US LHC Accelerator Research Program BNL FNAL LBNL

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US LHC Accelerator Research Program BNL - FNAL- LBNL - SLAC LARP Accelerator Systems

US LHC Accelerator Research Program BNL - FNAL- LBNL - SLAC LARP Accelerator Systems Status, Plans, Questions 14 January 2009 CERN-US Meeting, CERN Tom Markiewicz/SLAC CERN-US Mtg - 14 Jan 2009 LARP Acc. Systems - T. Markiewicz

Personal Preamble Previous LARP leadership had the attitude “We are not a CERN job

Personal Preamble Previous LARP leadership had the attitude “We are not a CERN job shop” Currently, discussion shades to “Why bother if CERN’s not interested” DOE management CONSTANTLY tells us “Fixed sum game, MANAGE, make the tough decisions, LARP can’t do everything…” LARP programs with LARP hard deliverables have not been “on-time; on-budget” – Luminosity Monitor, Rotatable Collimator, Roman pot for UA 9 – Fear of creating a similar but larger fiscal problem if begin a Crab Cavity – Need for better written handshake/documentation obvious – Impact of LHC schedule a touchy but important subject Confusion in the minds of upper level managers between Phase I, II Lumi and Phase II collimation upgrades and LARP/APUL has created some ill will Anything this group can do to help clarify this is helpful LARP has tried to maximize the Accelerator Systems and to draw on non-LARP (i. e. laboratory) resources with some success – Fiscal situation not maintainable & will need to downsize LARP AS program to fund effort currently being “donated” by labs “as an investment” CERN-US Mtg - 14 Jan 2009 2 LARP Acc. Systems - T. Markiewicz

Outline • Introduce LARP Accelerator System task list and what LARP is doing to

Outline • Introduce LARP Accelerator System task list and what LARP is doing to manage them and maintain communication. Invite your candid comments and clarifications – Prioritization – Grade what’s been done – Agreement on Deliverables & Milestones – Adequateness of LARP internal documentation for tasks • Status, reports, documentation, … – Bi-Lateral CERN/Task documentation • Technical specification of agreed deliverables, “Hand-off” criteria, specification of level of CERN/LARP support before & after handoff • Report on Luminosity Monitor recent history and status • Report on Rotatable Collimator • Comments on LLRF, Ecloud, Crab if time allows CERN-US Mtg - 14 Jan 2009 3 LARP Acc. Systems - T. Markiewicz

Task List & FY 09 Budget 2. 9 M$ CERN-US Mtg - 14 Jan

Task List & FY 09 Budget 2. 9 M$ CERN-US Mtg - 14 Jan 2009 4 LARP Acc. Systems - T. Markiewicz

Accelerator System Tasks that have “Finished” By end of FY 07, collaboration on –

Accelerator System Tasks that have “Finished” By end of FY 07, collaboration on – Tune & Coupling feedback – Schottky Monitor – AC Dipole resulted in installed hardware. Uniformly deemed a SUCCESS. – “Hardware” was built to LARP designs by CERN: • no cost or schedule drama – In FY 08 LARP provided modest support for testing, improvements, software interfaces and commissioning and in FY 09 the line items remain with a funds to allow ‘Beam Commissioning’ By end of FY 07 – RHIC Benchmarking of SIXTRACK – MARS-based study of tertiary collimators – Irradiation study of Carbon & Glidcop collimator materials resulted in presentations & publications. Not useless, but value discussable. – Each of these STUDIES is nominally finished – The irradiation study would continue if funds were available to support it CERN-US Mtg - 14 Jan 2009 5 LARP Acc. Systems - T. Markiewicz

Program Oversight My experience as AS Program Leader in FY 2008 has led to

Program Oversight My experience as AS Program Leader in FY 2008 has led to a number of actions Form Accelerator Systems Advisory Committee to parallel Magnet Steering Comm. – Bruning, Fischer, Markiewicz, Peggs/Prebys, Ratti ASAC meets (Webex) at least weekly on general matters or as crisis management team – New Initiative selection – Budget – Collaboration Meeting Planning – Luminosity Monitor Program Management Structure LARP Tasks into units large enough to warrant regular WEBEX meetings and see to it that these are held with additional participation of Program Leader, Deputy, LARP Accel System managers AND CERN Points of Contact – As opposed to semi-annual reports of what Physicist X did at Lab Y for Task Z using his/her favorite simulation code – At CMs, apathy of general LARP membership to anything they are not personally involved in is striking & sad CERN-US Mtg - 14 Jan 2009 6 LARP Acc. Systems - T. Markiewicz

