Keyword: insertion
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MOPAB001 Status of the FCC-hh Collimation System collimation, simulation, proton, collider 64
 
  • J. Molson, A. Faus-Golfe
    LAL, Orsay, France
  • R. Bruce, M. Fiascaris, A.M. Krainer, S. Redaelli
    CERN, Geneva, Switzerland
  
  Funding: Funding from the European Union's Horizon 2020 research and innovation programme under grant No 654305.
The fu­ture cir­cu­lar hadron col­lider (FCC-hh) will have an un­prece­dented pro­ton beam en­ergy of 50 TeV, and total stored beam en­ergy of 8.4 GJ. We dis­cuss cur­rent de­vel­op­ments in the col­li­ma­tion sys­tem de­sign, and meth­ods with which the chal­lenges faced due to the high en­er­gies in­volved can be mit­i­gated. Fi­nally sim­u­la­tion re­sults of new col­li­ma­tion sys­tem de­signs are pre­sented. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB001  
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MOPAB003 Energy Deposition in the Betatron Collimation Insertion of the 100 TeV Future Circular Collider dipole, proton, betatron, simulation 68
 
  • M.I. Besana, C. Bahamonde Castro, A. Bertarelli, R. Bruce, F. Carra, F. Cerutti, A. Ferrari, M. Fiascaris, A. Lechner, A. Mereghetti, S. Redaelli, E. Skordis, V. Vlachoudis
    CERN, Geneva, Switzerland
  
  The FCC pro­ton beam is de­signed to carry a total en­ergy of about 8500 MJ, a fac­tor of 20 above the LHC. In this con­text, the col­li­ma­tion sys­tem has to deal with ex­tremely tight re­quire­ments to pre­vent quenches and ma­te­r­ial dam­age. A first lay­out of the be­ta­tron clean­ing in­ser­tion was con­ceived, adapt­ing the pre­sent LHC col­li­ma­tion sys­tem to the FCC lat­tice. A cru­cial in­gre­di­ent to as­sess its per­for­mance, in par­tic­u­lar to es­ti­mate the ro­bust­ness of the pro­tec­tion de­vices and the load on the down­stream el­e­ments, is rep­re­sented by the sim­u­la­tion of the par­ti­cle shower gen­er­ated at the col­li­ma­tors, al­low­ing de­tailed en­ergy de­po­si­tion es­ti­ma­tions. This paper pre­sents the first re­sults of the sim­u­la­tion chain start­ing from the pro­ton losses gen­er­ated with the Six­track-FLUKA cou­pling, as cur­rently done for the pre­sent LHC and for its up­grade. Ex­pec­ta­tions in terms of total power, peak power den­sity and in­te­grated dose on the dif­fer­ent ac­cel­er­a­tor com­po­nents are pre­sented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB003  
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MOPAB133 Optimisation of Electrical and Instrumentation Design for the Diamond Light Source DDBA Upgrade storage-ring, dipole, instrumentation, insertion-device 448
 
  • A. Thomson, C.A. Abraham, M.T. Heron, S.C. Lay, G. Rehm, A.J. Rose, H.S. Shiers
    DLS, Oxfordshire, United Kingdom
  
  In plan­ning the up­grade of one cell of the Di­a­mond Stor­age Ring, the DDBA up­grade, it was ev­i­dent that the elec­tri­cal in­stal­la­tion and com­mis­sion­ing would con­tribute a sig­nif­i­cant com­po­nent of the over­all in­stal­la­tion time. Given the pres­sures to min­imise the shut­down length, the elec­tri­cal and in­stru­men­ta­tion de­sign was op­ti­mised for time ef­fec­tive in­stal­la­tion and com­mis­sion­ing. This paper out­lines the elec­tri­cal and in­stru­men­ta­tion de­sign for DDBA; ex­plores the in­stal­la­tion time de­ter­min­ing is­sues and how these were ad­dressed; and re­ports on the lessons learnt from the ac­tual in­stal­la­tion and com­mis­sion­ing process.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPAB133  
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MOPVA026 Effects of Insertion Devices on Stored Electron Beam of High Energy Photon Source undulator, photon, emittance, brilliance 911
 
