Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprk16001w&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
Motivated by potential cost savings and the benefits of compactness, there is strong push worldwide for achieving ever-increasing accelerating gradients in superconducting cavities. However, in proton superconducting linacs, an increase in the accelerating gradient is accompanied by increase in the longitudinal focusing force. Stronger longitudinal focusing can be an advantage, but only as long as there is not an overfocusing that results in excitation of the longitudinal envelope instability, which can occur when the zero-current longitudinal phase advance per focusing period exceeds 90 degrees. This situation is primarily a concern at the low-velocity end of a high-gradient, superconducting rf linac. We discuss methods to address this potential beam-dynamics constraint on the accelerating gradient in low-velocity proton superconducting linacs.
Crandall Kenneth R.
Wangler Thomas P.
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