Albert Roitman

Practical Aspects of EIK Technology

Significant progress in modeling and manufacturing technologies open wide possibilities for performance improvements of millimeter-wave vacuum electron devices. However, many practical aspects should be considered to realize reliable long-life high-power sources. These are: thermal and RF stability, materials and assembly sensitivity to manufacturing, electrical stresses, cathode poisoning prevention, thermal beam effects, and many others. We address the full spectrum of design and manufacturing aspects while developing state-of-the-art extended interaction klystrons (EIKs). EIKs provide unprecedented RF performance and reliability in a compact user-friendly package. This paper discusses EIK design methodology and manufacturing concepts stating self-imposed restrictions and design modifications enhancing power capability, bandwidth, and extending operating frequencies into the terahertz region.

A compact, high power, sub-millimeter-wave Extended Interaction Klystron

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.

Extended Interaction Klystrons for Submillimeter Applications

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

9.2: Fabrication techniques for a THz EIK

To produce an EIK working at THz frequencies, departure from traditional fabrication techniques is required. This paper describes the investigation and results of various fabrication techniques and their suitability for application in a VED.

Advantages of the Extended Interaction klystron Technology at Millimeter and Sub-Millimeter Frequencies

This paper reviews the technology and demonstrated capability of mmW and Sub-mmW Extended Interaction Klystrons at CPI Canada. It discusses design and manufacturing concepts stating self-imposed restrictions and design modifications enhancing power capability, bandwidth and extending operating frequency into the THz region.

15.4: Design of terahertz Extended Interaction Klystrons

The development of terahertz power amplifiers presents significant new challenges as it brings into focus design, fabrication, and measurement issues that are not important factors at lower frequencies. In this paper, we describe our design approach to meet these challenges with particular emphasis on a 0.67 THz Extended-Interaction Klystron (EIK). This device is being designed to generate a peak power of ∼0.5W with gain of ∼23 dB over an instantaneous bandwidth of 15 GHz. The circuit will be driven by a 100 mA, 25kV electron beam confined in a 0.005″diameter beam tunnel with ∼1 Tesla magnetic field. This choice of beam size ensures that the same electron gun can be employed for all program development phases culminating in a 1.03 THz amplifier. A highly efficient depressed collector has also been designed to meet the efficiency requirement.

Sub-millimeter waves from a compact, low voltage Extended Interaction Klystron

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.

High power CW 264 GHz tunable Extended Interaction Oscillator

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 support THz operation with enhanced output power, which is currently limited by vacuum window capability.

Design and fabrication of terahertz Extended Interaction Klystrons

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.

Wide bandwidth, high average power EIKs drive new radar concepts

Millimeter wave radar and communications capability can be significantly enhanced using improvements to the extended interaction klystron (EIK). This presentation describes the performance resulting from various programs undertaken at CPI (Communications & Power Industries) to increase the bandwidth and power capability of the EIK. This presentation describes the design simulation and corresponding performance results at various frequencies from 27 GHz to 220 GHz.