Author: Mayes, C.E.
Paper Title Page
MOPAB098 LCLS Multi-Bunch Improvement Plan 365
 
  • A. Halavanau, S. Carbajo, F.-J. Decker, A.K. Krasnykh, A.A. Lutman, A. Marinelli, C.E. Mayes, D.C. Nguyen
    SLAC, Menlo Park, California, USA
 
  Cur­rent and fu­ture ex­per­i­ments at LCLS re­quire XFEL pulse trains of vari­able time sep­a­ra­tion. The cav­ity based XFEL (CBXFEL) pro­ject re­quires mul­ti­ple pulses sep­a­rated by 220 ns, the X-ray Laser Os­cil­la­tor (XLO) uses 15 ns spaced pulse trains and Mat­ter under Ex­treme Con­di­tions (MEC) ex­per­i­ments need a shortly spaced (less than 5 ns) pulse trains. In this pro­ceed­ing, we dis­cuss the LCLS multi-bunch im­prove­ment plan and re­port on its re­cently sta­tus and progress.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB098  
About • paper received ※ 19 May 2021       paper accepted ※ 27 July 2021       issue date ※ 20 August 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
MOPAB101 Hollow and Flat Electron Beam Generation at FACET-II 376
 
  • A. Halavanau, S.J. Gessner, C.E. Mayes
    SLAC, Menlo Park, California, USA
  • J.B. Rosenzweig
    UCLA, Los Angeles, California, USA
 
  In this pro­ceed­ing, we in­ves­ti­gate hol­low and flat elec­tron beam gen­er­a­tion at FACET-II fa­cil­ity. We focus on the case of a cir­cu­lar beam­let arrange­ment, also known as ’neck­lace’ beams. We study, via nu­mer­i­cal sim­u­la­tions, the re­sult­ing e-beam dy­nam­ics in the FACET-II pho­toin­jec­tor, beam prop­a­ga­tion through the high en­ergy sec­tion, as well as pos­si­ble ex­per­i­men­tal ap­pli­ca­tions of the ’neck­lace’ beams. Fi­nally, we eval­u­ate the fea­si­bil­ity of high charge flat beam gen­er­a­tion.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB101  
About • paper received ※ 23 May 2021       paper accepted ※ 27 July 2021       issue date ※ 23 August 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEPAB234 Simulating Two Dimensional Coherent Synchrotron Radiation in Python 3177
 
  • W. Lou, Y. Cai, C.E. Mayes, G.R. White
    SLAC, Menlo Park, California, USA
 
  Co­her­ent Syn­chro­tron Ra­di­a­tion (CSR) in bend­ing mag­nets poses an im­por­tant limit for elec­tron beams to reach high bright­ness in novel ac­cel­er­a­tors. While the lon­gi­tu­di­nal wake­field has been well stud­ied in one-di­men­sional CSR the­ory and im­ple­mented in var­i­ous sim­u­la­tion codes, trans­verse wake­fields have re­ceived less at­ten­tion. Fol­low­ing the re­cently de­vel­oped two-di­men­sional CSR the­ory, we de­vel­oped a Python code sim­u­lat­ing the steady-state two-di­men­sional CSR ef­fects. The com­puted CSR wakes have been bench­marked with the­ory and other sim­u­la­tion codes. To speed up com­pu­ta­tion speed, the code ap­plies vec­tor­iza­tion, par­al­lel pro­cess­ing, and Numba in Python.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB234  
About • paper received ※ 20 May 2021       paper accepted ※ 01 July 2021       issue date ※ 20 August 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
WEPAB308 Measurement-Based Surrogate Model of the SLAC LCLS-II Injector 3395
 
  • L. Gupta, Y.K. Kim
    University of Chicago, Chicago, Illinois, USA
  • A.L. Edelen, C.E. Mayes, A.A. Mishra, N.R. Neveu
    SLAC, Menlo Park, California, USA
 
