Lab2: E/M Ratio
... a kinetic energy of Ek = e ยท V = (1/2)mv 2 in the classical limit. The tub also contains a trace amount of gas which fluoresces when struck by electrons, so that you can see the beam trajectory by eye. The tube is supported at the center of a pair of large Helmholtz coils producing a uniform magneti ...
... a kinetic energy of Ek = e ยท V = (1/2)mv 2 in the classical limit. The tub also contains a trace amount of gas which fluoresces when struck by electrons, so that you can see the beam trajectory by eye. The tube is supported at the center of a pair of large Helmholtz coils producing a uniform magneti ...
Magnetron_Stabilisation
... We believe the lower frequency corresponds to a state where the subsynchronous zone is not space charge limited. If a pulsed magnetron is operated in the lower frequency state (having less associated noise) then if too many electrons are released from the cathode during the pulse then the magnetron ...
... We believe the lower frequency corresponds to a state where the subsynchronous zone is not space charge limited. If a pulsed magnetron is operated in the lower frequency state (having less associated noise) then if too many electrons are released from the cathode during the pulse then the magnetron ...
High power X and C band magnetrons for linac system Handling
... sidearm and the others. These rays can constitute a health hazard unless adequate shielding for X-ray radiation is provided. RF Radiation Personnel must not be exposed to excessive RF radiation. High voltage magnetrons not only emit RF energy from the RF output but also leak one from the input insul ...
... sidearm and the others. These rays can constitute a health hazard unless adequate shielding for X-ray radiation is provided. RF Radiation Personnel must not be exposed to excessive RF radiation. High voltage magnetrons not only emit RF energy from the RF output but also leak one from the input insul ...
II.3. DETERMINATION OF THE ELECTRON SPECIFIC CHARGE BY
... the magnetic field. Their trajectories, starting from the cathode and ending on the anode, curve themselfs. If the magnetic field becomes great enough, then it is possible that the electrons can never reach the anode. This happens when their trajectories become circular, with the radius r = R/2. In ...
... the magnetic field. Their trajectories, starting from the cathode and ending on the anode, curve themselfs. If the magnetic field becomes great enough, then it is possible that the electrons can never reach the anode. This happens when their trajectories become circular, with the radius r = R/2. In ...
therapy machines
... Adjustable collimators (secondary) - used to give appropriate field sizes for the treatment fields Magnetron: ...
... Adjustable collimators (secondary) - used to give appropriate field sizes for the treatment fields Magnetron: ...
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.