Build a Lenard Tube: Anode, Cathode & Window Potential

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In summary, when building a Lenard tube with a titanium window, it is important to consider the electrical conductivity of the epoxy used to glue the window in place. If the epoxy is conductive, the window should be connected to a voltage source to prevent any potential issues.
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VACUUMIST
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I am planning to build a Lenard tube.
Anode and cathode will be in a glass envelope, and the thin titanium window at one extreme of the ampoule.
I doubt about the potential needed at the metallic window.
As I will glue it with an epoxi, the window will be electrically floating and I wonder if this could be a problem.
Thanks in advance,
Vacuumist
 
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  • #2
The potential at the metallic window should not be an issue as long as the epoxy used does not allow electrical conductivity. If it does, then the window will need to be connected to a voltage source in order for current to flow through the tube. If you are unsure about the conductivity of the epoxy, it may be best to connect the window to one of the electrodes as a precaution.
 

FAQ: Build a Lenard Tube: Anode, Cathode & Window Potential

1. What is a Lenard tube and what is its purpose?

A Lenard tube is a type of experimental apparatus used in the study of cathode rays, or streams of electrons, discovered by physicist Philipp Lenard in the late 19th century. The purpose of the tube is to demonstrate the properties and behavior of cathode rays when exposed to different electric and magnetic fields.

2. What are the main components of a Lenard tube?

The main components of a Lenard tube include an anode (a positively charged electrode), a cathode (a negatively charged electrode), and a window potential (a thin metal foil that allows the cathode rays to pass through). The tube is typically filled with a low pressure gas, such as helium or hydrogen, to help visualize the cathode rays.

3. How does a Lenard tube work?

When a high voltage is applied between the anode and cathode, the cathode emits a stream of electrons, known as cathode rays. These rays travel through the gas-filled tube and are deflected by electric and magnetic fields. The window potential allows the rays to exit the tube and be observed.

4. What are some applications of a Lenard tube?

A Lenard tube is primarily used for educational and experimental purposes to demonstrate the properties of cathode rays. It has also been used in the past for X-ray production and as a tool for studying atomic and subatomic particles.

5. What are some safety precautions when working with a Lenard tube?

It is important to use caution when working with a Lenard tube, as it involves high voltages and can emit X-rays. Proper safety measures, such as wearing protective gear and handling the tube carefully, should be followed. It is also important to use the tube in a well-ventilated area and to never touch the electrodes or window potential while the tube is in use.

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