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Pasour J.,U.S. Navy | Nguyen K.,Beam Wave Research | Wright E.,Beam Wave Research | Balkcum A.,Communications and Power Industries Inc. | And 3 more authors.
IEEE Transactions on Electron Devices | Year: 2011

The design and development of a high-perveance sheet electron beam is reported. A beamstick that employs a novel sheet beam gun together with a permanent magnet solenoid has been fabricated and tested up to 4.8 A at 22 kV. At the nominal operating point of 19.5 kV and 3.3 A, this beamstick has transported 98.5% of the emitted electron current through a 0.4 × 5 mm beam tunnel over a distance of 20 mm in a uniform 8.5-kG field. The beamstick collector has been depressed to -9 kV with very little effect on the beam transport. The performance very well agrees with simulations. This beamstick will be the basis for a high-power (∼ 10-kW) W-band extended-interaction- klystron amplifier that is currently under development. © 2011 IEEE.

Chernin D.,SAIC | Antonsen Jr. T.M.,University of Maryland University College | Chernyavskiy I.A.,SAIC | Vlasov A.N.,U.S. Navy | And 3 more authors.
IEEE Transactions on Electron Devices | Year: 2011

We describe a steady-state large-signal model of coupled-cavity traveling-wave tubes in which the input and output signals are periodic functions of time that may be represented by Fourier series of finite length. The model includes both linear and nonlinear effects including circuit dispersion, reflections, intermodulation, and harmonic generation. The model uses a lumped element representation of the circuit and a 1-D disk model of the beam. Several favorable comparisons of model predictions with experimental measurements, including gain versus frequency and power transfer characteristics, are illustrated. The inclusion of nonlinear effects in this multifrequency model enables predictions of intermodulation products, as functions of the input power. An example of the computation of C3IM is illustrated. © 2011 IEEE.

Pershing D.E.,Beam Wave Research | Nguyen K.T.,Beam Wave Research | Abe D.K.,U.S. Navy | Wright E.,Beam Wave Research | And 8 more authors.
IEEE Transactions on Electron Devices | Year: 2014

A sheet-beam coupled-cavity traveling wave tube has produced over 10 kW of peak power at a center frequency of 34 GHz, with a 3-dB bandwidth of almost 5 GHz. The power of this amplifier is an order of magnitude higher than state-of-the-art conventional amplifiers of comparable frequency, bandwidth, and operating voltage (<20 kV). This unprecedented performance is made possible by a unique, Naval Research Laboratory (NRL)-developed sheet electron beam along with a novel slow-wave interaction structure. High-current, low-voltage operation provides high gain per unit length and allows an interaction structure <5-cm long to be used to achieve the desired gain of 15 dB at saturation. Measured performance agrees well with 3-D particle-in-cell simulations. © 1963-2012 IEEE.

Pasour J.,U.S. Navy | Wright E.,Beam Wave Research | Nguyen K.T.,Beam Wave Research | Balkcum A.,Communications and Power Industries Inc. | And 3 more authors.
IEEE Transactions on Electron Devices | Year: 2014

A technological breakthrough is embodied in the successful demonstration of an extended interaction klystron (EIK) amplifier, which has produced over 7.5 kW of peak output power at W-band (94 GHz). An efficiency of ~17 has been achieved with a depressed collector. The EIK is driven by a 20-kV, 4-A sheet beam in a permanent magnet solenoid, with 99% beam current transmission from gun to collector. Key features that contribute to the success of this device are: 1) tight beam focusing and correspondingly narrow beam tunnel, which are made possible by the solenoidal focusing and which provide high interaction impedance and high gain per unit length and 2) the incorporation of design elements to stabilize the inherently over-moded circuit. Measured performance agrees well with 3-D particle-in-cell simulations. © 1963-2012 IEEE.

Felch K.,Communications and Power Industries Inc. | Blank M.,Communications and Power Industries Inc. | Borchard P.,Communications and Power Industries Inc. | Cahalan P.,Communications and Power Industries Inc. | Cauffman S.,Communications and Power Industries Inc.
EPJ Web of Conferences | Year: 2012

Two megawatt-class gyrotrons at frequencies of 110 GHz and 170 GHz have recently been fabricated at CPI. The 110 GHz gyrotron is designed to produce 1.2 MW of output power for 10-second pulses, and will be used for electron cyclotron heating and current drive on the DIII-D tokamak at General Atomics. This gyrotron has completed factory testing and has been delivered to General Atomics for installation and additional testing. The 170 GHz gyrotron, though specified as a 500 kW CW system, has been designed with the goal of generating up to 1 MW CW. Oak Ridge National Laboratory will use this gyrotron in ITER ECH transmission line testing. This gyrotron has been fabricated and is awaiting factory testing, Design features of each gyrotron are described, and test data for the 110 GHz gyrotron are presented. © Owned by the authors, published by EDP Sciences, 2012.

