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Overview

Overview. Exciter Receiver Oscillators High-Powered Amplifier Calibration. HPA: Extended Interaction Klystron. EIK-based amplifier appears to be the best suited Conduction cooled unit was developed for CloudSat

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Overview

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  1. Overview • Exciter • Receiver • Oscillators • High-Powered Amplifier • Calibration

  2. HPA: Extended Interaction Klystron • EIK-based amplifier appears to be the best suited • Conduction cooled unit was developed for CloudSat • Mounted in a pressure vessel in the pod with modulator and RF front-end electronics EIK Specifications CloudSat Flight Model EIK

  3. HPA: Extended Interaction Klystron

  4. HPA: Extended Interaction Klystron

  5. HPA: Modulator • Requirements • 5 % duty cycle • Up to 20 kHz pulse repetition rate • Pulse lengths from 200 ns to 2 µs • Aircraft ready (vibration, attitude changes) • Options • Communications & Power Industries (CPI) • Expensive modulator • Reports of bad experiences • Pulse Systems • Cheap • Largely untested • Applied Systems Engineering (ASE) • Very expensive • Good engineering support • Looking for advice and comments

  6. HPA: Waveguide • Peak Power Considerations • WR-10 can handle around 8 % (1.34 kW at 94 GHz) of the waveguide theoretical peak power (Ciavolella, 1972) • Pressurize the front-end electronics waveguide with nitrogen • Average Power Considerations • Maximum rated average power of WR-10 is 18 W at 94 GHz • At 1 µs pulse length and a 10 kHz PRF, the average power out of the EIK is 17 W assuming no standing waves in the waveguide • May need to use heat-sinks and forced-air cooling to remove heat from the waveguide walls

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