Keyword: wiggler
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MOPIK054 Towards the Low Emittance CANDLE Storage Ring emittance, lattice, storage-ring, synchrotron 641
 
  • A. Sargsyan, G.A. Amatuni, V. Sahakyan, V.M. Tsakanov, G.S. Zanyan
    CANDLE SRI, Yerevan, Armenia
  
  Stim­u­lated by the re­cent ap­proaches and de­vel­op­ments in low emit­tance lat­tice de­sign and mag­net tech­nol­ogy a con­tin­u­ous process of CAN­DLE stor­age ring lat­tice im­prove­ment has been launched aim­ing to keep the pro­ject com­pet­i­tive in the field. The main goal of the up­grade pro­gram is to bring the beam emit­tances down to sub-nm level, hav­ing the con­di­tion of cost and per­for­mance ef­fi­ciency. This paper sum­ma­rizes the re­sults ob­tained in the above-men­tioned di­rec­tion. The main de­sign char­ac­ter­is­tics and lin­ear/non­lin­ear beam dy­nam­ics as­pects of the ob­tained new lat­tices are pre­sented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK054  
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MOPIK062 Optics Adaptations for Bending Magnet Beam Lines at ESRF: Short Bend, 2-Pole Wiggler, 3-Pole Wiggler lattice, radiation, dipole, alignment 666
 
  • S.M. Liuzzo, N. Carmignani, J. Chavanne, L. Farvacque, B. Nash, P. Raimondi
    ESRF, Grenoble, France
  
  The ESRF-EBS pro­ject fore­sees the re­place­ment of the ex­ist­ing bend­ing mag­nets beam­lines with dif­fer­ent ra­di­a­tion sources: short bend, 2-pole wig­gler or 3-pole wig­gler. After de­scrib­ing the rea­sons for this choices the re­quired mod­i­fi­ca­tions to the stor­age ring lat­tice are de­scribed in de­tails for each case. The study of the im­pact of lat­tice er­rors is also ad­dressed, lead­ing to the de­f­i­n­i­tion of beam­lines' align­ment tol­er­ances.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK062  
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TUPAB115 Impact of Electron Beam Heating on Insertion Devices at Diamond Light Source electron, cryogenics, insertion-device, insertion 1588
 
  • E.C.M. Rial, Z. Patel
    DLS, Oxfordshire, United Kingdom
  
  Elec­tron beam heat­ing is a widely ob­served phe­nom­e­non at syn­chro­tron fa­cil­i­ties around the world, and has a large im­pact par­tic­u­larly on cryo­genic in­ser­tion de­vices, but also on room tem­per­a­ture de­vices. This paper seeks to out­line elec­tron beam heat­ing mea­sure­ments taken at Di­a­mond Light Source (DLS) and pro­duces an em­pir­i­cal heat load re­la­tion­ship that matches the form of heat­ing through the anom­alous skin ef­fect, al­though gives an order of mag­ni­tude higher than that pre­dicted by the­ory. Re­sis­tive wall heat­ing should vary in­versely with the gap of in­stalled cryo­genic and per­ma­nent mag­net in­ser­tion de­vices. This is also ex­am­ined in this paper and the re­sults pre­sented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB115  
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TUPAB116 Insertion Devices at Diamond Light Source: A Retrospective Plus Future Developments storage-ring, undulator, insertion-device, insertion 1592
 
  • Z. Patel, A. George, S. Milward, E.C.M. Rial, A.J. Rose, R.P. Walker, J.H. Williams
    DLS, Oxfordshire, United Kingdom
  
  2017 marks the tenth year of Di­a­mond op­er­a­tion, dur­ing which time all in­ser­tion de­vice straights have been filled. Di­a­mond Light Source is a third gen­er­a­tion, 3 GeV fa­cil­ity that boasts 29 in­stalled in­ser­tion de­vices. Most room tem­per­a­ture de­vices have been de­signed, man­u­fac­tured and mea­sured in-house, and progress has been made in struc­ture de­sign and con­trol sys­tems to en­sure new de­vices con­tinue to meet strin­gent re­quire­ments placed upon them. The ‘com­ple­tion' of the stor­age ring is not, how­ever, the end of ac­tiv­ity for the ID group at Di­a­mond, as beam­lines map out po­ten­tial up­grade paths to Cryo­genic Per­ma­nent Mag­net Un­du­la­tors (CPMUs) and Su­per­Con­duct­ing Un­du­la­tors (SCUs). This paper traces the progress of ID de­sign at Di­a­mond, and maps out fu­ture pro­jects such as the up­grade to CPMUs and the chal­lenges of de­sign­ing a fixed-gap mini-wig­gler to re­place a sex­tu­pole in the main stor­age ring lat­tice.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPAB116  
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WEPAB011 High Order Magnetic Field Components and Non-Linear Optics at the ANKA Storage Ring octupole, resonance, sextupole, betatron 2586
 
