# Difference between revisions of "2017-03-03"

From Administrative

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'''Computational Physics - Y. Roblin <br>''' | '''Computational Physics - Y. Roblin <br>''' | ||

+ | He Zhang | ||

+ | - Cooling simulation - Found and fixed one bug when implementing tracking in the cooling simulation. Performed some simulations with various parameter sets. In these simulations, the transverse rms bunch size of the ion beam changes from 33% to 100% of the electron beam radius, and the longitudinal rms length of the ion beam changes in the same manor to the electron bunch length. Made plots of the dynamic invariants of the ions w.r.t. their initial positions or initial dynamic invariants. I did observe different patterns for different ion bunch sized, compared with the electron bunch size. However, now I can’t explain the results and draw a solid conclusion. In these simulations, the ions with similar initial position have different dynamic invariants and different momentum. The ions with similar dynamic invariants have different position and momentum. Averaging of the inhomogeneous parameters makes it more difficult to understand the results. I’m planning to make more simulations with more specific parameter values, which may help to more deeply investigate the problem. | ||

+ | - Dust particle transport - Read more about the longitudinal motion of the dust particles. Now I understand there are two mechanisms for the dust particles to gain longitudinal momentum. One is due to the change of the electron bunch profile. The other is the Moller scattering of the beam electrons with the atomic electrons inside the dust. The latter one dominates when the mass-to-charge ratio is very large. Finished the slides to summary the dust particle transport theory and formulas. Had a discussion with Rongli about the value range of the parameters. Rongli provides his estimates on some parameters and also provides some documents. I haven’t got time to do any calculations. Rongli also points that the dust particle may moves in the opposite direction of the beam motion, according to their observation. | ||

+ | - Cooling theory study - Read Chapter 1.1 (till page 20) of Slava’s thesis and made slides on the contents. Had a two-hour meeting to present and discuss the slides with Slava and Yuhong. | ||

+ | - Trip rate/heat load optimization - Generates new plots to compare the gradients of the multi-object optimized setting with those of the trip rate optimized setting used in operation. In the new plots, both groups of gradients are normalized by the maximum gradient in the group. | ||

+ | - LDRD for FY2018 - Proposed to write a proposal for LDRD fund for FY2018. The purpose is to extend the capability of GHOST for the simulation of non-Gaussian beam collisions, for which the FMM will be used to calculate the Coulomb interaction of non-Gaussian beams. The proposed work includes: 1. Investigate parallel FMM framework: pkifmm and exafmm; 2. Select one of them and make sure it runs with good parallel efficiency in CPU-GPU hybrid cluster; 3. Insert our FMM kernel into the selected parallel FMM framework; 4. Implement FMM in GHOST; 5. Run a few benchmark cases for beam-beam with Gaussian or non-Gaussian beams. I am writing the LOI. | ||

+ | - Submit a proposal for SULI summer student program. - Got the following notice: “The offer extended to Zachary Abrams Dunlap-Tunnage was accepted on 2/17/2017 11:34:39 PM. The offer was to work with He Zhang on Space charge field calculation with a boundary of arbitrary geometry.” | ||

+ | |||

+ | Yves Roblin | ||

+ | Organized the simulation parallel session for the upcoming collaboration meeting. All speakers are now confirmed: | ||

+ | - Ji Qiang TBD (Beam beam 3D simulations with FFB and crabbing but he has not send me the title yet) | ||

+ | - Jean Luc Vay "Berkeley Lab modeling tools for electron cloud build-up and effects on beam transport" | ||

+ | - Balsa Terzic "Beam-beam with gear Change for JLEIC" | ||

+ | - Dan Abell "“Computational Considerations for Spin Tracking in Electron-Ion Colliders” | ||

+ | - David BruhWiler ""A New Approach to Calculating Magnetized Dynamical Friction for JLEIC" | ||

+ | Ran meeting on simulations for JLEIC, gave an update on BeamBeam simulations. Next meeting is 3/17/2017. | ||

+ | Working with B. Terzic to benchmark GHOST and BB3D together. | ||

+ | CEBAF: | ||

+ | - discussed 2R optics error investigation with Mike T. and Todd. | ||

+ | - met with Tim Maxwell (SLAC) regarding high level apps | ||

+ | - BEM for HALLD investigated. Added a segment using the tagger. | ||

---- | ---- | ||

'''Diagnostic Development - K. Jordan <br>''' | '''Diagnostic Development - K. Jordan <br>''' |

