Electric Current and Electric Circuits
... The greater the voltage, the greater the current The lower the voltage, the lower the current The lower the resistance, the greater the current The greater the resistance, the lower the current ...
... The greater the voltage, the greater the current The lower the voltage, the lower the current The lower the resistance, the greater the current The greater the resistance, the lower the current ...
X-ray tube consist from
... and better visibility of detail, and large focal spots have a greater heatdissipating capacity. Most x-ray tubes have two focal spot sizes (small and large), which can be selected by the operator according to the imaging procedure. ...
... and better visibility of detail, and large focal spots have a greater heatdissipating capacity. Most x-ray tubes have two focal spot sizes (small and large), which can be selected by the operator according to the imaging procedure. ...
Module 6: Field Emission Display
... optimized for high voltage and low current density (few mA/cm 2). The use of high voltage (>3KV) allows the backside aluminization of the phosphor screen. Many CRT phosphors lose 50% of their initial efficiency (200 C/cm 2) electron dose due to Coulombic aging. FEDs require higher current densities ...
... optimized for high voltage and low current density (few mA/cm 2). The use of high voltage (>3KV) allows the backside aluminization of the phosphor screen. Many CRT phosphors lose 50% of their initial efficiency (200 C/cm 2) electron dose due to Coulombic aging. FEDs require higher current densities ...
hv > eq - Rutgers Physics
... Provisions exist for connecting the anode ring to a 6.3-V a-c supply; thus the anode may be heated in order to evaporate any potassium traces that have deposited on it. It is usually adequate to close the circuit mo mentarily, since long heating will destroy the anode. The retarding (or acceleratin ...
... Provisions exist for connecting the anode ring to a 6.3-V a-c supply; thus the anode may be heated in order to evaporate any potassium traces that have deposited on it. It is usually adequate to close the circuit mo mentarily, since long heating will destroy the anode. The retarding (or acceleratin ...
Sensors - SENSE
... A form of energy made up of moving electrons that can produce light, heat, or motion ...
... A form of energy made up of moving electrons that can produce light, heat, or motion ...
Carrier Mobility
... moves in a crystal when an electric field is present. The electric field is the force applied to the carrier. ▫ For electrons: vd = mn E ▫ For holes: v d = mp E ...
... moves in a crystal when an electric field is present. The electric field is the force applied to the carrier. ▫ For electrons: vd = mn E ▫ For holes: v d = mp E ...
Advanced magnet bar designs for rotatable magnetrons
... • Target erosion right to the end of the target – no redeposit • High target use > 75% guaranteed for flat metallic targets on 152mm OD at less than 5mTorr pressures • Magnetics protected from the water cooling via stainless steel encapsulation for long term stability – Helium leak checked • Magneti ...
... • Target erosion right to the end of the target – no redeposit • High target use > 75% guaranteed for flat metallic targets on 152mm OD at less than 5mTorr pressures • Magnetics protected from the water cooling via stainless steel encapsulation for long term stability – Helium leak checked • Magneti ...
docx
... 5.1 Every set of magnet current Itot (and thus magnetic field Btot), accelerating voltage V and orbit radius r provides an independent measurement of e/m. (If the two voltages for the two positions (original and rotated) are not identical, then use the average of the two in the calculation) 5.2 Esti ...
... 5.1 Every set of magnet current Itot (and thus magnetic field Btot), accelerating voltage V and orbit radius r provides an independent measurement of e/m. (If the two voltages for the two positions (original and rotated) are not identical, then use the average of the two in the calculation) 5.2 Esti ...
Lec_18-Thyristors
... Silicon Unilateral Switch (SUS) – has built in low voltage avalanche diode ...
... Silicon Unilateral Switch (SUS) – has built in low voltage avalanche diode ...
______ is the ability to do work
... called charging by __________, and in the end both conductors end up with a ________ charge. When you move two charged objects closer together, the electric force between the two becomes _______ (stronger, weaker). When you ground a neutral object that is near a negative object, the process is calle ...
... called charging by __________, and in the end both conductors end up with a ________ charge. When you move two charged objects closer together, the electric force between the two becomes _______ (stronger, weaker). When you ground a neutral object that is near a negative object, the process is calle ...
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.