Access Restriction

Author Wilson, N. G. ♦ Hayward, T. D. ♦ Lind, W.
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Mechanical Feature ♦ At Rfq Linear Accelerator ♦ Rfq Vane ♦ Rf Structure ♦ 3-6 10-g Torr ♦ Rf Excitation ♦ Manifold Vacuum ♦ Radio-frequency Quadrupole ♦ Rfq Vane-cavity ♦ Rf Conditioning ♦ Periodic Vane-shorting Ring ♦ Resonator Assembly ♦ Alignment Procedure ♦ 400-mhz Accelerating-mode Frequency ♦ Bright-acid Copper-plated Carbon Steel ♦ Rf Power Flow ♦ Waveguide-coupling Slot ♦ Resili-ent C-seals ♦ High-conductivity Rf Con-tact ♦ Vane Rf-contact Seat Configuration ♦ 425-mhz Rf Power Supply ♦ Dipole Mode ♦ Stable High-power Rf Operation ♦ Evacuated Rf Manifold ♦ Quadrupole Accelerating Structure ♦ Vane-machining Process
Abstract A radio-frequency quadrupole (RFQ) linear accel-erator 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, resili-ent "C-seals " to provide a high-conductivity rf con-tact 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 quad-rupole's x423.400-MHz accelerating-mode frequency. Operating manifold vacuum of 3-6 x 10-G 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 straight-ness, installing periodic vane-shorting rings to mini-mize 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.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study