Plasma Processing of Large Surfaces with Application to SRF Cavity
... Plasma based surface modification is a promising alternative to wet etching of superconducting radio frequency (SRF) cavities. The crucial aspect of the technology development is dependence of the etching rate and surface roughness on the frequency of the power supply, pressure, power level, driven ...
... Plasma based surface modification is a promising alternative to wet etching of superconducting radio frequency (SRF) cavities. The crucial aspect of the technology development is dependence of the etching rate and surface roughness on the frequency of the power supply, pressure, power level, driven ...
Full-text
... and value of flow changes by sinus law. In next half-cycle the value of flow is changing according to sine low, but the direction is changing by 600. In the time of six half-cycle (3 periods) magnetic flow make full turn on 360 0. This rotating field induces EMF in rotor windings. Elektromagnetical ...
... and value of flow changes by sinus law. In next half-cycle the value of flow is changing according to sine low, but the direction is changing by 600. In the time of six half-cycle (3 periods) magnetic flow make full turn on 360 0. This rotating field induces EMF in rotor windings. Elektromagnetical ...
Kilovoltage Units
... incorporate a safety feature in which the beam is terminated automatically in the event of power failure or emergency. When the source is in the BEAM-OFF position, a light source appears in the BEAM-ON position above the collimator opening, allowing an optical visualization of the radiation field, a ...
... incorporate a safety feature in which the beam is terminated automatically in the event of power failure or emergency. When the source is in the BEAM-OFF position, a light source appears in the BEAM-ON position above the collimator opening, allowing an optical visualization of the radiation field, a ...
Redox Reactions
... site of oxidation creates a flow of electrons towards the site of reduction. ...
... site of oxidation creates a flow of electrons towards the site of reduction. ...
Atoms and electrons - Dr Chaamwe
... with the distance squared. If an increase in one thing causes an increase in something else, these two things are said to vary directly. 2,000,000 electrons on an object produce twice the negative charge than 1,000,000 electrons would. ...
... with the distance squared. If an increase in one thing causes an increase in something else, these two things are said to vary directly. 2,000,000 electrons on an object produce twice the negative charge than 1,000,000 electrons would. ...
Here the details as described by Paul E. Potter.
... In view of the fact that it's designers have chosen to wind insulated wire (which may or may not be bifilar) around the horseshoe metal it is likely that the horseshoes are used for some form of induction [note 17], it would also be very possible to draw directly from this part of the circuit the ex ...
... In view of the fact that it's designers have chosen to wind insulated wire (which may or may not be bifilar) around the horseshoe metal it is likely that the horseshoes are used for some form of induction [note 17], it would also be very possible to draw directly from this part of the circuit the ex ...
Current Sourcing ZCS Magnetron Driver for Low Input Voltage
... applications. In such cases, the current fed back to the bus at the commutation instance will cause considerable ringing due to the parasitics, increasing EMI emission and power loss. Another drawback is the fact that these converters are turned off under extremely high currents which again increase ...
... applications. In such cases, the current fed back to the bus at the commutation instance will cause considerable ringing due to the parasitics, increasing EMI emission and power loss. Another drawback is the fact that these converters are turned off under extremely high currents which again increase ...
Cavity magnetron
The cavity magnetron is a high-powered vacuum tube that generates microwaves using the interaction of a stream of electrons with a magnetic field while moving past a series of open metal cavities (cavity resonators). Bunches of electrons passing by the openings to the cavities excite radio wave oscillations in the cavity, much as a guitar's strings excite sound in its sound box. The frequency of the microwaves produced, the resonant frequency, is determined by the cavities' physical dimensions. Unlike other microwave tubes, such as the klystron and traveling-wave tube (TWT), the magnetron cannot function as an amplifier, increasing the power of an applied microwave signal, it serves solely as an oscillator, generating a microwave signal from direct current power supplied to the tube.The first form of magnetron tube, the split-anode magnetron, was invented by Albert Hull in 1920, but it wasn't capable of high frequencies and was little used. Similar devices were experimented with by many teams through the 1920s and 30s. On November 27, 1935, Hans Erich Hollmann applied for a patent for the first multiple cavities magnetron, which he received on July 12, 1938, but the more stable klystron was preferred for most German radars during World War II. The cavity magnetron tube was later improved by John Randall and Harry Boot in 1940 at the University of Birmingham, England. The high power of pulses from their device made centimeter-band radar practical for the Allies of World War II, with shorter wavelength radars allowing detection of smaller objects from smaller antennas. The compact cavity magnetron tube drastically reduced the size of radar sets so that they could be installed in anti-submarine aircraft and escort ships.In the post-war era the magnetron became less widely used in the radar role. This was because the magnetron's output changes from pulse to pulse, both in frequency and phase. This makes the signal unsuitable for pulse-to-pulse comparisons, which is widely used for detecting and removing ""clutter"" from the radar display. The magnetron remains in use in some radars, but has become much more common as a low-cost microwave source for microwave ovens. In this form, approximately one billion magnetrons are in use today.