Author: Yakovlev, V.P.
Paper Title Page
MOPAB190 An 8 GeV Linac as the Booster Replacement in the Fermilab Power Upgrade 643
 
  • D.V. Neuffer, S.A. Belomestnykh, M. Checchin, D.E. Johnson, S. Posen, E. Pozdeyev, V.S. Pronskikh, N. Solyak, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  
  Funding: This manuscript has been authored by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics.
In­creas­ing the Main In­jec­tor (MI) beam power above ~1.2 MW re­quires re­place­ment of the 8 GeV Booster by a higher in­ten­sity al­ter­na­tive. Pre­vi­ously, rapid-cy­cling syn­chro­tron (RCS) and Linac so­lu­tions were con­sid­ered for this pur­pose. In this paper, we con­sider the Linac ver­sion that pro­duces 8 GeV H− beam for in­jec­tion into the Re­cy­cler Ring (RR) or Main In­jec­tor (MI). The Linac takes ~1 GeV beam from the PIP-II Linac and ac­cel­er­ates it to ~2 GeV in a cw SRF linac, fol­lowed by a ~2-8 GeV pulsed linac using 1300 MHz cry­omod­ules. The linac com­po­nents in­cor­po­rate re­cent im­prove­ments in SRF tech­nol­ogy. The linac con­fig­u­ra­tion and beam dy­nam­ics re­quire­ments are pre­sented. In­jec­tion op­tions are dis­cussed. Re­search needed to im­ple­ment the Booster re­place­ment is de­scribed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB190  
About • paper received ※ 15 May 2021       paper accepted ※ 28 May 2021       issue date ※ 14 August 2021  
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TUPAB166 A New Design of a Dressed Balloon Cavity with Superior Mechanical Properties 1769
 
  • R.A. Kostin, C. Jing, S. Ross
    Euclid Beamlabs, Bolingbrook, USA
  • I.V. Gonin, T.N. Khabiboulline, G.V. Romanov, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  • M.P. Kelly
    ANL, Lemont, Illinois, USA
  • R.E. Laxdal
    TRIUMF, Vancouver, Canada
  
  Funding: Work supported by the SBIR program of the U.S. Department of Energy, under grant DE-SC0020781
Su­per­con­duct­ing spoke cav­i­ties are prone to mul­ti­pactor - res­o­nant raise of a num­ber of elec­trons due to sec­ondary emis­sion. Re­cently pro­posed and tested by TRI­UMF bal­loon-type spoke cav­ity showed an out­stand­ing mul­ti­pactor (MP) sup­pres­sion prop­erty but un­for­tu­nately se­ri­ous Q degra­da­tion at high fields. A new fully de­vel­oped de­sign of a dressed bal­loon cav­ity which can be used for any pro­ton linac SSR2 sec­tion is de­vel­oped. The de­sign in­cor­po­rates ad­di­tional EP ports for high Q-fac­tor demon­stra­tion. Su­pe­rior prop­er­ties are demon­strated, such as ef­fec­tive mul­ti­pactor sup­pres­sion, 40% lower Lorentz force co­ef­fi­cient, zero sen­si­tiv­ity to ex­ter­nal pres­sure. This paper pre­sents the re­sults of cou­pled struc­tural Mul­ti­physics analy­sis, and en­gi­neer­ing de­sign of the dressed bal­loon cav­ity with EP ports. 		 
poster icon Poster TUPAB166 [1.394 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB166  
About • paper received ※ 15 May 2021       paper accepted ※ 21 June 2021       issue date ※ 12 August 2021  
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WEPAB138 Superconducting RF Gun with High Current and the Capability to Generate Polarized Electron Beams 2936
 
  • I. Petrushina
    SUNY SB, Stony Brook, New York, USA
  • S.A. Belomestnykh, S. Kazakov, T.N. Khabiboulline, M. Martinello, Y.M. Pischalnikov, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  • J.C. Brutus, P. Inacker, Y.C. Jing, V. Litvinenko, J. Skaritka, E. Wang
    BNL, Upton, New York, USA
  • J.M. Grames, M. Poelker, R. Suleiman, E.J-M. Voutier
    JLab, Newport News, Virginia, USA
  
  High-cur­rent low-emit­tance CW elec­tron beams are in­dis­pens­able for nu­clear and high-en­ergy physics fixed tar­get and col­lider ex­per­i­ments, cool­ing high en­ergy hadron beams, gen­er­at­ing CW beams of mono­en­er­getic X-rays (in FELs) and gamma-rays (in Comp­ton sources). Po­lar­iza­tion of elec­trons in these beams pro­vides extra value by open­ing a new set of ob­serv­ables and fre­quently im­prov­ing the data qual­ity. We re­port on the up­grade of the unique and fully func­tional CW SRF 1.25 MeV SRF gun, built as part of the Co­her­ent elec­tron Cool­ing (CeC) pro­ject, which has demon­strated sus­tained CW op­er­a­tion with CsK2Sb pho­to­cath­odes gen­er­at­ing elec­tron bunches with record-low trans­verse emit­tances and record-high bunch charge ex­ceed­ing 10 nC. We pro­pose to ex­tend the ca­pa­bil­i­ties of this sys­tem to high av­er­age cur­rent of 100 mil­liampere in two steps: in­creas­ing the cur­rent 30-fold at each step with the goal to demon­strate re­li­able long-term op­er­a­tion of the high-cur­rent low-emit­tance CW SRF guns. We also pro­pose to test po­lar­ized GaAs pho­to­cath­odes in the ul­tra-high vac­uum (UHV) en­vi­ron­ment of the SRF gun, which has never been suc­cess­fully demon­strated in RF ac­cel­er­a­tors.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB138  
About • paper received ※ 25 May 2021       paper accepted ※ 29 July 2021       issue date ※ 23 August 2021  
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THPAB156 Built-in Thermionic Electron Source for an SRF Linacs 4062
 
