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Shea, T.J.

Paper Title Page
IT08 Diagnostic Challenges at SNS 35
 
  • M.A. Plum
    LANL, Los Alamos National Laboratory, Los Alamos, NM, USA
  • T.J. Shea, S. Assadi
    ORNL, Oak Ridge National Laboratory, Oak Ridge, TN, USA
  • L. Doolittle
    LBNL, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
  • P. Cameron, R. Connolly
    BNL, Brookhaven National Laboratory, Upton, NY, USA
 
  The Spallation Neutron Source now being built in Oak Ridge, Tennessee, USA, accelerates an H- ion beam to 1000 MeV with an average power of 1.4 MW. The H- beam is then stripped to H+, compressed in a storage ring to a pulse length of 695 ns, and then directed onto a mercury neutron spallation target. Most of the acceleration is accomplished with superconducting rf cavities. The presence of these cavities, the high average beam power, and the large range of beam intensity in the storage ring, provide unique challenges to the beam diagnostics systems. In this talk we will discuss these challenges and some of our solutions, including the laser profile monitor system, the residual gas ionization profile monitors, and network attached devices. Measurements performed using prototype instrumentation will also be presented.  
PM23 Networked Attached Devices at SNS 146
 
  • W. Blokland, T.J. Shea
    ORNL, Oak Ridge National Laboratory, Oak Ridge, TN, USA
  • M. Stettler
    LANL, Los Alamos National Laboratory, Los Alamos, NM, USA
 
  The Spallation Neutron Source (SNS) diagnostic instruments at Oak Ridge National Laboratory are based on the Network Attached Device (NAD) concept. Each pickup or sensor has its own resources such as timing, data acquisition and processing. NADs are individually connected to the network, thus reducing the brittleness inherent in tightly coupled systems. This architecture allows an individual device to fail or to be serviced or removed without disrupting other devices. This paper describes our implementation of the nearly 400 NADs to be deployed. The hardware consists of rack-mounted PCs with standard motherboards and PCI data-acquisition boards. The software environment is based on LabVIEW and EPICS. LabVIEW supports the agile development demanded by modern diagnostic systems. EPICS is the control system standard for the entire SNS facility. To achieve high performance, LabVIEW and EPICS communicate through shared memory. SNS diagnostics are developed by a multi-laboratory partnership including ORNL, BNL, LANL, and LBNL. The NAD concept proved successful during the commissioning of the SNS front-end both at LBNL and ORNL.