## Latest revision as of 10:04, 3 November 2017

**Director - M. Spata**

Previous two weeks (2/20 - 3/3)

Admin: Along with Division Leadership, met with new Director. Also had a 20 minute one-on-one meeting. Provided feedback at CASA monthly meeting. Admin: Submitted a two year Post Doc position to Fulvia to be paid with State Funds. Space charge and Collective effects modelling with planning for possible LERF beam tests is the general plan. Waiting on signatures from Human Resources, Budget and Compensation before posting. Admin: Prepared and presented monthly group meeting slides. Admin: Compiled present and potential WFO information to Division Leadership. Admin: Updated Annual Work Plans with budget office. DOE: Completed and submitted review report for LBNL 88" Cyclotron Review. CEBAF: Presented summary of 750 MHz Commissioning effort at Wednesday scheduling meeting. CEBAF: Attended morning meetings and B-Team meetings. CEBAF: Attended Parity Quality Beam Team meeting. They are developing summer beam plans. Need to integrate any CASA beam tests ASAP. JLEIC: Attended R&D, Planning, Simulations and Bunched Beam Cooling meetings. Reviewed two-year Kondratenko plan. WFO: Attended debrief of PERLE meeting with David, Alex and Fulvia. Should lobby for a seminar when it makes sense.

Next two weeks (3/4 - 3/17)

CEBAF: Completing Stay treat report. CEBAF: Taking over as optics-on-call. JLEIC: Helping organize next phase of BBC cooling experiments. Meeting with Division Leadership to iron out rules of engagement with Chinese collaborators based on recent China/US Collaboration deliberations at DOE.

**Accelerator Physics - T. Satogata **

Todd Satogata

Previous two weeks (Feb 20-Mar 3) - OPS: Hall D run setup/support; BTeam org, beam studies, Hall D coupling - JLEIC: Work/meetings on ion bunch formation strategy - JLEIC: Collective effects, spreadsheet planning and nagging; report at R&D meet - JLEIC: reading impedance papers, advise Randy on coasting beam instabilities - JLEIC: Resurrect gear changing centroid simulations, evol beam-beam simulations - ADMIN: Training, Eric Thompson research input - ADMIN: Start prepping for Elon documentary student visit Mar 20-22 Next two weeks (Mar 6-Mar 17) - OPS: Hall D run setup/support; BTeam org, beam studies, Hall C KPP setup - ODU: Review PhD theses for Kirsten Keitrick, Ahmad Sheikhzadah - JLEIC: Continue work/meetings on ion bunch formation strategy - JLEIC: Collective effects, spreadsheet planning and nagging; R&D meet - JLEIC: continue impedance theory work, start longitudinal simulations - JLEIC: Start 4/3 gear changing simulations for GHOST paper, evol beam-beam sims - IPAC18: Start organizing ideas for invited talk proposals (SPC task) - ADMIN: Eric Thompson meetings, research input - ADMIN: Start prepping for Elon documentary student visit Mar 20-22

Alex Bogacz

Previous two weeks (Feb 20-Mar 3) - OPS: Optics support/on call - PERLE: lattice re-design, Feb trip/presentation at Orsay - PERLE: Reporting on PERLE workshop Next two weeks (Mar 6-Mar 17) - PRAB article review - PERLE: Iterate mini-PERLE design with longer magnets (per CERN) - JLEIC: Booster input to Todd re injection/parameters - USPAS: Practical lattice design course development

David Douglas

Previous two weeks (Feb 20-Mar 3) - PERLE: Complete talk, trip prep, trip, trip recovery - ADMIN: Cheng-Ying rec letters - ADMIN: DOE panel review (7 SBIR-scale proposals!), prep for travel - SICK: Feb 27 Next two weeks (Mar 6-Mar 17) - ADMIN: DC travel Mar 5-6 for panel review - JLEIC: Write up of emittance exchange slides/tech note - JLEIC: Return to CCR arc requirements document, CCR architecture concepts document, and ERL/CCR beam exchange system requirements

