A voltage applied across the cathode and anode accelerates the electrons towards the far end of the tube, and an external magnetic field around the tube focuses the electrons into a beam. At the other end of the tube the electrons strike the "collector", which returns them to the circuit. Wrapped around the inside of the tube, just outside the beam path, is a helix of wire, typically oxygen-free copper. The RF signal to be amplified is fed into the helix at a point near the emitter end of the tube.
If you wish to contact us to discuss the opportunity of helping you tailor the power supplies to your needs, contact us here. High Voltage Power Technologies The technology and topologies developed and employed by XP Glassman allow us to offer compact and reliable HV power supplies that have the capability of being easily adapted for most applications while being the easiest in the industry to maintain.
Almost all XP Glassman supplies employ air Operation of twt and magnetrons the primary insulating medium and utilize a high frequency PWM off line converter.
Air Insulation While not suitable for ultra-miniaturized modules operating in severe environmental conditions, air insulation offers a lightweight repairable structure that minimizes parasitic capacitance losses for most applications.
We have developed HV structures that incorporate equipotential grading and electrostatic shielding of sensitive components so that we achieve excellent stability and accuracy. All of our HV assemblies are based on the well-known Cockcroft-Walton voltage multiplier concept, or variations, thereofto achieve high DC outputs while minimizing peak transformer secondary voltages.
The use of air allows for forced cooling of HV components when required. Forced air cooling allows us to incorporate an increased value of series protection resistance where practicalwhich minimizes peak discharge currents when an arc or overload occurs.
Some models or applications require external series protection resistance. All these techniques improve the reliability of the entire high voltage assembly, as well as the control and power elements of the complete power supply structure.
Toroidal terminals and equipotential surfaces are used to minimize the electrostatic fields. For units of kV and below, we mount the HV assembly in a proprietary HV insulated enclosure whose walls can withstand the full voltage.
This enclosure is made of fire retardant materials and is designed to provide a uniform surface gradient to minimize corona. This, in turn, is mounted in a grounded chassis.
One of the problems with increasing the conversion frequency in HV supplies is the reflected parasitic capacitance. This is formed by the proximity of surfaces to ground. In a large HV structure, reflected parasitic capacitance can be sizable.
If solid or liquid encapsulation is employed, this capacitance is much higher than in air since the dielectric constant of air is 1. Capacitance is directly proportional to the insulation dielectric constant. Our HV transformers typically have 6kV or less peak voltage on the secondaries and employ special universal winding techniques to produce a self-supporting large diameter winding which has the proper voltage gradients.
In addition, we typically employ large window U-cores which give enough space for the proper gradients. Typically, the AC mains line voltage is rectified and filtered into the DC rails directly off the line with no transformers.
In many cases, a power factor correction boost converter is employed to provide a regulated VDC rail bus. This provides a power factor very close to unity, which virtually eliminates line harmonic currents, and reduces the VA drawn from the mains.
The DC rail voltage is applied to the converter and coupled to the HV assembly via the HV transformers which provide line to ground isolation. The converter drive signals are coupled to the converter switching devices by isolation transformers which also provide line to ground isolation.
The converter topology is well suited to drive large ratio step up transformers as it uses the energy stored in the stray and interwinding transformer capacitance to switch the secondary voltage rather than dissipate it in snubber or switching losses.
The converter is pulse width modulated and utilizes integrated magnetics to store the conversion energy. This is a zero current turn on topology that eliminates turn on losses.ABSTRACT A review of TWT technology is presented comparing selected aspects and design procedures relative to application.
The general theory of operation of various types of TWT designs. One main type of transmitters is the keyed-oscillator type. In this transmitter one stage or tube, usually a magnetron produces the rf pulse. The oscillator tube is keyed by a high-power dc pulse of energy generated by a separate unit called the ashio-midori.com transmitting system is called POT (Power Oscillator Transmitter).Radar units fitted with a POT are either non-coherent or pseudo-coherent.
Inspection and operation after 24 hours of salt fog exposure where buildups of salt deposits are critical to the proper operation of the test item Specify if operation of electrical system is .
XP Glassman are able to offer a solution to most high voltage DC power supply requirements either from arguably the largest standard range of high voltage power supplies within the industry, or indeed by adjustment, modification or complete custom design and manufacture.
A traveling-wave tube (TWT, pronounced "twit") or traveling-wave tube amplifier (TWTA, pronounced "tweeta") is a specialized vacuum tube that is used in electronics to amplify radio frequency (RF) signals in the microwave range.
The TWT belongs to a category of "linear beam" tubes, such as the klystron, in which the radio wave is . Radar, electromagnetic sensor used for detecting, locating, tracking, and recognizing objects of various kinds at considerable ashio-midori.com operates by transmitting electromagnetic energy toward objects, commonly referred to as targets, and observing the echoes returned from them.