An efficient magnetron transmitter for superconducting accelerators

Journal Article · Thu Sep 22 00:00:00 EDT 2016 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2016.09.044· OSTI ID:1329058

Kazakevich, G. ^[1]; Lebedev, V. ^[2]; Yakovlev, V. ^[2]; Pavlov, V. ^[3]

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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)

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.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: AC02-07CH11359; De-AC02- 07CH11359
• OSTI ID: 1329058
• Alternate ID(s): OSTI ID: 1430553
• Report Number(s): FERMILAB-PUB-15-647-AD-TD; 1478949; TRN: US1700104
• Journal Information: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 839, Issue C; ISSN 0168-9002
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
magnetron
transmitter
superconducting accelerator
drift equation
pre-excited magnetron
threshold of self-excitation