  • X.Y. Li, Z. Duan, D. Ji, Y. Jiao, Y.F. Yang
    IHEP, Beijing, People's Republic of China
  
  The High En­ergy Pho­ton Source (HEPS) is a 4th gen­er­a­tion, 6-Gev, ul­tralow-emit­tance, pho­ton source pro­ject in China. High bright­ness hard X-ray beams at the en­ergy par­tic­u­larly above 10kev are pro­vided by in­ser­tion de­vices in­stalled in straight sec­tions of the stor­age ring. Bright­ness tun­ing curves of 14 ID beam­lines planned in HEPS first stage are ob­tained after de­sign­ing their pa­ra­me­ters. How­ever the pres­ence of these in­ser­tion de­vices pro­duce sev­eral ef­fects on the beam per­for­mances in­clud­ing be­ta­tron tunes, be­ta­tron am­pli­tude func­tions, closed orbit, emit­tance and dy­namic aper­ture etc. It is found that the ver­ti­cal oc­tu­pole ef­fect due to the four­teen IDs under the pre­sent schemes pro­duce the most sig­nif­i­cant ef­fect on the ver­ti­cal dy­namic aper­ture re­duc­tion. The ID field error ef­fects on close orbit can be com­pletely com­pen­sated by two cor­rec­tors ad­ja­cent the ID at the both side. The hor­i­zon­tal emit­tance re­duces to 36pm.​rad due to the damp­ing wig­gler ef­fect of IDs with field error after the orbit cor­rec­tion is also ob­tained.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPVA026  
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TUPAB115 Impact of Electron Beam Heating on Insertion Devices at Diamond Light Source electron, wiggler, cryogenics, insertion-device 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 wiggler, storage-ring, undulator, insertion-device 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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TUPVA015 Radiation Levels at the LHC: 2012, 2015 and 2016 Proton Physics Operations in View of HL-LHC requirements luminosity, radiation, operation, proton 2075
 
  • C. Martinella, M. Brugger, S. Danzeca, R. Garcia Alia, Y. Kadi, O. Stein, C. Xu
    CERN, Geneva, Switzerland
  
  The va­ri­ety of beam losses pro­duced in the Large Hadron Col­lider (LHC) cre­ates a mixed and com­plex ra­di­a­tion field. Dur­ing 2012, 2015 and 2016, Beam Loss Mon­i­tors and Rad­Mons were used to mon­i­tor the inte-grated dose and the High En­ergy Hadrons flu­ence in order to an­tic­i­pate the elec­tron­ics degra­da­tion and inves-tigate the cause of fail­ures. The an­nual ra­di­a­tion lev­els are com­pared; high­light­ing the mech­a­nisms in the pro-duc­tion of beam losses and the im­pact of the dif­fer­ent squeeze and cross­ing angle. In ad­di­tion, the in­crease of beam-gas in­ter­ac­tion is dis­cussed com­par­ing op­er­a­tions at 25 ns and 50 ns bunch spac­ing. A strat­egy is pre­sented to allow for a con­tin­u­ous re­spec­tive eval­u­a­tion dur­ing the up­com­ing LHC and fu­ture High Lu­mi­nos­ity LHC (HL-LHC) op­er­a­tions.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA015  
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TUPVA021 Impact of Collision Debris in the HL-LHC ATLAS and CMS Insertions luminosity, proton, optics, radiation 2093
 
