Mechanical features of the ATS RFQ linear accelerator

Conference · Sat Jan 01 00:00:00 EST 1983

DOI:https://doi.org/10.1109/TNS.1983.4336733· OSTI ID:6443308

Wilson, N G; Hayward, T D; Lind, G W

A radio-frequency quadrupole (RFQ) linear accelerator has been constructed and placed in operation on the Los Alamos National Laboratory accelerator test stand (ATS). This accelerator uses an evacuated rf manifold to distribute rf excitation from the 425-MHz rf power supply to the slot-coupled, RFQ vane-cavity, resonator assembly. The RFQ vanes are supported on commercially available copper-plated, linear, resilient C-seals to provide a high-conductivity rf contact that permits aligning and positioning the vanes during tuning, and demounting the vanes for evaluation and modification as necessary. All rf structures are fabricated from stress-relieved, bright-acid copper-plated carbon steel. Measurements made on the accelerator as assembled have demonstrated >8000 vane-cavity Q at the quadrupole's approx. 423.400-MHz accelerating-mode frequency. Operating manifold vacuum of 3 to 6 x 10/sup -8/ torr has been observed after rf conditioning; conditioning required 150 h for stable high-power rf operation. Experience to date has indicated the desirability of modifying the vane rf-contact seat configuration to improve assembly and alignment procedures, improving vane-machining processes to increase vane straightness, installing periodic vane-shorting rings to minimize the effect of dipole modes in the quadrupole accelerating structure,and modifying the waveguide-coupling slot in the manifold to improve forward rf power flow.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6443308
• Report Number(s): LA-UR-83-768; CONF-830311-52; ON: DE83009991
• Resource Relation: Journal Volume: 30; Journal Issue: 4; Conference: Particle accelerator conference, Santa Fe, NM, USA, 21 Mar 1983; Other Information: Portions are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
QUADRUPOLE LINACS
DESIGN
CAVITY RESONATORS
ELECTRIC CONTACTS
ELECTRODES
MECHANICAL STRUCTURES
RF SYSTEMS
SPECIFICATIONS
VACUUM SYSTEMS
ACCELERATORS
ELECTRICAL EQUIPMENT
ELECTRONIC EQUIPMENT
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430100* - Particle Accelerators- Design
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