Project Management LARP Acc. Systems is producing hardware for CERN in 3 areas –

Project Management LARP Acc. Systems is producing hardware for CERN in 3 areas – Lumi Monitor – Rotatable Collimator – Roman Pot for SPS Crystal Collimation Expt #UA 9 And is considering delivering a crab cavity prototype My thoughts: – Each of these would ideally be managed outside of LARP – Annual reviews necessary but not sufficient • Aug. 2007 Lumi review & April ’ 08 CM 10 did not foresee June’ 08 ‘crisis’ – Monthly budget reporting without “earned value” necessary but not sufficient – Lumi has convinced me that some external manager(s) must follow progress ~biweekly to fully understand the project in real time so that surprises do not happen – TWM is trying to do this for the UA 9 Roman Pots (reporting to Eric) – No one forces TWM to do this for Rotatable Collimator CERN-US Mtg - 14 Jan 2009 7 LARP Acc. Systems - T. Markiewicz

CERN and LARP Communication Occurs at various CERN levels – CERN Point(s) of Contact:

CERN and LARP Communication Occurs at various CERN levels – CERN Point(s) of Contact: • eg. Assmann (collimation); Bravin (Lumi) – CERN middle managers: Ostijic (IR Upgrade Czar) – CERN key managers: Evans/Myers – CERN LARP contact: Oliver Bruning – CERN Director Roughly mapping onto LARP – LARP Task Leader • Markiewicz (Collimation); Ratti (Lumi) – LARP LAUC/APUL czar (Peggs/Wanderer) – LARP L 1 (Markiewicz) – LARP Program Leader (Prebys) – OHEP (Strauss, Kovar) – US Lab leadership (Kahn-SLAC, Holmes-FNAL, Gourlay-LBL, Roser-BNL) • Oral “story” sometimes inconsistent and full set of players never in same room • Inadequate written correspondence • Improvement in both these areas required CERN-US Mtg - 14 Jan 2009 8 LARP Acc. Systems - T. Markiewicz

LARP Instrumentation Task Meetings Chromaticity Feedback, Schottky Monitor, AC Dipole – No formal periodic

LARP Instrumentation Task Meetings Chromaticity Feedback, Schottky Monitor, AC Dipole – No formal periodic meetings; assume sporadic contact with CERN POCs; reports at parallel sessions of LARP collab mtg (CM) – No direct management oversight Luminosity Monitor – Regular LBL staff mtgs and Ratti/Bravin mtgs during CERN trips – Biweekly status meetings with • Prebys, Markiewicz, Bruning, Peggs, Ratti, Bravin, Corlett (LBL mgmt), 2 LBL EEs – Full grilling by AS at CM#11 followed by plenary report to LARP LLRF Modelling – SLAC 5 person group plus 2 CERN POCs exchange email & visits – SLAC ARD presentations ~6 weeks and CM presentation – No direct management oversight CERN-US Mtg - 14 Jan 2009 9 LARP Acc. Systems - T. Markiewicz

LARP Collimation Task Meetings Rotatable Collimator – Weekly staff (5) mtg at SLAC with

LARP Collimation Task Meetings Rotatable Collimator – Weekly staff (5) mtg at SLAC with web-posted progress report – Biweekly webex/video with CERN collimation group (5 -10 people) – Report at parallel session of CM mtg (3 people attend) & included in plenary summary (to largely apathetic audience) Crystal Collimation – Weekly Webex meeting to which all members of both T 980 (Fermilab expt. ) and CERN SPS UA 9 are invited • Typically SLAC(6), BNL(1) plus Markiewicz, Prebys, Peggs & Scandale (CERN) • Approx. monthly reports from FNAL (Mokhov) on T 980 – – Unknown but large number of bi-lateral UA 9 meetings in Europe Regular meetings of FNAL T-980 staff & FNAL resident visitors Semi annual mini crystal workshops & LARP CM presentations I am personally disappointed that the synergy hopped for between these two complementary efforts is not being realized CERN-US Mtg - 14 Jan 2009 10 LARP Acc. Systems - T. Markiewicz