  • A. Tsinganis, F. Cerutti
    CERN, Geneva, Switzerland
  
  The High Lu­mi­nos­ity up­grade of the LHC (HL-LHC) fore­sees the base­line op­er­a­tion of the ac­cel­er­a­tor at a 5 times higher peak lu­mi­nos­ity (5.0x1034cm-2s−1). The im­pact of col­li­sion de­bris on the mag­nets and other equip­ment in the triplet re­gion and match­ing sec­tion of the ATLAS and CMS in­ser­tions has been eval­u­ated by means of de­tailed FLUKA mod­els im­ple­ment­ing the lat­est op­tics and lay­out ver­sion. Qual­i­ta­tive and quan­ti­ta­tive dif­fer­ences be­tween the ver­ti­cal and hor­i­zon­tal beam cross­ing schemes are high­lighted. With mea­sures in place to mit­i­gate the ef­fects of the in­ter­rup­tion of the beam screen in the triplet in­ter­con­nec­tions and the Q4 aper­ture re­duc­tion, peak dose val­ues in the su­per­con­duct­ing coils re­main below 30MGy in the triplet-D1 and below 12MGy in the match­ing sec­tion mag­nets for an in­te­grated lu­mi­nos­ity of 3000fb-1. Peak power den­sity val­ues are lower than 3mW/cm3 and 1mW/cm3 in the triplet and match­ing sec­tion re­spec­tively. Total heat loads in mag­nets, col­li­ma­tors, masks and ab­sorbers were also es­ti­mated, along with dose and par­ti­cle flu­ence maps rel­e­vant for Ra­di­a­tion to Elec­tron­ics (R2E) as­pects. The ef­fect of a dis­place­ment of the in­ter­ac­tion point is also ad­dressed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA021  
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WEPAB036 The Diffraction Limited Light Source Elettra 2.0 emittance, dipole, insertion-device, lattice 2660
 
  • E. Karantzoulis
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  
  Elet­tra 2.0 is the next gen­er­a­tion to re­place Elet­tra, the Ital­ian third gen­er­a­tion light source. The new ma­chine will have an emit­tance of 0.25 nm-rad with co­her­ent flux about two or­ders of mag­ni­tude higher than that of the pre­sent ma­chine. In the paper the as­pects of its fea­si­bil­ity are de­scribed and dis­cussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB036  
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WEPAB043 DQBA Lattice Option for the KEK-LS Project emittance, lattice, insertion-device, dynamic-aperture 2675
 
  • K. Harada, N. Higashi, S. Nagahashi, N. Nakamura, S. Sakanaka, A. Ueda
    KEK, Ibaraki, Japan
  • S.M. Liuzzo
    ESRF, Grenoble, France
  
  KEK-LS is a fourth gen­er­a­tion 3GeV light source and will be con­structed in KEK Tsukuba cam­pus. The lat­tice is 20 cells of ESRF type HMBA (Hy­brid Multi Bend Achro­mat) with short straight sec­tion that en­ables to dou­ble the num­bers of in­ser­tion de­vice beam lines. The cir­cum­fer­ence is about 570m, and the hor­i­zon­tal nat­ural emit­tance about 133pm­rad. The con­cep­tual de­sign re­port (CDR) was pub­lished in Oc­to­ber 2016. Adding two quadru­pole mag­nets to the short straight sec­tion of the orig­i­nal lat­tice in CDR, the lat­tice de­sign flex­i­bil­ity, emit­tance and dy­namic aper­tures are im­proved. In this pre­sen­ta­tion, we show this new DQBA (Dou­ble Quadru­pole Bend Achro­mat) lat­tice op­tion for KEK-LS pro­ject.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB043  
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WEPAB093 Mechanical Engineering of the Diamond DDBA Upgrade insertion-device, storage-ring, vacuum, electron 2794
 
  • N.P. Hammond, A.G. Day, R.K. Grant, R. Holdsworth, J. Kay
    DLS, Oxfordshire, United Kingdom
  
