Author: Kuske, P.
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TUPOR003 CSR-Driven Longitudinal Single Bunch Instability with Negative Momentum Compaction Factor 1651
 
  • P. Kuske
    HZB, Berlin, Germany
 
  Ac­cept­able agree­ment is found be­tween ex­per­i­men­tal re­sults ob­tained at the Metrol­ogy Light Source (MLS) op­er­ated with neg­a­tive mo­men­tum com­paction fac­tor, α, and the­o­ret­i­cal es­ti­mates of the CSR-dri­ven thresh­old cur­rents. The­o­ret­i­cal in­sta­bil­ity thresh­olds are es­ti­mated by nu­mer­i­cally solv­ing the Vlasov-Fokker-Planck equa­tion and/or by multi par­ti­cle track­ing and tak­ing into ac­count the shielded CSR-in­ter­ac­tion. Some of the is­sues with the cal­cu­la­tions, the de­ter­mi­na­tion of the the­o­ret­i­cal thresh­olds as well as the de­riva­tion of a gen­eral scal­ing law will be pre­sented  
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TUPOW034 Status Report of the Berlin Energy Recovery Linac Project BERLinPro 1827
 
  • M. Abo-Bakr, W. Anders, K.B. Bürkmann-Gehrlein, A.B. Büchel, P. Echevarria, A. Frahm, H.-W. Glock, F. Glöckner, F. Göbel, B.D.S. Hall, S. Heling, H.-G. Hoberg, A. Jankowiak, C. Kalus, T. Kamps, G. Klemz, J. Knobloch, J. Kolbe, G. Kourkafas, J. Kühn, B.C. Kuske, P. Kuske, J. Kuszynski, D. Malyutin, A.N. Matveenko, M. McAteer, A. Meseck, C.J. Metzger-Kraus, R. Müller, A. Neumann, N. Ohm, K. Ott, E. Panofski, F. Pflocksch, J. Rahn, J. Rudolph, M. Schmeißer, O. Schüler, M. Schuster, J. Ullrich, A. Ushakov, J. Völker
    HZB, Berlin, Germany
 
  Funding: Work supported by the German Bundesministerium für Bildung und Forschung, Land Berlin and grants of Helmholtz Association
The Helmholtz Zen­trum Berlin is con­struct­ing the En­ergy Re­cov­ery Linac Pro­to­type BERLinPro at the Berlin Adler­shof site. The pro­ject is in­tended to ex­pand the re­quired ac­cel­er­a­tor physics and tech­nol­ogy knowl­edge manda­tory for the de­sign, con­struc­tion and op­er­a­tion of fu­ture syn­chro­tron light sources. The pro­ject goal is the gen­er­a­tion of a high cur­rent (100 mA), high bril­liance (norm. emit­tance below 1 mm mrad) cw elec­tron beam. We re­port on the pro­ject progress: since spring 2015 the build­ing is under con­struc­tion, ready for oc­cu­pancy in Jan­u­ary 2017. The plan­ning phase for the first pro­ject stage is com­pleted for the warm ma­chine parts, the SRF gun and partly for the SRF booster. Most of the com­po­nents have been or­dered and are in fab­ri­ca­tion with some al­ready de­liv­ered. An up­date of the sta­tus of the var­i­ous sub­pro­jects as well as a sum­mary of fu­ture ac­tiv­i­ties will be given. Pro­ject mile­stones and de­tails of the time­line will be re­viewed.
 
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WEOAA01 Transverse Emittance Exchange for Improved Injection Efficiency 2028
 
  • P. Kuske, F. Kramer
    HZB, Berlin, Germany
 
  In most cases beam is in­jected into elec­tron stor­age rings in the hor­i­zon­tal plane and off-axis. The larger the hor­i­zon­tal emit­tance of the in­jected beam the larger the ac­cep­tance of the ring has to be. The in­jected beam is usu­ally de­liv­ered by a syn­chro­tron. In case the ver­ti­cal ac­cep­tance of the ring is suf­fi­ciently large one can take ad­van­tage of the small ver­ti­cal emit­tance reached in well aligned and tuned syn­chro­trons since the trans­verse emit-tances can be ex­changed with the help of skew quadru-pole mag­nets. A few pos­si­ble processes will be dis­cussed: emit­tance ex­change with sta­tic mag­nets in the trans­fer line be­tween syn­chro­tron and ring or emit­tance ex­change in the syn­chro­tron shortly be­fore ex­trac­tion with time de­pen­dent mag­nets. This could be a sud­denly switched-on nor­mal or skew quadru­pole mag­net or skew quadru-pole fields os­cil­lat­ing at a fre­quency ful­fill­ing the reso-nance con­di­tion. Es­ti­mates for these mag­nets and their de­sign will be given.  
slides icon Slides WEOAA01 [0.852 MB]  
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WEPOW007 Status and Prospects of the BESSY II Injector System 2826
 
