Author: Meseck, A.
Paper Title Page
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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TUPAB217 Effect of Undulators on Transverse Resonant Island Orbits 1927
 
  • E.C.M. Rial, J. Bahrdt, P. Goslawski, A. Meseck, M. Ries, M. Scheer
    HZB, Berlin, Germany
  
  For one week in Oc­to­ber 2020, BESSY II of­fered a Two Orbit mode to users for the first time*. In this Two Orbit mode, the ex­is­tence of trans­verse res­o­nant is­land buck­ets** are ex­ploited to store a sec­ond beam in the stor­age ring as an ’is­land orbit’, away from the pri­mary beam axis. This mode was of­fered with free range of mo­tion of the 12 out of vac­uum un­du­la­tors in­stalled at the BESSY II ring. Di­ag­nos­tics of the is­land orbit were lim­ited to a sin­gle cam­era mon­i­tor­ing bend­ing mag­net ra­di­a­tion from a sin­gle di­pole. A sig­nif­i­cant mo­tion of the is­land orbit was ob­served on this di­ag­nos­tic and cor­re­lated with un­du­la­tor mo­tion. This ob­ser­va­tion is re­ported, and sim­u­la­tions pre­sented to demon­strate how this mo­tion could arise. Cor­rec­tion schemes are sug­gested and dis­cussed.
*Two Orbit - a report on the first scheduled week of TRIBs user operation at BESSY II, M. Ries et al, these proceedings
**Proc. IPAC 2016, Busan, S Korea, paper THPMR017, p. 3427 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB217  
About • paper received ※ 19 May 2021       paper accepted ※ 21 June 2021       issue date ※ 22 August 2021  
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WEPAB133 First Numerical Wakefield Studies of New In-Vacuum Cryogenic and APPLE II Undulators for BESSY II 2925
 
  • M. Huck, J. Bahrdt, A. Meseck
    HZB, Berlin, Germany
  • A. Meseck
    KPH, Mainz, Germany
  
  While the new in-vac­uum cryo­genic un­du­la­tor is in its last com­mis­sion­ing stages, a world­wide new in-vac­uum APPLE II un­du­la­tor is being de­signed and con­structed for BESSY II stor­age ring. Be­sides the chal­leng­ing me­chan­i­cal de­sign of these small-gap and short-pe­riod un­du­la­tors, chal­lenges arise due to in­ter­ac­tion with the elec­tron beam. There­fore, de­tailed stud­ies of this in­ter­ac­tion is re­quired to min­i­mize the ad­verse ef­fects on beam dy­nam­ics and the de­vice it­self. For this pur­pose, the wake­field ef­fects have been com­puted nu­mer­i­cally for crit­i­cal parts of these de­vices i.e. the RF-shields, flex­i­ble ta­pers and taper sec­tions. A brief overview of sim­u­la­tion re­sults and dis­cus­sions are pre­sented in this paper.  
poster icon Poster WEPAB133 [0.795 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB133  
About • paper received ※ 19 May 2021       paper accepted ※ 23 July 2021       issue date ※ 23 August 2021  
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WEPAB134 Experimental Studies of the In-Vacuum-Cryogenic Undulator Effect on Beam Instabilities at BESSY II 2929
 
  • M. Huck, J. Bahrdt, A. Meseck, G. Rehm, M. Ries, A. Schälicke
    HZB, Berlin, Germany
  
  A new in-vac­uum cryo­genic per­ma­nent mag­net un­du­la­tor (CP­MU17) has been in­stalled in sum­mer 2018 in the BESSY II stor­age ring at HZB. Such a small gap in-vac­uum un­du­la­tor de­vice in­creases the im­ped­ance of the stor­age ring and can con­tribute to the in­sta­bil­i­ties that ad­versely af­fect the beam qual­ity and the de­vice it­self. To iden­tify and ex­plore the ef­fects of CP­MU17 on the in­sta­bil­i­ties at BESSY II, grow-damp and drive-damp ex­per­i­ments have been con­ducted using the in­stalled bunch-by-bunch feed­back sys­tem. In this paper, the first re­sults of the mode and gap analy­sis of these stud­ies with a brief overview of other im­ped­ance stud­ies will be pre­sented.  
poster icon Poster WEPAB134 [1.079 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB134  
About • paper received ※ 17 May 2021       paper accepted ※ 02 July 2021       issue date ※ 23 August 2021  
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THPAB057 Goubau-Line Set Up for Bench Testing Impedance of In-Vacuum Undulator Components 3883
 
  • P.I. Volz, S. Grimmer, M. Huck, A. Meseck
    HZB, Berlin, Germany
  • A. Meseck
    KPH, Mainz, Germany
  
