2018-07-20

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In Progress

Director - M. Spata
No report. Accelerator Division Office.



Accelerator Physics - T. Satogata (Interim CASA Department Head)
Todd Satogata

  Previous two weeks (June 25-July 6)
     - JLEIC: pCDR writing, template, EIC lunch, impedance/HE/R&D meetings
     - JLEIC: Peter McIntyre meeting (Jun 26)
     - JLEIC: Summer student work on Booster simulations, training
     - JACoW: JBoD telecon (Jun 29), post/review meeting minutes
     - ADMIN: Leadership/group meetings, staffing input and planning
     - ADMIN: Director Ops review (Jun 26-28)
     - ODU: Continue Randy advising, dissertation draft finalization
  Next two weeks (July 9-July 20)
     - ADMIN: Leadership/group meetings, staffing input and planning
     - ADMIN: Audrey move transition, Li-Shi meeting (Jul 16)
     - JLEIC: pCDR writing, template, EIC lunch, impedance/HE/R&D meetings
     - JLEIC: Complete Booster vacuum tech note calculations
     - JLEIC: Summer student work on Booster simulations, training
     - IPAC18: Finalize proceedings, IPAC'18 delegate survey report
     - JACoW: Publishing script updates, fix PDF index of PAC'95
     - ODU: Randy PhD defense (Jul 12)

Alex Bogacz

   Previous two weeks (June 25-July 6)
     - PERLE: Attend PERLE collaboration meeting (Jun 26, Orsay)
     - PERLE: Attend LHeC/FCCeh/PERLE workshop (Jun 27-29, Orsay)
     - PERLE: Present two talks at above meetings
     - ADMIN: Attend ARIES Muon Collider Workshop (Jul 1-3, Padova)
     - ADMIN: Present two talks at ARIES Muon Collider Workshop
   Next two weeks (July 9-July 20)
     - VACATION: Jul 9-Jul 13
     - ADMIN: Phys Rev Accel Beams paper review

Rui Li

   Previous two weeks (June 25-July 6)
     - JLEIC: Presented the LCBI for Frank's new HOM coupler design at
       the impedance meeting.
     - JLEIC: Assessment of the behavior of collective effects in
       higher current regime of e-beam (E>10GeV), in responding to
       Yuhong's question for the high-energy JLEIC.
     - JLEIC: Collected the e-ring new parameters from Fanglei,
       Vasiliy will later send me new parameters for the p-ring. These
       may change the behavior of LCBI which is very sensitive to
       parameters.
     - JLEIC: Calculated growth time for the transverse coupled bunch
       instability (TCBI) for Frank's new HOM design using ZAP, and
       see no improvement of the growth rate for the new HOM coupler
       design from that of the old one.
     - JLEIC: Working on the Mathematica calculation of TCBI, so as to
       identify the HOM resonance that gives dominant contribution to
       growth rate, so the RF people can work on mitigation of these
       HOM.
   Next two weeks (July 9-July 20)
     - JLEIC: Finish my part of the ICFA newsletter writing
     - JLEIC: Continue to finish the Mathematica calculation of TCBI
       and its comparison with ZAP
     - JLEIC: Summarize the LCBI and TCBI results for exchange with
       the RF people
     - JLEIC: Estimate the resistive wall impedance in JLEIC e-ring
       and ion ring

Edy Nissen

   Previous two weeks (June 25-July 6)
     - JLEIC: Answered LDRD questions posed by reviewers
     - JLEIC: Created presentation slides for LDRD review
     - JLEIC: Determined that the acceleration anomaly in synergia is
       caused by space charge, not bucket shape changes or higher order
       nonlinear dispersions.
     - JLEIC: Gave LDRD Presentation
     - VACATION: June 25, July 2-3
   Next two weeks (July 9-July 20)
     - JLEIC: Work on booster working point simulations to eliminate
       the acceleration anomaly
     - JLEIC: Work with summer student on injection modeling for the
       booster

Chris Tennant

   Previous two weeks (June 25-July 6)
     - VACATION: July 5-6
     - JLEIC: working through issues with cooler to get a consistent S2E
     - JLEIC: re-tune ERL arc to accept longer bunch from injector
     - JLEIC: mBI analysis of cooler "Simple Arc"
     - PERLE: wrap up PERLE TN
   Next two weeks (July 9-July 20)
     - VACATION:  July 16-19
     - JLEIC: seek counsel for path forward with S2E
     - JLEIC: pCDR writing



Accelerator R & D - Y. Zhang
Fanglei Lin

  • Provided JLEIC electron polarization contribution to the ICFA Beam Dynamics Newsletter.
  • Provided the new electron ring parameters to Tim's group, Leigh, Rui and Shaoheng.
  • Working with the student on the storage ring cooler.
  • Miscellaneous: attended a meeting with Peter McIntyre, attended the JLEIC R&D meeting, attended JLEIC cooler project kickoff meeting, attended JLEIC general meeting.


