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US LHC Accelerator Research Program. BNL - FNAL- LBNL - SLAC. Summary of Accelerator Systems New Initiatives Parallel Session. 19 October 2007 LARP CM#9 - SLAC Tom Markiewicz/SLAC. 10 New Initiatives-Thursday 1:30PM.

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summary of accelerator systems new initiatives parallel session

US LHC Accelerator Research Program

BNL - FNAL- LBNL - SLAC

Summary of Accelerator Systems New Initiatives Parallel Session

19 October 2007

LARP CM#9 - SLAC

Tom Markiewicz/SLAC

10 new initiatives thursday 1 30pm
10 New Initiatives-Thursday 1:30PM
  • While money is always tight and FY08 in particular has been allocated with little wiggle room, consensus is that we try to improve LARP system to:
    • Introduce projects early enough to get input from relevant parties: lab partners, CERN, home institution
    • Consider how to have LARP manage, or incubate, LHC projects taken on as part of the lab’s base program
    • Give management more time to request new monies and/or manage existing funds

New Initiatives Summary - T. Markiewicz

irradiation damage in lhc beam collimating materials n simos bnl n mokhov fnal
Irradiation Damage in LHC Beam Collimating MaterialsN. Simos (BNL) & N. Mokhov (FNAL)
  • Request:
    • Fund a CONTINUING EFFORT in irradiation studies
      • 0.3 BNL senior FTE/year plus $180k/year for beam time
    • Funding requested for FY08, FY09, FY10
  • Deliverables:
    • Continued studies of physical properties of already irradiated Phase I and Phase II materials
    • Extension of materials to
      • Exotic composites (Diamond-Metal, Carbon-NanoFiber-Cu, etc.)
      • SC Magnet Materials
      • Crystals
    • Neutron & Gamma studies of materials
    • Study of physical properties as function of radiation dose
    • integrated software package (MARS + Non-linear structural dynamics code) for reliable prediction of radiation effects, benchmarked in dedicated measurements
    • Laser-based shock (high-strain rate) effects on irradiated materials

New Initiatives Summary - T. Markiewicz

lhc optics measurement modeling and correction with model independent analysis mia yiton yan slac
LHC optics measurement, modeling, and correction with Model Independent Analysis (MIA)Yiton Yan (SLAC)
  • Description:
  • MIA is a series of MATLAB programs that has been proven robust for PEP-II optics correction.
  • MIA, via an analysis of turn-by-turn BPM orbit data and an auto SVD-enhanced fitting process, brings the real hardware storage ring to a computer -- the virtual machine that matches the real machine in optics.
  • MIA then figures out a better virtual machine (lower beta beat, lower coupling, lower dispersion beat, etc) for the real machine to emulate and calculates tuning “knobs” to change real machine to the model
  • MIA has helped PEP-II overcome many optics improvement milestones and has had major contributions for PEP-II luminosity enhancement.
  • Goals:
  • Adapt MIA to LHC
  • Strong synergy with AC Dipole program

New Initiatives Summary - T. Markiewicz

mia resource request
MIA Resource Request
  • Manpower
  • Y. Yan: ½ FTE both for FY 2008 and FY 2009.
  • Travel
  • 2 trips to BNL in FY2008
  • LTV (3 month) visit to CERN at machine startup
  • LTV (6 month) visit to CERN in 2009
  • Deliverables:
  • Modify MIA for LHC
    • Identify BPM problems via MIA analysis of LHC optics at startup
    • Develop LHC optics model and start LHC optics improvement (beta beat and coupling correction, etc.) with MIA (2009 goal)
  • Modify MIA for RHIC and benchmark at RHIC at BNL
  • Long term future of continued study of LHC optics via MIA at SLAC with occasional visits as required

New Initiatives Summary - T. Markiewicz

impedance and stability at the lhc karl bane slac
Impedance and Stability at the LHCKarl Bane (SLAC)
  • to build on what CERN has already done, and to collaborate with
  • them on solving impedance/instability questions for the LHC
  • preliminary goal: try to understand SPS impedance/measurements;
  • eventually work to LHC
  • to commit to 0.5 FTE in 2008
  • I would go for 3 months to CERN
  • the other 3 months would be done by me and/or others, working
  • here and/or at CERN
  • others expressing interest in participating – Z. Li, C. Ng, R. Warnock,
  • S. Heifets, G. Stupakov, …
  • it is envisioned that this work would continue past 2008

New Initiatives Summary - T. Markiewicz

proposed impedance tasks
Proposed Impedance Tasks
  • LHC
  • collimator impedance calculations, low frequency resistive wall impedance questions (RA, EM)
  • complete impedance budget – to get realistic impedance of ring (FZ)
  • stability simulations – longitudinal, transverse; macroparticle, linearized Vlasov, etc; simulate experiments with feedback (EM)
  • clearing efficiency of collimators when including wakefields; puzzle
  • of 10 second tails in scraping tests (FZ, RA)
  • effect of impedance on Landau damping (FZ)
  • impedance measurements planning (FZ)
  • coupled bunch instabilities at LHC – participate in shifts (EM)
  • SPS:
  • puzzle in longitudinal and transverse impedance measurements (EM)
  • fast vertical single bunch instability at injection (EM)
  • simulations -- compare with measurements (ES)
  • LHC upgrade:
  • intensity limits (FZ)

