Stabilization of the microtron-injector for a wide-band compact FIR FEL
✍ Scribed by Grigori M Kazakevitch; Young Uk Jeong; Viatcheslav M Pavlov; Byung Cheol Lee
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 226 KB
- Volume
- 528
- Category
- Article
- ISSN
- 0168-9002
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✦ Synopsis
To provide parameters of a simple and inexpensive magnetron-driven microtron-injector acceptable for a wide-band FIR FEL, the microtron has been improved through stabilization of the beam current and the magnetron frequency. The beam current was stabilized during the macro-pulse by increasing the magnetron anode current. The pulse stabilization of the emission current makes possible the microtron operation with the maximal accelerated current, without risk of break-downs in the cavity and keeps the instability of the accelerated current at approximately 1% during long-time experiments. The magnetron frequency was stabilized using the microtron accelerating cavity as a stabilizing external resonator in a simple scheme that involved the cavity loading of the magnetron through a ferrite insulator. The scheme provides stabilization of the magnetron frequency with a coefficient of 3.5. The stabilization of current and the frequency at the microtron FIR FEL-injector provides satisfactory intrapulse stability of the extracted lasing power of 40-50 W in the FIR macro-pulse having duration of 3-4 ms and a long-time pulse-to-pulse instability of the FIR pulse energy in the range of p10%. Results of simulations of the stabilization based on the microtron operating parameters and measured results are presented and discussed.