Rf, thermal and structural analysis of the 57.5 MHz CW RFQ for the RIA driver linac.

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The RFQ design for the Rare Isotope Accelerator (RIA) driver operates at 57.5 MHz, room temperature and is CW, Continuous Wave. This device is capable of accelerating a variety of masses as well as simultaneously accelerating multiple charge states. Therefore, the structure must operate over a wide range of RF power dissipation, from less than 1kW to about 48 kW. The physics design was developed by ANL and the preliminary engineering design by AES. Some of its principal design requirements include efficient cooling of components, mechanical stability, precise alignment and fine tuning of the resonant frequency during operation. This paper ... continued below

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3 pages

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Schultheiss, T. J.; Rathke, J. W.; Ostroumov, P. N. & Kolomiets, A. A. September 17, 2002.

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Description

The RFQ design for the Rare Isotope Accelerator (RIA) driver operates at 57.5 MHz, room temperature and is CW, Continuous Wave. This device is capable of accelerating a variety of masses as well as simultaneously accelerating multiple charge states. Therefore, the structure must operate over a wide range of RF power dissipation, from less than 1kW to about 48 kW. The physics design was developed by ANL and the preliminary engineering design by AES. Some of its principal design requirements include efficient cooling of components, mechanical stability, precise alignment and fine tuning of the resonant frequency during operation. This paper discusses RF, thermal and structural analyses that have been completed in response to these requirements. RF analysis was used to determine the heat loss distribution on the cavity surfaces. The heat loads were then transferred to a thermal model of a single segment and scaled to match total heat loss obtained from the code CST Microwave Studio. The thermal model includes the cavity vanes, walls and all coolant channels. To determine the coolant temperature rise, one-dimensional pipe flow elements were used. These elements account for fluid heat transport and heat transfer coefficients. The model was then used to minimize coolant flow by connecting the shell coolant channels in series. Temperature distributions were used as input to the structural model to determine stress levels and vane displacements. Different power levels were assessed, as well as, the thermal and structural response to vane-shell coolant temperature differences which may be used to tune the resonant frequency. Results of these analyses show that the thermal and structural design of this RFQ is very robust.

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3 pages

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  • 21st International Linear Accelerator Conference (LINAC 2002)., Gyeongju (KR), 08/19/2002--08/23/2002

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  • Report No.: ANL/PHY/CP-107621
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 801604
  • Archival Resource Key: ark:/67531/metadc742530

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  • September 17, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • March 28, 2016, 8:55 p.m.

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Schultheiss, T. J.; Rathke, J. W.; Ostroumov, P. N. & Kolomiets, A. A. Rf, thermal and structural analysis of the 57.5 MHz CW RFQ for the RIA driver linac., article, September 17, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc742530/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.