Simulation and Experimental Studies of a 2.45GHz Magnetron Source for an SRF Cavity with Field Amplitude and Phase Controls

Conference · Wed Jun 01 00:00:00 EDT 2016

DOI:https://doi.org/10.18429/JACoW-IPAC2016-MOPMY002· OSTI ID:1264154

Wang, Haipeng ^[1]; Plawski, Tomasz E. ^[1]; Rimmer, Robert A. ^[1]; Dudas, A. ^[2]; Neubauer, M. L. ^[2]

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1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
2. Muons Inc., Batavia, IL (United States)

Phase lock to an SRF cavity by using injection signal through output waveguide of a magnetron has been demonstrated [1, 3]. Amplitude control using magnetic field trimming and anode voltage modulation has been studied using MATLAB/Simulink simulations [2]. Based on these, we are planning to use an FPGA based digital LLRF system, which allows applying various types of control algorithms in order to achieve the required accelerating field stability. Since the 1497 MHz magnetron is still in the design stage, the proof of principle measurements of a commercial 2450 MHz magnetron are carried out to characterize the anode I-V curve, output power (the tube electronic efficiency), frequency dependence on the anode current (frequency pushing) and the Rieke diagram (frequency pulling by the reactive load). Based on early Simulink simulation, experimental data and extension of the Adler equation governing injection phase stability by Chen’s model, the specification of the new LLRF control chassis for both 2450 and 1497MHz systems are presented in this paper.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177; NP STTR Grant DE-SC0013203
• OSTI ID: 1264154
• Report Number(s): JLAB-ACC-16-2272; DOE/OR/23177-3818
• Resource Relation: Conference: IPAC'16, 08-13 May 2016. Busan, Korea
• Country of Publication: United States
• Language: English