|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.49 [2011] >
IJPAP Vol.49(11) [November 2011] >
| Title: | Accurate estimation of start oscillation current for maximum output power in 42 GHz, 200 kW gyrotron |
| Authors: | Khatun, Hasina
Rao, Reddy R
Sinha, A K
Joshi, Sri Niwas |
| Keywords: | Coupling coefficient
Effective interaction length
Diffractive quality factor
Start oscillation current |
| Issue Date: | Nov-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Design of a 42 GHz,
200 kW gyrotron operating at TE03 involves optimization of a guiding
magnetic field across the tapered cavity. The start oscillation current (SOC)
or starting current is one of the most important parameter to estimate the
guiding magnetic field to excite the desired operating mode irrespective of
large numbers of competitive modes. This paper presents an accurate method to estimate
SOC, based on the linear theory, yielding the guiding magnetic field at which
the maximum desired power level is also achieved through the beam-wave
interaction simulation using 3D MAGIC-PIC code. The method involves
interpretation of the beam wave interaction length as e-1 times of the normalized axial
Gaussian electric field profile. This method is successfully applied to low
order symmetric operating mode gyrotron. The minimum SOC from the linear theory
for the operating mode TE03 and the maximum power from the non-linear
theory/code are obtained at the same guiding magnetic field 1.607 T with an
error of 0.12% only. The paper also reports the effect of noise on SOC and
output power, simultaneously. |
| Page(s): | 776-781 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.49(11) [November 2011]
|
|
