Improving vacuum performance in the warm linac of the Spallation Neutron Source

Stone, Christopher M.; Gerber, Neal; Price, Jeremy P.; Pelfrey, Jonathan D.; Johnson, Jonathan D.; Crawford, James Steven; Baker, Stan; Geng, Xiaosong; Williams, Derrick; Ocker, Katherine D.

doi:10.1116/1.5118352

Title: Improving vacuum performance in the warm linac of the Spallation Neutron Source

Full Record
Other Related Research

Abstract

The Spallation Neutron Source is an accelerator-based neutron source built and operated by the U.S. Department of Energy in Oak Ridge, Tennessee. With over 10 years of operation at 1 MW of power and above, shortcomings have been identified in the original vacuum pumping scheme for the drift tube and the coupled cavity linear accelerator sections. In this article, the vacuum performance for these systems is reviewed and the major areas of concern are discussed. The changes to the vacuum system are examined and the final design is described. Finally, the performance impact of these changes after a year of operation with the new vacuum system is presented.

Authors:

^[1]; Gerber, Neal ^[1]; Price, Jeremy P. ^[1]; Pelfrey, Jonathan D. ^[1]; Johnson, Jonathan D. ^[1]; Crawford, James Steven ^[1]; Baker, Stan ^[1]; Geng, Xiaosong ^[1]; Williams, Derrick ^[1]; Ocker, Katherine D. ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Walters State Community College, Morristown, TN (United States)

Publication Date:: Tue Oct 08 00:00:00 EDT 2019

Research Org.:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1570108

Alternate Identifier(s):: OSTI ID: 1569781

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Vacuum Science and Technology A

Additional Journal Information:: Journal Volume: 37; Journal Issue: 6; Journal ID: ISSN 0734-2101

Publisher:: American Vacuum Society

Country of Publication:: United States

Language:: English

Subject:: 47 OTHER INSTRUMENTATION

Citation Formats


                    Stone, Christopher M., Gerber, Neal, Price, Jeremy P., Pelfrey, Jonathan D., Johnson, Jonathan D., Crawford, James Steven, Baker, Stan, Geng, Xiaosong, Williams, Derrick, and Ocker, Katherine D. Improving vacuum performance in the warm linac of the Spallation Neutron Source.  United States: N. p., 2019. 
Web.  doi:10.1116/1.5118352.

Copy to clipboard


                    Stone, Christopher M., Gerber, Neal, Price, Jeremy P., Pelfrey, Jonathan D., Johnson, Jonathan D., Crawford, James Steven, Baker, Stan, Geng, Xiaosong, Williams, Derrick, & Ocker, Katherine D. Improving vacuum performance in the warm linac of the Spallation Neutron Source.  United States.  https://doi.org/10.1116/1.5118352

Copy to clipboard


                    Stone, Christopher M., Gerber, Neal, Price, Jeremy P., Pelfrey, Jonathan D., Johnson, Jonathan D., Crawford, James Steven, Baker, Stan, Geng, Xiaosong, Williams, Derrick, and Ocker, Katherine D. Tue .  
"Improving vacuum performance in the warm linac of the Spallation Neutron Source".  United States.  https://doi.org/10.1116/1.5118352.  https://www.osti.gov/servlets/purl/1570108.

Copy to clipboard


                    
@article{osti_1570108,

  title        = {Improving vacuum performance in the warm linac of the Spallation Neutron Source},

  author       = {Stone, Christopher M. and Gerber, Neal and Price, Jeremy P. and Pelfrey, Jonathan D. and Johnson, Jonathan D. and Crawford, James Steven and Baker, Stan and Geng, Xiaosong and Williams, Derrick and Ocker, Katherine D.},

  abstractNote = {The Spallation Neutron Source is an accelerator-based neutron source built and operated by the U.S. Department of Energy in Oak Ridge, Tennessee. With over 10 years of operation at 1 MW of power and above, shortcomings have been identified in the original vacuum pumping scheme for the drift tube and the coupled cavity linear accelerator sections. In this article, the vacuum performance for these systems is reviewed and the major areas of concern are discussed. The changes to the vacuum system are examined and the final design is described. Finally, the performance impact of these changes after a year of operation with the new vacuum system is presented.},

  doi          = {10.1116/1.5118352},

  journal      = {Journal of Vacuum Science and Technology A},

  number       = 6,

  volume       = 37,

  place        = {United States},

  year         = {Tue Oct 08 00:00:00 EDT 2019},

  month        = {Tue Oct 08 00:00:00 EDT 2019}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (DOE)

Publisher's Version of Record

https://doi.org/10.1116/1.5118352

Other availability

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar Records in DOE PAGES and OSTI.GOV collections:

Low-power RF tuning of the Spallation Neutron Source warm LINAC structures

Conference Deibele, C ; Billen, J H ; Young, L ; ...