  The world­wide first in-vac­uum el­lip­ti­cal un­du­la­tor, IVUE32, is being de­vel­oped at Helmholtz Zen­trum Berlin. The 2.5 m long de­vice with a pe­riod length of 3.2 cm and a min­i­mum gap of about 7 mm is to be in­stalled in the BESSY II stor­age ring. It will de­liver soft X-ra­di­a­tion to sev­eral beam­lines. The prox­im­ity of the un­du­la­tor struc­ture to the elec­tron beam makes the de­vice sus­cep­ti­ble to wake­field ef­fects which can in­flu­ence beam sta­bil­ity. A com­plete un­der­stand­ing of its im­ped­ance char­ac­ter­is­tics is re­quired prior to in­stal­la­tion and op­er­a­tion, as un­fore­seen heat­ing of com­po­nents could have cat­a­strophic con­se­quences. Since its com­plex struc­ture makes nu­mer­i­cal cal­cu­la­tions, such as CST sim­u­la­tions, at high fre­quency very re­source in­ten­sive, bench test­ing the de­vice may proof in­valu­able. A Goubau-line is a sin­gle wire trans­mis­sion line for high fre­quency sur­face waves with a trans­verse elec­tric field re­sem­bling that of a charged par­ti­cle beam out to a cer­tain ra­dial dis­tance. This can be used to mea­sure the im­ped­ance of vac­uum cham­ber com­po­nents. A con­cept op­ti­mized for bench test­ing IVUE32-com­po­nents will be dis­cussed and progress to­wards the test bench set up will be shown.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB057  
About • paper received ※ 19 May 2021       paper accepted ※ 23 July 2021       issue date ※ 21 August 2021  
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MOPAB217 A Storage Ring for MESA 719
 
  • C.P. Stoll, A. Meseck
    KPH, Mainz, Germany
  • B. Ledroit
    HIM, Mainz, Germany
  
  The Mainz En­ergy-re­cov­er­ing Su­per­con­duct­ing Ac­cel­er­a­tor (MESA) is an En­ergy Re­cov­ery Linac (ERL) fa­cil­ity under con­struc­tion at the Jo­hannes Guten­berg-Uni­ver­sity in Mainz. It pro­vides the op­por­tu­nity for pre­ci­sion physics ex­per­i­ments with a 1 mA c.w. elec­tron beam in its ini­tial phase. In this phase ex­per­i­ments with un­po­larised, high den­sity 1019 atoms cm2 gas jet tar­gets are fore­seen at the Mainz Gas In­ter­nal Tar­get Ex­per­i­ment (MAGIX). To allow ex­per­i­ments with thin po­larised gas tar­gets with suf­fi­ciently high in­ter­ac­tion rates in a later phase, the beam cur­rent has to be in­creased to up to 100 mA, which would pose sig­nif­i­cant chal­lenges to the ex­ist­ing ERL ma­chine. Thus, it is pro­posed here to use MESA in pulsed op­er­a­tion with a rep­e­ti­tion rate of sev­eral kHz to fill a stor­age ring, pro­vid­ing a quasi c.w. beam cur­rent to a thin gas tar­get. For this pur­pose, the ex­ist­ing op­tics need to be ex­tended and adapted, a suit­able in­jec­tion and ex­trac­tion scheme is nec­es­sary and beam tar­get in­ter­ac­tion must be in­ves­ti­gated. First con­sid­er­a­tions on these top­ics are pre­sented here.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB217  
About • paper received ※ 18 May 2021       paper accepted ※ 08 June 2021       issue date ※ 21 August 2021  
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WEPAB062 Investigation of the Thomson Scattering Influence on Electron Beam Parameters in an Energy-Recovering Linear Accelerator on the Example of MESA 2732
 
  • C.L. Lorey, K. Aulenbacher, A. Meseck
    KPH, Mainz, Germany
  
  Funding: funded by DFG through GRK2128 ACCELENCE
At the Jo­hannes Guten­berg Uni­ver­sity (JGU) in Mainz, the Mainz En­ergy-re­cov­er­ing Su­per­con­duct­ing Ac­cel­er­a­tor (MESA) is cur­rently under con­struc­tion. It is de­signed to de­liver elec­tron beams of up to 155 MeV. As it can be op­er­ated in an en­ergy-re­cov­ery (ER) mode thus al­low­ing for high rep­e­ti­tion rate, it is a promis­ing can­di­date for a high flux Thom­son scat­ter­ing based gamma source. This paper will pro­vide a sta­tus up­date on the study of the im­pact of Thom­son scat­ter­ing on elec­tron beam pa­ra­me­ters and the un­der­ly­ing me­chan­ics. Fur­ther, the im­ple­men­ta­tion into a sim­u­la­tion code will be dis­cussed. 		 
poster icon Poster WEPAB062 [1.307 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB062  
About • paper received ※ 19 May 2021       paper accepted ※ 12 July 2021       issue date ※ 02 September 2021  
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