Difference between revisions of "20171116-JleicBunchFormation"

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(New page: __NOTOC__ = Oct 6 2017 JLEIC Ion Integration Meeting = == Near Term Action Items == * By Tue Oct 3 ** '''Identify''' and '''prioritize''' remaining work...)
 
 
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__NOTOC__
 
__NOTOC__
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= Oct 6 2017 [[JLEIC-Ion-Integration-Meetings|JLEIC Ion Integration Meeting]] =
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=Nov 16 2017 [[JLEIC-Ion-Integration-Meetings|JLEIC Ion Bunch Formation Meeting]] =
  
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== Near Term Action Items ==
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* Todd, Yuhong, Jiquan, Ed, Randy (Vasiliy)
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* By Tue Oct 3
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** '''Identify''' and '''prioritize''' remaining work needed on accelerator segments to deliver relevant consistent pCDR draft sections by '''April/May 2018'''
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** Have input from
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*** Vasiliy ([http://www.toddsatogata.net/JLEIC/2017-10-06/Ion_collider_ring_to_do_list_22sep17.pdf ion collider ring])
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*** Fanglei ([http://www.toddsatogata.net/JLEIC/2017-10-06/2017Sep29_electron_collider_ring_to_do_list.pptx.pdf electron collider ring]; [https://jlabsvn.jlab.org/svnroot/jleic/ELECTRONRING/ short FODO lattice] in [https://jlabsvn.jlab.org/svnroot/jleic/ JLEIC svn repository]!)
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*** Ed ([http://www.toddsatogata.net/JLEIC/2017-10-06/2017-10-06-Booster.pdf ion booster])
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*** Amy ([http://www.toddsatogata.net/JLEIC/2017-10-06/2017-10-06-IonSources.pdf ion sources])
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** Have requested input from Steve (cooler) and Brahim (linac); will continue arm-twisting at collaboration meeting.
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** Identify transport line owners; will likely be Yves (electron) and Todd (ion) at present
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* By Tue Oct 31
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== Objectives ==
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** Draft initial machine segment documentation
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* Summarize existing baseline bunch formation scheme
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** Includes upload of relevant (even draft) best present accelerator segment lattice files to svn
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* Identify any concerns with existing baseline bunch formation scheme
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*** Document should be consistent with, and include references to, svn lattice file version(s)
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* Develop short-term plans to address any concerns
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** Zip file of "template" (Todd's Booster tech note) located [http://www.toddsatogata.net/JLEIC/JleicAcceleratorSegmentTemplate.zip here]
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* Document baseline bunch formation scheme (for TDR and Randy's dissertation)
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** Iterations, if needed, at Fri Oct 20 integration/pCDR meeting
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== pCDR Accelerator Segment Needs ==
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== Current baseline ==
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* Polarized Ion Source (Amy)
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* As Todd understands it :) ([https://indico.bnl.gov/getFile.py/access?contribId=4&sessionId=1&resId=1&materialId=slides&confId=3492 Todd Oct 10 collaboration meeting talk, slide 12])
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* Heavy Ion Source (Amy)
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** All energies are Kinetic!
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* Ion RFQs/Linac (Brahim)
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** All injection space charge limits are set to 0.15
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* Linac to Booster Transfer Line (?)
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* Linac ([https://indico.bnl.gov/getFile.py/access?contribId=5&sessionId=1&resId=1&materialId=slides&confId=3492 Brahim Oct 10 collaboration meeting talk])
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* Ion Booster (Ed/Todd)
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** 200 MHz microbunching structure from linac, up to 10 Hz
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* Booster to Collider Transfer Line (?)
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** H-: 280 MeV
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* Ion Collider Ring (Vasiliy)
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*** 2 mA, 0.5 ms, 1 uC (6.24e12)/pulse
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** [[Media:Ion_collider_ring_to_do_list_22sep17.ppt‎ | Ion_collider_ring_to_do_list_22sep17.ppt‎]]
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*** 90% norm emit (2.3 pi-mm-mrad, 8.8 pi-ns-keV)
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* CEBAF (Jiquan)
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*** rms sigmaE/E 1.0e-4 (or lower, scaled)
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* CEBAF to Collider Transfer Line (Yves)
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** Pb67+: 100 MeV/u
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* Electron Collider Ring (Fanglei)
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*** 0.5 mA, 0.5 ms, 0.25 uC (2.33e10)/pulse
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* Low Energy Cooler (Yuhong)
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*** 90% norm emit (0.8 pi-mm-mrad, 4.6 pi-ns-keV/u)
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* High Energy Cooler (Steve)
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*** rms sigmaE/E 0.8e-4 (or lower, scaled)
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*** Pb30+ to Pb67+ stripping at 13 MeV/u
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== pCDR Accelerator Segment items from Engineering (Tim) ==
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* Booster (Ed, Todd)
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* Ion Sources and Linac
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** 280m circumference ('''Probably will go up''')
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** Status: Limited to basic element list and cost information from Jan, 2015. Basic origin defined.
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** Dispersive injection ('''Probably will shift to non-dispersive injection''')
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** Would like to get models of elements to develop basic CAD layout in NX.
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** h=1 capture, acceleration, compression, and extraction
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** Space and tunnel/vault sizing
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** h=1 bunch rotation to match collider bucket for bucket to bucket transfer
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** Summarize power requirements and cooling needs – parameterization.
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** p: 280 to 7061 MeV (1218 to 8000 MeV total E)
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* Linac to Booster Transfer Line
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*** H- to p charge exchange injection, 350 turns, coasting beam
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** Status: Undefined.  
