LARP Accelerator Systems: The Meeting Outcome unpolished view

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LARPAccelerator SystemsThe Meeting
Outcome(unpolished view)
US LHC Accelerator Research Program
bnl - fnal- lbnl - slac

• Vladimir Shiltsev

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FY07 AS Priorities Goals

• Lumi-Monitors construct, install, start
  commissioning
• TuneCoupling FB deliver design, participate in
  installation and commissioning
• Schottky participate in installation and
  commissioning
• Hardware Commissioning execute the plan (5-7
  people)
• Beam Commissioning develop detailed Long Term
  Visitors TV plan for FY08 by mid-FY07
• Other tasks execute Task Sheets Plans
• 51 develop FY08 plan (incl. new tasks) by
  June07

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1.1.1 Tune Coupling FB (310k)

• Excellent progress with design and tests in RHIC
  with protons (Run 6)
• Many new phenomena in Run 7 Gold-Gold
• Not clear whether relevant to LHC but shows
  possible areas of concern
• Successful Proof-of-principle continuous
  head-tail Q with BBQ at Tevatron
• Of interest for CERN, still some qs remain
• The task could be wrapped up in FY07
• commissioning efforts and costs could be moved
  to Commissioning task
• Very importants to participate in commissioning
  (one of deliverables LARP subscribed into, also
  excellent plug-in to beam commissioning, LHC
  beam physics, etc)
• New Quadrupole mode analysis proposed (below)
• LAFS is going to develop saftware for tune msmnt
  system

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1.1.2 Luminometer (994k)

• No delays, everything more or less on track
• Thanks to RHIC Run 7 important tests
• Installation in LHC will start in Oct07
• No gas flow thru ionization chambers initially
  (only when L will be high)
• Reference transistors added to quantify dark
  current vs rad dose
• DAQ and control system development to be done
  later
• Estimated FY08 need 880k
• About half of that can be qualified as
  commissioning
• About 400k will be needed in FY09
• Pulse shaping, commissioning, etc
• Getting extra funds in 2nd half of FY07
  (contigency funds) will reduce FY08 budget
  request

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1.1.4 4.8 GHz Schottky (122k)

• Everything is on budget and on-time
• May 1-11 visit to CERN
• Starts commissioning period no beam ? with beam
• Tevatron is already interested in the new
  electronics developed for LHC (ordered the same
  for operation better S/N)
• RHIC is interested, too!
• The task is essentially finished
• formal sign-offs after first beam tests
• commissioning efforts and costs could be moved
  to Commissioning task
• Very importants to participate in commissioning
  (one of deliverables LARP subscribed into,
  another excellent plug-in to beam
  commissioning, LHC beam physics)
• Overall promise to become a success story
• Can LAFS took over data processing software?

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1.1.5 AC Dipole (80k)

• Figured out the way to do that inexpensively
  using existing kicker (pinger) magnets and
  commercially available high-power audio
  amplifiers
• Excellent results in the Tevatron
• 3sigma oscillations for gt8000 turns
• Deeper insight into physics processes
• Beta-functions agree with other methods
• Some 20k of MS and 140k will be requested for
  FY08
• Also, has significant commissioning component

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2.1 Commissioning (540k)

• Hardware and IR commissioning go as planned
• Three more HW commissioners scheduled
• First HW commissioners will start to return
• FY08 plans to be reconsidered to incl Shutdown
  work
• Beam Commissioning
• LTVAC came out with 12 real names of LTVs and 5
  possible substitutes/later names (out of 70
  expressed interest)
• Thanks to Mike S. and the Committee!
• Now on me and, later, Steve, to take into
  account
• CERNs input (names are being considered, input
  next week)
• Balance Junior/Senior, Labs, tasks, LTV/Short
  term Visitors, HW comm.,need of a local
  coordinator, budget (with Mikes input/analysis)
• and come out with a plan and backup option(s)
  for FY08 and (in part) FY09 by June (?)

