This just in from the United Kingdom: Three Badass water cooled power supplies from a decommissioned Cray supercomputer.
From the auction details:
Brown Applied Technology high power switched-mode PSU with PFC (Power Factor Correction). This power supply was developed for use in demanding computer applications where performance and reliability are of utmost importance.
Key characteristics of this PSU are the extremely fast load response and small voltage deviation. The unit is fitted with a water cooled base plate and a double-sided “spade” style output connection. It is possible to remove the base plate and replace with an air cooled heatsink.
Please note: Ex-equip, good condition. BUT some surface corrosion (mildew) from storage. Clean on the inside, it’s just the outer casing that is affected. Removed from a Cray super computer. Supplied with pin-out for front-panel control/interface connector. Tested, good working order, not DOA.
Applications could include:
High power laser diodes, Battery charging, Heating, Spot welding, electroplating.
If you need more than 3.3V, you can put two of them in series for up to 6.6V, or four for 13.2V !
Specifications:
Output voltage: 3.3V (adjustable)
Output current: 400A
Slew rate 200A/uS (80% step)
Step response <70mV for 320A step
Auxiliary output: 12V 0.6A
Input voltage: 200-240V, 50-60Hz, PFC
Input current 12A
Remote sensing
Remote enable
Water cooled base plate fitted
Weight: 8kg
Look at the size of that power out bar. And here is the pinout:
Prometheus Fusion Perfection 
Looks like you have your SC coil power supply. You may need to mod it for constant current. Get a schematic.
Hope they are useful for something! I found them looking for a power supply for the laser diodes which are 3.5V 90A. They struck me as exceptional power supplies especially for the price. 400Amps! That’s serious current. With 3 units I can hit 3.3V, 6.6V and 9.9V.
Sweet! Those should work for your laser diodes.
Olivia, would these laser diodes require current limiting? Like how you have to use a resistor with an LED.
Yes, I would advise that. We usually have our electronics shop people wire us up a simple circuit for that. Do you have the power lines yet? You need pretty heavy duty gauge wire to handle the DC current. But #4 AWG is a huge pain to route. They make braided wire that can handle the current, though. It’s much easier to work with.
Whoa! This power supply was made by my uncle Allan.
Funny the things you run into late at night reading about fusion…