TU1B —  Working Group B: Storage Ring Light Sources   (29-Aug-23   08:30—10:30)
Chair: A. Jankowiak, HZB, Berlin, Germany
Paper Title Page
TU1B1 A Highly Competitive Non-Standard Lattice for a 4th Generation Light Source With Metrology and Timing Capabilities 58
 
  • P. Goslawski, M. Abo-Bakr, J. Bengtsson, K. Holldack, Z. Hüsges, A. Jankowiak, K. Kiefer, B.C. Kuske, A. Meseck, R. Müller, M.K. Sauerborn, O. Schwarzkopf, J. Viefhaus, J. Völker
    HZB, Berlin, Germany
  
  The PTB, Ger­many’s na­tional in­sti­tute for stan­dards and metrol­ogy, has re­lied on syn­chro­tron ra­di­a­tion for metrol­ogy pur­poses for over 40 years and the most promi­nent cus­tomers are lith­o­g­ra­phy sys­tems from ASML/ZEIS. HZB is now work­ing on a con­cept for a BESSY II suc­ces­sor, based on a 4th gen­er­a­tion light source with an emit­tance of 100 pmrad @ 2.5 GeV. It is es­sen­tial, that this new fa­cil­ity con­tin­ues to serve the PTB for metrol­ogy pur­poses. This sets clear bound­ary con­di­tions for the lat­tice de­sign, in par­tic­u­lar, the need for ho­mo­ge­neous bends as metro­log­i­cal ra­di­a­tion sources. Dif­fer­ent Higher-Or­der-Multi-Bend-Achro­mat lat­tices have been de­vel­oped, based on com­bined func­tion gra­di­ent bends and ho­mo­ge­neous bends in a sys­tem­atic lat­tice de­sign ap­proach. All lat­tices are lin­early equiv­a­lent with the same emit­tance and max­i­mum field strength. How­ever, they dif­fer sig­nif­i­cantly in their non-lin­ear be­hav­ior. Based on this analy­sis, the choice of the BESSY III lat­tice type is mo­ti­vated. A spe­cial focus is set also on TRIBs (Trans­verse Res­o­nance Is­land Buck­ets) to op­er­ate with two or­bits as a bunch sep­a­ra­tion scheme in MBAs, for dif­fer­ent rep­e­ti­tion rates or for the sep­a­ra­tion of short and long bunches.  
slides icon Slides TU1B1 [7.584 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU1B1  
About • Received ※ 23 August 2023 — Revised ※ 28 August 2023 — Accepted ※ 30 August 2023 — Issued ※ 02 December 2023
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TU1B2
 Low-alpha Storage Ring Design for Steady-State Microbunching to Generate EUV Radiation  
 
  • Z. Pan, A. Chao, X.J. Deng, W.-H. Huang, R.K. Li, Z.Z. Li, C.-X. Tang
    TUB, Beijing, People’s Republic of China
  
  A new con­cept is pro­posed for min­i­miz­ing the lon­gi­tu­di­nal emit­tance of a low mo­men­tum com­paction fac­tor (low-al­pha) stor­age ring which has the ca­pa­bil­ity to sta­bly store sub-fem­tosec­ond elec­tron bunches for the first time. This stor­age ring is de­signed for Steady-State mi­crobunch­ing (SSMB) to gen­er­ate kW level av­er­age power EUV ra­di­a­tion. The pro­posed de­sign ap­proach can be ap­plied to any quasi-isochro­nous stor­age rings to yield very high ra­di­a­tion power due to lon­gi­tu­di­nal co­her­ence of the ra­di­a­tion. We ob­tain an op­ti­mal lat­tice de­sign by min­i­miz­ing global and local mo­men­tum com­paction fac­tors si­mul­ta­ne­ously and the re­sult of sin­gle-par­ti­cle track­ing shows that the elec­tron beam with equi­lib­rium rms bunch length of about 40 nm can be stored in this ring. We also clar­ify in this type ring, the hor­i­zon­tal emit­tance will be fixed when beam en­ergy, di­pole bend­ing angle and cell tune is fixed. In this type ring, the cal­cu­la­tion for IBS ef­fect will be dif­fer­ent with tra­di­tional rings, we point out where the dif­fer­ence is and give a more con­ve­nient cal­cu­la­tion for it.  
slides icon Slides TU1B2 [1.628 MB]  
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TU1B3 Nonlinear Optics From Hybrid Dispersive Orbits 62
 
