An Experimental Second-Harmonic Axis-Encircling Beam Gyro-TWT
Despite the bright potential as a broad band source for future radar and communication applications, the area of harmonic gyro-TWTs with axis-encircling beams has been relatively unexplored. A second-harmonic TE21 gyro-TWT has been constructed at UCD that is predicted to produce 50 kW in Ka-band with 20% efficiency, 30 dB saturated gain and 3% bandwidth and is ready for hot testing. The device is driven by an axis-encircling electron beam from a novel Northrop Grumman cusp gun.
Cusp gun TE/sub 21/ second-harmonic Ka-band gyro-TWT amplifier
A second-harmonic TE/sub 21/ gyrotron traveling-wave tube (gyro-TWT) amplifier with an axis-encircling electron beam is being constructed at the University of California-Davis that is predicted to double the efficiency of our previous 200-kW 12%-efficient magnetron injection gun (MIG) TE/sub 21//sup (2)/ gyro-TWT. Both devices employ a sliced mode-selective circuit to suppress the odd-order azimuthal modes. The new device will avoid the loss in efficiency that is due to off-axis electrons interacting with the resulting linearly polarized mode. The amplifier is predicted by our large signal code to produce 50 kW in Ka-band with 20% efficiency, 30 dB saturated gain, and 3% bandwidth. The 70-kV 3.5-A axis-encircling electron beam with /spl upsi//sub /spl perp////spl upsi//sub z/ = 1.2 and /spl Delta//spl upsi//sub z///spl upsi//sub z/ = 7% will be produced by a Cusp electron gun delivered by Northrop Grumman. The amplifier has been designed using linear theory to provide a 30% safety margin from absolute instability. Distributed loss is added to the first 30.5 cm of the circuit to ensure the device is stable to harmonic gyro-BWO. The last 11.5 cm of the circuit is standard copper to avoid attenuating the wave at high power levels.
Only the Third Heaven?: 2 Corinthians 12.1-10 and Heavenly Ascent
CHAPTER 1 General Introduction PART 1: Texts of Heavenly Ascent CHAPTER 2 Introduction: Heavenly Ascent Texts: A History of Scholarship CHAPTER 3 Jewish Apocalyptic Texts Pre-70 AD CHAPTER 4 Jewish Apocalyptic Texts Post-70 AD. CHAPTER 5 The New Testament CHAPTER 6 Post-Biblical Early Christian Apocalypses CHAPTER 7 The Nag Hammadi Codices CHAPTER 8 The Hekhalot Literature CHAPTER 9 Conclusions to Part One PART 2: 2 Corinthians 12:1-10 and Heavenly Ascent CHAPTER 10 2 Corinthians 12: 1-10 as a Heavenly Ascent CHAPTER 11 2 Corinthians 12.1-10 as a Subversion of the Heavenly Ascent CHAPTER 12 General Conclusions.