Author: Pischalnikov, Y.M.
Paper Title Page
WEPWB109 PI Loop Resonance Control for the Dark Photon Experiment at 2 K using a 2.6 GHz SRF cavity 847
 
  • C. Contreras-Martinez, B. Giaccone, O.S. Melnychuk, A.V. Netepenko, Y.M. Pischalnikov, S. Posen, V.P. Yakovlev
    Fermilab, Batavia, Illinois, USA
 
  Two 2.6 GHz cav­i­ties are being used for dark pho­ton search at VTS in FNAL. Dur­ing test­ing at 2 K the cav­i­ties ex­pe­ri­ence fre­quency de­tun­ing caused by mi­cro­phon­ics and slow fre­quency drifts. The ex­per­i­ment re­quires that the two cav­i­ties have the same fre­quency within 5 Hz. These two cav­i­ties are equipped with fre­quency tuners con­sist­ing of three piezo ac­tu­a­tors. The piezo ac­tu­a­tors are used for fine-fast fre­quency tun­ing. A PI loop uti­liz­ing the piezos was used to main­tain both cav­i­ties at the same fre­quency, and the re­sults are pre­sented.  
poster icon Poster WEPWB109 [1.151 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2023-WEPWB109  
About • Received ※ 16 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 27 June 2023 — Issue date ※ 18 July 2023
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WEPWB133 Testing of the 2.6 GHz SRF Cavity Tuner for the Dark Photon Experiment at 2 K 907
 
  • C. Contreras-Martinez, B. Giaccone, I.V. Gonin, T.N. Khabiboulline, O.S. Melnychuk, Y.M. Pischalnikov, S. Posen, O.V. Pronitchev, J.C. Yun
    Fermilab, Batavia, Illinois, USA
 
  At FNAL two 2.6 GHz SRF cav­i­ties are being used to search for dark pho­tons, the ex­per­i­ment can be con­ducted at 2 K or in a di­lu­tion re­frig­er­a­tor. Pre­cise fre­quency tun­ing is re­quired for these two cav­i­ties so they can be matched in fre­quency. A cool­ing ca­pac­ity con­straint on the di­lu­tion re­frig­er­a­tor only al­lows piezo ac­tu­a­tors to be part of the de­sign of the 2.6 GHz cav­ity tuner. The tuner is equipped with three en­cap­su­lated piezo that de­liver the long- and short-range fre­quency tun­ing. Mod­i­fi­ca­tions were im­ple­mented on the first tuner de­sign due to the low forces on the piezos due to the cav­ity. Three brass rods with Belleville wash­ers were added to the de­sign to in­crease the over­all force on the piezos. The re­sults at 2 K of test­ing this tuner with and with­out the mod­i­fi­ca­tion will be pre­sented.  
poster icon Poster WEPWB133 [0.829 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2023-WEPWB133  
About • Received ※ 16 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 28 June 2023 — Issue date ※ 04 July 2023
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WEPWB134 Study of Different Piezoelectric Material Stroke Displacement at Different Temperatures Using an SRF Cavity 911
 
  • C. Contreras-Martinez, Y.M. Pischalnikov, J.C. Yun
    Fermilab, Batavia, Illinois, USA
 
  Piezo­elec­tric ac­tu­a­tors are used for res­o­nance con­trol in su­per­con­duct­ing linacs. The level of fre­quency com­pen­sa­tion de­pends on the piezo­elec­tric stroke dis­place­ment. In this study, the stroke dis­place­ment will be mea­sured with a 1.3 GHz SRF cav­ity by mea­sur­ing the fre­quency shift with re­spect to the volt­age ap­plied. The en­tire sys­tem was sub­merged in liq­uid he­lium. This study char­ac­ter­izes the PZT piezo­elec­tric ac­tu­a­tor (P-844K093) and a lithium nio­bate (P-844B0005) piezo­elec­tric ac­tu­a­tor. All these ac­tu­a­tors were de­vel­oped at Physik In­stru­mente (PI). The piezo-elec­tric dis­place­ment was mea­sured at dif­fer­ent tem­per­a­tures.  
poster icon Poster WEPWB134 [0.776 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2023-WEPWB134  
About • Received ※ 16 June 2023 — Revised ※ 24 June 2023 — Accepted ※ 27 June 2023 — Issue date ※ 13 July 2023
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WEPWB137 Prototype SSR2 Tuner Procurement and Testing at IJCLab for PIP-II Project 917
 