Joye C.D.,U.S. Navy | Cook A.M.,U.S. Navy | Calame J.P.,U.S. Navy | Abe D.K.,U.S. Navy | And 8 more authors.
IEEE Transactions on Electron Devices | Year: 2014

We present the first vacuum electronic traveling wave amplifier to incorporate an interaction circuit fabricated by ultraviolet (UV) photolithography and electroforming, demonstrating over 60 W of output power at 214.5 GHz from a 12.1 kV, 118 mA electron beam. The tube also achieved an instantaneous bandwidth of ∼15 GHz in G-band in the small signal regime. The all-copper circuit was fabricated in two layers using a UV-transparent polymer monofilament embedded in the photoresist to form the beam tunnel prior to electroforming. Effects arising from fabrication errors and target tolerances are discussed. This microfabrication technique and demonstration paves the way for a new era of vacuum electron devices that could extend into the 1-2 THz range with advances in high-current-density electron guns. © 1963-2012 IEEE.

Balkcum A.,Communications and Power Industries Inc.
2010 IEEE International Vacuum Electronics Conference, IVEC 2010 | Year: 2010

Repair histories for over 1,000 klystrons of four fundamentally different design types and applications continue to be monitored. Statistical analysis of the failure data accumulated over nearly twenty years indicate mean time between failure values at the 90% confidence level ranging from 17 to 39 field service years for these devices. Comparison to the previous values indicates that the product lifetimes continue to improve. © 2010 IEEE.

Cook A.M.,U.S. Navy | Joye C.D.,U.S. Navy | Kimura T.,Communications and Power Industries Inc | Wright E.L.,Beam-Wave Research, Inc. | Calame J.P.,U.S. Navy
IEEE Transactions on Electron Devices | Year: 2013

We present electromagnetic cold-test measurements of BeO ceramic pillbox vacuum windows for a 220-GHz traveling-wave tube amplifier. Transmission and reflection measurements show better than 20 dB return loss over a 25 GHz bandwidth, with band centers in the range of 212-225 GHz. We observe tuning of the window response as the circular waveguide length is changed. High-power testing is performed at 2.5 W, 100% duty at 218 GHz. © 1963-2012 IEEE.

Shabazian A.,Communications and Power Industries Inc. | Begum R.,Communications and Power Industries Inc. | Stockwell B.C.,Communications and Power Industries Inc.
2012 IEEE 13th International Vacuum Electronics Conference, IVEC 2012 | Year: 2012

CPI has successfully completed a development program to design and build a 5MW X-band klystron for medical and cargo screening applications. The VKX-8253A amplifier is water-cooled, solenoid focused, fixed tuned klystron. SN-001 was built and tested in 2011 and demonstrated 5.4MW of peak and 18kW of average RF power at 9.3 GHz. The design approach and the experimental results will be discussed in this paper. © 2012 IEEE.

Einarson S.,Communications and Power Industries LLC | Treado T.,Communications and Power Industries LLC
IPAC 2014: Proceedings of the 5th International Particle Accelerator Conference | Year: 2014

CPI has been designing and manufacturing fundamental power couplers for superconducting accelerators for over a dozen years. We have manufactured approximately 200 power couplers of 16 different designs. Power coupler frequencies have ranged from 175 MHz to 3.9 GHz and power levels have ranged from 5 kW to 500 kW average power. We have developed and qualified several key manufacturing processes including a high-RRR copper plating process and a titanium nitride coating process. In addition, we have established uniform quality control and inspection processes which ensure that the power couplers will meet the requirements for the intended use in superconducting accelerators. These processes have been developed, improved and/or qualified in collaboration with colleagues at superconducting accelerator facilities throughout the world. This paper will provide an overview of these critical manufacturing and quality control processes. Copyright © 2014 CC-BY-3.0 and by the respective authors.

Loading Communications and Power Industries Inc. collaborators
Loading Communications and Power Industries Inc. collaborators