LARP Accelerator Physics Task Meetings Beam-Beam Simulations in support of Electron Lens & Wire

LARP Accelerator Physics Task Meetings Beam-Beam Simulations in support of Electron Lens & Wire Compensation – No regular meetings to my knowledge – Annual mini-wkshp (eg. 12/3/08 at BNL) & report at parallel session of CM Ecloud: Simulations, SPS Measurements & studies, SPS Vacuum chamber insert studiy – Monthly Webex attended by CERN (3), SLAC (3) and LBL(3) and typically Prebys & Markiewicz – Semi-annual meetings in context of global Ecloud effort (eg. EC Mitigation 08 CERN, 12/08) and CARE series of workshops – Reports in parallel session of CM Crab Cavity – Monthly international webex • UK, KEK, CERN (incl. LARP-residents), BNL, SLAC, FNAL, LBL, AES • Prebys, Markiewicz, Peggs, Strait – Annual mini-workshop, quarterly(? ) mtgs at CERN, LARP CMs & CARE PS 2 – Weekly/biweekly webex with BNL, FNAL, LBL & SLAC w/ Prebys & Markiewicz – CM and CERN organized workshops CERN-US Mtg - 14 Jan 2009 11 LARP Acc. Systems - T. Markiewicz

Many New Initiatives were Discussed at LARP CM#10 -April 2008 BNL The initiatives discussed

Many New Initiatives were Discussed at LARP CM#10 -April 2008 BNL The initiatives discussed were: – LLRF Studies at LHC – Control of Ecloud Instability in the SPS with Transverse RF Damping – SPS Ecloud Remediation via Grooved and Coated Vacuum Chambers – The CRYSTAL collimation test at SPS – An Optical Diffraction Monitor for LHC – Coherent Electron Cooling for LHC – Collimation Studies at LBNL’s HCX facility – Studies of Intensity Dependent Performance Limits to the LHC Injector Chain – PS 2 Studies – Instrumentation Commissioning Proposal – The use of PEP-II “Model Independent Analysis” at LHC – The use of PEP-II “Phase Advance Analysis” at LHC CERN-US Mtg - 14 Jan 2009 12 LARP Acc. Systems - T. Markiewicz

LARP ASAC Meetings Bruning, Fischer, Markiewicz, Peggs, Ratti Initiatives were graded on the following

LARP ASAC Meetings Bruning, Fischer, Markiewicz, Peggs, Ratti Initiatives were graded on the following topics with the first three being considered the most important factors. The CERN point of contact canvassed the relevant parties at CERN to gauge CERN interest and committee consensus was reached on the other topics based on CM#10 presentations and supporting documentation. – Impact on LHC luminosity enhancement – Level of interest by CERN – State of art use of physics or technology – Level of institutional collaboration – Time scale – Average yearly cost – University Involvement – Relevance to the US Program – Whether or not the program would be done in any event without LARP funds – Level of CERN resources contributed to the program – Level of non-LARP US resources contributed to the program – Definite end of program with clear definition of deliverable or result CERN-US Mtg - 14 Jan 2009 13 LARP Acc. Systems - T. Markiewicz

NI Decisions for Spring 2008 While the level of support LARP can provide is

NI Decisions for Spring 2008 While the level of support LARP can provide is in most cases less than that requested by the proponents, the LARP ASAC has agreed to: – Create a LLRF Studies task under Instrumentation – Expand the scope of the existing “Electron Cloud” task to include • Ecloud Simulations • SPS Ecloud Feedback • SPS Ecloud vacuum chamber study – Support the CRYSTAL collimation experiment at the SPS as part of the existing Crystal Collimation task – Create a new “PS 2 Studies” task under Accelerator Physics whose scope still needs more definition but which will include the proposed intensity limitation to the LHC injector chain performance Approved by LARP exec committee Sept. 2008 Prebys letter to all LARP members with announcement CERN-US Mtg - 14 Jan 2009 14 LARP Acc. Systems - T. Markiewicz

