Steves two favorite beam dumps.
Both invented by others.
Believe it or not, a stack of single sided steel razor blades enclosed in a small box. The very sharp knife edges diffract the light and stainless steel is actually quite good at adsorbing. Takes massive amounts of power, very well. Just one blade on top of another, and clamped together. Somebody had a now expired patent on this.
Poor mans beam dump #2, a sort of DMills variation.
Only I use a carbon rod from a welding shop for the 45' piece.
You grind the graphite on a grinder, gives it a nice rough surface,
but makes one heck of a mess if your not careful!
Professional ones tend to use a series of blackened disks mounted in a long tube, often with fins or water cooling. There is a hole in the center of each disk, and a solid scatterer at the end: If you space the disks far enough apart, you have baffles. Usually the hole in the disks gets bigger at the back.
Graphite rods get shaped with a grinder, chuck the rod in a drill if you want a cone.
Flat graphite plates come from glassblowing places like WALE Apparatus Co.
Steve
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Qui habet Christos, habet Vitam!
I should have rented the space under my name for advertising.
When I still could have...