Wehnelt cylinder

A cross-section view, showing how a Wehnelt localizes emissions at the filament tip and serves as a convergent electrostatic lens.

A Wehnelt cylinder (also known as Wehnelt cap, grid cap or simply Wehnelt) is an electrode in the electron gun assembly of some thermionic devices, used for focusing and control of the electron beam. It is named after Arthur Rudolph Berthold Wehnelt, a German physicist, who invented it during the years 1902 and 1903. Wehnelt cylinders are found in the electron guns of cathode ray tubes and electron microscopes, and in other applications where a thin, well-focused electron beam is required.

单词	Grid cap
释义	Grid cap 英语百科 Wehnelt cylinder A Wehnelt cylinder (also known as Wehnelt cap, grid cap or simply Wehnelt) is an electrode in the electron gun assembly of some thermionic devices, used for focusing and control of the electron beam. It is named after Arthur Rudolph Berthold Wehnelt, a German physicist, who invented it during the years 1902 and 1903. Wehnelt cylinders are found in the electron guns of cathode ray tubes and electron microscopes, and in other applications where a thin, well-focused electron beam is required.
随便看	standard rotary rig的意思 standard rotating direction的意思 standard rotor的意思 standard round的意思 standard round test bar的意思 standard route的意思 standard rudder的意思 standard rule的意思 standard rule based structure的意思 Standard ruler的意思 standard rulers的意思 standard run labor hours的意思 standard run labor rate的意思 standard run machine hours的意思 standard running conditions的意思 standard run quantity的意思 standard的意思 standard safety analysis report的意思 Standard Safety Margin的意思 standards,albumin的意思 standard saline citrate的意思 standard sample的意思 standard sample of casting surface roughness的意思 standard sample of dye的意思 standard sample of soil的意思

Grid cap

Wehnelt cylinder