dynode sentence in Hindi
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- Another geometry of continuous-dynode electron multiplier is called the microchannel plate.
- Photomultipliers with large distances between the photocathode and the first dynode are especially sensitive to magnetic fields.
- The continuous dynode was resistive, and its ends were connected to enough voltage to create repeated cascades of electrons.
- Each subsequent dynode impact releases further electrons, and so there is a current amplifying effect at each dynode stage.
- Each subsequent dynode impact releases further electrons, and so there is a current amplifying effect at each dynode stage.
- Because these electrodes are separate from each other, this might be called a " discrete-dynode " multiplier.
- This group of primary electrons is electrostatically accelerated and focused by an electrical potential so that they strike the first dynode of the tube.
- Once it exits the electron gun, its inertia makes the beam move away from the dynode towards the back side of the target.
- The impact of a single electron on the dynode releases a number of secondary electrons which are in turn accelerated to strike the second dynode.
- The impact of a single electron on the dynode releases a number of secondary electrons which are in turn accelerated to strike the second dynode.
- A voltage divider chain of resistors is usually used to place each dynode at a potential 100-200V more positive than the previous one.
- These reflected electrons return down the cathode ray tube toward the first dynode of the electron multiplier surrounding the electron gun which is at high potential.
- It may be considered a 2-dimensional parallel array of very small continuous-dynode electron multipliers, built together and powered in parallel too.
- In the 1930s special amplifying tubes were developed which deliberately " folded " the electron beam, by having it strike a dynode to be reflected into the anode.
- During one of these visits, in September 1934, RCA's Vladimir Zworykin was shown the first multiple-dynode photomultiplier, or " photoelectron multiplier ".
- They can be of the continuous-dynode type, and may have a curved horn-like funnel shape, or they can have discrete dynodes as in a photomultiplier.
- A " continuous-dynode " structure is feasible if the material of the electrodes has a high resistance so that the functions of secondary-emission and voltage-division are merged.
- A typical such " orbital beam hexode " was the RCA 1630, introduced in 1939 . Because the heavy electron current in such tubes damaged the dynode surface rapidly, their lifetime tended to be very short compared to conventional tubes.
- A sharply focused beam of electrons ( a cathode ray ) is generated by the electron gun at ground potential and accelerated by the anode ( the first dynode of the electron multiplier ) around the gun at a high positive voltage ( approx . + 1500 V ).
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