Author: Arlandoo, M.
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MOPAB126 BESSY III & MLS II - Status of the Development of the New Photon Science Facility in Berlin 451
 
  • P. Goslawski, M. Abo-Bakr, F. Andreas, M. Arlandoo, J. Bengtsson, V. Dürr, K. Holldack, J.-G. Hwang, A. Jankowiak, B.C. Kuske, J. Li, A.N. Matveenko, T. Mertens, A. Meseck, E.C.M. Rial, M. Ries, M.K. Sauerborn, A. Schälicke, M. Scheer, P. Schnizer, L. Shi, J. Viefhaus
    HZB, Berlin, Germany
  • J. Lüning
    UPMC, Paris, France
  
  HZB op­er­ates and de­vel­ops two syn­chro­tron ra­di­a­tion sources at Berlin Adler­shof. The larger one, BESSY II with an en­ergy of 1.7 GeV and 240 m cir­cum­fer­ence is op­ti­mized for soft-X rays and in op­er­a­tion since 1999. The smaller one is the MLS (Metrol­ogy Light Source), owned by the Physikalis­che Tech­nis­che Bun­de­sanstalt (PTB) - Ger­many’s Na­tional Metrol­ogy In­sti­tute. It is de­signed to ful­fill the spe­cial metrol­ogy needs of the PTB with an en­ergy of 0.6 GeV and 48 m cir­cum­fer­ence, cov­er­ing the spec­tral range from THz and IR to EUV/VUV. In 2020 a dis­cus­sion process has been started to de­fine the re­quire­ments for suc­ces­sors of BESSY II and MLS and to study the pos­si­bil­i­ties in­te­grate them into a new pho­ton sci­ence fa­cil­ity in Berlin Adler­shof. Here, we give a sta­tus re­port and pre­sent a first en­vis­aged pa­ra­me­ter space to both ma­chines (see also MOPAB262, MOPAB220, MOPAB048, MOPAB242).  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB126  
About • paper received ※ 18 May 2021       paper accepted ※ 24 June 2021       issue date ※ 18 August 2021  
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MOPAB262 First Thoughts on Lattices for a possible Metrology Light Source 2 833
 
  • M. Arlandoo, M. Abo-Bakr, P. Goslawski, J. Li
    HZB, Berlin, Germany
  
  The Physikalisch-Tech­nis­che Bun­de­sanstalt (PTB), in co­op­er­a­tion with the Helmholtz-Zen­trum Berlin (HZB), op­er­ates the Metrol­ogy Light Source (MLS), which is a low-en­ergy elec­tron stor­age ring. The MLS can be op­er­ated in a low-al­pha mode to pro­duce co­her­ent syn­chro­ton ra­tion in the far-IR and THz spec­tral range. In the scope of the Con­cep­tual De­sign process for a BESSY II suc­ces­sor, the PTB also re­quested for an MLS suc­ces­sor to cover their in­creas­ing de­mands on syn­chro­tron ra­di­a­tion. A com­bi­na­tion of two dif­fer­ent ma­chines, one op­ti­mized for low emit­tance (BESSY III) and one for flex­i­ble tim­ing ca­pa­bil­i­ties (MLS II), would pro­vide best ra­di­a­tion ca­pa­bil­i­ties for our user com­mu­nity. In this paper, we dis­cuss the de­mands on the MLS II and pro­pose first lat­tice can­di­dates which may meet the needs of the PTB and HZB. Cur­rently, we focus on lin­ear lat­tices for stan­dard user mode with first steps to­wards non­lin­ear op­ti­miza­tion.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB262  
About • paper received ※ 18 May 2021       paper accepted ※ 02 June 2021       issue date ※ 17 August 2021  
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TUPAB213 Important Drift Space Contributions to Non-Linear Beam Dynamics 1914
 
  • J. Frank, M. Arlandoo, P. Goslawski, J. Li, T. Mertens, M. Ries
    HZB, Berlin, Germany
  