  • T. Atkinson, W. Anders, P. Goslawski, A. Jankowiak, F. Kramer, P. Kuske, D. Malyutin, A.N. Matveenko, A. Neumann, M. Ries, M. Ruprecht, A. Schälicke, T. Schneegans, D. Schüler, P.I. Volz, G. Wüstefeld
    HZB, Berlin, Germany
  • H.G. Glass
    BESSY GmbH, Berlin, Germany
 
  The BESSY II in­jec­tor sys­tem con­sists of a 50 MeV Linac, in­stalled in prepa­ra­tion for TopUp op­er­a­tion, and a 10 Hz fast-ramp­ing booster syn­chro­tron. The sys­tem pro­vides in­jec­tion ef­fi­cien­cies into the BESSY II stor­age ring well above 90 % . This con­tri­bu­tion re­ports on the pre­sent sta­tus, mea­sure­ments of en­ergy ac­cep­tance and other es­sen­tial beam pa­ra­me­ters as well as stud­ies on cou­pled-bunch-by-bunch in­sta­bil­ity. Re­quire­ments for BESSY-VSR and pos­si­ble up­grade sce­nar­ios are dis­cussed.  
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WEPOW009 The Bessy Vsr Project for Short X-Ray Pulse Production 2833
 
  • A. Jankowiak, W. Anders, T. Atkinson, H. Ehmler, A. Föhlisch, P. Goslawski, K. Holldack, J. Knobloch, P. Kuske, D. Malyutin, A.N. Matveenko, R. Müller, A. Neumann, K. Ott, M. Ries, M. Ruprecht, A. Schälicke, A.V. Vélez, G. Wüstefeld
    HZB, Berlin, Germany
  • A. Burrill
    SLAC, Menlo Park, California, USA
 
  Funding: Work supported by the German Bundesministerium für Bildung und Forschung, Land Berlin and grants of the Helmholtz Association
HZB has started the in­no­v­a­tive pro­ject, BESSY VSR, to up­grade the 1.7 GeV syn­chro­tron ra­di­a­tion source BESSY II. Its goal is to pro­vide both 1.7 ps and 15 ps long, in­tense X-ray pulses si­mul­ta­ne­ously at all beam lines. These pulses are gen­er­ated by en­hanced lon­gi­tu­di­nal bunch fo­cus­ing using su­per­con­duct­ing 5-cell cav­i­ties op­er­at­ing at 1.5 GHz and 1.75 GHz. The re­sult­ing beat­ing of the volt­ages cre­ates al­ter­nat­ing long and short buck­ets that can be cus­tom filled. As a first major step, pro­to­type su­per­con­duct­ing cav­i­ties, ini­tially only cooled to 4.4 K and thus op­er­at­ing at re­duced volt­age, will be in­stalled into the BESSY II stor­age ring. Phys­i­cal and tech­ni­cal as­pects of this pro­posal where re­cently stud­ied* and the re­sults and pro­ject sta­tus are pre­sented.
* A. Jankowiak, J. Knobloch for the BESSY VSR team, Technical Design Study BESSY VSR, doi:10.5442/R0001, Helmholtz-Zentrum Berlin (Germany), June 2015.
 
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WEPOW011 BESSY II Supports an Extensive Suite of Timing Experiments 2840
 
  • R. Müller, T. Birke, F. Falkenstern, K. Holldack, P. Kuske, A. Schälicke, D. Schüler
    HZB, Berlin, Germany
  • H.G. Glass, R. Ovsyannikov
    BESSY GmbH, Berlin, Germany
 
