Author: Kostin, R.A.
Paper Title Page
MOPA46 Cryogenic Dielectric Structure with GΩ/m Level Shunt Impedance 157
  • R.A. Kostin, C. Jing
    Euclid Beamlabs, Bolingbrook, USA
  Shunt impedance is one of the most important parameters characterizing particle acceleration efficiency. It is known that RF losses are reduced at cryogenic temperatures. For example, a record high shunt impedance of 350 MΩ/m was demonstrated recently for all metal X-band accelerating structure, which is more than 2 times higher than that at room temperature. In this article we present a novel hybrid dielectric structure which can achieve even higher shunt impedance due to the fact that losses in dielectric materials reduced much more than in pure copper.  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-MOPA46  
About • Received ※ 12 August 2022 — Revised ※ 16 August 2022 — Accepted ※ 23 August 2022 — Issue date ※ 17 September 2022
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WEZE4 First High-Gradient Results of UED/UEM SRF Gun at Cryogenic Temperatures 607
  • R.A. Kostin, C. Jing
    Euclid Beamlabs, Bolingbrook, USA
  • D.J. Bice, T.N. Khabiboulline, S. Posen
    Fermilab, Batavia, Illinois, USA
  Funding: The project is funded by DOE SBIR #DE-SC0018621
Benefiting from the rapid progress on RF photogun technologies in the past two decades, the development of MeV range ultrafast electron diffraction/microscopy (UED and UEM) has been identified as an enabling instrumentation. UEM or UED use low power electron beams with modest energies of a few MeV to study ultrafast phenomena in a variety of novel and exotic materials. SRF photoguns become a promising candidate to produce highly stable electrons for UEM/UED applications because of the ultrahigh shot-to-shot stability compared to room temperature RF photoguns. SRF technology was prohibitively expensive for industrial use until two recent advancements: Nb3Sn and conduction cooling. The use of Nb3Sn allows to operate SRF cavities at higher temperatures (4K) with low power dissipation which is within the reach of commercially available closed-cycle cryocoolers. Euclid is developing a continuous wave (CW), 1.5-cell, MeV-scale SRF conduction cooled photogun operating at 1.3 GHz. In this paper, we present first high gradient results of the gun conducted in liquid helium.
slides icon Slides WEZE4 [2.817 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEZE4  
About • Received ※ 05 August 2022 — Revised ※ 07 August 2022 — Accepted ※ 11 August 2022 — Issue date ※ 29 September 2022
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WEPA52 Demonstration of Twice-Reduced Lorentz-Force Detuning in SRF Cavity by Copper Cold Spraying 749
  • R.A. Kostin, C.-J. Jing, A. Kanareykin
    Euclid TechLabs, Solon, Ohio, USA
  • G. Ciovati
    JLab, Newport News, Virginia, USA
  Funding: The project is funded by DOE SBIR # DE-SC0019589
Superconducting RF (SRF) cavities usually are made from thin-walled high RRR Niobium and are susceptible to Lorentz Force Detuning (LFD) ’ cavity deformation phenomena by RF fields. In this paper, we present high gradient cryogenic results of an SRF cavity with two times reduced LFD achieved by copper cold spray reinforcement without sacrificing cavity flexibility for tuning. Finite-element model was developed first to find the best geometry for LFD reduction, which incorporated coupled RF, structural and thermal modules, and is also presented.
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEPA52  
About • Received ※ 27 July 2022 — Revised ※ 03 August 2022 — Accepted ※ 09 August 2022 — Issue date ※ 16 August 2022
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THYE4 Development of an Ultra-Low Vibration Cryostat Based on a Closed-Cycle Cryocooler 874
  • R.W. Roca
    Illinois Institute of Technology, Chicago, Illinois, USA
  • E.W. Knight, R.A. Kostin, Y. Zhao
    Euclid TechLabs, Solon, Ohio, USA
  Low temperature and low vibration cryostats are useful in a variety of applications such as x-ray diffraction, quantum computing, x-ray monochromators and cryo-TEMs. In this project, we explore an ultra-low vibration cryostat with the cooling provided by a closed cycle cryocooler. Closed-cycle cryocoolers inevitably introduce vibrations into the system, and in this project, flexible copper braiding was used to decouple vibrations and provide cooling at the same time. In order to develop the cryostat, capacity map of a two stage Sumitomo cryocooler was measured as well as vibration transmission through different copper braids using an IR interferometer. This paper covers the capacity map and vibration measurements in the first prototype.  
slides icon Slides THYE4 [4.989 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-THYE4  
About • Received ※ 16 July 2022 — Revised ※ 10 August 2022 — Accepted ※ 20 August 2022 — Issue date ※ 12 September 2022
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