Author: Rogind, D.
Paper Title Page
MOMAU008 Integrated Management Tool for Controls Software Problems, Requests and Project Tasking at SLAC 59
  • D. Rogind, W. Allen, W.S. Colocho, G. DeContreras, J.B. Gordon, P. Pandey, H. Shoaee
    SLAC, Menlo Park, California, USA
  The Controls Department at SLAC, with its service center model, continuously receives engineering requests to design, build and support controls for accelerator systems lab-wide. Each customer request can vary in complexity from installing a minor feature to enhancing a major subsystem. Departmental accelerator improvement projects, along with DOE-approved construction projects, also contribute heavily to the work load. These various customer requests and projects, paired with the ongoing operational maintenance and problem reports, place a demand on the department that usually exceeds the capacity of available resources. An integrated, centralized repository - comprised of all problems, requests, and project tasks - available to all customers, operators, managers, and engineers alike - is essential to capture, communicate, prioritize, assign, schedule, track progress, and finally, commission all work components. The Controls software group has recently integrated its request/task management into its online problem tracking "Comprehensive Accelerator Tool for Enhancing Reliability" (CATER ) tool. This paper discusses the new integrated software problem/request/task management tool - its work-flow, reporting capability, and its many benefits.  
slides icon Slides MOMAU008 [0.083 MB]  
poster icon Poster MOMAU008 [1.444 MB]  
WEPMN032 Development of Pattern Awareness Unit (PAU) for the LCLS Beam Based Fast Feedback System 954
  • K.H. Kim, S. Allison, D. Fairley, T.M. Himel, P. Krejcik, D. Rogind, E. Williams
    SLAC, Menlo Park, California, USA
  LCLS is now successfully operating at its design beam repetition rate of 120 Hz, but in order to ensure stable beam operation at this high rate we have developed a new timing pattern aware EPICS controller for beam line actuators. Actuators that are capable of responding at 120 Hz are controlled by the new Pattern Aware Unit (PAU) as part of the beam-based feedback system. The beam at the LCLS is synchronized to the 60 Hz AC power line phase and is subject to electrical noise which differs according to which of the six possible AC phases is chosen from the 3-phase site power line. Beam operation at 120 Hz interleaves two of these 60 Hz phases and the feedback must be able to apply independent corrections to the beam pulse according to which of the 60 Hz timing patterns the pulse is synchronized to. The PAU works together with the LCLS Event Timing system which broadcasts a timing pattern that uniquely identifies each pulse when it is measured and allows the feedback correction to be applied to subsequent pulses belonging to the same timing pattern, or time slot, as it is referred to at SLAC. At 120 Hz operation this effectively provides us with two independent, but interleaved feedback loops. Other beam programs at the SLAC facility such as LCLS-II and FACET will be pulsed on other time slots and the PAUs in those systems will respond to their appropriate timing patterns. This paper describes the details of the PAU development: real-time requirements and achievement, scalability, and consistency. The operational results will also be described.  
poster icon Poster WEPMN032 [0.430 MB]  
FRBHAULT03 Beam-based Feedback for the Linac Coherent Light Source 1310
  • D. Fairley, K.H. Kim, K. Luchini, P. Natampalli, L. Piccoli, D. Rogind, T. Straumann
    SLAC, Menlo Park, California, USA
  Funding: Work supported by the U. S. Department of Energy Contract DE-AC02-76SF00515
Beam-based feedback control loops are required by the Linac Coherent Light Source (LCLS) program in order to provide fast, single-pulse stabilization of beam parameters. Eight transverse feedback loops, a 6x6 longitudinal feedback loop, and a loop to maintain the electron bunch charge were successfully commissioned for the LCLS, and have been maintaining stability of the LCLS electron beam at beam rates up to 120Hz. In order to run the feedback loops at beam rate, the feedback loops were implemented in EPICS IOCs with a dedicated ethernet multicast network. This paper will discuss the design, configuration and commissioning of the beam-based Fast Feedback System for LCLS. Topics include algorithms for 120Hz feedback, multicast network performance, actuator and sensor performance for single-pulse control and sensor readback, and feedback configuration and runtime control.
slides icon Slides FRBHAULT03 [1.918 MB]