  The syn­chro­tron light source fa­cil­ity BESSY II has put top-up and a fast orbit feed­back (FOFB) into op­er­a­tion in 2013. Both op­er­a­tional im­prove­ments have ma­tured and turned out to be es­pe­cially ben­e­fi­cial for the ad­vanced tim­ing op­por­tu­ni­ties sup­ported at BESSY. In com­bi­na­tion with very tight in­jec­tion ef­fi­ciency re­quire­ments a thor­ough un­der­stand­ing of top-up in­jec­tions under all op­er­a­tional con­di­tions has been de­vel­oped. Con­se­quently ar­bi­trary bunch cur­rents can be di­aled in and main­tained on de­mand. In stan­dard mode, a very pure camshaft bunch is avail­able both in gen­eral for laser pump/X-ray probe and for pseudo sin­gle bunch ex­per­i­ments at the MHz chop­per beam­line. 3 con­stant high cur­rent bunches sup­port the FEM­TOSPEX slic­ing fa­cil­ity. An ad­di­tional bunch can be res­o­nantly ex­cited and pulse picked via cus­tom orbit bumps at 3 dif­fer­ent un­du­la­tor beam­lines (PPRE). Due to the FOFB the clas­si­cal tim­ing modes "sin­gle bunch" and "low alpha" fea­ture an at­trac­tive point­ing sta­bil­ity.  
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WEPOW012 Hardware Upgrades Improve the Reliability at BESSY II 2844
 
  • A. Schälicke, W. Anders, J. Borninkhof, V. Dürr, P. Goslawski, A. Hellwig, A. Heugel, H.-G. Hoberg, H. Hoffmann, A. Jankowiak, J. Kolbe, P. Kuske, G. Mielczarek, R. Müller, D. Pflückhahn, M. Ries, S. Rotterdam, M. Ruprecht, B. Schriefer, D. Simmering, H. Stein
    HZB, Berlin, Germany
 
  The syn­chro­tron light source BESSY II is now in its sec­ond decade of op­er­a­tion. Al­ready in 2013 both top-up and fast orbit feed­back have been in­tro­duced into user op­er­a­tion. Cur­rently, the fa­cil­ity is un­der­go­ing sig­nif­i­cant hard­ware up­grades in order to ful­fill the in­creas­ing de­mands of its user com­mu­nity in terms of re­li­a­bil­ity, sta­bil­ity and flex­i­bil­ity. These in­clude re­place­ment of the DORIS cav­i­ties with EU HOM damped cav­i­ties, the up­grade of the RF trans­mit­ters to solid state am­pli­fiers, im­ple­men­ta­tion of the shifted waist op­tics for the new in-vac­uum un­du­la­tor, and re­fur­bish­ment of the su­per­con­duct­ing multi-pole wig­gler. In this con­tri­bu­tion sta­tus of BESSY II op­er­a­tion and the up­grade pro­jects is re­ported.  
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THPOW039 Measurements of the Lattice Modifications for the Cryogenic Undulator CPMU17 4031
 
  • J. Bahrdt, D.B. Engel, W. Frentrup, P. Goslawski, P. Kuske, R. Müller, M. Ries, M. Ruprecht, A. Schälicke
    HZB, Berlin, Germany
 
  A 2 mrad-canted dou­ble un­du­la­tor sys­tem is in prepa­ra­tion as the wide en­ergy range light source for the En­ergy Ma­te­r­ial in-situ Lab­o­ra­tory EMIL at the HZB stor­age ring BESSY II. The cryo­genic un­du­la­tor CPMU-17 is the hard X-ray de­vice of the dou­ble un­du­la­tor sys­tem. The soft X-ray un­du­la­tor UE-48 is of the APPLE II type. It was in­stalled and com­mis­sioned a few months ago, whereas the CPMU-17 is under fab­ri­ca­tion. The CPMU-17 will em­ploy a min­i­mum mag­netic gap of 5.5mm. In­clud­ing a CuNi-foil for RF-shield­ing and geo­met­ric tol­er­ances the free aper­ture is planned to be 5.0 mm. The BESSY II lat­tice has been mod­i­fied lo­cally in order to cope with the small gap de­vice. The adapted be­ta­tron func­tions with a shifted ver­ti­cal beam waist were mea­sured and fit­ted with LOCO. The new op­tics agrees with the pre­dicted per­for­mance. The free aper­ture at the in­stal­la­tion place of the CPMU-17 was mea­sured with four ver­ti­cal scrap­ers. It is com­pat­i­ble with the pro­jected min­i­mum un­du­la­tor gap. Fi­nally, the mea­sured in­jec­tion ef­fi­ciency with the new EMIL op­tics switched on is com­pat­i­ble with top-up op­er­a­tion (in­jec­tion ef­fi­ciency ≥ 90 %).  
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