results for a train of 5 bunches with more detailed model (see below) –Code improvements RHIC studies –Feb. 2006: two CERN e – detectors installed (some not LARP funded, but important) Common pipe region in IP10, warm section –Polarized proton beams for this run –Ping He doing RHIC simulations; calibration barely started

22. LARP Collaboration Meeting 04/26/2006 - Shiltsev 22 Sample simulation: ecloud at LHC dipoles (Furman and Chaplin, PRST-AB 9, 034403) ecloud power deposition –POSINST code –LHC arc dipole magnet –key parameters: N b, t b,  max –current result:  max must be <1.2- 1.3 (achievable but not easy) t b =25 ns N b =1e11 1.15e11 t b =25 ns t b =75 ns : cooling capacity available for EC power deposition

23. LARP Collaboration Meeting 04/26/2006 - Shiltsev 23 Sample 3D self-consistent simulations (WARP/POSINST) (courtesy J.-L. Vay) WARP/POSINST-3D T = 4.65  s experiment simulation Oscillations Electrons bunching Beam ions hit end plate WARP/POSINST-3D T = 0.3  s LHC FODO cell can now follow batch of bunches with photo- e – and secondary e – snapshot from run with 5 bunches: Benchmark code against HCX experiment (LBNL) expt. and sim. agree quantitatively on characteristics of e – oscillations observed in magnetic quadrupole flooded with electrons:

24. LARP Collaboration Meeting 04/26/2006 - Shiltsev 24 Future Plans 3D self-consistent simulations: –Study long-term behavior of beam This is a nontrivial exercise that may require code improvements Main new concern: slow emittance growth (Benedetto et. al. PRSTAB 8 124402 (2005) et. seq.) Also: address “old” concern” (ecloud-induced head-tail instability) Summer student to come to LBNL for 12 weeks this summer –Simulate optimal conditioning scenario for LHC –Understand leftover details from SPS measurements –Contribute (time permitting) to 3D self-consistent simulations RHIC: –Analyze collected data obtained with CERN detectors –Complete simulations –Understand ecloud sensitivities and correlate them to other observables (eg., P rise)

25. LARP Collaboration Meeting 04/26/2006 - Shiltsev 25 IR Layouts Baseline Layout Quads first Too many parasitics Dipoles first layout Early separation but …. Triplets Doublets

26. LARP Collaboration Meeting 04/26/2006 - Shiltsev 26 IR Optics Issues Pole tip field [T] Aperture [mm] Quads 1 st Dipoles 1 st : triplets Dipoles 1 st : doublets 10 11 10 101 107 104 IR Magnet apertures and fields Energy Deposition Major issue in all optics, but dipole designs more challenging. Beam-beam interactions Demonstration of wire compensation would favor quads 1 st. Chromaticity and Nonlinear Correctors Corrector strengths lower with quads 1 st but independent control of 2 beams with dipoles 1 st. Luminosity gain with lower L* Larger gain with quads 1 st. Flux jumps in IR magnets Chromaticity jumps small (~2 units) with Δb 3 = 1 in both optics if spurious dispersion in IR is controlled to ~1cm at IP. Nonlinear effects need to be studied

27. LARP Collaboration Meeting 04/26/2006 - Shiltsev 27 Beam-beam experiments, simulations 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 5 th, April 12 th Analysis to be presented by W. Fischer Beam-beam simulations of 2006 experiments Motivation: Tests and improvements of codes, predictions of observations in 2006 and of wire compensation Four groups FNAL: V. Ranjbar, T. Sen; SLAC: A. Kabel; LBL: J. Qiang; University of Kansas: J. Shi Website: http://www-ap.fnal.gov/~tsen/RHIChttp://www-ap.fnal.gov/~tsen/RHIC for information exchange and results

28. LARP Collaboration Meeting 04/26/2006 - Shiltsev 28 Beam-beam simulation results BBSIM (VR, TS) simulations for lifetime show a linear dependence on separation FNAL Kansas LBL SLAC Emittance growth Losses Relative Lifetime No sextupoles

29. LARP Collaboration Meeting 04/26/2006 - Shiltsev 29 RHIC long-range beam-beam compensator design In CY06 – construct and install a wire compensator in RHIC, downstream of Q3 in IR6

30. LARP Collaboration Meeting 04/26/2006 - Shiltsev 30 AC dipole dB/B measurements Crystal collimation Super-SyncLite e-lenses for Head-on B-B Compensation Crab cavities 1.5TeV Injector in LHC tunnel LER-LHC Optical Stochastic Cooling New Initiatives to discuss

31. LARP Collaboration Meeting 04/26/2006 - 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

32. LARP Collaboration Meeting 04/26/2006 - Shiltsev 32 Work hard and be inventive!

33. LARP Collaboration Meeting 04/26/2006 - Shiltsev 33 Back Ups Slides

34. LARP Collaboration Meeting 04/26/2006 - Shiltsev 34 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 Wire Beam-Beam Compensation Overall Plan

