Keyword: cryogenics
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MOPOB36 Design of the High Beta 650 MHz Cryomodule - PIP II ion, cavity, cryomodule, vacuum 149
  • V. Roger, T.H. Nicol, Y.O. Orlov
    Fermilab, Batavia, Illinois, USA
  Funding: US Department of Energy
In this paper the design of the high beta 650 MHz cryomodule will be presented. This cryomodule is composed of six 5-cell 650 MHz elliptical cavities, designed for β=0.92. These cryomodules are the last elements of the Super Conducting (SC) linac architecture which is the main component of the Proton Improvement Plan-II (PIP-II) at Fermilab. This paper summarizes the design choices which have been done. Mechanical, thermal and cryogenic analyses have been performed to ensure the proper operation. First the concept of having a strong-back at room temperature has been validated. Then the heat loads have been estimated and all the components have been integrated inside the cryomodule by designing the supports, the beam line, the thermal shield and the cryogenic lines. All these elements and the calculations leading to the design of this cryomodule will be described in this paper.
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WEPOB42 High Gradient S-Band Cryogenic Accelerating Structure for RF Breakdown Studies ion, cavity, coupling, experiment 991
  • A.D. Cahill, A. Fukasawa, J.B. Rosenzweig
    UCLA, Los Angeles, California, USA
  • G.B. Bowden, V.A. Dolgashev, S.G. Tantawi
    SLAC, Menlo Park, California, USA
  Funding: Work Supported by DOE/SU Contract DE-AC02-76-SF00515 and DOE SCGSR Fellowship
Operating accelerating gradient in normal conducting accelerating structures is often limited by rf breakdowns. The limit depends on multiple parameters, including input rf power, rf circuit, cavity shape, cavity temperature, and material. Experimental and theoretical study of the effects of these parameters on the breakdown physics is ongoing at SLAC. As of now, most of the data has been obtained at 11.4 GHz. We are extending this research to S-band. We have designed a single cell accelerating structure, based on the extensively tested X-band cavities. The setup uses matched TM01 mode launcher to feed rf power into the test cavity. Our ongoing study of the physics of rf breakdown in cryogenically X-band accelerating cavities shows improved breakdown performance. Therefore, this S-band experiment is designed to cool the cavity to cryogenic temperatures. We use operating frequencies near 2.856 GHz. We present the rf design and discuss the experimental setup.
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WEPOB47 Development of a Short Period Cryogenic Undulator at RadiaBeam ion, undulator, electron, simulation 995
  • F.H. O'Shea, R.B. Agustsson, Y.C. Chen, A.J. Palmowski, E. Spranza
    RadiaBeam, Santa Monica, California, USA
  Funding: Work supported by DOE under contracts DE-SC0006288 and NNSA SSAA DE-NA0001979.
RadiaBeam Technologies has developed a 7-mm period length cryogenic undulator prototype to test fabrications techniques in cryogenic undulator production. We present here our first prototype, the production techniques used to fabricate it, its magnetic performance at room temperature and the temperature uniformity after cool down.
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THA1CO05 Thermal Modeling and Cryogenic Design of a Helical Superconducting Undulator Cryostat ion, undulator, operation, radiation 1064
  • Y. Shiroyanagi, J.D. Fuerst, Q.B. Hasse, Y. Ivanyushenkov
    ANL, Argonne, Illinois, USA
  A conceptual design for a helical superconducting undulator (HSCU) for the Advanced Photon Source (APS) at Argonne National Laboratory (ANL) has been completed. The device differs sufficiently from the existing APS planar superconducting undulator (SCU) design to warrant development of a new cryostat based on value engineering and lessons learned from the existing planar SCU. Changes include optimization of the existing cryocooler-based refrigeration system and thermal shield as well as cost reduction through the use of standard vacuum hardware. The end result is a design that provides significantly larger 4.2 K refrigeration margin in a smaller package for greater installation flexibility in the APS storage ring. This paper presents ANSYS-based thermal analysis of the cryostat, including estimated static and dynamic (beam-induced) heating, and compares the new design with the existing planar SCU cryostat.
Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
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