Research and development of superconducting linear accelerators for neutral particle beam applications
Abstract
Experiments with superconducting cavities designed for applications in continuous-wave, high-current ion linear accelerators have resulted in very high CW accelerating gradients, up to 18 MV/m, with only a few watts of power dissipation in the cavity walls. These results make the prospects for compact, lightweight Neutral Particle Beam accelerators very attractive, and they compel further work to develop RF superconductivity for this application. Accordingly, we have completed two designs of experiments for testing superconducting resonators with high-current ion beams. The first is the preliminary design of a superconducting linac section to be tested at the end of the Continuous-Wave Deuterium Demonstrator (CWDD), and the second is the conceptual design of a superconducting cavity test using the beam from Chalk River Nuclear Laboratory's RFQ-1250. In addition, a theoretical investigation of cumulative beam breakup has led to a classification of transient beam breakup in beams consisting of delta-function bunches, and the formalism was extended to include distributions of deflecting-mode frequencies in the accelerating structures. An analytic model of the transverse dynamics of space-charge-dominated beams in a continuous linear focusing channel was also formulated based on the Fokker-Planck equation and used in a first calculation of emittance growth and halo formation. In addition, a method for radio-frequency control of superconducting cavities with beam loading has been devised.
- Publication:
-
Presented at the Neutral Particle Beam Technical Symposium and Scientific Exchange
- Pub Date:
- 1992
- Bibcode:
- 1992npbt.conf.....D
- Keywords:
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- Cavity Resonators;
- Linear Accelerators;
- Neutral Particles;
- Particle Acceleration;
- Particle Beams;
- Superconducting Magnets;
- Fokker-Planck Equation;
- Ion Accelerators;
- Space Charge;
- Nuclear and High-Energy Physics