35. LARP Collaboration Meeting 04/26/2006 - Shiltsev 35 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. Stub-shaft (bearing not shown) Support shaft Detail of flex cooling supply tube Relaxed (as shown) # coils 4 O.D.111mm (4.4in) full 360° rotation# coils5 O.D.91mm (3.6in) torque9.1N-m (81in-lb)

36. LARP Collaboration Meeting 04/26/2006 - Shiltsev 36 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 1.3 LHC Collimation R&D

37. LARP Collaboration Meeting 04/26/2006 - Shiltsev 37 L3 Leader: Angelika Drees (BNL) FY06 budget 50 k$ Goals: –The ultimate goal of this sub program is to bench mark code(s), in particular SIXTRACKwColl, in a variety of aspects with RHIC beams. –We plan to install and implement at BNL accelerator tracking code identical with the one used at CERN (K2, SIXTRACK with Collimators, i.e. SIXTRACKwColl) and perform simulations of collimation efficiencies and loss maps which will then be compared to simulation results from earlier studies done at RHIC with other codes (Teapot, K2, ACCSIM) and with data. Various data sets at two energies are available. –During the RHIC proton run collimator setup procedures should be implemented into the RHIC control system and tested with beam under real operating conditions. 1.3.1 Cleaning Efficiency Studies

38. LARP Collaboration Meeting 04/26/2006 - Shiltsev 38 FY2006: –debug the code –compare with other simulation and data, test setup procedures, –finish reports Cleaning Efficiency Studies: Overall Plan

39. LARP Collaboration Meeting 04/26/2006 - Shiltsev 39 L3 Leader: Tom Markiewicz (SLAC) FY06 budget 720 k$ Goals: –The ultimate goal is a successful design for low impedance, high efficiency LHC secondary collimators. The design will be validated with a sufficient but small (1-3) number of prototypes and beam tests. The design specifications and the prototypes are the primary deliverables. The time scale is set by the desirability of testing the prototypes with LHC beam in 2008/09. Then, CERN will decide whether or not to proceed with the rotating collimator design. If a decision is made to proceed, this sub-project will provide an engineering drawing package to CERN and will support the effort to commission the collimators once they are manufactured and installed by CERN. 1.3.2 Rotating Collimators

40. LARP Collaboration Meeting 04/26/2006 - Shiltsev 40 June 15-17 CERN/SLAC Collaboration Meeting Attendees –CERN: Ralph Assmann (Project Leader, Tracking), Allesandro Bertarelli (Mechanical Eng.), Markus Brugger (Radiation Issues), Mario Santana (FLUKA) –SLAC: Tom Markiewicz, Eric Doyle (ME), Lew Keller (FLUKA), Yunhai Cai (Tracking), Tor Raubenheimer Radiation Physics Group: Alberto Fasso, Heinz Vincke Results –Agreement on basic design of RC1 (1 st rotatable prototype) –Transfer of many of CERN mechanical CAD files –Lists of Further studies required Outstanding Engineering Issues requiring more design work Project Milestone List & Action Items List –Test Installation of “New FLUKA”

41. LARP Collaboration Meeting 04/26/2006 - Shiltsev 41 Conceptual Design of RC1 (1 of 2) Mechanics must fit within CERN Phase I C-C envelope –224mm center-to-center with 88mm OD beampipes –1480mm longitudinal flange-to-flange –25mm adjustment/jaw (22.5mm relative to beam w/±5mm allowed beam center motion and use Phase I alignment and adjustment scheme –Two 75cm Cu cylindrical jaws with 10cm tapered ends, 95cm overall length with axes connected to vertical mover shafts –136mm OD with 9mm taper –Each jaw end independently moved in 10um steps –Vacuum vessel sized to provide 8mm clearance to adjacent beam and allow gross/fine 0°, 45°, 90° positions Relaxed mechanical deformation specifications –<25 um INTO beam guaranteed by adjustable mechanical stop(s) Ride on groove deep enough to not be damaged in accident case Adjustable between ±5 and ±15 sigma (2-6mm) & centered on beam –<325 um (750um) AWAY FROM beam @ 0.8E1p/s loss (4E11p/s) Flexible support on adjustment

42. LARP Collaboration Meeting 04/26/2006 - Shiltsev 42 Proposed layout 136mm diameter x 950mm long jaws, vacuum tank, jaw support mechanism and support base derived from CERN Phase I

43. LARP Collaboration Meeting 04/26/2006 - Shiltsev 43 Stop prevents gap closing as jaw bows inward due to heat Jaw ends spring-loaded to the table assemby … move outward in response to bowing May use two stops to control tilt Slot deep enough to avoid damage in accident Stop far enough from beam to never be damaged & is out of way at injection Adjustable gap-defining stop

44. LARP Collaboration Meeting 04/26/2006 - Shiltsev 44 Rigid round-square transition Spring loaded fingers ground two jaws through range of motion Jaw support & gap adjustment borrowed from CERN RF Contact Overview