New Initiatives Summary - T. Markiewicz

synchrotron light monitors beam loss monitors luminosity dither feedback alan fisher slac
Synchrotron-Light Monitors,Beam-Loss Monitors,Luminosity Dither FeedbackAlan Fisher (SLAC)
  • SLM Collaboration
    • Hutchins is very interested in having an experienced SLM person to devise and execute a detailed commissioning procedure.
      • The remote control room at SLAC then allows an expert in a different time zone to respond to concerns from the CERN control room.
    • Collaboration on the future capabilities may follow.
  • BLMs
    • Dehning was very interested in having an outside look at their evaluation of system reliability.
      • He asked me to read a 2005 PhD thesis on the reliability of the BLM system. I have done so and have begun discussing details with him.
    • This is likely to lead to further collaboration as the system is commissioned.

New Initiatives Summary - T. Markiewicz

instrumentation commissioning continued
Instrumentation Commissioning (continued)
  • Luminosity Monitor Dithered Feedback
    • Bill Turner of LBNL originally intended a dither for LHC using their luminosity monitor.
    • As an LHC upgrade we return to this idea, proposing a feedback based on PEP’s scheme.
      • To begin: which magnets and power supplies are suitable?
    • Participants: Fisher, Wienands, Sullivan (SLAC); Turner, Ratti, Matis (LBNL); Kozanecki (Saclay)
  • Budget (for SLAC/LARP only)
  • depends on LHC commissioning and on coordination with CERN.
    • FY 2008
      • %FTE: 5%
      • Travel: 5 k$
        • One trip for 1 to 2 weeks
    • FY 2009
      • %FTE: 40%
        • Long-term visitor program
      • Travel: 10 k$
        • 2 trips in addition to LTV

New Initiatives Summary - T. Markiewicz

lhc remote control area at slac
LHC Remote Control Area at SLAC

New Initiatives Summary - T. Markiewicz

analysis of phase advance data walter wittmer slac
Analysis of Phase-Advance DataWalter Wittmer (SLAC)
  • At PEP-II, phase-advance data is used routinely to assess state of the optics (ß beat, coupling)
    • Turn-by-turn, 1024 turns, for each BPM
    • Phase and amplitude extraction in RInQ BPM processors.
    • Extract ß functions by comparison with model
  • • LHC will have an AC Dipole & can take similar data
  • • The tricky part:
    • – Dealing with 90°/cell (per BPM) phase advance
      • (Wienands et al., EPAC 2002)
    • – Dealing with imperfect data (noise, non-reading BPM, ...)
  • • At PEP-II this is packaged in the online system
    • – Fortran/C, Oktave (Matlab) prototype exists also.

New Initiatives Summary - T. Markiewicz

phase advance measurement proposal
Phase Advance Measurement Proposal
  • Visit (in FY08) to CERN by Wittmer
    • – Explore possibility of bringing our software to LHC
    • – Explore possibility of collaborating with Fartoukh &Tomas to apply their methods to PEP-II
  • • $3k in FY08 for this visit
  • • Follow-on Request for FY09 to be presented at next CM.
    • – Actual software port & installation.
  • • BNL / Fermilab has an AC-Dipole effort in LARP. We would like to explore joining with them.

New Initiatives Summary - T. Markiewicz

study of beam beam limit in hadron colliders yunhai cai and robert warnock slac
Study of Beam-Beam Limit in Hadron CollidersYunhai Cai and Robert Warnock (SLAC)
  • Beam-Beam lifetime (T. Sen, A. Kabel )
    • Parasitic collision
    • Wire compensation (W. Fischer)
    • Electron lens compensation (V. Shiltsev)
  • Emittance growth due to beam-beam collisions
    • Strong-weak, gives too small values
    • Strong-strong
      • Gives unreliable values due the numerical noise
      • Predicts a beam-beam limit that is a factor of ten larger than in the electron machine

New Initiatives Summary - T. Markiewicz

improving strong strong codes
Improving Strong-Strong Codes
  • Numerical noise in PIC codes
    • Macro particle representation of density
    • Discrete Poisson solver
  • Vlasov-Poisson approach to eliminate the noise due to macro particles
    • 1D code for microwave instabilities was proven very effective
    • 2D beam-beam code was developed by Andrey Sobol. Ported
    • to computers at SLAC
  • A new idea to solve Vlasov, with some advantages of PIC method (lower cost , while keeping low noise)
    • Forward tracking (similar to macro particles)
    • Smoothing by interpolation of data at quasi-random sites
    • Probability conserving algorithm at data sites

New Initiatives Summary - T. Markiewicz

goal and plan
Goal and Plan
  • Compare noise between PIC and Vlasov codes and quantify any improvements
  • To understand emittance growth due to beam-beam in hadron machines at least in relative terms within two years
  • Benchmark the codes against experiments in Tevatron and RHIC, understand the emittance growth at 10% level within five years and compare to the result from LHC
  • Resource:
    • 2 FTE for two years possible extension to five years
    • At least one new FTE (post-doctoral)
    • Maybe a dedicated cluster later

