Author: Jordan, K.
Paper Title Page
WE3AO05 Helium Mass Flow System Integrated into EPICS for Online SRF Cavity Q Measurements 1071
 
  • K. Jordan, G.R. Croke, J.P. Jayne, M.G. Tiefenback, C.M. Wilson
    JLab, Newport News, Virginia, USA
  • G.H. Biallas
    Hyperboloid LLC, Yorktown, Virginia, USA
  • D.P. Christian
    JLAB, Newport News, USA
 
  The SBIR funded He­lium Mass Flow Mon­i­tor Sys­tem, de­vel­oped by Jef­fer­son Lab and Hy­per­boloid LLC, is de­signed to mea­sure the health of cav­i­ties in a Cry­omod­ule in real-time. It ad­dresses the prob­lem of cav­i­ties with low Q₀, which gen­er­ate ex­cess heat and evap­o­ra­tion from the 2 K su­per-fluid he­lium bath used to cool the cav­i­ties. The sys­tem uti­lizes a unique meter that is based on a su­per­con­duct­ing com­po­nent. This de­vice en­ables high-res­o­lu­tion mea­sure­ments of the power dis­si­pated in the cry­omod­ule while the ac­cel­er­a­tor is op­er­at­ing. It can also mea­sure in­di­vid­ual Cav­ity Q₀s when the beam is turned off. The Linux-based con­trol sys­tem is an in­te­gral part of this de­vice, pro­vid­ing the nec­es­sary con­trol and data pro­cess­ing ca­pa­bil­i­ties. The ini­tial im­ple­men­ta­tion of the He­lium Mass Flow Mon­i­tor Sys­tem at Jef­fer­son Lab was done using Lab­View, a cou­ple of cur­rent sources & a nano-volt­meter. Once the de­vice was proven to work at 2K the con­trols tran­si­tioned to a hand wired PCB & Rasp­berry Pi in­ter­faced to the open-source Ex­per­i­men­tal Physics and In­dus­trial Con­trol Sys­tem (EPICS) con­trol sys­tem. The EE sup­port group pre­ferred to sup­port a Lab­Jack T7 over the rPi. 12 chas­sis were built and the sys­tem is being de­ployed as the cryo­genic U-Tubes be­come avail­able.  
slides icon Slides WE3AO05 [6.073 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-ICALEPCS2023-WE3AO05  
About • Received ※ 09 October 2023 — Revised ※ 12 October 2023 — Accepted ※ 14 December 2023 — Issued ※ 18 December 2023
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