semiconductor folks!

[xeno@hexokina.se]

@whitequark@social.treehouse.systems it’s used for loads of things, as a carrier gas, for cooling, and the main way to find leaks in an ultra high vacuum system (of which fabs have loads) is by spraying helium around the outside and looking for helium that makes it inside

there’s probably plenty of other uses I’m just ignorant of

[whitequark@social.treehouse.systems]

@xeno do you work in the industry?

[azonenberg@ioc.exchange]

@xeno @whitequark yeah but leak detection can't be a high volume use compared to actual production work. Like how often do tools develop leaks if you're not actively working on them?

[xeno@hexokina.se]

@whitequark@social.treehouse.systems oh nope sorry I didn’t parse “semiconductor folks” as people in the industry

I have been doing smal-scale semiconductor research work and I’ve learned from some actual semiconductor people but I am def not one of them

[azonenberg@ioc.exchange]

@xeno @whitequark i would expect most leaks to be after maintenance outages then the tool runs leak free for a comparatively long time

[xeno@hexokina.se]

@whitequark@social.treehouse.systems oh nope sorry I didn’t parse “semiconductor folks” as people in the industry

I have been doing small-scale semiconductor research work and I’ve learned from some actual semiconductor people but I am def not one of them

[whitequark@social.treehouse.systems]

@xeno oh no research definitely counts

do you know how much helium is used as a carrier gas? cooling in ESC/BSG systems seems to be "few sccm" which is not a geopolitically relevant amount, neither is leak checking

[xeno@hexokina.se]

@whitequark@social.treehouse.systems @azonenberg@ioc.exchange that’s true,

I know people in other labs with UHV stuff who have had to install He recycling systems and stuff over the past couple years to deal with the shortage but they might have some niche use for lots of He they never told me about, I was just thinking of “things that use He”

[psistarpsiii@tacobelllabs.net]

@whitequark I think it may be used in some plasma etch processes. Dry etching is basically sorcery

[xeno@hexokina.se]

@whitequark@social.treehouse.systems I think it varies a lot, I can look up our uni’s rie system that uses He bsg

the other thing with bsg systems is some of them don’t necessarily need He, it’s just optimal given thermal conductivity and inertness. Most bsg systems I know about can also use Ar or N2, but the thermal conductivity probably precludes their use in intense ion milling and stuff.