Rui Li

Previous two weeks (Feb 20-Mar 3) - JLEIC: Understand logic and assumptions of ZAP, read code - JLEIC: Collect relevant impedance calculation parameters from Fanglei, Vasiliy, Shaoheng, and Tim - JLEIC COOL: Parsing requirements on collective effects and simulation studies for cooler mini-design report Next two weeks (Mar 6-Mar 17) - JLEIC: Continue estimation of single-bunch instability effects - JLEIC: Start estimation of coupled-bunch instability effects based on collected parameters - ADMIN: Continue reading, commenting on Cheng-Ying's dissertation - ADMIN: Prep for Mar 20-21 travel to Va Tech for Chang-Ying's defense

Ed Nissen

Previous two weeks (Feb 20-Mar 3) - JLEIC: Continue writing PRSTAB paper draft on beam-beam sims, iterate with Daniel Schulte at CERN - JLEIC: Continue optimizing gear changing script model for Guinea Pig, observe desktop limitation at four threads - JLEIC: getting into Booster design, reading papers on injection design and space-charge dominated injector simulations Next two weeks (Mar 6-Mar 17) - JLEIC: Booster, Finish literature search, reading FNAL Booster proton design report - JLEIC: Booster, start documenting parameters for calculations and future simulations - JLEIC: Setup and start injection stripping simulations

Chris Tennant

Previous two weeks (Feb 20-Mar 3) - JLEIC COOL: piece together various e-cooler "modules" (linac, arc, de-chirper, cooling channel, etc.) into a true S2E deck for elegant and TStep - JLEIC COOL: transverse match from each module to the next for different charge states - JLEIC COOL: run S2E for 0 pC, 420 pC and 2 nC - JLEIC COOL: begin to analyze/summarize data Next two weeks (Mar 6-Mar 17) - JLEIC COOL: complete data analysis - begin writing up aforementioned work (what began as a brief status of work on the cooler has morphed into a mini-Design Report).

Randy Gamage

Previous two weeks (Feb 20-Mar 3) - JLEIC: Continue BLonD simulations of debunch/rebunch with impedance - JLEIC: Longitudinal impedance reading Next two weeks (Mar 6-Mar 17) - JLEIC: Continue BLonD simulations of debunch/rebunch with impedance - JLEIC: Continue Longitudinal impedance reading, calculations - JLEIC: Continue writing outlines of initial dissertation chapters

**Accelerator R and D - Y. Zhang **

Slava Derbenev

*Studied EIC Community Review Report *Contributed to COOL17 Workshop Science Program *Conntinued JLEIC design study *Continued unified field theory study

Fanglei Lin

*Lead discussion of a few topics from the report of review of EIC accelerator R&D for the office nuclear physics. *Continued chromaticity compensation studies in electron collider ring and presented the progress in the bi-weekly non-linear beam dynamics meeting. *Provided electron ring information for the estimation of impedance budget. *Working on spin tracking in ZGOUBI. *Miscellaneous: attended the CASA monthly meeting, attended the beam-beam code development meetings, attended JLEIC weekly R&D meetings, attended the bi-weekly non-linear beam dynamics meeting, attended the bi-weekly ion polarization meeting, attended the bi-weekly simulation meeting, discussion of potential LDRD proposals.

Vasiliy Morozov

*Discussions of R&D prioritization committee report. *Non-linear dynamics: working on a journal paper on interaction region integration, teleconference with SLAC *Ion polarization: teleconference with Anatoliy's group, developing a plan for the next two years *Crab crossing: working with Salvador on simulations *Geometry tagging LDRD: teleconference with collaborators, preparing LoI for the second year extension *Interaction region: detector background simulations *Miscellaneous: seminar committee, muon cooling, GHOST, Slava's thesis, electron-positron collider for dark matter search

Amy Sy

*Skew PIC: Modified genetic algorithm on ifarm to generate Gaussian-distributed individuals instead of uniformly-distributed individuals for optimization of large variable sets. Considered Chebyshev expansion of magnetic fields and optimizing nonlinear optics in Skew PIC channel in terms of Chebyshev polynomial coefficients instead of standard Taylor series approach. "Chebyshev-like" approach forces simultaneous optimization of sextupole and octupole components, which reduces the beam size by ~25% for the same initial distribution. *Merger: Implementing a transition section between straight and toroid sections to best avoid emittance growth. Still working on verifying magnetized distribution properties from distribution created using a flat beam transform and propagating through a solenoid.