  • A.I. Papash, E. Blomley, J. Gethmann, E. Huttel, A.-S. Müller, M. Schuh
    KIT, Eggenstein-Leopoldshafen, Germany
  
  The Karl­sruhe In­sti­tute of tech­nol­ogy op­er­ates the 2.5 GeV elec­tron stor­age ring ANKA as an ac­cel­er­a­tor test fa­cil­ity and syn­chro­tron ra­di­a­tion source. A su­per­con­duct­ing wig­gler is in­stalled in a short straight sec­tion of the ring where ver­ti­cal beta-func­tion is large (13 m). The life time of the elec­tron beam was re­duced from 15 to 12 hours at a high field level of the wig­gler (2.5 T) even though the co­her­ent shift of ver­ti­cal tune was com­pen­sated lo­cally. Com­puter sim­u­la­tions show the non-lin­ear na­ture of the ef­fect. The ANKA stor­age ring op­er­ates with strong sex­tupoles at a pos­i­tive chro­matic­ity of +2/+6. Even resid­ual oc­tu­pole com­po­nents of the wig­gler field, set at the tol­er­ance limit of fab­ri­ca­tion con­di­tions, could re­duce the dy­namic aper­ture for off-mo­men­tum par­ti­cles pro­vid­ing the be­ta­tron tune is lo­cated in the vicin­ity of a weak oc­tu­pole res­o­nance and the chro­matic­ity is high. Also the ver­ti­cal be­ta­tron tune is close to the sex­tu­pole res­o­nance Qy=8/3. Large res­o­nance stop-band and prox­im­ity of sex­tu­pole res­o­nance af­fect the life time as well. Be­ta­tron tunes of ANKA have been shifted away of sus­pected high-or­der res­o­nances and beam life time was es­sen­tially im­proved.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB011  
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WEPAB072 Apple II Undulator and Front End Design for the New LOREA Beamline at ALBA polarization, undulator, vacuum, dipole 2747
 
  • J. Campmany, L.G.O. Garcia-Orta, J. Marcos, V. Massana
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
  
  ALBA syn­chro­tron has started the con­struc­tion of a new beam­line LOREA, for Low-En­ergy Ul­tra-High-Res­o­lu­tion An­gu­lar Pho­toe­mis­sion for Com­plex Ma­te­ri­als. It will op­er­ate in the range of 10 to 1500 eV and will use po­lar­ized light. In order to pro­duce the light to be used in this beam­line, sev­eral op­tions have been stud­ied, and fi­nally an Apple II de­sign has been cho­sen. The de­vice can op­er­ate as an un­du­la­tor at low en­er­gies and as a wig­gler at high en­er­gies, reach­ing a wide en­ergy range. The high de­mand­ing char­ac­ter­is­tics of the beam­line in terms of en­er­gies lead to a de­vice pro­vid­ing high power and wide beam in some work­ing modes. This sit­u­a­tion has been a chal­lenge for the Front End de­sign, es­pe­cially for the ver­ti­cally po­lar­ized mode, with some changes with re­spect to stan­dard ALBA front ends. In this paper we pre­sent the mag­netic de­sign and ex­pected per­for­mances of the de­vice, that cur­rently is being built by KYMA, as well as the Front End de­sign, that cur­rently is being built by RMP and TVP.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB072  
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WEPIK008 Problems in SuperKEKB Vacuum System During the Phase-1 Commissioning and Their Mitigation Measures vacuum, electron, photon, positron 2925
 
  • Y. Suetsugu, H. Hisamatsu, T. Ishibashi, K. Kanazawa, K. Shibata, M. Shirai, S. Terui
    KEK, Ibaraki, Japan
  