Luminosity Monitors 2 per IP + One Spare Preamp/HV Assembly Shaper (& Chassis) Detector

Luminosity Monitors 2 per IP + One Spare Preamp/HV Assembly Shaper (& Chassis) Detector Interface Chassis GAS Distribution/Monitoring Panel PC for Local Monitoring 1 per IP DAQ Firmware CERN-US Mtg - 14 Jan 2009 15 LARP Acc. Systems - T. Markiewicz

Luminosity Monitor Crisis & Response As Lumi is/will be the first LARP produced hardware

Luminosity Monitor Crisis & Response As Lumi is/will be the first LARP produced hardware installed in LHC it is essential that we deliver June 2008 letter from CERN luminosity monitoring group leader Enrico Bravin raised concern that – Lumi might be be late for 2008 run – PMT system would be deployed for 2008 – As long as robust system ready for 2009, no harm Response: 1. Major LARP support in FY 09, before CY 2009 run, to fully complete the system (electronics fabrication, firmware, software & integration) 2. Biweekly meetings of LARP ASAC w/Ratti-Bravin since June 29, 2008 – 13 meetings held with written reports (TWM) 3. Greatly increased involvement of LBL management (Corlett + EE Head) – MS Project maintained by LBL EE & kept up to date 4. Ongoing discussions on how to minimize commissioning cost & handoff CERN-US Mtg - 14 Jan 2009 16 LARP Acc. Systems - T. Markiewicz

Lumi Status: All Hardware on Track for pre. April 2009 Installation & Integration Detectors

Lumi Status: All Hardware on Track for pre. April 2009 Installation & Integration Detectors – 4 detectors in their final configuration at CERN and spare at LBL – Installation will happen upon CERN’s request • CERN activities at point 1 and 5 currently preclude chamber installation Preamps – Two or four needed finished – Protoype unit will be upgraded to “production” version – about 2 weeks behind schedule, but within the float allowed Shapers – Boards ready & chassis panels back from the shops; Need integration – Plan to ship in January Detector Interface Units (2) – Both ready to be shipped (ahead of schedule) Gas Panels – Finished & turned over to CERN • One FM needs to be replaced & gas monitoring software tweaked Firmware – Phase I (Low Luminosity “Counting”) complete – Phase II (High Lum pulse height with centroid deconvolution) a future project CERN-US Mtg - 14 Jan 2009 17 LARP Acc. Systems - T. Markiewicz

Points for Discussion: Luminosity Monitor Satisfaction with currently planned production and schedule Level and

Points for Discussion: Luminosity Monitor Satisfaction with currently planned production and schedule Level and duration of continued involvement of LBL team as luminosity increases Adequacy of current and planned future documentation Agreement on performance benchmarks for system ? ? CERN-US Mtg - 14 Jan 2009 18 LARP Acc. Systems - T. Markiewicz

US LHC Accelerator Research Program BNL - FNAL- LBNL - SLAC LARP Rotatable Collimators

US LHC Accelerator Research Program BNL - FNAL- LBNL - SLAC LARP Rotatable Collimators for LHC Phase II Collimation 1) Adapt rotatable NLC collimator design concept to LHC: “RC” 2) Build and test one collimator jaw with 10 k. W resistive heaters to verify thermo-mechanical performance • Minimize deflection when absorbs with 60 k. W for 10 sec 3) Build a collimator that can be destructively beam tested at new TT 60 facility yet which still rotates, provides clean collimation surfaces, whose cooling system survives and which is UHV 4) Build a 2 nd(? ) fully functional collimator & test it at LHC Gene Anzalone (CAD), Eric Doyle (ME-FEA, ret. ), Lew Keller (FLUKA, ret. ), Steve Lundgren (ME), Tom Markiewicz (Phys), Reggie Rogers (Mech Tech) CERN-US Mtg - 14 Jan 2009 LARP Acc. Systems - T. Markiewicz & Jeff Smith (PD)