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** Pb67+: 100 to 1792 MeV/u (1031 to 2723 MeV/u total E/u)
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** Get lattice file
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*** Cooling pulsed injection, several pulses, coasting beam
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** Develop layout
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*** Strip to Pb82+ in transfer line
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** Define start point and connection point to Ion Booster Ring
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* Collider (Vasiliy, Randy)
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** Size and layout of tunnel to connect Ion LINAC tunnel/vault to Ion Booster Tunnel
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** 2153m circumference
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** Diagnostics???
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** Bucket to bucket fast kicker injection
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** Other parameterization???
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** h=28 capture, acceleration
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* Ion Booster
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** RF 2<sup>7</sup> adiabatic bunch splitting at top energy, h=28 to h=2*2<sup>7</sup>=3584
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** Status: Origin defined. Based on TAMU 1.2m model dipole.
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** Bunch compression to 1-1.2cm design bunch length
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** Development of tunnel
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** Barrier bucket, RF shifting as needed to adjust harmonic number (3580-3588)
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** Transition transfer lines in and out
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** p: 7.061 to 100 GeV (8 to 100.938 GeV total E)
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** Kicker
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** Pb82+: 1.792 to 40 GeV (2.723 to 40.931 GeV total E)
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** Diagnostics???
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** DC cooling at injection, ERL cooling at top energy
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** Abort/dump system???
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** Other parameterization???
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* Booster to Collider Transfer Line
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** Undefined.
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* Ion Collider Ring
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** Status: Origin defined – at IP. Basic tunnel layout complete – need to update with overall SF magnet model.
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** Updated lattice file and layout – look at % filled.
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** Resize tunnel to accommodate RF Cavity spacing from floor/wall
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** Feasibility / sizing of SF magnets (11.4m model of dual 4m dipole/quad combo in a single cryostat)
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** Diagnostics???
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** Abort/dump system???
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** Other parameterization???
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** RF HPA system basic model/layout – basic assessment of routing waveguides from surface to tunnel
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* CEBAF
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** Status: Origin of CEBAF is the Origin of all JLEIC Site Layout
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** Need to assess CEBAF Reliability/Availability and its impact on JLEIC Reliability/Availability
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** Need definition of operational scenario, time to fill ECR, top off rate, etc.
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* CEBAF to Collider Transfer Line
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** Status: Very old and outdated lattice file from Yves based on PEP-II LER Dipoles – note that it does not line up with position of the Electron Collider Ring as it sits now
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** Get updated lattice file
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** Develop layout
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** Based off CEBAF Origin – needs start point and connection point to Electron Collider Ring – how does it enter Electron Collider Ring (ideally from above, but latest thought is from below so as not to affect Electron Collider Ring to Ion Collider Ring stacked spacing)
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** Size and layout of tunnel to connect CEBAF to Collider Tunnel
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** Diagnostics???
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** Other parameterization???
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* Electron Collider Ring
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** Status: Origin defined – IP. Basic tunnel layout complete. Model of PEP-II RF Cavity ready for updated lattice. Assessment of “Moving Magnets” for synchronization done – can be adapted to new lattice and magnets. Vacuum elements are PEP-II style.
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** Updated lattice file and layout – look at % fill (or free space for additional, not yet defined items)
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** Resize tunnel to accommodate PEP-II RF Cavity spacing from floor/wall
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** Add synchronization chicanes to layout
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** Feasibility / sizing of new magnets
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** Diagnostics???
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** Abort/dump system???
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** Other parameterization???
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** RF HPA system basic model/layout – basic assessment of routing waveguides from surface to tunnel
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* Low Energy Cooler
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* High Energy Cooler
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* Interaction Region
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** Status: Region layout. 1st cut at IR FFQs and SD magnets – need to assess and iterate. Current model of IR beam pipe – ready for Impedance modeling. Magnet coils modeled.
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** Iterate on magnet models
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** Look at additional magnets for details – skew quads, correctors, anti-solenoids
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** Baseline definition for supports, cryostats, etc.
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** Magnet interactions
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* Engineering Topics
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** Superferric Magnets
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** Normal Magnets
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** SRF
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** Crab Cavities
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** Normal Conducting RF
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** Feedback systems
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** Diagnostics
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** Controls
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Latest revision as of 10:09, 16 November 2017