Guohui Wei

*Simulated ePb collision in JLEIC IR section. Preliminary analysis of the correlation between color charge propagation and impact parameter (b), the path length traveled in the medium following the first collision. *Continuing on dynamic aperture study with tune scan for the JLEIC ion collider ring. *Prepare for the proceeding paper in IPAC'17

Yuhong Zhang

*Studied EIC Community Review Report, and organized two discussion sessions *Continued to work with other collaborators to prepare the 2nd cooling experiment at IMP *Initiated a discussion of a new JLab LDRD for bunched beam cooling *Started re-examination of several JLab design issues discussed in the EIC review report *Continued preparation of JLEIC Spring Collaboration Meeting, worked on confirmation of speakers *Started preparation of IPAC17 contributed talk, posters and papers *Miscellaneous: many meetings, etc.

**Computational Physics - Y. Roblin **

He Zhang

- Cooling simulation - Found and fixed one bug when implementing tracking in the cooling simulation. Performed some simulations with various parameter sets. In these simulations, the transverse rms bunch size of the ion beam changes from 33% to 100% of the electron beam radius, and the longitudinal rms length of the ion beam changes in the same manor to the electron bunch length. Made plots of the dynamic invariants of the ions w.r.t. their initial positions or initial dynamic invariants. I did observe different patterns for different ion bunch sized, compared with the electron bunch size. However, now I can’t explain the results and draw a solid conclusion. In these simulations, the ions with similar initial position have different dynamic invariants and different momentum. The ions with similar dynamic invariants have different position and momentum. Averaging of the inhomogeneous parameters makes it more difficult to understand the results. I’m planning to make more simulations with more specific parameter values, which may help to more deeply investigate the problem. - Dust particle transport - Read more about the longitudinal motion of the dust particles. Now I understand there are two mechanisms for the dust particles to gain longitudinal momentum. One is due to the change of the electron bunch profile. The other is the Moller scattering of the beam electrons with the atomic electrons inside the dust. The latter one dominates when the mass-to-charge ratio is very large. Finished the slides to summary the dust particle transport theory and formulas. Had a discussion with Rongli about the value range of the parameters. Rongli provides his estimates on some parameters and also provides some documents. I haven’t got time to do any calculations. Rongli also points that the dust particle may moves in the opposite direction of the beam motion, according to their observation. - Cooling theory study - Read Chapter 1.1 (till page 20) of Slava’s thesis and made slides on the contents. Had a two-hour meeting to present and discuss the slides with Slava and Yuhong. - Trip rate/heat load optimization - Generates new plots to compare the gradients of the multi-object optimized setting with those of the trip rate optimized setting used in operation. In the new plots, both groups of gradients are normalized by the maximum gradient in the group. - LDRD for FY2018 - Proposed to write a proposal for LDRD fund for FY2018. The purpose is to extend the capability of GHOST for the simulation of non-Gaussian beam collisions, for which the FMM will be used to calculate the Coulomb interaction of non-Gaussian beams. The proposed work includes: 1. Investigate parallel FMM framework: pkifmm and exafmm; 2. Select one of them and make sure it runs with good parallel efficiency in CPU-GPU hybrid cluster; 3. Insert our FMM kernel into the selected parallel FMM framework; 4. Implement FMM in GHOST; 5. Run a few benchmark cases for beam-beam with Gaussian or non-Gaussian beams. I am writing the LOI. - Submit a proposal for SULI summer student program. - Got the following notice: “The offer extended to Zachary Abrams Dunlap-Tunnage was accepted on 2/17/2017 11:34:39 PM. The offer was to work with He Zhang on Space charge field calculation with a boundary of arbitrary geometry.”

Yves Roblin

Organized the simulation parallel session for the upcoming collaboration meeting. All speakers are now confirmed: - Ji Qiang TBD (Beam beam 3D simulations with FFB and crabbing but he has not send me the title yet) - Jean Luc Vay "Berkeley Lab modeling tools for electron cloud build-up and effects on beam transport" - Balsa Terzic "Beam-beam with gear Change for JLEIC" - Dan Abell "“Computational Considerations for Spin Tracking in Electron-Ion Colliders” - David BruhWiler ""A New Approach to Calculating Magnetized Dynamical Friction for JLEIC" Ran meeting on simulations for JLEIC, gave an update on BeamBeam simulations. Next meeting is 3/17/2017. Working with B. Terzic to benchmark GHOST and BB3D together. CEBAF: - discussed 2R optics error investigation with Mike T. and Todd. - met with Tim Maxwell (SLAC) regarding high level apps - BEM for HALLD investigated. Added a segment using the tagger.

**Diagnostic Development - K. Jordan **