TU3B —  Working Group B: Storage Ring Light Sources   (29-Aug-23   14:00—16:00)
Chair: M. Aiba, PSI, Villigen PSI, Switzerland
Paper Title Page
TU3B1
 Machine Learning Applications for Performance Improvement and Developing Future Storage Ring Light Sources  
 
  • S.C. Leemann
    LBNL, Berkeley, USA
  
  Funding: This research is funded by the US Department of Energy (BES & ASCR Programs), and supported by the Director of the Office of Science of the US Department of Energy under Contract No. DEAC02-05CH11231.
This pre­sen­ta­tion will focus on two re­cent ap­pli­ca­tions of Ma­chine Learn­ing (ML) to stor­age ring-based syn­chro­tron light sources. The first ex­am­ple high­lights im­prove­ment of stor­age ring per­for­mance by use of ML to sta­bi­lize the elec­tron beam size at the source points against per­tur­ba­tions from in­ser­tion de­vice (ID) mo­tion*. The sta­bil­ity of the source size is im­proved by roughly one order of mag­ni­tude through a neural net­work-based feed-for­ward that com­pen­sates, in a model-in­de­pen­dent man­ner, for ID-in­duced source size changes be­fore they can occur. In the sec­ond ex­am­ple, ML is used to re­place many-turn par­ti­cle track­ing in multi-ob­jec­tive ge­netic al­go­rithms (MOGA) for the de­sign of lat­tices for de­mand­ing fu­ture stor­age rings**. By train­ing neural net­works to give ac­cu­rate pre­dic­tions of non­lin­ear lat­tice prop­er­ties such as dy­namic aper­ture and mo­men­tum aper­ture, the over­all MOGA op­ti­miza­tion process an be sub­stan­tially ac­cel­er­ated. In­clud­ing over­head from train­ing and it­er­a­tive re­train­ing, MOGA op­ti­miza­tion can be ac­cel­er­ated through ML by up to two or­ders of mag­ni­tude, thereby drop­ping over­all op­ti­miza­tion cam­paign run­time even on large clus­ters from weeks to just hours.
* Phys. Rev. Lett. 123, 194801 (2019), https://doi.org/10.1103/PhysRevLett.123.194801
** Nucl. Instrum. Methods Phys. Res., A 1050, 168192 (2023), https://doi.org/10.1016/j.nima.2023.168192
 		 
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TU3B2
 Recent Developments of the Toolkit for Simulated Commissioning  
 
  • T. Hellert
    LBNL, Berkeley, California, USA
  
  De­tailed com­mis­sion­ing sim­u­la­tions have be­come the main tool of error analy­sis dur­ing lat­tice de­sign of 4th gen­er­a­tion stor­age ring light sources in re­cent years. The Mat­lab based Toolkit for Sim­u­lated Com­mis­sion­ing pro­vides a high fi­delity error model and a user friendly in­ter­face and is cur­rently used at sev­eral fa­cil­i­ties around the world. This con­tri­bu­tion will pre­sent the toolkit with the high­light on re­cent de­vel­op­ments such as the in­te­gra­tion into the ALS con­trol sys­tem for au­to­mated startup pro­ce­dures and the tran­scrip­tion into python, en­abling large scale par­al­leliza­tion.  
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TU3B3 Pyapas: A New Framework for High Level Application Development at HEPS 77
 
  • X.H. Lu
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • D. Ji, H.F. Ji, Y. Jiao, J.Y. Li, N. Li, C. Meng, Y.M. Peng, J. Wan, Y. Wei, G. Xu, H.S. Xu, Y.L. Zhao
    IHEP, Beijing, People’s Republic of China
  
  The de­vel­op­ment of high-level ap­pli­ca­tion (HLA) is an in­dis­pens­able part of the light source con­struc­tion process. With the in­crease in the scale and com­plex­ity of ac­cel­er­a­tors, the de­vel­op­ment of HLA will also face many new chal­lenges, such as in­creased data vol­ume, mul­ti­ple data types, more pa­ra­me­ter chan­nels, and more com­plex tun­ing al­go­rithms. So a new frame­work named Pya­pas has been de­signed for HLA de­vel­op­ment which aims to pro­vide a high-per­for­mance, scal­able, flex­i­ble, and re­li­able HLA de­vel­op­ment frame­work to meet the needs of large-scale pa­ra­me­ter tun­ing and data pro­cess­ing. Pya­pas is de­signed with a mod­u­lar con­cept, de­com­pos­ing the de­vel­op­ment needs of HLA into dif­fer­ent mod­ules for de­cou­pled de­vel­op­ment, and call­ing them through sim­ple in­ter­faces. In the com­mu­ni­ca­tion mod­ule, a sin­gle­ton fac­tory class is de­signed to avoid du­pli­cate cre­ation of chan­nel con­nec­tions, and com­bined with Qt’s sig­nal-slot mech­a­nism to cre­ate non-block­ing com­mu­ni­ca­tion con­nec­tions, greatly im­prov­ing the car­ry­ing ca­pac­ity of pa­ra­me­ter scale. While a deeply de­cou­pled two-layer phys­i­cal model mod­ule is de­signed to quickly switch dif­fer­ent math­e­mat­i­cal mod­els to meet dif­fer­ent on­line com­put­ing needs. More­over, the de­sign of the C/S ar­chi­tec­ture de­vel­op­ment mod­ule and the rapid cre­ation and man­age­ment mod­ule of the data­base is help­ful for quickly de­vel­op­ing com­plex pro­grams, fur­ther en­hanc­ing the ap­plic­a­bil­ity of Pya­pas. This paper will in­tro­duce the main fea­ture of Pya­pas  
slides icon Slides TU3B3 [6.913 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU3B3  
About • Received ※ 30 August 2023 — Revised ※ 31 August 2023 — Accepted ※ 01 September 2023 — Issued ※ 02 December 2023
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TU3B4
 Use of Automated Commissioning Simulations for Error Tolerance Evaluation for the Advanced Photon Source Upgrade  
 
  • V. Sajaev, M. Borland
    ANL, Lemont, Illinois, USA
  
  Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
Multi-bend achro­mat-based light source de­signs are known to have rather strong fo­cus­ing and rather small vac­uum cham­bers, which pretty much guar­an­tees dif­fi­cult com­mis­sion­ing. To en­sure the Ad­vanced Pho­ton Source Up­grade* com­mis­sion­ing is pos­si­ble, the au­to­mated com­mis­sion­ing sim­u­la­tions were de­vel­oped**. The sim­u­la­tions start from tra­jec­tory cor­rec­tion in the trans­port line, go through first-turn cor­rec­tion, tra­jec­tory and orbit cor­rec­tion, and com­plete with lat­tice and cou­pling cor­rec­tion. In ad­di­tion to en­sur­ing smooth com­mis­sion­ing, these sim­u­la­tions proved very use­ful in eval­u­at­ing error tol­er­ances under the most re­al­is­tic con­di­tions. In some cases, this ap­proach al­lows for sig­nif­i­cant re­lax­ation of the tol­er­ances. We will de­scribe APS-U au­to­mated com­mis­sion­ing sim­u­la­tions and give ex­am­ples of error tol­er­ance eval­u­a­tions.
*M. Borland et al., "The Upgrade of the Advanced Photon Source", in Proc. IPAC’18, Vancouver, Canada, Apr.-May 2018, pp. 2872-2877
**V.Sajaev, "Commissioning simulations for the aps upgrade lattice," Phys. Rev. Accel. Beams, vol. 22, p. 040102, 2019 		 
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