Stop Heating Your Vacuum Chamber Walls
When you’re trying to heat a wafer or substrate inside a vacuum, you want the energy to go one place: the part. But here’s the problem. Most systems suffer from “heat soak.” Instead of hitting the target, the infrared radiation just bounces around and soaks into the chamber walls. Not only is that a waste of power, but it makes the outside of your equipment dangerously hot. Nobody likes a machine that burns you just for touching the casing. That’s why we use directional infrared technology. How it actually works Think about a standard IR lamp. It throws heat in every direction—a full 360-degree blast. In a vacuum, you don’t have air to move that heat around through convection, so everything comes down to radiation. If you use a basic lamp, your chamber walls end up acting like a giant sponge for all that stray energy. We fix this by using reflectors and tuning the wavelength to focus the beam. It narrows the heat footprint. The result? The energy hits the part, and the walls stay cool. Simple as that. The hardware side of things We usually go with high-watt density quartz tubes. They’re great because they ramp up the heat fast. Plus, by using short-wave IR, the energy cuts right through to the substrate without messing with the surrounding atmosphere. But you have to be careful with your power density. Sure, a high-wattage lamp gets you to temperature quickly, but it puts a lot of stress on your power supply. If you crank the wattage too high without getting the reflector angle just right, you’re asking for trouble—like burnt-out filaments or nasty hot spots on your workpiece. Our best advice? Match the lamp length exactly to your target area. It stops the energy from leaking off the edges. Keeping things safe The best part about directional heating is the peace of mind. You don’t have to worry about an operator getting burned by the outer chassis because the heat stays trapped in a focused beam. It means you can ditch those bulky external insulation layers or those expensive water-cooling jackets that wrap around the whole chamber. You just wire it up, align your reflectors, and the heat goes exactly where it belongs.