New Initiatives Summary - T. Markiewicz

optical diffraction radiation monitor

Beam

FDR

BDR

Optical Diffraction Radiation Monitor
  • Radiation emitted when a charged particle passes in the vicinity of a conducting target.
    • Two cones (angle ~ 2/γ ) of radiation in the forward and backward direction
    • Key parameters: the impact parameter, beam energy and wavelength of radiation
    • Main advantage: Non-invasive
  • Observables
    • Near field (at or near target) intensity
    • Polarization
    • Frequency spectrum
    • Far field angular distribution
    • Interference
  • Extract
    • Beam size
    • Beam position
    • Beam divergence
    • Energy

New Initiatives Summary - T. Markiewicz

optical diffraction radiation pre proposal tanaji sen fermilab
Optical Diffraction Radiation Pre-ProposalTanaji Sen - Fermilab
  • Design ODR setup in the Tevatron – E0 preferable.
  • Develop a collaboration with US labs and CERN
  • Present proposal to the LARP collaboration for funding a LARP task (April 2008)
  • Proceed with experiments
  • Develop ODR facility for the LHC
  • Determine potential for future machines: muon collider, ILC,…

New Initiatives Summary - T. Markiewicz

slide19

LLRF system - Beam dynamics models for LHCImpedance Control Architectures, Effects of technical implementation on accelerator performanceJ.D. Fox,1 C. Rivetta,1 T. Mastorides,1 D. Van Winkle,1T. Linnecar, 2 P. Baudrenghien,2 J. Tüchmantel2SLAC, CERN

  • AB Dept., CERN, SLAC mutual interest.
  • Propose a concurrent plan of activities including the modeling, analysis and evaluation of LHC RF station performance and beam stability and performance.
  • CERN request - Adapt the PEP-II RF station identification configuration tool to the LHC LLRF task. Optimal situation, develop tool November 07 for use in RF station commissioning.
  • Goals
    • Expand existing RF station models and include in the simulation the low-mode coupled bunch beam dynamics.
    • Quantify the effect of LLRF imperfections and noise in the LLRF implementation on the beam stability and longitudinal dilution.
    • Specify necessary performance for next-generation LLRF systems.
  • Important for LLRF systems in future facilities and up-dates.

New Initiatives Summary - T. Markiewicz

llrf task resource request
LLRF Task Resource Request
  • Phase I (FY2008)
    • 1 FTE Junior, 0.2 FTE Senior Salaries to be covered by LARP.
    • 0.5 FTE Senior Salary, covered by SLAC.
    • Travel: 3 visits x 2 weeks/visit to CERN.
  • RF Stations Configuration Tools - Commissioning Tasks
    • 0.25 FTE Senior Salary to be covered by LARP Commissioning.
    • Travel: 2-3 months at CERN, to be scheduled by CERN needs.
  • Phase II (FY2009) (duration 1 year post Phase I)
    • 0.75 FTE Junior, 0.4 FTE Senior Salaries to be covered by LARP.
    • 0.35 FTE Senior Salary, covered by SLAC.
    • Travel: 3 visits x 2 weeks/visit to CERN.
    • M&S: 15K$ in addition to SLAC R&D contribution for evaluation modules and critical sampler components.

New Initiatives Summary - T. Markiewicz

control of e cloud instabilities in the sps

Block diagram of the prototype damping system tested at PSR.

Control of E-Cloud Instabilities in the SPS
  • Feasibility study of feedback control of e-cloud instabilities in the SPS
    • Participate in SPS instability/e-cloud studies
    • Evaluate feasibility of feedback control (rather than grooves,coatings, scrubbing,..)
    • Propose a solution one year from now (if all goes well)
  • LARP Team: CERN:
  • John Byrd (LBNL) Gianluigi Arduini
  • Miguel Furman (LBNL) Wolfgang Hoefle
  • John Fox (SLAC)
  • Mauro Pivi (SLAC)

Budget request: $75k

New Initiatives Summary - T. Markiewicz

slac component of spd e cloud support request
SLAC Component of SPD E-Cloud Support Request
  • Participation in E-Cloud studies at the SPS
  • Adaptation of SLAC’s transient analysis codes to SPS and LHC data structures
  • Analysis of SPS and LHC beam dynamics studies, comparisons with Ecloud models, participation in LHC transverse feedback system commissioning
  • Technical analysis
    • • Bunch-by-bunch dipole control (existing systems, possible enhancements or upgrades)
    • • Single bunch control (wideband, within bunch Vertical plane)
  • Resources
  • Consistent with J. Byrd request for Phase I
    • • 0.1 FTE Staff (J. Fox)
    • • 0.2 FTE Graduate Student (J. Xu)
  • Based on the Phase I results, a more detailed Phase II proposal in 2009 would
    • • develop the detailed requirements for a new wideband feedback system architecture
    • • key proof-of-principal technology R&D on GHz bandwidth (e.g. 2.5 GS/sec.) processing

New Initiatives Summary - T. Markiewicz