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this post was submitted on 26 Sep 2024
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To give some background on this, the huge magnetic field in an MRI machine is created by a superconducting magnet. A magnetic coil submerged in liquid helium that keeps it ultra cold has virtually no resistance, so the electricity can keep going round and round and round like a racetrack without being bled off by resistance. This lets the machine maintain a very high magnetic field with very little power input.
An MRI technician can gradually ramp up or down the magnetic field power by slowly adding or removing current from the magnet. To retrieve the officer's rifle, they could have slowly ramped down the power with a magnetic power supply while the magnet stayed cold.
When the guy slams the emergency button that does what's called a quench. It adds resistance to the magnet, which starts turning that power into heat, and that heat boils off all the liquid helium and rapidly ramps the magnet down to zero. This should only be done if for example a patient is trapped in the machine by a metal object or similar emergency, because it damages the magnetic coil and also boils away the liquid helium, which itself is worth thousands of dollars.
LAPD (or more specifically, the California taxpayers) are in for a pricey repair bill.
"Should" be in for a pricy repair bill.
Unfortunately there's a lot of precedent, up to and including loss of life, where the police "cannot be held accountable because it might impact their ability to do their duty in the future."