Nov 16 2017 JLEIC Ion Bunch Formation Meeting

  • Todd, Yuhong, Jiquan, Ed, Randy (Vasiliy)

Objectives

  • Summarize existing baseline bunch formation scheme
  • Identify any concerns with existing baseline bunch formation scheme
  • Develop short-term plans to address any concerns
  • Document baseline bunch formation scheme (for TDR and Randy's dissertation)

Current baseline

  • As Todd understands it :) (Todd Oct 10 collaboration meeting talk, slide 12)
    • All energies are Kinetic!
    • All injection space charge limits are set to 0.15
  • Linac (Brahim Oct 10 collaboration meeting talk)
    • 200 MHz microbunching structure from linac, up to 10 Hz
    • H-: 280 MeV
      • 2 mA, 0.5 ms, 1 uC (6.24e12)/pulse
      • 90% norm emit (2.3 pi-mm-mrad, 8.8 pi-ns-keV)
      • rms sigmaE/E 1.0e-4 (or lower, scaled)
    • Pb67+: 100 MeV/u
      • 0.5 mA, 0.5 ms, 0.25 uC (2.33e10)/pulse
      • 90% norm emit (0.8 pi-mm-mrad, 4.6 pi-ns-keV/u)
      • rms sigmaE/E 0.8e-4 (or lower, scaled)
      • Pb30+ to Pb67+ stripping at 13 MeV/u
  • Booster (Ed, Todd)
    • 280m circumference (Probably will go up)
    • Dispersive injection (Probably will shift to non-dispersive injection)
    • h=1 capture, acceleration, compression, and extraction
    • h=1 bunch rotation to match collider bucket for bucket to bucket transfer
    • p: 280 to 7061 MeV (1218 to 8000 MeV total E)
      • H- to p charge exchange injection, 350 turns, coasting beam
    • Pb67+: 100 to 1792 MeV/u (1031 to 2723 MeV/u total E/u)
      • Cooling pulsed injection, several pulses, coasting beam
      • Strip to Pb82+ in transfer line
  • Collider (Vasiliy, Randy)
    • 2153m circumference
    • Bucket to bucket fast kicker injection
    • h=28 capture, acceleration
    • RF 27 adiabatic bunch splitting at top energy, h=28 to h=2*27=3584
    • Bunch compression to 1-1.2cm design bunch length
    • Barrier bucket, RF shifting as needed to adjust harmonic number (3580-3588)
    • p: 7.061 to 100 GeV (8 to 100.938 GeV total E)
    • Pb82+: 1.792 to 40 GeV (2.723 to 40.931 GeV total E)
    • DC cooling at injection, ERL cooling at top energy
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