  The Di­a­mond stor­age ring has been up­graded to re­place one cell of Dou­ble Bend Achro­mat (DBA) with a Dou­ble Dou­ble Bend Achro­mat (DDBA). This up­grade has en­abled the con­struc­tion of a new straight to in­stall a much brighter in­ser­tion de­vice X-ray source for a new beam­line rather than use a weaker bend­ing mag­net source. The en­gi­neer­ing chal­lenges and ex­pe­ri­ence from this pro­ject are de­scribed, es­pe­cially those as­pects rel­e­vant to build­ing a fu­ture low emit­tance stor­age ring at Di­a­mond.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB093  
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WEPIK030 Experimental Validation of the Achromatic Telescopic Squeezing Scheme at the LHC optics, collimation, injection, luminosity 2992
 
  • S.D. Fartoukh, R. Bruce, F.S. Carlier, J.M. Coello de Portugal, A. Garcia-Tabares, E.H. Maclean, L. Malina, A. Mereghetti, D. Mirarchi, T. Persson, M. Pojer, L. Ponce, S. Redaelli, B. Salvachua, P.K. Skowroński, M. Solfaroli, R. Tomás, D. Valuch, A. Wegscheider, J. Wenninger
    CERN, Geneva, Switzerland
  
  The Achro­matic Tele­scopic Squeez­ing (ATS) [1] scheme of­fers new tech­niques to de­liver un­prece­dent­edly small beam spot size at the in­ter­ac­tion points of the ATLAS and CMS ex­per­i­ments of the LHC, while per­fectly con­trol­ling the chro­matic prop­er­ties of the cor­re­spond­ing op­tics (lin­ear and non-lin­ear chro­matic­i­ties, off-mo­men­tum beta-beat­ing, spu­ri­ous dis­per­sion in­duced by the cross­ing bumps). The first se­ries of beam tests with ATS op­tics were achieved dur­ing the LHC Run I (2011/2012) for a first val­i­da­tion of the ba­sics of the scheme at small in­ten­sity. In 2016, a new gen­er­a­tion of more per­form­ing ATS op­tics was de­vel­oped and more ex­ten­sively tested in the ma­chine, still with probe beams for op­tics mea­sure­ment and cor­rec­tion at β*=10 cm, but also with a few nom­i­nal bunches to es­tab­lish first col­li­sions at nom­i­nal β* (40 cm) and be­yond (33 cm), and to analy­sis the ro­bust­ness of these op­tics in terms of col­li­ma­tion and ma­chine pro­tec­tion. The paper will high­light the most rel­e­vant and con­clu­sive re­sults which were ob­tained dur­ing this sec­ond se­ries of ATS tests.
[1] S. Fartoukh , Phys. Rev. ST Accel. Beams 16, 111002
 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK030  
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WEPIK099 Beam Lifetime Studies for SPS Storage Ring storage-ring, insertion-device, operation, simulation 3178
 
  • P. Sudmuang, N. Juntong, P. Klysubun, T. Pulampong, N. Suradet
    SLRI, Nakhon Ratchasima, Thailand
  
  Lim­i­ta­tion of beam life­time was sys­tem­at­i­cally in­ves­ti­gated and stud­ied for Siam Pho­ton Source (SPS) stor­age ring. The ob­jec­tive was to iden­tify the main cause of the ob­served re­duc­tion of beam life­time. The sim­u­la­tions of mo­men­tum ac­cep­tance and Tou­schek life­time were per­formed, in­cor­po­rat­ing non-lin­ear ef­fects gen­er­ated by the in­stalled high-field in­ser­tion de­vices. The Tou­schek life­time was mea­sured as a func­tion of RF volt­age and com­pared with the val­ues ob­tained from sim­u­la­tion. The mea­sure­ments were per­formed for a va­ri­ety of dif­fer­ent op­er­a­tion con­di­tions of the in­ser­tion de­vices and dif­fer­ent chro­matic­i­ties.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK099  
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THPIK057 Development of a High-Power X-Band RF Rotary Joint simulation, linac, network, scattering 4224
 
