Making of Faraday Cup

You don't mean cup.

Faraday cage - Wikipedia, the free encyclopedia

You can make one out of aluminum foil.

Radioactive sports, maybe?

Or a competition for the best tin foil hat.

Thank you sir,

but it should be in the shape of cylinder. so, do i need to cover a cylindrical object with aluminium foil?

Yes.

Do you know what a Faraday cage is? Or cup, if you insist.

Home-made_Faraday_cage.jpg

sir, according to me it is uased for discharging the charged particles.

I don't think Al foil would work in this case.

A Faraday cage can be any closed shape you want (including cylindrical).

As Lyn said, See the link in post #1.

Sir, can you elaborate more on manufacturing of it?

An internet search of "Faraday cup construction" (or "Faraday cage construction") produced numerous results (and some fairly high end thesis design papers in particle physics), one or more of which should be helpful for you for your particular application (whatever it is).

From what I can see, unlike a Faraday cage, a Faraday cup is a pretty specialised piece of equipment for a narrow and specialised scientific field.

Yes Sir, i also think that faraday cup is a special piece. But can you explain me THE DIFFERENCE BETWEEN FARADAY CAGE AND CUP?

LOKESH, below is from Wikipedia. I don't mean to say, LMGTFY, but this one was pretty easy.

I hope it helps.

(Also from Google: http://www.lanl.gov/conferences/biw10/preprints/TUPSM048_preprint.pdf )

A Faraday cup is a metal (conductive) cup designed to catch charged particles in vacuum. The resulting current can be measured and used to determine the number of ions or electrons hitting the cup.^[1] The Faraday cup is named after Michael Faraday who first theorized ions around 1830.

How it works

When a beam or packet of ions hits the metal it gains a small net charge while the ions are neutralized. The metal can then be discharged to measure a small current equivalent to the number of impinging ions. Essentially the faraday cup is part of a circuit where ions are the charge carriers in vacuum and the faraday cup is the interface to the solid metal where electrons act as the charge carriers (as in most circuits). By measuring the electrical current (the number of electrons flowing through the circuit per second) in the metal part of the circuit the number of charges being carried by the ions in the vacuum part of the circuit can be determined. For a continuous beam of ions (each with a single charge)

Faraday cup with an electron-suppressor plate in front

where N is the number of ions observed in a time t (in seconds), I is the measured current (in amperes) and e is the elementary charge (about 1.60 × 10⁻¹⁹ C). Thus, a measured current of one nanoamp (10⁻⁹ A) corresponds to about 6 billion ions striking the faraday cup each second.

Similarly, a Faraday cup can act as a collector for electrons in a vacuum (for instance from an electron beam). In this case electrons simply hit the metal plate/cup and a current is produced. Faraday cups are not as sensitive as electron multiplier detectors, but are highly regarded for accuracy because of the direct relation between the measured current and number of ions.

A Faraday cage or Faraday shield is an enclosure formed by conducting material or by a mesh of such material. Such an enclosure blocks external static and non-static electric fields. Faraday cages are named after the English scientist Michael Faraday, who invented them in 1836.^[1]

A Faraday cage's operation depends on the fact that an external static electrical field will cause the electric charges within the cage's conducting material to redistribute themselves so as to cancel the field's effects in the cage's interior. This phenomenon is used, for example, to protect electronic equipment from lightning strikes and electrostatic discharges.

Faraday cages cannot block static and slowly varying magnetic fields, such as the Earth's magnetic field (a compass will still work inside). To a large degree, though, they shield the interior from external electromagnetic radiation if the conductor is thick enough and any holes are significantly smaller than the wavelength of the radiation. For example, certain computer forensic test procedures of electronic systems that require an environment free of electromagnetic interference can be carried out within a screen room. These rooms are spaces that are completely enclosed by one or more layers of a fine metal mesh or perforated sheet metal. The metal layers are grounded in order to dissipate any electric currents generated from external or internal electromagnetic fields, and thus they block a large amount of the electromagnetic interference. See also electromagnetic shielding.

The reception or transmission of radio waves, a form of electromagnetic radiation, to or from an antenna within a Faraday cage are heavily attenuated or blocked by a Faraday cage.

See link in post #8 and information in post #17

If you google both the difference is clear.

One is a catcher and the other is barrier.

Do you not have an ounce of practicality in you Lokesh?

Once you know what it is then making it just needs doing. Or getting someone to make it for you per instruction if you have no facilities

Lots of references posted here. Get to it!

Thank you sir, i got the difference but only thing i am looking for is the technical specifications and limitations for manufacturing.

like: what is the minimum concentration of ions for a given size of faraday cup?

Looks like you have a bit of reading ahead of you.

Get good quality clay and make sure you fix the handle properly

Bazzer

I am the google queen and I saw many choices when I googled FARADAY cup...