Author: Browne, M.C.
Paper Title Page
MODPL06
 Recent and Future Upgrades to the Control Systems of LCLS and LCLS-II Scientific Instruments  
 
  • D.L. Flath, M.C. Browne, M.L. Gibbs, K. Gumerlock, B.L. Hill, A. Perazzo, M.V. Shankar, T.A. Wallace, D.H. Zhang
    SLAC, Menlo Park, California, USA
  
  Funding: LCLS is an Office of Science User Facility operated for the US Department of Energy Office of Science by Stanford University.
The Linac Co­her­ent Light Source (LCLS), a US De­part­ment of En­ergy Of­fice of Sci­ence user fa­cil­ity, achieved first light in 2009; a total of seven sci­en­tific in­stru­ments were com­mis­sioned through 2015. The EPICS-based con­trol sys­tem, in terms of both hard­ware and soft­ware has evolved sig­nif­i­cantly over eight years of op­er­a­tion as the rate of ex­per­i­ment de­liv­ery has in­creased through means such as pho­ton-beam mul­ti­plex­ing. A de­scrip­tion of the up­grades and im­prove­ments to hard­ware, soft­ware, tools, and pro­ce­dures will be pre­sented. Ad­di­tional dis­cus­sion points will focus on: (1) the pos­i­tive ef­fect of up­grades re­gard­ing re­duc­tion of staffing lev­els and re­quired skill-level re­quired to sup­port op­er­a­tions; (2) en­abling highly skilled staff to focus on fur­ther im­prove­ments; and (3) cur­rent and fu­ture up­grades re­quired to sup­port the LCLS-II which will fur­ther ex­pand ex­per­i­ment out­put when it achieves first light in 2020. LCLS-II top­ics in­clude re­quire­ments for au­toma­tion of rou­tine tasks such as x-ray and op­ti­cal-laser beam align­ment, and fo­cus­ing as well as im­prove­ments to user-in­ter­faces and user-ex­pe­ri­ence which will allow users and non-ex­pert staff to ex­e­cute ex­per­i­ments. 		 
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THPHA129 Automated Contols for the Hard X-Ray Split & Delay System at the Linac Coherent Light Source 1678
 
  • A.P. Rashed Ahmed, M.C. Browne, D.L. Flath, K. Gumerlock, T.K. Johnson, L. Lee, Z.L. Lentz, T.F. Rendahl, H.S. Shi, H.H. Slepicka, Y. Sun, T.A. Wallace, D. Zhu
    SLAC, Menlo Park, California, USA
  
  Funding: Work supported by the U.S. Department of Energy under contract number DE-AC02-76SF00515.
The hard x-ray split and delay (HXRSnD) sys­tem at the Lin­ear Co­her­ent Light Source (LCLS) was de­signed to allow for ex­per­i­ments re­quir­ing two-pulse based x-ray pho­ton cor­re­la­tion spec­troscopy. The sys­tem con­sists of eight sil­i­con crys­tals split be­tween two op­ti­cal branches, with over 30 de­grees of free­dom. To main­tain sys­tem sta­bil­ity and safety while eas­ing sys­tem op­er­a­tion, we ex­pand the LCLS Sky­walker soft­ware suite to pro­vide a python-based au­toma­tion scheme that han­dles align­ment, op­er­a­tions and en­gi­neer no­ti­fi­ca­tion. Core safety sys­tems such as col­li­sion avoid­ance are processed at the con­troller and Ex­per­i­men­tal Physics and In­dus­trial Con­trol Sys­tem (EPICS) layer. Higher level func­tion­al­ity is im­ple­mented using a stack of open-source python pack­ages (ophyd, bluesky, tran­si­tions) which pro­vide a com­pre­hen­sive and ro­bust op­er­a­tional en­vi­ron­ment con­sist­ing of vir­tual mo­tors, plans and fi­nite state ma­chines (FSM). 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ICALEPCS2017-THPHA129  
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