Perrin Tube D

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Experiment Topics:_..

The following topics can be discussed with this highly evacuated tube:
• Evidence of the particle nature of cathode beam
• Establishment of the polarity of cathode beam
•  Estimation of the specific electron charge e/m
•  Deflection in crossed magnetic alternating fields (Lissajous figures)
•  Deflection in collinear alternating magnetic and electric fields

Product Information:_..

The Perrin Tube is a highly evacuated tube with an electron gun, consisting of an oxide cathode heated indirectly via a heating coil, a cylindrical anode and pair of deflector plates contained in a clear glass bulb, partly coated with a fluorescent screen. The electrons emitted by the electron gun form a narrow circular beam that can be seen as a spot on the fluorescent screen. A glass tube with a Faraday cage is set on the glass bulb at about 45° to the undeflected beam.
The Perrin tube serves to demonstrate the negative polarity of electrons and to estimate the specific electron charge e/m by magnetic deflection into a Faraday cage, which is connected to an electroscope. It is also possible to investigate the deflection of electrons in two perpendicular magnetic alternating fields or by collinear electric and magnetic alternating fields (Lissajous figures).

Specifications:_..

Filament voltage U_F:	max. 6.3 V AC/DC
Anode voltage U_A:	2000 V – 5000 V
Anode current I_A:	typ. 180 µA at U_A = 4000 V
Beam current:	4 µA at U_A = 4000 V
Plate voltage:	50 V – 350 V
Glass bulb:	130 mm Ø approx.
Total length:	260 mm approx.