Vasiliy Morozov

  • My main activities in the past two weeks were:
    • Geometry tagging LDRD: simulations and data analysis.
    • Ion beam loss studies: work with Hannah on beam loss simulations
    • Writing of ICFA news letter contribution
  • Main activities planned for the next two weeks:
    • Preparation of DoE R&D quarterly report
    • Ion collider ring design
    • Beam loss studies
    • Writing of ICFA news letter and pCDR


Amy Sy

    • Prepared and gave presentation on LDRD proposal "Laser driven polarized D source for JLEIC" at LDRD review.
    • Working on Skew PIC closeout report.
    • Starting simulations of transverse feedback system in the ion collider ring. Using Elegant lattice with injection optics to study effects of injection errors on beam stability.


Guohui Wei

  • On Leave


Yuhong Zhang

  • Continued development of HE-JLEIC design concept
  • Gave a presentation at LDRD proposal review
  • Started R&D activities on two FOA grants (bunched beam electron experiment and micro-bunching based coherent electron cooling)
  • Continued writing pre-CDR
  • Started editing of ICFA beam dynamics newsletter



Computational Physics - Y. Roblin
Kirsten Deitrick:

  • Last two weeks:
    • Magnetized beam (LEFR PoP):
    -correct magnetization damage after FEL booster with off-axis travel through skew quad (prepping to run/optimize on cluster)
    -start looking at magnetization preservation through merger designs
    • Straight Merger at CBETA:
    -finish data analysis
    -begin simulations
    -present preliminary results in JLEIC R&D meeting
    • eCloud:
    -finish text for preCDR
    -get other cold section magnet properties from Vasiliy/Fanglei
    • Impedance:
    -best/worst case for electron ring impedance scenario
    -meeting (present above + feedback kickers in various machines)
    • Meetings:
    -Impedance
    -Cooler (x2)
    -JLEIC (x1)
    • Misc:
    -DOE Travel to China brief reading
    -Introduction for Summer Lecture Series (x2), subbing for Geoff Krafft
    -Raemaad GPT help (Geoff's student)
  • Next two weeks:
    • Magnetized beam (LERF PoP):
    -look at 3D FEL booster optimization results
    -magnetization preservation through merger designs
    • Straight Merger at CBETA:
    -continue simulations
    -explain discrepancies (qualitative behavior matches relatively well)
    • eCloud:
    -simulate eCloud in quad/sextupole/drift of ion ring using provided parameters (mostly to show density highest in dipoles)
    • Meetings:
    -Cooler (x2)
    -JLEIC (x2)


Yves Roblin:

  • Vacation 7/2 -7/6
  • JLEIC:
    -pCDR writing
    -ICFA paper writing
    -gear changing simulations
  • CEBAF:
    -Bteam
    -prepare ATLIS for August half pass run
    -meeting with Hall A to discuss schedule for the half pass into hall A
    -APEX procedural development and planning
    -model improvement, redoing all the arcs with proper K1 and constraints
  • Next two weeks:
  • JLEIC:
    -pCDR
    -report for FOA 17 supplemental
  • CEBAF:
    -model work, coordinating activity for restart
    -preparing for July 26th OPS prestart talk


Dennis Turner:

  • Last two weeks:
    • Presented ced2elegant and ArcSteer to BTeam 6/26
    • ArcSteer:
    -Odds and ends from BTeam discussions.
    -Completed templates for all 10 arcs and 0R.
    • rayTrace:
    -Discussed requirements with Tief and Yves.
    -Began work on data collection. Studied existing rayTrace code.
    • Minor bugfixes and documentation updates for ced2elegant, etc.
  • Out of town 6/29 to 7/1.
  • Sick 7/2 to 7/3.
  • Holiday 7/4.
  • Next two weeks:
    • Continue work on rayTrace.
    • Continue to get dispersionTool ready for further testing and release.
    • Test ArcSteer in 0R if the opportunity arises.


