<Noxz>
Looks like the coil of the solenoid for the coolant line to the turbo is blown, or the valve itself may be stuck.. @ 24v it pulls half an amp, but it certainly looks burnt on the side, but I can easily blow through the valve without any power, and with power still can (maybe it is normally open, not closed? though that doesnt seem right)
<Noxz>
oh, Si actually has a higher electron affinity than Cu
<Noxz>
slightly
<Noxz>
just read up how a quarts microbalance works for detecting layer size of depositions, really neat
<Noxz>
old technology, but still neat
<Noxz>
OOoo, DOI: 10.1063/1.3292510
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<Noxz>
main downside to that paper is it really couldn't handle more than 500 C
<Noxz>
in part by the thermocouple and the Macor which is stable to 600 C
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<Noxz>
neat, so people just hack out the quartz part of a crystal/opscilator
<sync>
yeah, although the oscillator circuits used by qcbs are not too difficult
<Noxz>
yeah, openQCMB has crystals for liek $15 USD.. or $1.50 or even less for one you hack out yourself....
<Noxz>
would likely hack some out to start with
<Noxz>
but the idea of it being more or less "built in" to the shutter of a knudsen cell to detect the current rate of growth is interesting
<Noxz>
applied science and another kid basically explained how the balances/controllers work, and it's basically just a frequency counter that detects deltas
<Noxz>
some calibration required per crystal, but yeah
<Noxz>
crystal type
<Noxz>
super interesting
<Noxz>
that paper was also a decent read
<Noxz>
but I have a feeling (I know it) that I would need more than 1000 C, so finding the right heating wire is needed
<Noxz>
nichrome/knathal can get past that, not too much though
<sync>
the problem is the high capacitive loading due to the long coax but it is not too difficult
<sync>
nah, the sensor directly over the cell is not what you want
<sync>
it will not give you an accurate reading ime
<Noxz>
AlN has a MP of 2200 C
<sync>
we spent quite a while to get a good correlation between the sensor rate and the actual deposition rate
<Noxz>
and decomposes at 2517, heh
<SpeedEvil>
SiC is commonly available as heating elements
<Noxz>
hrmm
<SpeedEvil>
you don't need to get close to 2200C IIRC to make AlN
<Noxz>
yeah, I saw a few diff kinds
<Noxz>
well, there are other methods, but that is one of them
<SpeedEvil>
perhaps
<sync>
knudsen cells are not the right way to go imho
<sync>
there are huge issues with them
<Noxz>
LiF@~900 C is really what I am loooking at
<Noxz>
since it isnt soluble in anything
<sync>
like not being able to shut them off usually
<Noxz>
hence the shutters?
<sync>
if you want any meaningful capacity
<sync>
no
<sync>
well, yes, but no
<Noxz>
can't you just disconnect the power to the heating element?
<sync>
yes
<Noxz>
is that so difficult?
<sync>
but then you have a cracked crucible and the material in your chamber
<sync>
the problem is that due to the construction they will cool from the aperture
<sync>
which encloses the liquid
<Noxz>
oh, right
<Noxz>
sort of why you dont use a coil condensor in chemistry for refluxing
<sync>
we have so many issues with them, we just use them for stuff that sublimates
<sync>
or where we know that the ceramic can take the stresses
<Noxz>
ceramic crucible?
<sync>
yes
<Noxz>
are carbon crucibles good or no?
<sync>
you can use graphite
<sync>
but you need to figure out if your material goes into solution in it or the other way round
<sync>
our cells are heated with carbon bands
<sync>
but direct heating or electron beam evaps are the way to go
<Noxz>
I'm trying to make an electron gun here ;)
<Noxz>
what is the difference w/ direct heating?
<sync>
find me something to evaporate carbon with
<Noxz>
I am not sure I am following what you are saying..
<Noxz>
I have heard of mixing carbon with material to get it to heat faster
<Noxz>
say, in a microwave
<Noxz>
for heat xfer
<sync>
no, you cannot use direct heating to evap some materials as their melting temperatuer is just too high
<Noxz>
hrm
<sync>
the electron gun is the easiest part
<Noxz>
well, tungsten cathodes are simple
<Noxz>
but I want something more controllable later(earlier) on
<sync>
for electron beam heating it is all you will ever need
<Noxz>
yeah, and it may be really useful for that early on
<sync>
idk, our sem also just uses a tungsten filament, works well enough
<Noxz>
one of the initial goals is to make a SEM capable of writing a design to a PMMA photoresist
<Noxz>
so, I need to easily turn the electron beam on/off
<Noxz>
which apparently is not too easy with the tungsten heated wire
<Noxz>
the idea of electron beam evaptoration is nice, I wasnt really thinking about it before, not sure why not
<Noxz>
anywho, getting more hype with turbo in hand
<sync>
you can just defocus the beam enough to not expose your resist
<sync>
or turn the hv on and off
<Noxz>
heh, sure, but I've put too much thought and reading papers into this whole photodiode thing ;)
<sync>
sure, but I would just go the established way
<Noxz>
meh
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<Noxz>
does electron beam deposition work in most circumstances?wiki says some oxides dont work well
<sync>
in my experience it does work very well
<Noxz>
is sputtering faster than electron beam deposition?
<Noxz>
seems a heavy molecule like argonw ould be more effective at knocking stuff off than a small electron
<sync>
it all depends
<sync>
ebeam is commonly used for aluminizing plastic sheets
<sync>
at quite high pressures and high rates
<Noxz>
hrm, no cheap Tungsten filaments on ebay currently, atleast none I found
<Noxz>
make my own?
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<nmz787>
I thought not wanting to turn the beam off was why they have beam blankers
<Noxz>
blankers = shutters?
<Noxz>
the articles I read on using photodiode based electron guns stated one of the benefits was the ability to easily pulse
<Noxz>
I think the hard part is the ability to pulse, with, say, Tungsten
<Noxz>
vs just turning on/off a source 3.5v UV LED that shines onto the photodiode? easy
<Noxz>
about to go through the woods with the pupper.. bbl
<nmz787>
blanker is an electromagnet that pulls the beam off to the side of the mid-column, onto just a plate or something
<Noxz>
ah, right, okay... but what is the reason they need that? because they cant pulse/turn on/off their electron gun easily, right?
<Noxz>
thermionic emission seems like a joke to me
<Noxz>
because of that
<nmz787>
uh, I guess
<nmz787>
peoplelike things to be in steady state I guess