Performance evaluation of a klystron beam focusing system with anisotropic ferrite magnet
Abstract
A klystron beam focusing system using permanent magnets, which increases reliability in comparison with an electromagnetic focusing system, is reported. A prototype model has been designed and fabricated for a 1.3 GHz, 800 kW klystron for evaluation of the feasibility of focusing systems with permanent magnets. In order to decrease the production cost and to mitigate the complex tuning processes of the magnetic field, an anisotropic ferrite magnet is adopted as the magnetic material. As the result of a power test, 798 ±8 kW peak output power was successfully achieved with the prototype focusing system. Considering the power consumption of an electromagnetic focusing system, the required wall-plug power to produce a nominal 800 kW output power with the permanent magnet system is less than that with an electromagnet. However, the power conversion efficiency of the klystron with the permanent magnet system was found to be limited by transverse multipole magnetic fields. By decreasing the transverse multipole magnetic field components, especially the dipole and the quadrupole, the power conversion efficiency would approach that with electromagnets.
- Publication:
-
Progress of Theoretical and Experimental Physics
- Pub Date:
- February 2017
- DOI:
- 10.1093/ptep/ptw190
- arXiv:
- arXiv:1610.02130
- Bibcode:
- 2017PTEP.2017b3G01F
- Keywords:
-
- Physics - Accelerator Physics;
- High Energy Physics - Experiment