  • J. Liu, H.B. Chen, J. Shi, X.W. Wu, H. Zha
    TUB, Beijing, People's Republic of China
  
  RF ro­tary joints allow the in­de­pen­dent move­ment be-tween the RF power source and the ac­cel­er­at­ing tube of a lin­ear ac­cel­er­a­tor (linac). In this paper, the de­sign of a com­pact X-band (9.3 GHz) high-power RF ro­tary joint is pre­sented. Sim­u­la­tion re­sults il­lus­trate that RF pa­ra­me­ters (the scat­ter­ing ma­trix) of this ro­tary joint keep sta­ble in the ar­bi­trary ro­ta­tion angle. The max­i­mum re­turn loss is about -30 dB, the in­sert loss is less than 0.11 dB, and the vari­ance of out­put phase shifts is below 1 de­gree while ro­tat­ing the joint. RF mea­sure­ment on the ro­tary joint using Vec­tor-Net­work analyser is also con­ducted and pre­sented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK057  
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THPIK061 3D Model Analysis of Cavity for CSNS DTL DTL, cavity, simulation, neutron 4236
 
  • P.H. Qu, M.X. Fan, B. Li, Y. Wang
    CSNS, Guangdong Province, People's Republic of China
  • Q. Chen, K.Y. Gong, A.H. Li, H.C. Liu, F.X. Zhao
    IHEP, Beijing, People's Republic of China
  
  An Al­varez-type Drift tube linac (DTL) was uti­lized to ac­cel­er­ate an H− ion beam from 3 MeV to 80 MeV of China Spal­la­tion neu­tron source (CSNS). RF field pro­file is al­ways de­vi­ate from the de­sign curve due to er­rors in fab­ri­ca­tion and as­sem­bly of the struc­ture cells, thus RF tun­ing of DTL is nec­es­sary. CSNS DTL op­er­ates in zero mode and has long tank, so ac­cel­er­at­ing field of which is un­sta­ble, this prob­lem was solved through adding post cou­plers at the both side of cav­ity wall. In order to speed up the sched­ule of DTL low power RF tun­ing, we an­a­lyzed the op­er­at­ing mode, field flat­ness with slug tuners, field sta­bi­liza­tion with post cou­plers by CST Micro wave stu­dio (MWS) mainly with eigen­mode solver in ad­vance. Con­sid­er­ing sav­ing the com­puter mem­ory and in­creas­ing the cal­cu­la­tion speed, we di­vided each tank model into three short units. Slug tuner depth and PC-DT gap of DTL-1 and DTL-3 by sim­u­la­tion were shown which im­proved the ef­fi­ciency of CSNS DTL RF tun­ing.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK061  
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THPIK088 A Compact 10 kW Solid-State RF Power Amplifier at 352 MHz operation, impedance, network, linac 4292
 
  • D.S. Dancila, A. Rydberg
    Uppsala University, Department of Engineering Sciences, Uppsala, Sweden
  • A.E.T. Hjort, L. Hoang Duc, M.H. Holmberg, M. Jobs, R.J.M.Y. Ruber
    Uppsala University, Uppsala, Sweden
  
  A com­pact 10 kW RF power am­pli­fier at 352 MHz was de­vel­oped at FREIA for the Eu­ro­pean Spal­la­tion Source, ESS. The spec­i­fi­ca­tions of ESS for the con­cep­tion of am­pli­fiers are re­lated to its pulsed op­er­a­tion: 3.5 ms pulse length and a duty cycle of 5\%. The re­al­ized am­pli­fier is com­posed of eight kilo­watt level mod­ules, com­bined using a pla­nar Gysel 8-way com­biner. The com­biner has a low in­ser­tion loss of only 0.2 dB, mea­sured at 10 kW peak power. Each mod­ule is built around a com­mer­cially avail­able LDMOS tran­sis­tor in a sin­gle-ended ar­chi­tec­ture. Dur­ing the final mea­sure­ments, a total out­put peak power of 10.5 kW was mea­sured.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK088  
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THPIK101 Quarter Wavelength Combiner for an 8.5kW Solid-State Amplifier and Conceptual Study of Hybrid Combiners operation, distributed, synchrotron, status 4324
 