  The first (Phase-1) com­mis­sion­ing of the Su­perKEKB, an en­ergy-asym­met­ric elec­tron-positron col­lider in KEK, Japan, started in Feb­ru­ary and ended in June, 2016. The vac­uum sys­tem of the main ring worked well through the com­mis­sion­ing pe­riod as a whole, but ex­pe­ri­enced sev­eral prob­lems, such as the elec­tron cloud ef­fect (ECE) in the positron ring, the pres­sure bursts ac­com­pa­ny­ing beam losses due to dust par­ti­cles in the beam pipe, an air leak at a con­nec­tion flange due to the di­rect hit­ting of syn­chro­tron ra­di­a­tion (SR), and so on. To­wards the next (Phase-2) com­mis­sion­ing, coun­ter­mea­sures to these prob­lems are taken dur­ing the shut­down pe­riod. For ex­am­ple, per­ma­nent mag­nets gen­er­at­ing axial mag­netic fields are at­tached to beam pipes at drift spaces for the sup­pres­sion of the ECE. Knock­ers, which can ar­ti­fi­cially drop dust par­ti­cles at­tached to the top sur­face in beam pipes by con­tin­u­ous im­pacts, are pre­pared to the beam pipes at which the pres­sure bursts had been fre­quently ob­served. Bel­lows cham­bers with masks are in­stalled to pro­tect the leaked flange from SR. The prob­lems and their mit­i­ga­tion mea­sures will be sum­ma­rized in the pre­sen­ta­tion.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK008  
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WEPIK068 Non-Linear Beam Dynamics Studies of the CLIC Damping Wiggler Prototype operation, optics, storage-ring, damping 3087
 
  • J. Gethmann, A. Bernhard, E. Blomley, E. Huttel, A.-S. Müller, A.I. Papash, M. Schedler
    KIT, Karlsruhe, Germany
  • Y. Papaphilippou, P. Zisopoulos
    CERN, Geneva, Switzerland
  • K. Zolotarev
    BINP SB RAS, Novosibirsk, Russia
  
  Funding: Julian Gethmann acknowledges the support by the DFG-funded Doctoral School Karlsruhe School of Elementary and Astroparticle Physics: Science and Technology
First beam dy­nam­ics stud­ies of a damp­ing wig­gler pro­to­type for the CLIC damp­ing rings have been car­ried out at the KIT stor­age ring. Ef­fects of the 2.9 T su­per­con­duct­ing wig­gler on the elec­tron beam in the 2.5 GeV stan­dard op­er­a­tion mode have been mea­sured and com­pared with the­o­ret­i­cal pre­dic­tions. Higher order mul­ti­pole com­po­nents were in­ves­ti­gated using local orbit bump mea­sure­ments. Based on these find­ings the sim­u­la­tion mod­els for the stor­age ring optic have been ad­justed. The re­fined op­tics model has been ap­plied to the 1.3 GeV, low-op­er­a­tion case. This case will be used to ex­per­i­men­tally bench­mark beam dy­nam­ics sim­u­la­tions in­volv­ing strong wig­gler fields and dom­i­nant col­lec­tive ef­fects. We pre­sent these mea­sure­ments, com­par­isons and the find­ings of the sim­u­la­tions with the up­dated low-mode op­tics model. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK068  
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WEPVA057 High-Stability Magnet Power Supplies for SuperKEKB controls, feedback, power-supply, operation 3391
 
  • T. Oki, T. Adachi, S. Nakamura
    KEK, Ibaraki, Japan
  
  For the Su­perKEKB, over 2,000 of mag­net power sup­plies were re­cy­cled and around 300 of power sup­plies were newly fab­ri­cated. The newly fab­ri­cated power sup­plies in­clude high per­for­mance power sup­plies: the main bend­ing/wig­gler mag­net power sup­plies and the power sup­plies for fi­nal-fo­cus su­per­con­duct­ing mag­nets in­stalled around an in­ter­ac­tion point. High power tests were per­formed and the re­sults are re­ported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA057  
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WEPVA127 Design of a 3.5 T Superconducting Multipole Wiggler vacuum, radiation, photon, simulation 3564
 
  • J.C. Jan, C.-H. Chang, H.-H. Chen, S.D. Chen, T.Y. Chung, C.-S. Hwang, F.-Y. Lin, G.-H. Luo
    NSRRC, Hsinchu, Taiwan
  
  A 3.5 T su­per­con­duct­ing mul­ti­pole wig­gler (SMPW) has been de­signed through the col­lab­o­ra­tion of Na­tional Syn­chro­tron Ra­di­a­tion Re­search Cen­ter (NSRRC) and Syn­chro­tron Light Re­search In­sti­tute (SLRI). The SMPW will sup­port the hard X-ray source for the X-ray ab­sorp­tion spec­troscopy (XAS) beam­line in SLRI. The de­sign con­cept of the SMPW fol­lows from, and im­proves on, the op­er­at­ing ex­pe­ri­ence of the su­per­con­duct­ing mag­net in NSRRC. An im­prove­ment of the op­er­a­tion and com­pat­i­ble with the cool­ing ca­pac­ity of the cryo­genic sys­tem, is the de­sign goal. A quick and easy re­cov­ery of the mag­net from a quench event is also re­quired. The de­sign of the mag­net cir­cuit and the me­chan­i­cal of the SMPW are also dis­cussed herein.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA127  
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