Multipass beam breakup in the CEBAF (Continuous Electron Beam Accelerator Facility) superconducting linac
Multipass beam breakup can severely limit current in superconducting linear accelerators due to the inherently high Q's of transverse deflecting modes of the rf cavities. The success of higher-order-mode damping in increasing threshold currents for the 4-pass CEBAF SRF linac design is investigated with computer modeling. This simulation is shown to be in agreement with theoretical analyses which have successfully described beam breakup in the Stanford superconducting, recirculating linac. Numerical evaluation of an analytic treatment by Gluckstern of multipass beam breakup with distributed cavities is also found to be consistent with the computer model. Application of the simulation to the design array of 400 five-cell CEBAF/Cornell cavities with measured higher-order-mode damping indicates that the beam breakup threshold current is at least an order of magnitude above the CEBAF design current of 200 ..mu..A.
- Research Organization:
- Continuous Electron Beam Accelerator Facility, Newport News, VA (USA)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 6152155
- Report Number(s):
- DOE/ER/40150-7; CEBAF-PR-86-001; CONF-860629-73; ON: DE87008678
- Country of Publication:
- United States
- Language:
- English
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