  • T.-C. Yu, F.Y. Chang, L.-H. Chang, M.H. Chang, L.J. Chen, F.-T. Chung, M.-C. Lin, Z.K. Liu, C.H. Lo, C.L. Tsai, Ch. Wang, M.-S. Yeh
    NSRRC, Hsinchu, Taiwan
  
  Ex­per­i­men­tal re­sults to com­bine ten 900 W solid-state am­pli­fier mod­ules based on typ­i­cal quar­ter wave­length 10-way com­bin­ers are de­scribed for a total of 8.5 kW RF power out­put at 500 MHz. The power gain and phase dis­tri­b­u­tion among the ten mod­ules are mea­sured and cal­cu­lated to sense the com­bi­na­tion ef­fi­ciency. The com­bi­na­tion ef­fi­ciency of 100 mod­ules dif­fer­ing in power gain and phase dis­tri­b­u­tion is the­o­ret­i­cally analysed. Groups of 5, 10, 25, 50 and 100 units are used in 4, 3, 2, and 1-stage power com­bi­na­tion for total 100 units and the char­ac­ter­is­tics are cal­cu­lated and in­ves­ti­gated, in­clud­ing band­width, ef­fi­ciency and even re­dun­dancy under var­i­ous out­put VSWR lev­els. To sim­plify com­bin­ing com­plex­ity and to elim­i­nate the draw­backs of sin­gle stage com­bin­ers, a multi-way 2-stage coax­ial to wave­guide com­biner is thus pro­posed as an ex­pand­able power com­biner.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK101  
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THPIK109 The RF Distribution System for the ESS detector, cavity, linac, neutron 4352
 
  • T.R. Edgecock, N. Turner
    University of Huddersfield, Huddersfield, United Kingdom
  • P. Aden, D. Naeem, R. Smith
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • A. Sunesson, R.A. Yogi
    ESS, Lund, Sweden
  
  The RF dis­tri­b­u­tion sys­tem for the Eu­ro­pean Spal­la­tion Source will be one of the largest sys­tems ever built. It will dis­trib­ute the power from 146 power sources to the two types of ESS cav­ity at two dif­fer­ent fre­quen­cies and will use one line per cav­ity for re­silience. It will con­sist of a total of around 3.5 km of wave­guide and coax­ial line and over 1500 hun­dred bends. It is de­signed to trans­port this RF power over a dis­tance of up to 40m per line, while min­imis­ing losses, avoid­ing re­flec­tions and al­low­ing the mon­i­tor­ing of per­for­mance. This con­tri­bu­tion will give an overview of the de­sign of the sys­tem and its sta­tus. In­stal­la­tion is due to start in Sep­tem­ber 2017.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK109  
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THPVA028 Multi-Bunch Instabilities Measurement and Analysis at the Diamond Light Source impedance, damping, vacuum, insertion-device 4485
 
  • R. Bartolini, R.T. Fielder, E. Koukovini-Platia, G. Rehm
    DLS, Oxfordshire, United Kingdom
  
  The char­ac­ter­i­sa­tion of the multi-bunch dy­nam­ics at the Di­a­mond light source is per­formed with an ad­vanced TMBF sys­tem that is ca­pa­ble of op­er­at­ing fast grow damp ex­per­i­ments thus al­low­ing the ex­plo­ration of many ma­chine con­di­tions. We re­port here the lat­est re­sults of the mea­sure­ment cam­paign, the im­pli­ca­tion on the ma­chine im­ped­ance model and some of the in­tri­ca­cies of the analy­sis and in­ter­pre­ta­tion of the ex­per­i­men­tal data.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPVA028  
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