Results of the SNS front end commissioning at Berkeley Lab

Conference · Fri Aug 16 04:00:00 EDT 2002

OSTI ID:805140

Ratti, A ^[1]; Ayers, J J; Doolittle, L; Greer, J B; Keller, R; Lewis, S; Lionberger, C; Monroy, M; Pruyn, J; Staples, J W; Syversrude, D; Thomae, R; Virostek, S; Aleksandrov, A; Shea, T

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1. LBNL Library

The Front-End Systems (FES) for the Spallation Neutron Source (SNS) project comprise an rf-driven H{sup -} ion source, an electrostatic 2-lens LEBT, a 2.5 MeV RFQ, followed by a 14-quadrupole, 4-rebuncher MEBT including traveling-wave fast choppers. The nominal 2.5 MeV H{sup -} beam has a current of 38 mA at a repetition rate of 60 Hz and 1 ms pulse length, for a macro duty-factor of 6%, and is chopped at a rate of approximately 1 MHz with a mini duty-factor of 68%. The normalized rms beam emittance at the MEBT exit, matching the first tank of a 402.5 MHz Alvarez linac, is measured to be approximately 0.3 {pi} mm mrad. Diagnostic elements include wire scanners, BPMs, fast current monitors, a slit-harp emittance device and RFQ field monitoring probes. The results of the beam commissioning and the operation of the RFQ and diagnostic instrumentation are reported. The entire FES was shut down at LBNL at the end of May 2002 and will be recommissioned at ORNL prior to installation of the drift-tube linac.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director, Office of Science. Office of Basic Energy Studies (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 805140
• Report Number(s): LBNL--51411; B& R 820101000
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM EMITTANCE
COMMISSIONING
ELECTROSTATICS
ION SOURCES
LINEAR ACCELERATORS
MONITORING
MONITORS
NEUTRON SOURCES
PROBES
SNS SPALLATION NEUTRON SOURCE ION SOURCE FRONT-END COMMISSIONING
SPALLATION
TANKS