Rotatable Collimator Design CERN-US Mtg - 14 Jan 2009 20 LARP Acc. Systems -

Rotatable Collimator Design CERN-US Mtg - 14 Jan 2009 20 LARP Acc. Systems - T. Markiewicz

Rotatable Collimator Manufacturing CERN-US Mtg - 14 Jan 2009 21 LARP Acc. Systems -

Rotatable Collimator Manufacturing CERN-US Mtg - 14 Jan 2009 21 LARP Acc. Systems - T. Markiewicz

RF Transition Piece and “Geneva” Rotating Drive CERN-US Mtg - 14 Jan 2009 22

RF Transition Piece and “Geneva” Rotating Drive CERN-US Mtg - 14 Jan 2009 22 LARP Acc. Systems - T. Markiewicz

RC 0 10 k. W Distortion Test CERN-US Mtg - 14 Jan 2009 23

RC 0 10 k. W Distortion Test CERN-US Mtg - 14 Jan 2009 23 LARP Acc. Systems - T. Markiewicz

Rotating Collimator Drawing Tree not counting prototype pieces, fixtures, redesigns, etc CERN-US Mtg -

Rotating Collimator Drawing Tree not counting prototype pieces, fixtures, redesigns, etc CERN-US Mtg - 14 Jan 2009 24 LARP Acc. Systems - T. Markiewicz

RC Status SLAC team continues to feel optimistic that a fully functional prototype can

RC Status SLAC team continues to feel optimistic that a fully functional prototype can be finished in FY 09. – Materials, fabrication requisitions for 3 new jaws have been placed and some parts are in house Mechanically precise UHV parts are difficult – Accepted 2/6 molydenum shafts with damage – In RC 0, had two major machining & brazing snafus Undermanned relative to CERN Phase II (25 FTEs over 2 years) and underfunded (8 MCHF M&S) “Finishing” and integrating prototype with as many parts and subassemblies as RC in time will be challenging Very good will between Assmann & TWM but need firmer handshake – TT 60 prototype AND LHC prototype – Formal requirements documents • Cu tubing versus Cu. Ni tubing – Level of CERN support – Handoff definition – Commissioning plan CERN-US Mtg - 14 Jan 2009 25 LARP Acc. Systems - T. Markiewicz

Points for Discussion: Rotatable Collimator Program • Assmann/Markiewicz agree to a timeline for a

Points for Discussion: Rotatable Collimator Program • Assmann/Markiewicz agree to a timeline for a technology decision on Phase II Secondary collimators that requires – Adequate LHC running with Phase I collimation system to understand limitations and possible schemes to ameliorate efficiency/impedance issues – Completion of TT 60 test facility (with SLAC participation) and robustness testing of LARP RC prototype & two CERN prototypes – Improvement of 3 designs, if indicated by TT 60 tests, & installation and tests in LHC – Final technology, lattice dependent choice of a set of secondary Phase II collimators • Impact of any decision on “Cold Collimators” on this plan not clear • Current discussions to inclusion of any production of the 30 Phase II secondary collimators as part of APUL and the so-called Phase I IR Upgrade not clear and generates negative comments (“I hear CERN is not interested, so why are we bothering with this”) • Written documentation on what must be delivered, performance specifications, CERN support for delivrables, eventual continuing involvement for commisiopning, etc are sorely needed: How do we ensure task manager(s) supply this CERN-US Mtg - 14 Jan 2009 26 LARP Acc. Systems - T. Markiewicz

LHC LLRF Task John Fox , Claudio Rivetta, Themis Mastorides, Dan van Winkle Why

LHC LLRF Task John Fox , Claudio Rivetta, Themis Mastorides, Dan van Winkle Why SLAC? PEP-II and LHC have same basic LLRF architecture SLAC Group has much unique expertise and well developed set of software tools developed for PEP-II that can be used to configure the LHC system, study it and improve it Progress in 2008 Five multi-weeks trips in April, June 2008, November SLAC software model configured for LHC and interfaced to control system In post-Sept. 19, 2008 world, remote diagnostics more highly valued than ever Near Term Plans 8 person-weeks at CERN in CY 09 for beam commissioning Data from closed loop LLRF system with beam present will be compared against model and changes to LHC hardware configuration suggested Expand model to include feedback & longitudinal emittance dilution Eventually, develop theory & programs to model the long-term (24 hr) behavior Costs Predominately labor provided by SLAC Accelerator Development funds in FY 08, FY 09 CERN-US Mtg - 14 Jan 2009 27 LARP Acc. Systems - T. Markiewicz

