Abstract
Summary form only given, as follows. An intense-beam gyro-traveling-wave amplifier (gyro-TWA) experiment has been carried out at 35 GHz, using a 1-MeV, 200-A beam from the VEBA pulseline accelerator. The experiment was carried out in a 10.8-mm-diameter drift tube and used a 6-mm-diameter solid electron beam with low initial traverse momentum and very low initial parallel velocity spread. The electron transverse momentum required by the gyro-traveling-wave interaction (β⊥ approximately 0.3-0.4) was induced by transit through a one-period untapered bifilar helical wiggler magnet with a 4-cm period. A 35-GHz signal was launched in the TE11 mode using a directional sidewall coupler. A massive iron collar (6-1/4-cm diameter, 6-cm long) was placed around the 1.27-cm outer diameter of the stainless-steel drift tube as a means to exclude the applied axial magnetic field and thus to control and vary the axial extent of the interaction. In experiments operating at 8 kG, near grazing incidence between the dispersion relations of the beam and waveguide modes, the the gyro-TWA demonstrated linear growth rates of approximately 2 dB/cm, total gain exceeding 30 dB, and an output power of ≳20 MW.
Original language | English (US) |
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Number of pages | 1 |
State | Published - 1990 |
Externally published | Yes |
Event | 1990 IEEE International Conference on Plasma Science - Oakland, CA, USA Duration: May 21 1990 → May 23 1990 |
Conference
Conference | 1990 IEEE International Conference on Plasma Science |
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City | Oakland, CA, USA |
Period | 5/21/90 → 5/23/90 |
ASJC Scopus subject areas
- Engineering(all)