  • N. Gandolfo, P. Duchesne, D. Le Dréan, D. Longuevergne, G. Mavilla, T. Pépin-Donat
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  • M. Parise, D. Passarelli, Y.M. Pischalnikov
    Fermilab, Batavia, Illinois, USA
 
  Funding: Work supported by IN2P3. Work supported, in part, by the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under U.S. DOE Contract No. DE-AC02-07CH11359.
IJ­CLab is in­volved in the PIP-II pro­ject on the de­sign and de­vel­op­ment of ac­cel­er­a­tor com­po­nents for the SSR2 (Sin­gle Spoke Res­onator type 2) sec­tion of the su­per­con­duct­ing linac. Five pro­to­type tuners have been built and are being tested at IJ­CLab. After a short de­scrip­tion of the tuner, this paper re­ports on the pro­cure­ment strat­egy and the per­for­mance ob­served at both room and low tem­per­a­tures in ver­ti­cal cryo­stat test with SSR2 pro­to­type cav­i­ties. This paper will also share re­sults on ac­cel­er­ated life­time tests per­formed in a ded­i­cated ni­tro­gen-cooled cryo­stat.
 
poster icon Poster WEPWB137 [1.395 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2023-WEPWB137  
About • Received ※ 19 June 2023 — Revised ※ 25 June 2023 — Accepted ※ 29 June 2023 — Issue date ※ 16 July 2023
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FRIBA01
SRF R&D for FRIB Linac Energy Upgrade with High-performance Medium-beta Elliptical Cavity CW Cryomodules  
 
  • S.H. Kim, W. Chang, K. Elliott, W. Hartung, K.E. McGee, E.S. Metzgar, P.N. Ostroumov, L. Popielarski, J. Rathke, T. Xu, S. Zhao
    FRIB, East Lansing, Michigan, USA
  • D.J. Bice, C. Contreras-Martinez, G.V. Eremeev, Y.M. Pischalnikov
    Fermilab, Batavia, Illinois, USA
  • B.M. Guilfoyle, M.P. Kelly, T. Reid
    ANL, Lemont, Illinois, USA
 
  Funding: Work supported by the U.S. Department of Energy under Award Number DE-SC0000661. Further support provided by the US Department of Energy under Cooperative Agreement award number DE-SC0018362.
Michi­gan State Uni­ver­sity is pur­su­ing SRF R&D for FRIB400 up­grade, dou­bling the FRIB linac beam en­ergy (400 MeV/u for the heav­i­est ura­nium beam) using ßopt=0.65 644 MHz 5-cell el­lip­ti­cal cav­i­ties. We have achieved un­prece­dented Q₀ in this cav­ity class, Q₀ = 3.5·1010 at Eacc of 17.5 MV/m in a ni­tro­gen-doped bare nio­bium cav­ity in col­lab­o­ra­tion with FNAL and ANL. The next mis­sions are achiev­ing such high Q₀ in jack­eted cav­i­ties and in cry­omod­ules, achiev­ing field-emis­sion free per­for­mance at Epeak of 40 MV/m with re­pro­ducibil­ity, de­vel­op­ing a com­pact two-win­dow high-power fun­da­men­tal power cou­pler (15 kW CW), and achiev­ing sta­ble res­o­nance con­trol of cav­i­ties in­te­grated with tuners in cry­omod­ules. In this talk, we will pre­sent progress of the SRF R&D and dis­cuss fu­ture plan.
 
slides icon Slides FRIBA01 [2.513 MB]  
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