  • Y. Li, R.S. Rainer, V.V. Smaluk, D. Xu
    BNL, Upton, New York, USA
  
  Funding: Supported by US DoE under Contract No. DE-SC0012704
In this paper we pre­sent an ex­pan­sion of the tech­nique of char­ac­ter­iz­ing non­lin­ear op­tics from off-en­ergy or­bits (NOECO) to cover har­monic sex­tupoles in stor­age rings. The ex­ist­ing NOECO tech­nique has been suc­cess­fully used to cor­rect the chro­matic sex­tu­pole er­rors on the MAX-IV ma­chine, how­ever, it did not ac­count for har­monic sex­tupoles, which are widely used on many other ma­chines. Through gen­er­at­ing ver­ti­cal dis­per­sion with chro­matic skew quadrupoles, a mea­sur­able de­pen­dence of non­lin­ear op­tics on har­monic sex­tupoles can be ob­served from hy­brid hor­i­zon­tal and ver­ti­cal dis­per­sive or­bits. Proof of con­cept of our ex­panded tech­nique was ac­com­plished by sim­u­la­tions and beam mea­sure­ments on the Na­tional Syn­chro­tron Light Source II (NSLS-II) stor­age ring. 		 
slides icon Slides TU1B3 [1.428 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU1B3  
About • Received ※ 18 August 2023 — Revised ※ 20 August 2023 — Accepted ※ 31 August 2023 — Issued ※ 02 December 2023
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TU1B4 Minimizing the Fluctuation of Resonance Driving Terms for Analyzing and Optimizing the Storage Ring Dynamic Aperture 66
 
  • Z.H. Bai, B.F. Wei
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  • A. Loulergue, L.S. Nadolski, R. Nagaoka
    SOLEIL, Gif-sur-Yvette, France
  
  Min­i­miza­tion of res­o­nance dri­ving terms (RDTs) of non­lin­ear mag­nets such as sex­tupoles and oc­tupoles is an es­sen­tial con­di­tion for en­larg­ing the dy­namic aper­ture (DA) of a stor­age ring. We re­cently stud­ied the cor­re­la­tion be­tween min­i­miz­ing the fluc­tu­a­tion or vari­a­tion of RDTs along the ring and en­larg­ing the DA. It was found that min­i­miz­ing the RDT fluc­tu­a­tions is much more ef­fec­tive than min­i­miz­ing the com­monly-used one-turn RDTs in en­larg­ing the DA, and that re­duc­ing low-or­der RDT fluc­tu­a­tions can also help re­duce both higher-or­der RDT fluc­tu­a­tions and higher-or­der one-turn RDTs. In this paper, DA analy­sis based on min­i­miz­ing RDT fluc­tu­a­tions is fur­ther ex­tended. By con­sid­er­ing the RDT fluc­tu­a­tions in­clud­ing low- and high-fre­quency fluc­tu­a­tions, some non­lin­ear dy­nam­ics is­sues can be ex­plained. DA op­ti­miza­tion is also stud­ied based on nu­mer­i­cally min­i­miz­ing RDT fluc­tu­a­tions using ge­netic al­go­rithms. Large DA can be ob­tained, and the op­ti­miza­tion is per­formed very fast.  
slides icon Slides TU1B4 [3.118 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-FLS2023-TU1B4  
About • Received ※ 23 August 2023 — Revised ※ 28 August 2023 — Accepted ※ 30 August 2023 — Issued ※ 02 December 2023
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