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LHC_at_FNAL and LAFS (0k)

• Will define how to use LHC_at_FNAL (Tan and Rama) in
  2 weeks
• draft wish list of functions for remore
  participation in SPS commissioning and MDs in
  June-July 2007
• Pre-CERN training
• (Dave McGinnis) are there rookie books?
• (Alex Chao) how SLAC people can benefit from the
  LHC_at_FNAL?
• (Oliver) start plugging in short term
  visits and then continue training/participating
  here
• LARP/other labs to support LAFS - ?
• (Dave McGinnis, Hermann and Steve P. to talk)

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3.1.1 Cleaning Eff Studies (50k)

• Compare RHIC loss maps with code prediction
• To benchmark the code used for the LHC
  Collimation system design
• Obvious progress
• Guillaume Robert-Demolaize
• 4-6 mos needed to comlete the first round of
  analysis
• If no outstanding problems found close the task
  and move on new initiatives? (TBD)

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3.2.1 Rotating Collimator (783k)

• Goes as planned
• CERN strategy for Phase II
• Compare 3 competing technologies at the SPS
  beamline
• RC is one of them
• No good idea yet for ion primaries (secondaries?)
  
• Will need same funds in FY08 (and 09)

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3.2.2 Tertiary Collimators (15k)

• A lot of results reported/ delivered to CERN
• (more results, more interest, more questions,
  more details to explore)
• Might be a never-ending story
• Can the task be finished in FY07? (TBD)
• (remaining small efforts can be buried in a
  bigger task)

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3.2.3 Irradiation Studies (82k)

• A lot of results reported
• Very thorough studies (as usual), tons of data
  analysis
• No bad surprises (contrary to Carbon-carbon)
• Can the task be finished in FY07? (TBD)
• Can BLIP facility be used for other tasks or new
  initiatives? (TBD)

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4.1 Accelerator Physics (635k)

• E-cloud
• new results, still of interest and importance
• Focus shifting from LHC to inectors
• IR and beam-beam
• Too many IR upgrade options on the table, a lot
  of effort needed to consider main 4 (Olivers
  lists) on systematic basis
• Available US resources 1.5 lattice-ists at
  FNAL, 1-2 at SLAC(?)
• Are slim magnets needed? Magnet people waiting
  for answer (may take another year before the dust
  will settle)
• Important reliable(!) beam-beam
  simulations/predictions
• B-B-wires construction is over, studies started
• Some funds can be redirected into (similar) new
  initiative(s)

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New Initiatives (list)

• Collider Instrumentation
• BBQ-based Quadrupole Monitor
• Synch light based diagnostics
• Physics
• LHC Crystal Collimation Scheme
• LHC Electron Lenses
• Modeling of LLRF Limitations on LHC Performance
• Crab Cavities
• LHC Injectors
• The Low-Energy Transverse Emittance Project
• Super-Ferric Fast Cycling Injector in the SPS
  Tunnel
• LHC injectors Upgrades, space-charge effects

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QMM-based e measurement (P.Cameron et al)
monopole (sum) (LRUD) dipole
(difference) (L-R) / (LR) (U-D) /
(UD) quadrupole m (LR)-(UD) / (LRUD)
sx2 - sy2 x2 y2 for xy0 (and
dispersion 0) m exbx eyby
given the b functions, we have one equation with
2 unknowns use two locations/pickups (with
differing b functions!)
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Quadrupole Moment Monitor

• Novel developments combined
• Employ BBQ with its hude dynamics range
• Use Quadrupole Transfer Function (ATF) method
• Excite at 2xf_betatron and observe emittances on
  ramp
• Complement SyncLite and IPMs
• Could be tested in RHIC
• Requested 0.3FTE support and little (15k) MS
  funds

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Longitudinal Density Monitor(S.DeSantis et al)

• Couple SyncLite to optical fiber, deliver signal
  upstairs and process it there with
  electro-optical modulator

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LDM

• Encouraging tests at the ALS
• -5dB coupling
• Of interest for the LHC
• There is transverse SyncLite diagnostics
• Longitudinal diagnostics Resistive Wall Monitor
  
• LDM promises 25-50 ps slice diagnostics? tails
  and abort gap dynamics, etc phenomena of
  importance for operations
• Smth like LDM is in LHC Phase II wish list

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LLRF Modeling (J.Fox)

