Electron Guns
... sharp point (<100nm) Apply 3-5kV potential relative to first anode (very strong field at tip, >107 V/cm) Electrons can escape cathode without application of thermal energy Very high vacuum (10-10 torr or better) Use second anode for accelerating electrons Etched carbide tip (AP Tech) ...
... sharp point (<100nm) Apply 3-5kV potential relative to first anode (very strong field at tip, >107 V/cm) Electrons can escape cathode without application of thermal energy Very high vacuum (10-10 torr or better) Use second anode for accelerating electrons Etched carbide tip (AP Tech) ...
Introduction Batteries
... electrolyte. • During discharge the processes are reversed. Li-ions move from the anode to the cathode through the electrolyte while electrons flow through the external circuit from the anode to the cathode and produce power. • To a large extent, the cathode material limits the performance of curren ...
... electrolyte. • During discharge the processes are reversed. Li-ions move from the anode to the cathode through the electrolyte while electrons flow through the external circuit from the anode to the cathode and produce power. • To a large extent, the cathode material limits the performance of curren ...
Modern Physics Laboratory
... involving diffraction of electrons by a crystalline solid--in principle very similar to this one. Such diffraction is understood to be a wave phenomenon, and observing it with electrons confirmed their wave aspect. Bragg Diffraction, Bragg's Law When a beam of plane electromagnetic waves (such as X ...
... involving diffraction of electrons by a crystalline solid--in principle very similar to this one. Such diffraction is understood to be a wave phenomenon, and observing it with electrons confirmed their wave aspect. Bragg Diffraction, Bragg's Law When a beam of plane electromagnetic waves (such as X ...
4. Electron Charge-to
... The 19th century experiments with cathode rays involved glass containers of different shapes and designs, but generally called tubes, of which an important example is the Crookes tube7 . These tubes could be evacuated to a low pressure, and contained two separate electrodes connected to an external ...
... The 19th century experiments with cathode rays involved glass containers of different shapes and designs, but generally called tubes, of which an important example is the Crookes tube7 . These tubes could be evacuated to a low pressure, and contained two separate electrodes connected to an external ...
Voltage Current and Resistance
... electric lamp is a tiny metal "filament" inside of a clear glass bulb, which glows white-hot ("incandesces") with heat energy when sufficient electric current passes through it. Like the battery, it has two conductive connection points, one for electrons to enter and the other for electrons to exit. ...
... electric lamp is a tiny metal "filament" inside of a clear glass bulb, which glows white-hot ("incandesces") with heat energy when sufficient electric current passes through it. Like the battery, it has two conductive connection points, one for electrons to enter and the other for electrons to exit. ...
Bill_O_electronics_lecture7
... Direct Current: Flows only one way Alternating Current: First flows one way and then the opposite direction ...
... Direct Current: Flows only one way Alternating Current: First flows one way and then the opposite direction ...
bymbm`
... to return the cathode ray beam to its starting vision receiver suitably embodying my invention. position to produce a high potential which may Referring to the drawing, there is shown an be recti?ed and supplied to the anode of the 20 output power tube I which applies current to the cathode ray tube ...
... to return the cathode ray beam to its starting vision receiver suitably embodying my invention. position to produce a high potential which may Referring to the drawing, there is shown an be recti?ed and supplied to the anode of the 20 output power tube I which applies current to the cathode ray tube ...
Electric Current
... [demo – Van Der Graaf generator & fluorescent tube] Whichever method we use, we are moving charged particles from one place to another. Electric Current in Metals Metals contain free electrons; these are electrons that are not specifically bound to one atom and are free to move around inside the met ...
... [demo – Van Der Graaf generator & fluorescent tube] Whichever method we use, we are moving charged particles from one place to another. Electric Current in Metals Metals contain free electrons; these are electrons that are not specifically bound to one atom and are free to move around inside the met ...
Power VS Frequency - Pulse Electronics
... With Planar we can accomplish more interleaving to reduce the effect of proximity effect. This interleaving can be customized to either reduce the leakage inductance or to have a specific amount of leakage needed for application like Zero voltage switching. Planar transformers if designed properly c ...
... With Planar we can accomplish more interleaving to reduce the effect of proximity effect. This interleaving can be customized to either reduce the leakage inductance or to have a specific amount of leakage needed for application like Zero voltage switching. Planar transformers if designed properly c ...
4.3 Forced Oscillations and Resonance
... which causes the amplitude of the oscillations to increase. • Resonance occurs when the an oscillator is acted upon by a driving force that has the same frequency as the natural frequency • The driving force easily transfers its energy to the oscillator • From the picture the amplitude of oscillatio ...
... which causes the amplitude of the oscillations to increase. • Resonance occurs when the an oscillator is acted upon by a driving force that has the same frequency as the natural frequency • The driving force easily transfers its energy to the oscillator • From the picture the amplitude of oscillatio ...
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.