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Title: INTEGRATING EXTERNALLY DEVELOPED SYSTEMS FOR SNS LINAC COOLING AND VACUUM

Abstract

No abstract prepared.

Authors:
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
788947
Report Number(s):
LA-UR-01-6173
TRN: US0200400
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Nov 2001
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; COOLING SYSTEMS; VACUUM SYSTEMS; LINEAR ACCELERATORS; SPALLATION; NEUTRON SOURCES; DESIGN

Citation Formats

P. S. MARROQUIN. INTEGRATING EXTERNALLY DEVELOPED SYSTEMS FOR SNS LINAC COOLING AND VACUUM. United States: N. p., 2001. Web.
P. S. MARROQUIN. INTEGRATING EXTERNALLY DEVELOPED SYSTEMS FOR SNS LINAC COOLING AND VACUUM. United States.
P. S. MARROQUIN. Thu . "INTEGRATING EXTERNALLY DEVELOPED SYSTEMS FOR SNS LINAC COOLING AND VACUUM". United States. doi:. https://www.osti.gov/servlets/purl/788947.
@article{osti_788947,
title = {INTEGRATING EXTERNALLY DEVELOPED SYSTEMS FOR SNS LINAC COOLING AND VACUUM},
author = {P. S. MARROQUIN},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Nov 01 00:00:00 EST 2001},
month = {Thu Nov 01 00:00:00 EST 2001}
}

Conference:
Other availability
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  • External contractors are developing the local cooling and vacuum control systems for the Spallation Neutron Source (SNS) linac. Soon these systems will be integrated into the facility-wide controls system. Allen-Bradley Logix5000 series programmable controllers, populated with appropriate input/output modules, were selected as the local controllers. These controllers will be interfaced to the facility-wide control system via VME systems with PowerPC processors running the Wind River VxWorks operating system and Experimental Physics and Industrial Control System (EPICS) front-end controller software. This paper describes the interface and integration issues driven by project, cooling system and vacuum system requirements and hardware selections.
  • The mechanical design of the vacuum pumping systems for SNS DTL (Drift Tube Linac) and CCL (Cavity Coupled Linac) linac systems is summarized. Both vacuum systems were modeled to select the optimal pump configuration. The pressure history in up to 182 sub-volumes was analyzed in detail. Included in the model are time-dependent outgassing rates and pressure-dependent pump speeds for a variety of gas species. With this information, we solved for the pressure history during roughing and with turbo and ion pumps. The number and size of each pump were optimized to achieve the desired pressure with minimal costs. In themore » optimized design, directly mounted ion pumps were provided for six DTL tanks. For four CCL modules (each in length of 12-15 m), ion pumps with manifolds were selected. With all metallic surface outgassing, seal leakage and expected gas loads from all diagnostic devices taken into account, the designed systems can provide operating drift-tube pressure below 1.8 x 10{sup -7} Torr and CCL beamline pressures below 9.2 x 10{sup -8} Torr even under abnormal conditions. Details of the design and the modeling results are presented.« less
  • The superconducting linac of the Spallation Neutron Source (SNS) has 23 cryomodules whose vacuum system is monitored and controlled by custom built hardware. The original control hardware was provided by Thomas Jefferson National Accelerator Facility (JLab) and contained a variety of custom boards utilizing integrated circuits to perform logic. The need for control logic changes, a desire to increase maintainability, and a desire to increase flexibility to adapt for the future has led to a Programmable Logic Controller (PLC) based upgrade. This paper provides an overview of the commercial off-the-shelf (COTS) hardware being used in the superconducting vacuum control system.more » Details of the design and challenges to convert a control system during small windows of maintenance periods without disrupting beam operation will be covered in this paper.« less
  • BNL is undertaking the design, construction and commissioning of the Spallation Neutron Source (SNS) accumulator ring and the beam transport lines [l]. Ultrahigh vacuum of 10{sup {minus}9} Torr is required in the accumulator ring to minimize beam-gas ionization, a contributing factor to the e-p instability observed in a few high-intensity proton storage rings. All vacuum instrumentation must be capable of local and remote operation to achieve a reliable vacuum system, especially in this extremely high intensity accelerator. The design and development of the SNS ring vacuum instrumentation and control through the Experimental Physics and Industrial Control System (EPICS) distributed real-timemore » software tools are presented.« less