Single radio frequency bucket injection in the 88-Inch Cyclotron using a pulsed high voltage chopper

Area of Science:

• Nuclear Physics
• Particle Accelerators

Background:

• Cyclotrons are particle accelerators that use magnetic fields and electric fields to accelerate charged particles.
• Understanding the injection dynamics is crucial for optimizing beam quality and extraction efficiency.

Purpose of the Study:

• To confirm single radio frequency (RF) bucket injection into the 88-Inch Cyclotron.
• To simplify complex cyclotron dynamics by relating them to a conceptual transfer function.
• To validate the injection method through specific operational modes and observations.

Main Methods:

• Utilized a fast chopper in the axial line to fill a single RF bucket.
• Operated the cyclotron in the third harmonic mode for confirmation.
• Observed the extraction process to detect the presence or absence of intermediate bunches.

Main Results:

• Successfully demonstrated single RF bucket filling and acceleration.
• Observed extraction as a train of bunches, consistent with multi-turn extraction.
• Confirmed single bucket injection by the absence of intermediate bunches in the third harmonic mode.

Conclusions:

• The study successfully confirmed single RF bucket injection in the 88-Inch Cyclotron.
• This finding simplifies the understanding of cyclotron dynamics and its transfer function.
• The method provides a clearer picture of particle acceleration and extraction processes.