The SNS High Energy Beam Transport Line

Technical Report · Sun Sep 20 04:00:00 EDT 1998

DOI:https://doi.org/10.2172/1157230· OSTI ID:1157230

Raparia, D. ^[1]; Alessi, J. ^[1]; Lee, Y. Y. ^[1]; Weng, W. T. ^[1]

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1. Brookhaven National Laboratory (BNL), Upton, NY (United States)

The 1 MW SNS machine consists of 1 GeV linac, an accumulator ring, and two transfer lines: (a) High Energy Beam Transfer line (HEBT), and (b) Ring to Target Beam Transfer line (RTBT). A key feature of this accelerator is the requirement for low uncontrolled beam losses (nA/m) to allow hands on maintenance. To achieve such low beam losses, the beam must be prepared very carefully before injecting in to the accumulator. The HEBT not only matches the beam into the accumulator, but also determines the beam quality before injection. To reduce the probability of uncontrolled beam losses, HEBT is equipped with nine sets of beam halo scrapers. The ratio of aperture to rms beam size is kept greater than 15. The maximum magnetic field in dipoles and quadrupoles is less than 3 kG to keep the H^- stripping losses low. Another key feature of this line ( to reduce the uncontrolled beam loss) is careful control of tolerances on elements. Figure 1 shows the HEBT. Table 1 gives the Twiss parameters at the entrance (middle of the last linac quadrupole) and exit (injection stripping foil) of the HEBT.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1157230
• Report Number(s): BNL--105621-2014-IR
• Country of Publication: United States
• Language: English

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