Development of a thermionic magnicon amplifier at 11.4 GHz. Technical progress report, 16 May 1994--31 December 1995 Page: 12 of 25
This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
Table 11. Total Radiated Power Calculation
16.0 0.5 dBm
+ 39.7 0.5 dB
+ 45.2 0.1 dB
- 3.7 3 dB
+ 2.5 0.25 dB
+ 1.0 0.2 dB
+ 0.7 0.2 dB
101.4 3 dBmPeak detected signals (Es)
Calibrated coax attenuation factor
Geometric area factor
Ratio of average to peak of antenna pattern
Power in Er Polarization
Calibrated pickup loss
Effective aperture correction
Total power (14 MW)Next, a scan of output power versus magnetic field was made with one pickup at the
angular maximum of the antenna pattern. The results are shown in Fig. 4, along with predictions
from simulations, as discussed below. The power is seen to peak experimentally at -8 MW in the
vicinity of 7.3 kG, and to vanish both below 6.5 kG and above 8.5 kG. The reason for the loss of
high power emission at lower magnetic fields is easily understood. It is observed that high power
emission only occurs when there is a large rf signal in the penultimate cavity. This large rf signal
becomes erratic below 7 kG, and vanishes completely (during the voltage flat-top) below 6.5 kG.
However, the loss of the magnicon signal at higher magnetic fields calls for a different explanation.
It is observed that the large penultimate cavity signal persists at all higher values of
magnetic field (through 11 kG), and should provide the required transverse beam momentum to
drive the output cavity interaction. In order to examine the predicted behavior of the output cavity
as a function of magnetic field, a set of time-dependent simulations of the output cavity were
carried out, assuming a constant value of a=0.5, and Osco=90, where 6scO is the scanning angle
spread [7]. (Scanning angle spread is defined as the instantaneous angular.extent of the guiding-9-
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Gold, S. H.; Fliflet, A. W. & Manheimer, W. M. Development of a thermionic magnicon amplifier at 11.4 GHz. Technical progress report, 16 May 1994--31 December 1995, report, December 31, 1995; United States. (https://digital.library.unt.edu/ark:/67531/metadc663879/m1/12/: accessed April 30, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.