The Spallation Neutron Source (SNS) is an accelerator-based neutron source being built at Oak Ridge National Laboratory. A conventional 402.5-MHz drift-tube linac (DTL) accelerates the H{sup -} beam from 2.5 to 86 MeV, followed by a 805-MHz coupled-cavity linac (CCL) to 186 MeV. Tuning the six DTL tanks involves adjusting post-coupler lengths and slug tuners to achieve the design resonant frequency and stabilized field distribution. A 2.5-MW klystron feeds RF power into a DTL through a ridge-loaded waveguide. The CCL consists of 4 RF modules operating in the {pi}/2 mode. Each module contains 96 accelerating cavities in 12 segments ofmore »« less
Full Text Available
The RF system for the National Spallation Neutron Source linac

Conference Tallerico, P ; Billen, J ; Jason, A

The National Spallation Neutron Source (NSNS) system has been proposed to dramatically improve the neutron capabilities for science applications in the US. The NSNS is a fast pulse neutron source that would consist of a 1000 MeV H-linac, an accumulator ring, a neutron target, and an experimental area. Although the NSNS is to be built at Oak Ridge, the design responsibility is delegated to five US national laboratories, and the Los Alamos National Laboratory is responsible for the linac portion of this machine, from the output of the radio frequency quadrupole (RFQ) accelerator, to the entrance to the accumulator ring.more »« less
Full Text Available
LOW LOSS DESIGN OF THE LINAC AND ACCUMULATOR RING FOR THE SPALLATION NEUTRON SOURCE.

Conference RAPARIA, D

The Spallation Neutron Source (SNS) is a second generation pulsed neutron source and is presently in the fourth year of a seven-year construction cycle at Oak Ridge National Laboratory. A collaboration of six national laboratories (ANL, BNL, LANL, LBNL, ORNL, TJNAF) is responsible for the design and construction of the various subsystems. The operation of the facility will begin in 2006 and deliver a 1.0 GeV, 1.4 MW proton beam with pulse length of 650 nanosecond at a repetition rate of 60 Hz, on a liquid mercury target. It consists of an RF volume H{sup -} source of 50 mAmore »« less
Full Text Available
The SNS linac high power RF system design, status, and results

Conference Rees, D E ; Bradley, III, J T ; Cummings, K A ; ...

The Spallation Neutron Source being built at the Oak Ridge National Lab in Tennessee requires a 1 GeV proton linac. Los Alamos has responsibility for the RF systems for the entire linac. The linac requires 3 distinct types of RF systems: 2.5-MW peak, 402.5 MHz, RF systems for the RFQ and DTL (7 systems total); 5-MW peak, 805 MHz systems for the CCL and the two energy corrector cavities (6 systems total); and 550-kW peak, 805 MHz systems for the superconducting sections (8 1 systems total). The design of the SNS Linac RF system was presented at the 2001 Particlemore »« less
https://doi.org/10.1109/PAC.2003.1289616

Full Text Available
Plans for a Collaboratively Developed Distributed Control System for the Spallation Neutron Source

Conference DeVan, W R ; Gurd, D P ; Hammonds, J ; ...

The Spallation Neutron Source (SNS) is an accelerator-based pulsed neutron source to be built in Oak Ridge, Tennessee. The facility has five major sections - a ''front end'' consisting of a 65 keV H{sup -} ion source followed by a 2.5 MeV RFQ; a 1 GeV linac; a storage ring; a 1MW spallation neutron target (upgradeable to 2 MW); the conventional facilities to support these machines and a suite of neutron scattering instruments to exploit them. These components will be designed and implemented by five collaborating institutions: Lawrence Berkeley National Laboratory (Front End), Los Alamos National Laboratory (Linac); Brookhaven Nationalmore »« less
Full Text Available

Similar Records