He Zhang:

  • JSPEC Development

Tested the codes that calculates the electron charge density inside an arbitrary electron bunch. The electron bunch is represented by two million particles, which are generated randomly with Gaussian distribution. The electron are loaded into memory and then distributed into a tree structure of boxes. The maximum number of electrons in each childless box is adjustable. This process only needs to be performed once as long as the electron charge distribution is assumed unchanged during the cooling process. The ions are put into a regular grid and the grid density is adjustable. (A regular grid is used only for testing purpose. In real simulation, ions can have any distribution.) Ions are distributed into the boxes and the charge density around the ion is calculated by the electron number inside the box divided by the box volume. Electron density is plotted for a few different grid sizes and the results show the algorithm works as expected. Numerical noises are noticed in the electron density calculation, which is as expected, and the noises reduce as the grid size becomes smaller. Now it is still not clear how much it will affect the cooling rate calculation. It will be tested later.

I am working on fitting the above electron density calculation code into JSPEC for cooling simulations. It needs more changes in the code than I originally expected. A new model of the electron beam has been added. But several interfaces between several modules have to be revised, because in this model the relative electron speed and temperature can change. The UI needs to be updated, too. This work is still in process.

  • Others
    -pCDR writing: Converted the previous writing into Latex and edited it again.
    -ICFA writing: Wrote about mulita-stage cooling strategy and cooling simulation results for both the proton beam and lead ion beam, based on my IPAC’18 paper and pCDR writing.
    -Tech report: I am writing a tech report about the TPSA/DA package that I developed based on Dr. Lingyun Yang’s code.
    -ICAP trip is approved. I was told by Prof. Berz that my talk should be arranged in the first two days. I plan to stay two nights there.
    -NERSC account: submitted the NERSC AUP, trying to re-activate my account.
    -Reviewed a paper for SIVP.
  • Work plan in the following two weeks
    -Continue writing and polishing the pCDR report
    -Test, finish, and document the JSPEC package of cooling with arbitrary electron beam
    -Test the turn-by-turn tracking packge for JSPEC.



Diagnostic Development - K. Jordan
Kevin Jordan

  • Continued efforts on the testing of LCLS-II cryomodules in the LERF. The cable termination should begin this week - effort has suffered due to lack of man power & priority during the SAD.I continue to inventory parts for mechanical assembly of bridging components & end cans.
  • I have been working with Steve Shuring & Jonathan Creel to ensure the LERF transfer line, 1/4 & full cryomodule get cleaned up & cooled down in the next couple weeks when the CHL is reconfigured for operations. The heaters & waveguide needed to be reconfigured from F100 to C20 style cryomodule.
  • Joined Joe on trip to RadiaBeam, this was a preliminary design review of the SBIR-II high speed, high power wire scanner


Joe Gubeli

  • Worked on a new SLM diagnostic for ARC 7. The layout is nearly complete and am waiting on a few specifications from Mike T to finish the design.
  • Had a progress meeting with Radiabeam on the high power, high speed wire scanner. The meeting was very productive. The design is fairly mature with some modifications requested. A timeline and installation location for the various tests were discussed as well.


Michael Tiefenback

  • More followup on magnet integrator tasks, particularly concerning mis-wired quadrupoles. (Two more were found.) We have to be able to _know_ that we're done on this.
  • continuing assessment (with operator Brandi Cade) of cryogenic heat load calibration vs. JT setting to characterize the linac heat load. The benefit will be to guide a better match of RF heat (Q0 dissipation) against resistive heat so that RF state transitions are more transparent to CHL operation. Still looks promising.
  • Continuing on requirements for diagnostic optimization for SLMs in Arc7A and elsewhere. Still investigating resolution issues with Gubeli and hardware.
  • Preparation for CLAS12 accelerator update talk 10 July.



LERF - S. Benson (Done)

  • July 9-20
    • Worked on pCDR editing
    • Completed Quarterly report for 2018 FOA project
    • Held Cooler ring meetings and wrote up minutes.
    • Analyzed use of harmonic RF to enlarge longitudinal acceptance cooler.
    • Wrote up electron cooling section for ICFA BD newsletter
    • Held status meeting for Electron Cooling FOA project
    • Sent out invitation for mini-workshop for ERLs in an EIC
    • Researched application of CSU equipment so that we might keep the CSU laser at the LERF
    • Review GTS magnetized gun paper


  • July 23-Aug. 3
    • Revise LOD for isotope work
    • Attend kickoff meeting for isotope project
    • Analyze CEC study by Stupakov to derive ERL specifications
    • Attend Operations review
    • Try to define HZDR collaboration
    • Write up cooling section of HE-JLEIC appendix