Author: Riemer, B.W.
Paper Title Page
TUPAB199 Progress on the Proton Power Upgrade at the Spallation Neutron Source 1876
 
  • M.S. Champion, C.N. Barbier, M.S. Connell, J. Galambos, M.P. Howell, S.-H. Kim, J.S. Moss, B.W. Riemer, K.S. White
    ORNL, Oak Ridge, Tennessee, USA
  • E. Daly
    JLab, Newport News, Virginia, USA
  • N.J. Evans, G.D. Johns
    ORNL RAD, Oak Ridge, Tennessee, USA
  
  Funding: ORNL is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy. This research was supported by the DOE Office of Science, Basic Energy Science.
The Pro­ton Power Up­grade Pro­ject at the Spal­la­tion Neu­tron Source (SNS) at Oak Ridge Na­tional Lab­o­ra­tory will dou­ble the pro­ton power ca­pa­bil­ity from 1.4 to 2.8 MW. This will be ac­com­plished through an en­ergy in­crease from 1.0 to 1.3 GeV and a beam cur­rent in­crease from 26 to 38 mA. The en­ergy in­crease will be ac­com­plished through the ad­di­tion of 7 cry­omod­ules to the lin­ear ac­cel­er­a­tor (Linac). The beam cur­rent in­crease will be sup­ported by up­grad­ing sev­eral ra­dio-fre­quency sys­tems in the nor­mal-con­duct­ing sec­tion of the Linac. Up­grades to the ac­cu­mu­la­tor ring in­jec­tion and ex­trac­tion re­gions will ac­com­mo­date the in­crease in beam en­ergy. A new 2-MW-ca­pa­ble tar­get and sup­port­ing sys­tems will be de­vel­oped and in­stalled. Con­ven­tional fa­cil­ity up­grades in­clude build-out of the ex­ist­ing kly­stron gallery and con­struc­tion of a tun­nel stub to fa­cil­i­tate fu­ture beam trans­port to the sec­ond tar­get sta­tion. The pro­ject re­ceived ap­proval to pro­ceed with con­struc­tion in Oc­to­ber 2020. Pro­cure­ments are in progress, and some in­stal­la­tion ac­tiv­i­ties have al­ready oc­curred. Most of the in­stal­la­tion will take place dur­ing three out­ages in 2022-2023. The pro­ject early fin­ish is planned for 2025. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB199  
About • paper received ※ 10 May 2021       paper accepted ※ 28 May 2021       issue date ※ 21 August 2021  
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WEPAB367 Bubble Generation in the SNS 2 MW Mercury Target 3567
 
  • C.N. Barbier, M.P. Costa, K.C. Johns, D. Ottinger, F. Rasheed, B.W. Riemer, R.L. Sangrey, J.R. Weinmeister, D.E. Winder
    ORNL, Oak Ridge, Tennessee, USA
  
  The ac­cel­er­a­tor at the Spal­la­tion Neu­tron Source is cur­rently being up­graded to in­crease the pro­ton beam power from 1.4 MW to 2.8 MW. About 2 MW will go to the first tar­get sta­tion, while the rest will go to the fu­ture sec­ond tar­get sta­tion. The first tar­get sta­tion uses a mer­cury tar­get. When the short pro­ton beam pulse hits it, strong pres­sure waves are de­vel­oped in­side the mer­cury and the ves­sel it­self, caus­ing weld fail­ures and cav­i­ta­tion ero­sion. The pres­sure wave can be sig­nif­i­cantly mit­i­gated by in­ject­ing small he­lium bub­bles into the mer­cury. SNS has been in­ject­ing he­lium since 2017 using small ori­fices but has met chal­lenges in fab­ri­ca­tion and op­er­a­tions with them. Thus, for the 2 MW tar­get, swirl bub­blers will be used to in­crease gas in­jec­tion and im­prove re­li­a­bil­ity. A 2 MW pro­to­typ­i­cal tar­get was built and tested in a mer­cury process loop avail­able at Oak Ridge Na­tional Lab­o­ra­tory. Acrylic view­ports on the top of the tar­get were used to de­ter­mine the bub­ble size dis­tri­b­u­tion (BSD) gen­er­ated by the swirl bub­blers. It was found that the bub­blers were not only ca­pa­ble of gen­er­at­ing small bub­bles but that the BSD was in­de­pen­dent of gas in­jec­tion rate.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB367  
About • paper received ※ 10 May 2021       paper accepted ※ 22 June 2021       issue date ※ 20 August 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)