Cyclotron particle

A cyclotron is a particle accelerator that uses magnetic and electric fields to propel charged particles to high energies, essential in nuclear physics research.

About this subject

The cyclotron was invented by Ernest Lawrence in 1930, for which he received the Nobel Prize in Physics in 1939. This device accelerates particles such as protons or ions in a spiral path between two D-shaped electrodes (called dees), immersed in a perpendicular magnetic field. As particles cross the gap between the dees, they are accelerated by a high-frequency alternating electric field. This process continues until the particles reach the desired energy and are extracted for experiments.

Cyclotrons were crucial for discoveries in nuclear physics, including the production of transuranium elements and the study of nuclear reactions. Today, they have practical applications in medicine: they are used to produce radioisotopes for positron emission tomography (PET) and for proton therapy in cancer treatment. Unlike linear accelerators, cyclotrons achieve high energies in a compact space.

Interestingly, the largest cyclotron in the world, the PSI at the Paul Scherrer Institute in Switzerland, accelerates protons up to 590 MeV. The technology has evolved into synchrotrons, but cyclotrons are still used in university laboratories and hospitals due to their relatively smaller size and lower cost.

Frequently Asked Questions

How does a cyclotron work?

A cyclotron accelerates charged particles in a spiral path using a constant magnetic field to bend the trajectory and an alternating high-frequency electric field to increase energy at each crossing.

What are medical applications of cyclotrons?

Cyclotrons produce radioisotopes for PET scans and protons for radiation therapy. They are sources of positron emission for diagnosis and particle beams for tumor treatment.

What is the difference between a cyclotron and a synchrotron?

In a cyclotron, the magnetic field is constant and the electric field frequency is adjusted to keep resonance. In a synchrotron, the magnetic field varies with energy to maintain a fixed-radius path.