SUMMARY

YMP-6109 modern physics experiment apparatus is for university teaching of ideal vacuum diode-related experiments. It is an expansion ofthe YMP-6108 Metal Electron Work Function Experiment apparatus. A solenoid coil and power supply are added. Apart from measuringthe metal’s work function, YMP-6109 can also detect the electron movement in a radial electric field and axial magnetic field and study the Fermi-Dirac distribution and the volt-ampere characteristics of ideal vacuum diodes.

PURPOSE

1. ‍Understand Fermi-Dirac quantum statistical law.‍

2. Understand the law of hot electron emission and master the measurement method of electron work function.‍

3. ‍Analysis of electronic work from cathode materials by Richardson linear method.‍

FEATURES

• Ideal vacuum diodes are transparent andintuitive

  The ideal vacuum diode is inserted on the independenttube seat, and is equipped with a   transparent acrylic protectivecover, which can not only intuitively observe the working state of the vacuumdiode, but also effectivelyprotect the glass device.The independent tubebase is engraved with a clear experimental schematic diagram, which can enablestudents to better understand the entire experimental principle.
  

  

• Accurate and stable anode currrent

  The anode current measurement module uses a micro-ampcurrent amplifier and   a four and a half digital display meter, witha measurement range of up to 0.1uA~20mA, which can measure weak anodecurrent   accurately, finely and stably.

• Anode voltage output is efficient and accurate

  The anode voltage output uses a linear power supply,and the output amplitude reaches 0~160.0V, which can provide the anode voltageof the vacuum diode stably and efficiently.

• Solenoid coil

  Conveniently placed on top of the acrylic cover

• Expandable to digital experiment

  Digital experiment: the instrument can be equipped with 2-channel data acquisition interface and voltage sensor, which can be upgraded to a computer-based digital data acquisition and analysis experiment system.

  
  

EXPERIMENTS

1. Determination of work function of metal electron   

a. Anode current and its logarithmic value at different anode voltages and filament temperatures, graph l_gI_a～√U_a

b. The calculated values of l_g( I / T²) and 1 / T at different temperatures T

Slope of straight line：m = -22756

Escape potential: φ = 4.52 (V)

Work function: e_φ = 4.52 eV

Recognized value of work function: e_φ=4.54eV　Relative error：Er = 0.53%

2. Electron movement in radial electric field and axial magnetic field (Magnetron method measures electron charge-to-mass ratio)

3. Research on Fermi-Dirac distribution