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To meet demands of DNP, sub-mm-wave radar and other THz frequency markets, CPI Canada continues the performance improvements of CW and pulsed compact EIKs. The novel model of a 266 GHz oscillator generates up to 15 W of CW power, while the expected power of a 264 GHz pulsed amplifier currently in fabrication is 50 W. Together with power enhancements, major attention is paid to reliability, lifetime...
A new model of vacuum tube amplifier, designed to produce over 10 Watts at 263 GHz is in development at CPI Canada. This device uses CPI's Extended Interaction Klystron technology, which has previously demonstrated good results from 17 to 220 GHz. With recent completion of a 264 GHz CW tunable oscillator, the amplifier development will extend the demonstrated envelope for EIKs to a frequency and power...
A novel model of the compact high power 264 GHz CW Extended Interaction Oscillator has been developed by CPI Canada. By combination of mechanical tuning and electronic switching between two operating modes, this EIO provides over 1 W of power in the range of 258 to 270 GHz. Liquid cooling is used to stabilize RF circuit temperature and prevent frequency detuning. Further development is ongoing to...
The development of new terahertz power amplifiers at 0.67, 0.85 and 1.03 THz presents significant challenges in both design and fabrication. This paper describes the design challenges and methodology, an outline design of the new device and an analysis of fabrication techniques considered.
The large-signal code TESLA (Telegraphist's Equations Solution for Linear beam Amplifiers) was originally developed for the analysis and design of klystrons. It has now been applied to the simulation of an extended interaction klystron (EIK) for the first time. Results for the power transfer curve and bandwidth curves computed for a G-band EIK compare well to their measured values. TESLA obtains these...
This paper reviews the technology and demonstrated capability of millimeter wave Extended Interaction Klystrons for the use in wide range of radar systems. It discusses design and manufacturing concepts stating self-imposed restrictions and design modifications enhancing RF performance, lifetime, reliability and extending operating frequency into the THz region. Presented data are supported using...
This paper describes the dispenser cathode technology and cathode life testing at high current density that together underpin the design of a W-band 2 kW Extended Interaction Klystron developed for the nadir-pointing 94 Ghz radar of the CloudSat Earth Observation satellite. The cathode operates at an emission current density of 11.3 Amps/cm2 and, prior to launch, a 99% confidence level of meeting...
EarthCARE (Earth Clouds, Aerosols and Radiation Explorer) is the 6th Earth Explorer Core Mission of the European Space Agency and a joint undertaking with the Japan Aerospace Exploration Agency (JAXA). It will study and analyze the interaction and impact of clouds and aerosols on the Earth's radiative budget. Along with other instruments, the satellite payload will include a 94 GHz Cloud Profiling...
The EIKs described have demonstrated capability to provide mmW power suitable for improved ESR and NMR systems. The performance of EIKs at 94 GHz and 220 GHz is reviewed and possibilities for future improvement in performance, including increasing frequency, will be discussed. Presented data are supported by information provided by various academic and industrial customers.
This presentation describes the performance of a recently developed 218 GHz extended interaction klystron (EIK) amplifier producing 7W CW and weighing less than 4.3 kg.
The extended interaction klystron is one of the few readily available devices, capable of providing the required performance. This presentation describes the extended interaction klystron technology and presents improvements and design modifications in order to enhance power capability, bandwidth and to extend the operating frequency to the sub-millimeter region. A ladder-type RF circuit supports...
This paper presents on-orbit performance of the CloudSat extended interaction klystron (EIK) and reviews requirements, design and performance of EIK's for future space missions. The CloudSat mission provides cross-sectional view of clouds with information on their thickness, altitude, optical properties, water and ice content. It is concluded that following successful development and on-orbit operation...
This paper reviews the demonstrated capability of mmW and Sub-mmW extended interaction klystrons at CPI Canada. It discusses design and manufacturing concepts including self-imposed restrictions followed by performance expectations into the THz region.
This presentation describes the extended interaction klystron technology and presents improvements and design modifications in order to extend operational frequency into the sub-millimeter region
CPI Canada is developing a new-line of pulsed Ka-band amplifiers, featuring ultra-compact size, higher power, improved efficiency, conduction cooling and space-grade reliability. The major goal of the development is to address the needs of several current and future space missions. Space-borne Ka-band radars are proposed for precision measurements of global precipitation, water surface elevation and...
For over 30 years, CPI Canada has been designing and manufacturing extended interaction klystrons (EIK). In this time, the state of the art has been advanced significantly, to the point where the Ka-band EIK has been chosen for the uplink amplifiers for several systems. Since it's introduction, several development programs have enhanced the performance and therefore the value of this product. These...
We investigate a flow of particles moving along a tube together with gas. The dynamics of particles is determined by a stochastic differential equation with different initial states. The walls of the tube absorb particles. We prove that if the incoming flow of particles is determined by a random Poisson measure, then the number of remained particles is characterized by the Poisson distribution. The...
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