  • I.V. Gonin, S. Kazakov, R.D. Kephart, T.N. Khabiboulline, T.H. Nicol, N. Solyak, J.C.T. Thangaraj, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  
  The de­sign of a thermionic elec­tron source con­nected di­rectly to a su­per­con­duct­ing cav­ity, the key part of an SRF gun, is de­scribed. The re­sults of beam dy­nam­ics op­ti­miza­tion are pre­sented which allow lack of beam cur­rent in­ter­cept­ing in the su­per­con­duct­ing cav­ity. The elec­tron source con­cept is pre­sented in­clud­ing the cath­ode-grid as­sem­bly, ther­mal in­su­la­tion of the cath­ode from the cav­ity, and the gun res­onator de­sign. The cav­ity ther­mal load caused by the gun is an­a­lyzed in­clud­ing the sta­tic heat load, black body ra­di­a­tion, back­ward elec­tron heat­ing, etc.  
poster icon Poster THPAB156 [0.670 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB156  
About • paper received ※ 19 May 2021       paper accepted ※ 12 July 2021       issue date ※ 28 August 2021  
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THPAB336 Novel Magnetron Operation and Control Methods for Superconducting RF Accelerators 4442
 
  • G.M. Kazakevich, R.P. Johnson
    Muons, Inc, Illinois, USA
  • T.N. Khabiboulline, G.V. Romanov, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
  
  High power mag­netrons de­signed and op­ti­mized for in­dus­trial heat­ing, being in­jec­tion-locked, have been sug­gested to power su­per­con­duct­ing RF cav­i­ties for ac­cel­er­a­tors due to lower cost and higher ef­fi­ciency. How­ever, stan­dard op­er­a­tion meth­ods do not pro­vide high ef­fi­ciency with wide­band con­trol sup­press­ing mi­cro­phon­ics. We have de­vel­oped and ex­per­i­men­tally ver­i­fied novel meth­ods of op­er­at­ing and con­trol­ling the mag­netron that pro­vide sta­ble RF gen­er­a­tion with higher ef­fi­ciency and lower noise than other RF sources. By our method the mag­netrons op­er­ate with the anode volt­age no­tably lower than the self-ex­ci­ta­tion thresh­old im­prov­ing its per­for­mance. This is also a promis­ing way to in­crease tube re­li­a­bil­ity and longevity. A mag­netron op­er­at­ing with the anode volt­age lower than the self-ex­ci­ta­tion thresh­old, in so-called stim­u­lated co­her­ent gen­er­a­tion mode has spe­cial ad­van­tage for pulse op­er­a­tion with a gated in­jec­tion-lock­ing sig­nal. This elim­i­nates the need for ex­pen­sive pulsed HV mod­u­la­tors and ad­di­tion­ally in­creases the mag­netron RF source ef­fi­ciency due to ab­sence of losses in HV mod­u­la­tors.  
poster icon Poster THPAB336 [0.960 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB336  
About • paper received ※ 15 May 2021       paper accepted ※ 08 July 2021       issue date ※ 18 August 2021  
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THPAB343 Test Results of the Prototype SSR1 Cryomodule for PIP-II at Fermilab 4461
 
  • D. Passarelli, J. Bernardini, C. Boffo, B.M. Hanna, S. Kazakov, T.N. Khabiboulline, A. Lunin, J.P. Ozelis, M. Parise, Y.M. Pischalnikov, V. Roger, B. Squires, A.I. Sukhanov, G. Wu, V.P. Yakovlev, S. Zorzetti
    Fermilab, Batavia, Illinois, USA
  • C. Contreras-Martinez
    FRIB, East Lansing, Michigan, USA
  
  Funding: Work supported by Fermi Research Alliance, LLC under Contract No. DEAC02- 07CH11359 with the United States Department of Energy
A pro­to­type cry­omod­ule con­tain­ing eight Sin­gle Spoke Res­onators type-1 (SSR1) op­er­at­ing at 325 MHz and four su­per­con­duct­ing fo­cus­ing lenses has been suc­cess­fully as­sem­bled and cold tested in the frame­work of PIP-II pro­ject at Fer­mi­lab. The per­for­mance of cav­i­ties and fo­cus­ing lenses along with test re­sults of other cry­omod­ule’s key pa­ra­me­ters are pre­sented in this con­tri­bu­tion. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB343  
About • paper received ※ 20 May 2021       paper accepted ※ 08 August 2021       issue date ※ 26 August 2021  
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