Difference between revisions of "20170113-JleicIonIntegration"

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(New page: __NOTOC__ == Sep 23 2016 JLEIC Ion Integration Meeting ''(and Notes)'' == ==== Ion linac parameters and extending linac baseline files to high energy (Todd) ==== * Added the [[Ion_Linac_P...)
 
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__NOTOC__
 
__NOTOC__
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== Sep 23 2016 JLEIC Ion Integration Meeting ''(and Notes)'' ==
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== Jan 13 2017JLEIC Ion Integration Meeting ==
  
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==== Ion linac parameters and extending linac baseline files to high energy (Todd) ====
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==== Parameter Updates ====
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* Added the [[Ion_Linac_Parameters | ion linac parameters]] to the [[JLEIC_Baseline_Parameters | JLEIC baseline parameters]] page.
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* Yuhong presented a strong cooling parameter update at the [https://casa.jlab.org/wiki/index.php/MEIC_R%26D_Meeting_%282:30_PM_Thursday%29#2017-01-12 Jan 12 2017 JLEIC R&D Meeting].
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** ''Ed et al. pointed out that the pulse charge of o(<math>10^{16}-10^{18}</math>) on the wiki is clearly incorrect, perhaps by as much as <math>10^6</math>. Todd reviewed his calculations and found a <math>10^6</math> error, and fixed the spreadsheet and PDF. This should also resolve observations Ed had about space charge challenges at low energy.''
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* This included some substantial impacts on a broad set of parameters for JLEIC.
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* Added TRACK code and supporting lattices to the [https://jlabsvn.jlab.org/svnroot/jleic/ JLEIC svn repository].
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* Rui is also starting to develop a work and priority plan for impedances/instabilities this calendar year.
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* These parameters are currently only modeled for the low energy (134 MeV p, 44 MeV Pb) option.
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* Discuss and set out objectives for next few months:
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** That lattice was designed and delivered by P. Ostroumov, B. Mustapha, and A. Plastun (ANL).
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** Parameter updates at [https://casa.jlab.org/wiki/index.php/JLEIC_Baseline_Parameters the baseline parameters wiki page]
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** [https://casa.jlab.org/satogata/web/2016-09-23-JleicIonInjectorLead-EvsS.pdf Plot of low energy lead energy vs S]
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** Include derived quantity spreadsheets for input to impedances/instabilities, c.f. [http://casa.jlab.org/JLEICParams/IonLinac/JLEIC-IonLinacParams.pdf ion linac parameters spreadsheet].
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* Consulted earlier this week with Peter Ostroumov about the best way to extend the linac to high energy (280 MeV p, 100 MeV Pb)
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** These can be placeholders/skeletons as we start filling in things, but will identify parameters that we need to define.
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** Do not need additional types of HWR cryomodules with different cavities; existing cavities optimized for beta=0.3 will do.
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* Have about 7.5 MeV of energy gain per cryomodule for Pb, so need 8 more beta=0.3 cryomodules in linac for high energy.
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** This is despite final high-energy option betas of 0.64 (p) and 0.43 (Pb).
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* Expect to have parameter and lattice update for high energy option before collaboration meeting in two weeks.
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* ''Several people noted some concern about the length of the high energy linac variation. Todd will produce a lattice and we will check the site constraints.''
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==== Summary of current state of ion beam formation plan (Jiquan) ====
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==== Ion Source R&D at LBNL ====
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* [https://casa.jlab.org/satogata/web/2016-09-23-JleicIonIntegration-BunchFormation.pptx Bunch Formation Scheme] (from Jiquan email Jun 24 2016)
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* Mike was at LBNL for an 88-inch cyclotron ops review this past week
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* ''Jiquan noted that he sent around a bunch formation document to some folks in late June; not much has changed since then. This will be used as the basis for the collaboration meeting talk.''
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** Link to [https://conferences.lbl.gov/event/75/ review slides etc].
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** ''This design has 4-6 binary splits in the collider ring, with maximum bunch length limited by injection kicker rise time.''
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* One item worth noting is their ECRIS ion source R&D for VENUS and MARS.
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* ''Vasiliy noted that there is some concern about acceleration of long bunches and the impact on collider ring ramping time.''
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* We will briefly discuss any possible implications. Note that Amy came to us from LBL!
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* ''Todd also noted there is some more general concern about the collider ring ramp design, including longitudinal emittance, momentum spread, transition crossing etc.''
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* ''Todd has some tools from Brookhaven to start looking at initial parameters for ramp design. We will iterate through ramp design and bunch formation implications in future meetings.''
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==== Comments on preliminary space charge studies for Booster injection energy options (Ed) ====
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* ''Ed noted that beam pretty much immediately dies with the existing low energy linac parameters in the wiki.''
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* ''We noted that the pulse charges are obviously too large and miscalculated.''
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* ''Todd updated the wiki parameters for the linac bunch intensities and will work with Ed to establish new space charge estimates.''
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==== AOB ====
 
==== AOB ====
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* Amy is splitting a talk on ion sources with Vadim Dudnikov at the collaboration meeting.
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* Last meeting we noted: ''Yves is working with Rui and others to start developing an impedance budget'' -- progress?
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* ''Yves is working with Rui and others to start developing an impedance budget''
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** ''This partly uses ZAP for some calculations, but some calculations (e.g. IR region beampipe) require calculations with approximate expected geometry.''
 
** ''This partly uses ZAP for some calculations, but some calculations (e.g. IR region beampipe) require calculations with approximate expected geometry.''
 
** ''Todd is also concerned about BPM designs for the collider ring with long and short bunches (before and after splitting).''
 
** ''Todd is also concerned about BPM designs for the collider ring with long and short bunches (before and after splitting).''
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== Attendance ==
 
== Attendance ==
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* ''Jiquan Guo, Geoff Krafft, Fanglei Lin, Tim Michalski, Vasiliy Morozov, Yves Roblin, Todd Satogata, Amy Sy''
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* ''TBD''

Revision as of 13:38, 13 January 2017

Jan 13 2017JLEIC Ion Integration Meeting

Parameter Updates

  • Yuhong presented a strong cooling parameter update at the Jan 12 2017 JLEIC R&D Meeting.
  • This included some substantial impacts on a broad set of parameters for JLEIC.
  • Rui is also starting to develop a work and priority plan for impedances/instabilities this calendar year.
  • Discuss and set out objectives for next few months:

Ion Source R&D at LBNL

  • Mike was at LBNL for an 88-inch cyclotron ops review this past week
  • One item worth noting is their ECRIS ion source R&D for VENUS and MARS.
  • We will briefly discuss any possible implications. Note that Amy came to us from LBL!

AOB

  • Last meeting we noted: Yves is working with Rui and others to start developing an impedance budget -- progress?
    • This partly uses ZAP for some calculations, but some calculations (e.g. IR region beampipe) require calculations with approximate expected geometry.
    • Todd is also concerned about BPM designs for the collider ring with long and short bunches (before and after splitting).
    • Vasiliy noted that Roman Pots in the ion collider ring at <math>\approx 10\sigma</math> may also have significant impedance impact.
    • Tim notes that an engineering team is starting to assemble to evaluate integration needs, e.g. power supply/magnets. BPM and instrumentation design may be part of this.

Reference Materials

Attendance

  • TBD
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