What are the differences. What are advantages/disadvantages of each?
Magnetron: Produces microwaves with v=3000 MHz, orginally used for radar and microwave ovens, operates at about 2 MW peak output, typically used to produce electron beams up to 15 MeV. MAGNETRON MAKES MICROWAVES
Klystron: Microwave amplifier driven by a low power microwave oscillator, operates at a peak output of 5 MW. KLYSTRON "Carries" MICROWAVES.
KLYSTRON is perceived to be more durable but is more expensive.
Sunday, October 22, 2006
Thyratron
DRR writes:
Hendee (Radiation Therapy Physics p 62) states that the thyratron is a switching tube and is essentially a gas filled triode. When the grid is charged positively, the electrons flow from the cathode to the anode. The gas within the tube ionizes and conducts larger currents than do other switching devices. At the end of the pulse, the grid voltage is removed, preventing further current flow while the pulse forming network recharges. This cycle is repeated between 50 and 500 times per second.
Hendee (Radiation Therapy Physics p 62) states that the thyratron is a switching tube and is essentially a gas filled triode. When the grid is charged positively, the electrons flow from the cathode to the anode. The gas within the tube ionizes and conducts larger currents than do other switching devices. At the end of the pulse, the grid voltage is removed, preventing further current flow while the pulse forming network recharges. This cycle is repeated between 50 and 500 times per second.
Monday, October 9, 2006
MOSFETS
MOSFET (metal- oxide semiconductor field effect transistor)
MOSFET 3-Terminal
The Metal Oxide Semiconductor Field Effect Transistor (MOSFET) builds upon the basic FET by adding a layer of silicon dioxide as illustrated schematically. It achieves extremely high input impedance, in the range 109 to 1014 ohms.
Virtual SSD
Describe the steps necessary for determining the virtual SSD of a linac. Why would we want to perform this?
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