  Funding: This project was funded by the DOE SCGSR Program.
There is sig­nif­i­cant ef­fort within par­ti­cle ac­cel­er­a­tor physics to use ma­chine learn­ing meth­ods to im­prove mod­el­ing of ac­cel­er­a­tor com­po­nents. Such mod­els can be made re­al­is­tic and rep­re­sen­ta­tive of ma­chine com­po­nents by train­ing them with mea­sured data. These mod­els could be used as vir­tual di­ag­nos­tics or for model-based con­trol when fast feed­back is needed for tun­ing to dif­fer­ent user set­tings. To pro­to­type such a model, we demon­strate how a ma­chine learn­ing based sur­ro­gate model of the SLAC LCLS-II pho­to­cath­ode in­jec­tor was de­vel­oped. To cre­ate ma­chine-based data, laser mea­sure­ments were taken at the LCLS using the vir­tual cath­ode cam­era. These mea­sure­ments were used to sam­ple par­ti­cles, re­sult­ing in re­al­is­tic elec­tron bunches, which were then prop­a­gated through the in­jec­tor via the Astra space charge sim­u­la­tion. By doing this, the model is not only able to pre­dict many bulk elec­tron beam pa­ra­me­ters and dis­tri­b­u­tions which are often hard to mea­sure or not usu­ally avail­able to mea­sure, but the pre­dic­tions are more re­al­is­tic rel­a­tive to tra­di­tion­ally sim­u­lated train­ing data. The meth­ods for train­ing such mod­els, as well as model ca­pa­bil­i­ties and fu­ture work are pre­sented here.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB308  
About • paper received ※ 26 May 2021       paper accepted ※ 27 July 2021       issue date ※ 24 August 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THPAB217 Lightsource Unified Modeling Environment (LUME), a Start-to-End Simulation Ecosystem 4212
 
  • C.E. Mayes, A.L. Edelen, P. Fuoss, J.R. Garrahan, A. Halavanau, F. Ji, J. Krzywiński, W. Lou, N.R. Neveu, H.H. Slepicka
    SLAC, Menlo Park, California, USA
  • J.C. E, C. Fortmann-Grote
    EuXFEL, Schenefeld, Germany
  • C.M. Gulliford, D. Sagan
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • L. Gupta
    University of Chicago, Chicago, Illinois, USA
  • A. Huebl, R. Lehé
    LBNL, Berkeley, California, USA
 
  SLAC is de­vel­op­ing the Light­source Uni­fied Mod­el­ing En­vi­ron­ment (LUME) for ef­fi­cient mod­el­ing of X-ray free elec­tron laser (XFEL) per­for­mance. This pro­ject takes a holis­tic ap­proach start­ing with the sim­u­la­tion of the elec­tron beams, to the pro­duc­tion of the pho­ton pulses, to their trans­port through the op­ti­cal com­po­nents of the beam­line, to their in­ter­ac­tion with the sam­ples and the sim­u­la­tion of the de­tec­tors, and fi­nally fol­lowed by the analy­sis of sim­u­lated data. LUME lever­ages ex­ist­ing, well-es­tab­lished sim­u­la­tion codes, and pro­vides stan­dard in­ter­faces to these codes via open-source Python pack­ages. Data are ex­changed in stan­dard for­mats based on openPMD and its ex­ten­sions. The plat­form is built with an open, well-doc­u­mented ar­chi­tec­ture so that sci­ence groups around the world can con­tribute spe­cific ex­per­i­men­tal de­signs and soft­ware mod­ules, ad­vanc­ing both their sci­en­tific in­ter­ests and a broader knowl­edge of the op­por­tu­ni­ties pro­vided by the ex­cep­tional ca­pa­bil­i­ties of X-ray FELs.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB217  
About • paper received ※ 20 May 2021       paper accepted ※ 20 July 2021       issue date ※ 19 August 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPAB036 The Accelerator Design Progress for EIC Strong Hadron Cooling 1424
 
  • E. Wang, S. Peggs, V. Ptitsyn, F.J. Willeke, W. Xu
    BNL, Upton, New York, USA
  • S.V. Benson
    JLab, Newport News, Virginia, USA
  • D. Douglas
    Douglas Consulting, York, Virginia, USA
  • C.M. Gulliford, G.H. Hoffstaetter
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • C.E. Mayes
    Xelera Research LLC, Ithaca, New York, USA
 
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy,
The Elec­tron-Ion Col­lider will achieve a lu­mi­nos­ity of 1034 cm-2 s−1 by in­cor­po­rat­ing strong hadron cool­ing to coun­ter­act hadron In­tra-Beam Scat­ter­ing, using a co­her­ent elec­tron cool­ing scheme. An ac­cel­er­a­tor will de­liver the beams with key pa­ra­me­ters, such as 1 nC bunch charge, and 1e-4 en­ergy spread. The paper pre­sents the de­sign and beam dy­nam­ics sim­u­la­tion re­sults. Meth­ods to min­i­mize beam noise, the chal­lenges of the ac­cel­er­a­tor de­sign, and the R&D top­ics being pur­sued are dis­cussed.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB036  
About • paper received ※ 16 May 2021       paper accepted ※ 11 June 2021       issue date ※ 01 September 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)