HOM Coupler Measurement and Simulation
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
Higher order mode (HOM) couplers have been widely used in superconducting cavities to absorb the HOM energy stimulated by the beam. However, overheating of the coupler becomes a concern when the beam current is strong. For example, the ERL project (Energy Recovery Linac) requires average current of 500 mA. To this end, it is interesting to know the current distribution at the HOM coupler. In this note, the procedure how to estimate the current on the HOM coupler is addressed. As first step, network analyzer measurements were made with the HOM coupler mounted on a coaxial cable test setup. PSpice was then applied on an equivalent circuit to simulate the measured results with the parameters adjusted in such a way as to get good agreement. Subsequently, the excitation field at the HOM coupler in the test setup was calculated and compared with the field on the beam pipe of a 5 cell cavity. Finally, the current magnitude on the coupler was defined in relation to the accelerating gradient.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 1061753
- Report Number(s):
- BNL--99312-2013-IR; C-A/AP/#161; KB0202011
- Country of Publication:
- United States
- Language:
- English
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