Active Acoustic-Magnetic Isolator (AAMI) prototype

Here are the specifications for the Active Acoustic-Magnetic Isolator (AAMI) prototype, organized for easy reference when ordering materials or beginning the build.

Core Material Requirements

Component	Quantity	Specification	Purpose
Mu-metal Sheet	5 m²	3 mm thickness	Magnetic shielding for low-frequency EM noise.
Lead Sheet	5 m²	5 mm thickness	High-density mass for seismic/acoustic damping.
Accelerometers	4 units	Tri-axial (High Sensitivity)	Feedback loop for real-time noise data.
Actuators	4-6 units	Piezoelectric Stacks	Active counter-vibration in the 5–25 Hz range.

System Architecture

• The "Shield Sandwich": You’ll be layering the 3 mm Mu-metal with the 5 mm lead. This composite creates a high-impedance barrier that handles both magnetic interference and physical kinetic energy (vibrations).

• The Feedback Loop: The four tri-axial accelerometers should be placed at the corners of the baseplate. They feed data into a controller that triggers the piezoelectric actuators to provide "counter-phase" movements, effectively canceling out environmental "hum" before it reaches the experiment.

• Performance Target: This setup is designed to achieve a 40% increase in the decoupling threshold, which is critical for isolating that 11.42 Hz signal from the background lab environment.

Assembly Note

When layering the Mu-metal, ensure the sheets are handled carefully to avoid dropping or bending them excessively, as physical stress can degrade their magnetic permeability. If you're doing any drilling, do it before the final annealing of the Mu-metal if possible, or use very sharp bits to minimize stress.