2017-10-30

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Director - M. Spata
No report



Accelerator Physics - T. Satogata

Todd Satogata

   Previous two weeks (Oct 16-Oct 27)
     - OPS: BTeam (Oct 17), ATLis cleanup, ORFP update review
     - ADMIN: Peer review NIM paper
     - IPAC18: Editorial board support, SPMS support work
     - JLEIC: Continue assembling documents, pCDR meetings/planning
     - JLEIC: Booster injection scheme work (with Ed), start writeups on
       concerns with lattice and injection foil/scheme requirements
     - ADMIN: Weekly meetings with students (Randy, Eric)
     - ADMIN: Continue annual review process
   Next two weeks (Oct 30-Nov 10)
     - JACOW: Team Meeting travel planning, organization
     - ADMIN: Weekly meetings with students (Randy, Eric)
     - JLEIC: Continue assembling documents, pCDR kick-off meeting?
     - OPS: BTeam (Oct 31, start weekly meets), ORFP update review
     - JLEIC: Continue Booster injection notes, documentation
     - IPAC18: Editorial board support, SPMS support work, travel
       planning for SPC/3 meeting in Jan 2018

Alex Bogacz

   Previous two weeks (Oct 16-Oct 27)
     - ADMIN: Peer review PRAB paper, annual review process
     - ADMIN: Presentation on Jefferson Lab R&D for NP2N3 delegation
     - IPAC18: Start organizing next SPB meeting
     - VACATION: Oct 16-17, Oct 23-24
   Next two weeks (Oct 30-Nov 10)
     - OPS: 12 GeV beam parameter meeting, notes
     - PERLE: End to end simulation development
     - IPAC18: Next SPB meeting, notes and planning

David Douglas

   Previous two weeks (Oct 16-Oct 27)
     - ADMIN: Bonn travel, annual review process
     - JLEIC: continue with tilted solenoid: generate transfer matrix
       (numerical differentiation); start comparing to conventional
       modeling
     - JLEIC: continue responding to any results Chris develops on the
       simple CCR arcs and writing up the simple arc, but some issues
       found with forward wavefront, under investigation by Chris
     - JLEIC: wrote up kicker estimates to provide "straight merger"
       support, TN-17-052 with Tennant and Benson
   Next two weeks (Oct 30-Nov 10)
     - Daresbury travel: prepping presentations (Daresbury Oct 30,
       Liverpool in following week)

Rui Li

   Previous two weeks (Oct 16-Oct 27)
     - ADMIN: Work with the APS Honors Program administrator and past
       chair of the APS DPB thesis award committee on review issues
     - JLEIC: Communicate with Mike Blaskiewicz of BNL and got his
       codes and relevant materials for instability calculations.
       Reading associated references.
     - JLEIC: held meeting with Kirsten Deitrick, Bob Rimmer, Frank
       Marhauser and Shaoheng Wang on impedance study planning: we
       agreed to have Kirsten do a survey of impedance results for
       PEPII e-ring as a starting point, and then work on 3D models
       and impedance calculation.
     - JLEIC: held meeting with Kirsten Deitrick, Tim Michalski, Mark
       Wiseman, Chuck Hutton on status of engineer design, and 3D
       model of impedance-generating elements.
     - JLEIC: Help and discuss with David Bruhwiler and Steve Webb
       of RadiaSoft, and Ilya Pogorelov of Tech-X, in their efforts of
       forming ideas of SBIR topics that will be beneficial to the
       beam physics in the JLEIC e-cooler
   Next two weeks (Oct 30-Nov 10)
     - JLEIC: Organize impedance meeting with RF group and engineer
       group (this would be our final informal impedance team,
       everyone is very enthusiastic!) to get consensus of the
       approach and plan
     - ADMIN: Continue with the APS DPB thesis committee work
     - JLEIC: Test Mike Blaskiewicz’s code and continue to understand
       the physics it covers

Ed Nissen

   Previous two weeks (Oct 16-Oct 27)
     - JLEIC: Note large nonlinear dispersion/chromaticity in Booster lattice
     - JLEIC: Literature search, testing methods of dispersion correction
     - VACATION: Oct 20
   Next two weeks (Oct 30-Nov 10)
     - JLEIC: Compile gear-change experiment ideas, give presentation
     - JLEIC: Start updating Booster lattice for higher energy, more
       space for sextupoles, realistic quadrupole strengths, injection
       area dispersion tuning
     - JLEIC: Coordinate Booster injection development work with Todd

Chris Tennant

   Previous two weeks (Oct 16-Oct 27)
     - JLEIC: redo CSR analysis in CCR "Simple Arc" since I neglected
       to include "csrdrifts" the first time (oops)
     - JLEIC: finally cleared up discrepancy between Bmad and other
       codes (for a quad, anyway) - we believe Bmad uses a drift-kick
       model and we needed more steps/quad to get the required resolution
     - JLEIC: finally got Bmad to cooperate and run CSR and CSR shielding -
       getting a feel for how to run it now
     - JLEIC: wrote up kicker estimates to provide "straight merger"
       support, TN-17-052 with Douglas and Benson
   Next two weeks (Oct 30-Nov 10)
     - JLEIC: begin TN to document all the work done on CCR "Simple Arc"
       analysis
     - JLEIC: begin TN on benchmarking Bmad with elegant CSR models (?)