• Bring PEP-II experinece in the LHC RF
  optimization
• Nonlinear implementations of klystron, RF
  amplifiers, filters and FB loop optimizations,
  etc
• Optimization and participation in commissioning

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Longitudinal Density Monitor(S.DeSantis et al)

• Couple SyncLite to optical fiber, deliver signal
  upstairs and process it there with
  electro-optical modulator

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Crab Cavities KEK-B 22mrad

• Successful Operation
• 10s for KEK
• Stable enough for LHC

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Crab Cavities for LHC

• Some 10-100 luminosity gain (beta25cm?10cm)
• Phase I
• Realistic simulations for emittances and RF
  curvature
• Prototype 800Mhz cavity (2 cell) - ?
• Small crossing angle consideration 400 urad
• 10-15MV 2x2 cell cavity
• Scale 3.7M
• Can get a lot of knowledge/input/help from KEK
  and US labs
• KEK is interested in LHC crab cavities (postdoc
  coming to CERN)
• Synergy possible with ILC crab-cavity
• Moderately difficult, large benefit! (R.Calaga)

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Two-Stage Collimation Crystal as Primary
Courtesy R. Assmann
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Crystal Collimator

• Two plane proton collimation system test at
  Tevatron in FY08-09 (68 hrs of study time)
• SLAC-BNL-FNAL
• CERN-INFN-IHEP-Gatchina
• CERN supportive (endorsed by R.Assmann)
• Italy can deliver 2nd goniometer (vert)
• Long list of studies
• Deliverables
• Demonstration of predicated background reduction
  in Tevatron (better than W primaries)
• Answer operation-related questins (volume
  reflection vs channeling, radiation effects on
  crystals, etc.)

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LHC Electron Lenses
Tevatron Electron-Lenses demonstrated
Beam-beam compensation
1.2A DC e-beam can compensate head-on tune spread
in LHC
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LHC Electron Lens(es) Proposal

• BNL-FNAL-SLAC and CERN
• Of highest priority explore feasibility of
  head-on beam-beam compensation
• Proposed 5 yr plan explain TEV results ?
  simulate BBC for RHIC and LHC ? build and test
  RHIC EL ? proceed with LEL
• LARP plays role at initial stage (modeling ,
  simulations
• 1.5-2 FTE postdoc)
• Construction to be supported from different
  funds
• REL by BNL
• LEL - by IRUP or CERN or both
• Other uses to be considered in detail
• Hollow beam collimator (Vladimir and Ralph)
• Short-long-range compensation (Jean-Pierre)
• Pulsed beam bunch-by-bunch compensation (JPK and
  Vladimir)

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Low Energy Transverse Emittance Project (D.Moehs)
Propose to build a standard candle
At 50-100kV emittance measurement is not
simple! But very important
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LETEP

• A lot of interest from CERN (new 3MeV test
  facility)
• LBNL and FNAL can design and build the monitor
• 1.7FTE and 50k in FY08 (09?)
• Proposed plan
• Design
• Build
• Test and compare at FNAL (with 2 other monitors)
• Test at CERN 3MeV facility
• Build another one to test at other
  labs/facilities in US

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SuperFerric Magnets for LHC Injectors
Can help not only collider but Neutrino program
as well (2 sec cycle)
SPS upgrade for 300M!
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SuperFerric Magnets for LHC Injectors
Can help not only collider but Neutrino program
as well (2 sec cycle)
SPS upgrade for 300M! (H.Piekarz). Not from
LARP funds !!
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Space-Charge Effects for LHC Injectors Upgrages

• FNAL (M.Popovic, et al) and CERN
• Benchmark ORBIT code and simulate SC effects in
  all relevant machines in the LHC injector chain
• Experiments in FNAL Booster (400MeV), CERN
  Booster (50 MeV and 160 MeV)
• Results to be reported in reports, ORBIT
  modifications may follow

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Summary

• Very efficient Collaboration meeting
• Many open friendly discussions, like workshop
• Thanks to
• L2 task leaders for organizing working sessions
• People presented new proposals, reported progress
• LTV advisory committee delivered what was asked
• Our CERN colleagues for coming and playing
  important role in discussions and help in setting
  directions for the next year(s)