Author: O’Hara, J.F.
Paper Title Page
MOYE4 Diagnoses and Repair of a Crack in the Drift Tube LINAC Accelerating Structure at LANSCE 19
 
  • W.C. Barkley, D.A. Bingham, M.J. Borden, J.A. Burkhart, D.J. Evans, J.T.M. Lyles, J.P. Montross, J.F. O’Hara, B.J. Roller, M. Sanchez Barrueta
    LANL, Los Alamos, New Mexico, USA
 
  Funding: Work supported by the United States Department of Energy, National Nuclear Security Agency, under contract DE-AC52-06NA25396
Many were per­plexed at the in­abil­ity of Mod­ule 3 at LAN­SCE to op­er­ate at peak power and duty fac­tor while run­ning pro­duc­tion beam. Dur­ing the 2018 pro­duc­tion run, the DTL began to in­ter­mit­tently break down, lead­ing to a se­ries of root cause in­ves­ti­ga­tions. These analy­ses in­cluded elim­i­nat­ing the usual sus­pects: vac­uum leak, de­bris in tank, dri­v­e­line win­dow, power cou­pler, etc. The throt­tling back of rep­e­ti­tion rate from 120 to 60 Hz al­lowed con­tin­ued pro­duc­tion with a di­min­ished beam, one that re­duced neu­tron flux to three ex­per­i­men­tal areas. Dur­ing the an­nual shut­down in 2019, a more thor­ough in­ves­ti­ga­tion in­volv­ing the use of x-ray de­tec­tion, high-res­o­lu­tion cam­eras and IR de­tec­tion through site glass win­dows was per­formed. After a tena­cious search, a 30 cm long crack was dis­cov­ered in a weld at one of the ion pump port grates. In­ac­ces­si­bil­ity for weld­ing from the out­side and in a con­fined space, non-in­tru­sive re­pairs were tried first but were un­suc­cess­ful. Ul­ti­mately, an ex­pert welder en­tered the tank to weld the crack under un­fa­mil­iar weld­ing con­di­tions. This paper de­scribes the di­ag­noses, non-in­tru­sive so­lu­tions and ul­ti­mate re­pair of the crack in the ac­cel­er­at­ing struc­ture.
 
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DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-MOYE4  
About • Received ※ 23 July 2022 — Revised ※ 04 August 2022 — Accepted ※ 05 August 2022 — Issue date ※ 13 September 2022
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