THE CONTINUED DEVELOPMENT OF THE SNS EXTERNAL ANTENNA H- ION SOURCE

Conference · Fri Jan 01 04:00:00 EST 2010

OSTI ID:984766

Welton, Robert F ^[1]; Carmichael, Justin R ^[1]; Desai, Nandishkumar J ^[1]; Fuja, Raymond E ^[1]; Goulding, Richard Howell ^[1]; Han, Baoxi ^[1]; Kang, Yoon W ^[1]; Lee, Shyh-Yuan ^[1]; Murray, Jr, S N ^[1]; Pennisi, Terry R ^[1]; Potter, Kerry G ^[1]; Santana, Manuel ^[1]; Stockli, Martin P ^[1]

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1. ORNL

The U.S. Spallation Neutron Source (SNS) is an accelerator-based, pulsed neutron-scattering facility, currently in the process of ramping up neutron production. In order to insure that the SNS will meet operational commitments as well as provide for future facility upgrades with high reliability, we are developing an RF-driven, H- ion source based on a water-cooled, ceramic aluminum nitride (AlN) plasma chamber. To date, early versions of this source has delivered up to 42 mA to the SNS Front End (FE) and unanalyzed beam currents up to ~ 100mA (60Hz, 1ms) to the ion source test stand. This source was operated on the SNS accelerator from February to April 2009 and produced ~35mA (beam current required by the ramp up plan) with availability of ~97%. During this run several ion source failures identified reliability issues which must be addressed before the source re-enters routine operation: plasma ignition, antenna lifetime, magnet cooling and cooling jacket integrity. This report discusses these issues, details proposed engineering solutions and notes progress to date.

• Research Organization: Oak Ridge National Laboratory (ORNL); Spallation Neutron Source
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 984766
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ALUMINIUM
ANTENNAS
AVAILABILITY
BEAM CURRENTS
CERAMICS
IGNITION
ION SOURCES
Ion Source Plasma
LIFETIME
MAGNETS
NEUTRON SOURCES
NEUTRONS
NITRIDES
PRODUCTION
RELIABILITY
SPALLATION