45. LARP Collaboration Meeting 04/26/2006 - Shiltsev 45 LHC Phase I 2D carbon-carbon Irradiation Specimen at BNL BLIP Facility 117 MeV or 200 MeV BNL LiNAC Protons (depending on the isotope production requirements downstream) Preliminary Assessment: 2D CC specimens normal to the planes of reinforcing fibers and close to the center of the beam (receiving high dose) experienced degradation. Less degradation was seen in the specimens along the reinforcement.  NOTE: Total dose received MUCH HIGHER than what LHC collimator jaws will see. Status: Phase I Carbon-Carbon irradiation completed Sample activation measurements completed Thermal Expansion of specimens started PLANNING of FY06 Post-Irradiation and Follow-up Irradiation Studies

46. LARP Collaboration Meeting 04/26/2006 - Shiltsev 46 Phase-II LHC Collimator Material Irradiation Planned for May 2006 Primary Materials: Annealed Copper and Glidcop (85% Cu – 15% Al) Other Potential Candidates: Super Invar, Gum Metal, Also: 2D Carbon-Carbon and 3D Carbon- Carbon Test for physical properties (thermal conductivity, thermal expansion) And Stress-Strain (mechanical properties)

47. LARP Collaboration Meeting 04/26/2006 - Shiltsev 47 POST IRRADIATION ANALYSIS REVEALED THAT PHASE-I 2D Carbon-Carbon Self Anneals Irradiation Damage through thermal cycling in both strong and weak directions. Therefore, it is expected to meet the 25 micron condition set as goal Annealing along strong (fiber plane) direction Annealing along weak direction Shown is annealing under different levels of irradiation damage

48. LARP Collaboration Meeting 04/26/2006 - Shiltsev 48 PHASE-I: Irradiation and Analysis of 2D Carbon-Carbon at BNL GOALS: Determine resilience of 2D CC against irradiation damage and assess how the critical property of thermal expansion changes with irradiation assembly irradiation Beam exposure and irradiation damage assessment Post-irradiation Analysis At irradiation levels several orders of magnitude than what the LHC collimator jaws will see the 2D CC suffers structurally from irradiation exposure

49. LARP Collaboration Meeting 04/26/2006 - Shiltsev 49 Physics: Long Range @ RHIC SPS :  ~ d 5 [measured 11/09/04] Tevatron:  ~ d 3 [measured in HEP stores, TEL] RHIC :  ~ d 4 or d 2 [measured 04/28/05, scan 4]

50. LARP Collaboration Meeting 04/26/2006 - Shiltsev 50 AC dipole Recent results from the Tevatron Collaboration formed including Fermilab, BNL and CERN. Formal proposal for LHC at this meeting First AC dipole data in the Tevatron

51. LARP Collaboration Meeting 04/26/2006 - Shiltsev 51 SyncLite Fiber: ghost bunches measurement (DeSantis, Byrd, Zolotorev) Time resolution: 50 ps Max integration time: 10 s Sensitivity: 5 10 5 p LHC Requirements Fiberoptic coupler/lens Electro-optic modulator InGaAs PD Fiberoptic PC Fast pulser 50 ps @ 40 MHz Data acquisition board (ADC) 5 10 5 protons emit ~30 photons/turn in a 10% bandwidth. The electro-optic modulator/fast pulser combination can map the entire LHC ring, with the required resolution, every 500 orbits. In the allowed integration time, every single 50 ps-long region is sampled 200 times. A 70% QE photodiode would accumulate >4000 counts. We can estimate a total of -6/8 dB from the coupling into the optical fiber and the various insertion losses. Main noise sources are the modulator extinction ratio (~ 3 10 -3 ) and the photodiode dark current (~ nA)

52. LARP Collaboration Meeting 04/26/2006 - Shiltsev 52 New Initiatives: dB/B Fluctuations Tevatron Stand-Alone Dipole measurements (Proc. PAC’01) 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 Can be measured at CERN MMF and in Tev

53. LARP Collaboration Meeting 04/26/2006 - Shiltsev 53 1.5 TeV SuperFerric Injector in LHC tunnel J.Johnstone T.Sen, H.Piekarz

54. LARP Collaboration Meeting 04/26/2006 - Shiltsev 54 L2 Leader: Michael Syphers (FNAL) FY06 budget 1,140 k$ Goals: –There is an overall benefit to the U.S. high-energy physics program if the LHC turns on rapidly and successfully. Our experimental physics groups have invested heavily in the LHC project, and the science produced there thus represents a return on the U.S. investment. A healthy and strong HEP activity at LHC will surely be necessary to secure future accelerator-based HEP projects in the U.S. The information gained during the commissioning will be available in a timely manner and will have maximum positive effect on U.S. plans for LHC L3 tasks: –Beam Commissioning –Hardware Commissioning –Toohig Fellowship –New Initiatives 1.2 LHC Commissioning

55. LARP Collaboration Meeting 04/26/2006 - Shiltsev 55 FY2006: –S/N study of low intensity bunches in Tevatron –Design pick-up structure, study PLL DAB board for DAQ –complete an “integration document”, signed off by both parties, and entered into CERN EDMS –Design and build front-end electronics Q1 –Joint LARP and CERN review of the proposed design FY2007: –Adapt Fermilab analysis software –Hardware commissioning at CERN without beam FY2008: –Hardware commissioning at CERN with beam FY2009: –Beam studies of chromaticity measurements, ramp effects Schottky Monitors Overall Plan