  This paper pre­sents an in-depth analy­sis of the non-lin­ear con­tri­bu­tions of drift spaces in beam dy­nam­ics for the cre­ation of Trans­verse Res­o­nance Is­land Buck­ets (TRIBs). TRIBs have been suc­cess­fully gen­er­ated in BESSY II and MLS at the Helmholtz-Zen­trum Berlin für Ma­te­ri­alien und En­ergie GmbH (HZB). They offer the pos­si­bil­ity of gen­er­at­ing a sec­ond sta­ble orbit and, by pop­u­lat­ing the orbit with a dif­fer­ent elec­tron bunch pat­tern, allow to ef­fec­tively have two dis­tinct ra­di­a­tion sources in the same ma­chine in­di­vid­u­ally tai­lored to dif­fer­ent user needs. We demon­strate the gen­er­a­tion of TRIBs by order of non-lin­ear­ity on sim­ple lat­tice con­fig­u­ra­tions by only treat­ing the drift space as the non-lin­ear el­e­ment. More­over, we also in­sert other non-lin­ear mag­nets to show how they mod­ify the al­ready gen­er­ated TRIBs from the drift spaces. We con­clude by giv­ing a qual­i­ta­tive analy­sis of the oc­cur­ring ef­fects, which pro­vides a guide­line as to when the lin­ear ap­prox­i­ma­tion is in­suf­fi­cient and the non-lin­ear con­tri­bu­tion has to be taken into ac­count.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB213  
About • paper received ※ 12 May 2021       paper accepted ※ 31 August 2021       issue date ※ 29 August 2021  
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TUPAB214 Alpha Buckets in Longitudinal Phase Space: A Bifurcation Analysis 1917
 
  • J. Frank, M. Arlandoo, P. Goslawski, T. Mertens, M. Ries
    HZB, Berlin, Germany
  
  At HZB’s BESSY II and MLS fa­cil­i­ties we have the abil­ity to tune the mo­men­tum com­paction fac­tor α up to sec­ond non-lin­ear order. The non-lin­ear de­pen­dence α(δ) brings qual­i­ta­tive changes to the lon­gi­tu­di­nal phase space and in­tro­duces new fix points α(δ)=0 which pro­duce the so-called α-buck­ets. We pre­sent with this paper an analy­sis of this phe­nom­ena from the stand­point of bi­fur­ca­tion the­ory. With this ap­proach we were able to char­ac­ter­ize the na­ture of the fix points and their po­si­tion in di­rect de­pen­dence on the tun­able pa­ra­me­ters. Fur­ther­more, we are able to place strin­gent con­di­tions onto the tun­able pa­ra­me­ters to ei­ther cre­ate or de­stroy α-buck­ets.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB214  
About • paper received ※ 12 May 2021       paper accepted ※ 17 June 2021       issue date ※ 26 August 2021  
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TUPAB215 Novel Non-Linear Particle Tracking Approach Employing Lie Algebraic Theory in the TensorFlow Environment 1920
 
  • J. Frank, M. Arlandoo, P. Goslawski, J. Li, T. Mertens, M. Ries, L. Vera Ramirez
    HZB, Berlin, Germany
  
  With this paper we pre­sent first re­sults for en­cod­ing Lie trans­for­ma­tions as com­pu­ta­tional graphs in Ten­sor­flow that are used as lay­ers in a neural net­work. By im­ple­ment­ing a re­cur­sive dif­fer­en­ti­a­tion scheme and em­ploy­ing Lie al­ge­braic ar­gu­ments we were able to re­pro­duce the di­a­grams for well known lat­tice con­fig­u­ra­tions. We track through sim­ple op­ti­cal lat­tices that are en­coun­tered as the main con­stituents of ac­cel­er­a­tors and demon­strate the flex­i­bil­ity and mod­u­lar­ity our ap­proach of­fers. The neural net­work can rep­re­sent the op­ti­cal lat­tice with pre­de­fined co­ef­fi­cients al­low­ing for par­ti­cle track­ing for beam dy­nam­ics or can learn from ex­per­i­men­tal data to fine-tune beam op­tics.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB215  
About • paper received ※ 12 May 2021       paper accepted ※ 31 August 2021       issue date ※ 21 August 2021  
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