Randy Gamage

   Previous two weeks (Oct 16-Oct 27)
     - Dissertation writing: Continue coasting beam chapter, tech note
   Next two weeks (Oct 30-Nov 10)
     - Dissertation writing: Hopefully coasting beam chapter, tech note

Accelerator R and D - Y. Zhang



Computational Physics - Y. Roblin

Yves Roblin:
JLEIC:

-Beam Beam simulations continued. Wrote tools to produce tune maps and FMA maps from BB3D output.  
-Models now include non-linear maps from the lattices. Longitudinal transport is modeled as linear. Still working on converting MAD-X/ELEGANT maps to BB3D reference frame for longitudinal optics.
-Preparing slides for talk on beam-beam results, starting gathering info to write the beambeam cdr chapter meetings with terzic et al regarding ghost development and upcoming paper.
-Setting up tools for dynamic aperture scan for the e- ring (with Fanglei)

CEBAF:

-getting ready for fall run, reviewing optics, updating decks with new info.
-Reviewing procedure for the tritium experiments regarding the ion chamber calibrations
-Discussions with HLA of tool prioritization for this fall beam test plans (pathlength tool first)
-Hosted visit of the CEBAF injector for the IN2P3/CNRS French delegation

He Zhang:

-Simulation for DC cooling in the collider ring with fixed bunch length - Did this simulation again and discussed the result with Jiquang. Different with the previous simulation, this time, as we fix the ion bunch length, we also double the change of the momentum spread due the cooling. The cooling effect was distributed evenly in both the changes of the bunch length and the momentum spread. Now if the bunch length is fixed, all the cooling effect is contributed to the change of momentum spread.  After this change, the ion beam momentum spread decreases faster. But the equilibrium emittance and momentum spread remain almost unchanged.
-Simulation for the IBS expansion for proton beam at 40, 100, 200 and 1000 GeV - Simulated the IBS expansion process (without cooling) for the proton beam with the latest parameters of highest liuminosity at 40, 100, 200 and 1000 GeV and discussed the result with Yuhong. (1000 GeV case is for comparision only.) If the transverse direction is fully coupled, it is clear that the higher the energy, the weaker the IBS effect and hence the less increase of the emittance, although the IBS rate only shows a weak dependence on the energy. But if there is no coupling, the horizontal emittance at the 200 GeV increases the most. This is because at the lower energy the vertical emittance increases more. Although the increase of the 4d emittance is inversely proportional to the energy, the increase of the horizontal emittance shows positive related with the energy. To get an idea of the coupling effect, simulations were done for 0%, 20%, 40% and 100% transverse coupling.
-JSPEC development - Change the output format of JSPEC into text based SDDS format. As tested, the SDDS tools can read the output data from JSPEC. Since it is text SDDS format, not binary SDDS format, we can also easily load the file by other programs, e.g. python, if needed.
-Paper on RF heat load and trip rate optimization - Redraw a few pictures as Balsa suggested. Submitted the paper to PRAB.
-Paper on Cartesian tensor based FMM - This paper was rejected by JCP. One reviewer recommend “publish without future adjustment”. But the other reviewer rejected our paper simply because the scaling of the Cartesian tensor based FMM has a higher dependence on the rank of the tensor than other FMM kernels, such as the analytical FMM and the kernel independent one. I am not convinced by this review. This fact on the scaling is well known since 2007 when the first paper on Cartesian tensor based FMM was published. But the Cartesian tensor based FMM has been accepted as a piece of the FMM family and some state-of-the-art FMM library includes the kernel. I wrote a draft of the appeal letter. Waiting for some feed back from Li-Shi before I submit it.
-Finished reviewing the paper for SISC.

Kirsten Dietrick: Reading:

-PEP-II impedances
-RHIC impedances
-HLS-II impedances
-RTFB transform, magnetized beam emittances (drift and Larmor)

Simulations:

-got 3D field map of C50, C100, 2-cell cavity from Haipeng
-ran LERF injector with 1D and 3D maps of FEL booster (2xC50) and UITF/new CEBAF QCM booster (2-cell + C100)
-Haipeng sent 1- and 2-cell CEBAF separator cavities
-evaluated different methods of calculating beam magnetization; three agree across simulations, confident in calculation (after Cooler meeting)
-currently have axially symmetric elements changing magnetization of beam, which may not be physical - currently evaluating

Impedances:

-working on impedance budget, pulling numbers from different machines

Meetings/Seminar:

-Impedance budget/calculation (Rui, Bob Rimmer, Frank Marhauser, Shaoheng Wang)
-Impedance budget/calculation (Rui, Tim Michalski, Mark Wiseman, Chuck Hutton)
-Cooler, presented LERF injector results - got questioned about validity of method used to calculate beam magnetization
-Seminar: Cockcroft Institute, Peter Ratoff
-Cooler, got assigned to simulate separator cavity/dipole combination in GTS (Andrew's merge idea, made simple)
-JLEIC

Misc:

-put in travel requests for IPAC'18 and LINAC'18 (ERL/FEL/COOL in 2019)

Next two weeks: Reading:

-impedances from different machines
-why the magnetization is not preserved going through a solenoid of sufficient strength

Simulations:

-evaluate beam magnetization behavior through axially symmetric elements; when and why isn't it preserved?
-evaluate difference of maximum solenoid field on or off cathode; maybe talk to GTS group
-Andrew's GTS set-up (replace diagnostic beamline with superposition of separator cavity and dipole)
-verify accuracy settings in GPT

Impedances:

-continue pulling numbers from different machines
-start getting components unique to JLEIC calculated if modeled (or modeled if possible)

Meetings:

-Cooler (Nov. 6th)
-JLEIC
-Bas's visit (week of Nov. 6th)
-possibly Riad's group about beam magnetization

Diagnostic Development - K. Jordan