Sample LLRF Result Open Loop Xfer Function from timedomain excitation technique vs. model result

Sample LLRF Result Open Loop Xfer Function from timedomain excitation technique vs. model result (green) CERN-US Mtg - 14 Jan 2009 28 LARP Acc. Systems - T. Markiewicz

Transverse RF Feedback in SPS to Control Beam Instabilities Produced by Electron Cloud Effects

Transverse RF Feedback in SPS to Control Beam Instabilities Produced by Electron Cloud Effects Focus Ecloud simulation effort on effects expected in SPS that could be mitigated via techniques pioneered by US labs SPS Ecloud dynamics studies predict Horizontal - coupled-bunch behavior Vertical - single bunch-like instability 2008 Plan (continuing in ’ 09) Measure & quantify Ecloud effects on beam (instrumentation) Compare measurements with E cloud/beam models ≥ 2009 Plan Develop beam-FB simulation, evaluate possible feedback implementations. Propose a technical implementation & develop Engineering Specs Proof of principle experiments & technical R&D Eventual possible LHC construction project item CERN-US Mtg - 14 Jan 2009 29 LARP Acc. Systems - T. Markiewicz

Grooved Vacuum Insertion Test at the SPS for Electron Cloud Studies Electron cloud mitigation

Grooved Vacuum Insertion Test at the SPS for Electron Cloud Studies Electron cloud mitigation test chambers for SPS in prep SLAC is manufacturing two grooved insertions Metal folding & razor blades techniques for 1 mm max. height Installation & Testing planned Metal Folding: Form multiple folds. [EMEGA Company, USA] CERN-US Mtg - 14 Jan 2009 Brazed-up Assembly: Use individual razor type foil blades 30 LARP Acc. Systems - T. Markiewicz

CERN-US Mtg - 14 Jan 2009 31 LARP Acc. Systems - T. Markiewicz

CERN-US Mtg - 14 Jan 2009 31 LARP Acc. Systems - T. Markiewicz

T 980 and UA 9 Single-particle dynamics study brings knowledge applicable to LHC using

T 980 and UA 9 Single-particle dynamics study brings knowledge applicable to LHC using Si tracking detectors in Roman Poys Improved T 980 Goniometer and October 2008 Channeling Results 152 mm x-y Dual sided Roman Pot for UA 9 manufactured by LARP/SLAC CERN-US Mtg - 14 Jan 2009 32 LARP Acc. Systems - T. Markiewicz

Points for Discussion: Crab Cavity Plan for proof of principle experiment at LHC –

Points for Discussion: Crab Cavity Plan for proof of principle experiment at LHC – One cavity/cryostat system or two? – Location, available space, infrastructure, time scale for installation & removal – Fabrication details, cost & schedule – Measurements to be made and definition of success – Management of multilab effort with LARP, CERN and industry Relevance to final configuration – Local (2 per beam per IP) versus global – Time scale, cost, etc. – Studies (e. g. collimation) CERN-US Mtg - 14 Jan 2009 33 LARP Acc. Systems - T. Markiewicz

FY 09 Challenges in Accelerator Systems Deliver Luminosity Monitor and end task Deliver RC

FY 09 Challenges in Accelerator Systems Deliver Luminosity Monitor and end task Deliver RC Prototype and scale back task Launch Crab Cavity with correct level of effort ($), matching CERN interests & schedule Craft and launch PS 2 program Work effectively with CERN on collimation component of APUL Synergize T 980 and UA 9 crystal collimation teams and control costs of UA 9 Roman Pot CERN-US Mtg - 14 Jan 2009 34 LARP Acc. Systems - T. Markiewicz