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Title: An efficient magnetron transmitter for superconducting accelerators

A concept of a highly-efficient high-power magnetron transmitter allowing wide-band phase and the mid-frequency power control at the frequency of the locking signal is proposed. The proposal is aimed for powering Superconducting RF (SRF) cavities of intensity-frontier accelerators. The transmitter is intended to operate with phase and amplitude control feedback loops allowing suppression of microphonics and beam loading in the SRF cavities. The concept utilizes injectionlocked magnetrons controlled in phase by the locking signal supplied by a feedback system. The injection-locking signal pre-excites the magnetron and allows its operation below the critical voltage. This realizes control of the magnetron power in a wide range by control of the magnetron current. Pre-excitation of the magnetron by the locking signal provides an output power range up to 10 dB. Experimental studies were carried out with 2.45 GHz, 1 kW, CW magnetrons. They demonstrated stable operation of the magnetrons and power control at a low noise level. In conclusion, an analysis of the kinetics of the drifting charge in the drift approximation substantiates the concept and the experimental results.
 [1] ;  [2] ;  [2] ;  [3]
  1. Muons, Inc., Batavia, IL (United States)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  3. Budker Institute of Nuclear Physics (BINP), Novosibirsk (Russia)
Publication Date:
Report Number(s):
Journal ID: ISSN 0168-9002; 1478949; TRN: US1700104
Grant/Contract Number:
AC02-07CH11359; De-AC02- 07CH11359
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 839; Journal Issue: C; Journal ID: ISSN 0168-9002
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
43 PARTICLE ACCELERATORS; magnetron; transmitter; superconducting accelerator; drift equation; pre-excited magnetron; threshold of self-excitation
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1430553