Progress on the NBS-LANL CW microtron

Journal Article · Fri Apr 01 04:00:00 EST 1983 · IEEE Trans. Nucl. Sci.; (United States)

DOI:https://doi.org/10.1109/TNS.1983.4332540· OSTI ID:5901540

Debenham, P H; Ayres, R L; Cutler, R I; Lindstrom, E R; Mohr, P L; Penner, S; Rose, J E; Wilson, M A.P.

The NBS-LANL racetrack microtron (RTM) currently under construction at the National Bureau of Standards is a demonstration accelerator to determine the feasibility of, and to develop the technology necessary for building high-energy, high-current, continuous beam (CW) electron accelerators using beam recirculation through room temperature RF accelerating structures. Parameters of the RTM are: injection energy - 5 MeV; energy gain per pass - 12 MeV; number of passes - 15 or 16; final beam energy - 185-197 MeV; maximum current - 550 ..mu..A; rf frequency - 2380 MHz. At present, the electron gun and 100 keV beam transport line are operational, and most other major subsystems are in the construction or installation phase. Exceptions are the rf structure (under development), the 5 MeV beam transport line (in engineering design), and the extraction beam line (in conceptual design). Our studies of the original candidate accelerating structure, the disk-and-washer, have led to the discovery of beam steering modes which render this structure unsuitable for the RTM without at least substantial further development beyond the scope of the project. The most promising alternate for meeting the design goal of CW operation at 1.5 MeV/m is the side-coupled structure. A shunt impedance of 80 M..cap omega../m has been measured in a test section of side-coupled structure at 2380 MHz, adequate cooling has been designed, and a 2.7 m long section of this design is under construction. The electron optics of the RTM have been studied in detail. Compact end magnets have been designed to provide a magnetic field of the required uniformity (..delta..B/B less than or equal to 2x10/sup -4/), and are currently under construction. The RTM will be operated with a distributed control system which is currently functioning at the local control level. The schedule calls for completion of the accelerator in 1984, followed by a year of detailed beam studies.

• Research Organization: National Bureau of Standards, Washington, DC 20234
• OSTI ID: 5901540
• Journal Information: IEEE Trans. Nucl. Sci.; (United States), Journal Name: IEEE Trans. Nucl. Sci.; (United States) Vol. 30:2; ISSN IETNA
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430100* -- Particle Accelerators-- Design
Development
& Operation
ACCELERATORS
BEAM CURRENTS
BEAM FOCUSING MAGNETS
BEAM INJECTION
BEAMS
CONSTRUCTION
CONTROL
CURRENTS
CYCLIC ACCELERATORS
CYCLOTRONS
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ELECTRICAL EQUIPMENT
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MEV RANGE 01-10
MEV RANGE 10-100
MEV RANGE 100-1000
MICROTRONS
NATIONAL ORGANIZATIONS
PARTICLE BEAMS
SPECIFICATIONS
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US NBS
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