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IT08 |
Diagnostic Challenges at SNS
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35 |
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- 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
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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.
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PM23 |
Networked Attached Devices at SNS
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146 |
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- 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
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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.
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