The energy imnparted to the secondary emission electrons will be another power loss .-GlowWoprm . Preceding talk ) 20 : 57, 16 April 2009 ( UTC)
32.
The photomultiplier tube is an extremely sensitive detector of light, which uses the photoelectric effect and secondary emission, rather than thermionic emission, to generate and amplify electrical signals.
33.
"' Enhancement "'occurs where the secondary X-rays emitted by a heavier element are sufficiently energetic to stimulate additional secondary emission from a lighter element.
34.
It exploited the positive or negative electrostatic charge generated by displaying either a dash or a dot at any position on the CRT screen, a phenomenon known as secondary emission.
35.
Secondary emission electrons from the anode are repelled by the negative potential on the suppressor grid, so they can't reach the screen grid but return to the anode.
36.
In 1935, he left Cornell to take a position at RCA to work on both theoretical and experimental work on secondary emission, pickup tubes, and field electron emission.
37.
The solution was to add another grid between the screen grid and the main anode, called the suppressor grid ( since it suppressed secondary emission current toward the screen grid ).
38.
As the electron energy is increased, the rate increases until it reaches a critical threshold, when the number of secondary emissions is greater than the number supplied by the gun.
39.
The American devices although having no secondary emission due to the suppressor grid, nevertheless were able to get the required non linearity by biasing the oscillator such that the valve was overdriven.
40.
One variant called a " channel electron multiplier " does not use individual dynodes but consists of a curved tube, such as a helix, coated on the inside with material with good secondary emission.
