Fast magnetic coil controller for cold atom experiments

Area of Science:

• Atomic Physics
• Experimental Physics
• Quantum Control

Background:

• Cold atom experiments rely on magnetic fields for precise control of atomic samples.
• Rapid magnetic field switching is crucial for many experimental protocols.
• Conventional power supplies limit the speed of magnetic field transitions due to slow current response.

Purpose of the Study:

• To develop a novel electronic circuit for faster magnetic field switching in cold atom experiments.
• To overcome the limitations of conventional power supplies in achieving rapid current changes in magnetic coils.
• To enhance the control capabilities in experiments requiring dynamic magnetic field manipulation.

Main Methods:

• Implementation of a custom electronic circuit designed to provide on-demand high voltage pulses.
• Utilizing the circuit to supplement a conventional power supply when rapid control signal variations occur.
• Testing the circuit's performance with a specific magnetic coil (491 μH inductance, 0.26 Ω resistance).

Main Results:

• Achieved a full-scale current transition in approximately 31 μs for a -1 to 1 A range.
• Demonstrated an effective bandwidth of 15.2 kHz, a significant improvement over standard methods.
• Obtained a switching speed and bandwidth enhancement factor of over 20 compared to conventional power supplies.

Conclusions:

• The developed electronic circuit effectively overcomes the switching time limitations of conventional power supplies for magnetic coils.
• This technique enables significantly faster and more precise magnetic field control in cold atom experiments.
• The circuit's parameters are tunable, allowing customization for various inductive and power requirements in scientific applications.