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Heat and Mass Transfer

, Volume 50, Issue 6, pp 827–833 | Cite as

Theoretical analysis for the transient behaviour of radiative cooling of cavities in superconducting LINAC cryomodule

  • T. S. Datta
  • Soumen KarEmail author
  • Jacob Chacko
  • Anup Choudhury
  • Joby Antony
  • Suresh Babu
  • Manoj Kumar
Original

Abstract

For the superconducting linear accelerator program, three cryomodules each houses eight superconducting cavities were successfully developed at IUAC, New Delhi. In each cryomodule, the cold mass at 4.2 K is surrounded by the liquid nitrogen cooled thermal shield maintained at 100 K. Three stages of cooling namely, radiation cooling followed by liquid nitrogen pre-cooling and finally liquid helium (LHe) cooling, are followed to reduce the temperature of cold mass from 300 to 4.2 K. The cold mass at 4.2 K consists of cavities, LHe vessel and the support structure. The temperature of cavity and helium vessel reaches to 210–220 K in 40 h of time by the natural radiation from the thermal shield. The radiative cooling rates for the cavities, helium vessel and support structure are found to be 3.0, 4.0 and 2.0 K/h respectively. A detailed analytical calculation has been done to understand the transient cool-down phenomenon for each component and compared with the experimental measured values. The experimental values are in agreement with the analytical data within 5 % variation considering the correction factor of radiation funneling. This paper presents the role of different thermal parameters like shield temperature, conduction load and radiation funneling area in the transient radiative cool-down behaviour of different components.

Keywords

Radiation Cool Thermal Shield Cold Mass Conduction Heat Flow Vacuum Jacket 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • T. S. Datta
    • 1
  • Soumen Kar
    • 1
    Email author
  • Jacob Chacko
    • 1
  • Anup Choudhury
    • 1
  • Joby Antony
    • 1
  • Suresh Babu
    • 1
  • Manoj Kumar
    • 1
  1. 1.Inter-University Accelerator CentreNew DelhiIndia

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