A cyclotron is a type of particle accelerator invented by Ernest Lawrence in 1929-1930. It uses a constant magnetic field to propel charged subatomic particles in a spiral path between two hollow semi-circular electrodes called dees. The particles gain energy each time they pass through an alternating electric field generated by making one dee positively charged and the other negatively charged during each half cycle. The cyclotron can accelerate positive ions like protons, deuterons, and alpha particles that are generated from an ion source.

1. P.RAMYA M Sc M Phil.,
ASSITANT PROFESSOR
BON SECOURS COLLEGE FOR WOMEN
THANJAVUR

2. CYCLOTRON OR MAGNETIC
RESONANCE ACCELERATOR

3. Introduction
• A cyclotron was one of the earliest particle accelerator.
• Invented by Ernest O. Lawrence in 1929- 1930
• It’s a device which is used to accelerates charged subatomic
particles in a constant magnetic field

4. Principle
• The charged particles acquire energy when they repeatedly
move through an alternating electric field along a spiral path.
• They move in a spiral path by a perpendicular magnetic
field.

5. Construction

6. • D shaped hollow semi-circular chambers, these are called
dees.
• This arrangement makes one dee positive and other negative
during one half cycle.
• An ion sources of positive ions, such as protons,deutrons,
alpha particles etc.
• A uniform magnetic field is applied perpendicular to the cross
sectional area of the dees placing them.

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