Ron,
You may have run out of aluminum during the
deposition run, I have had that same problem. Are you using a shutter
?
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----- Original Message -----
Sent: Thursday, January 29, 2004 11:10
PM
Subject: Re: [VacuumX] IT WORKS
:)))))))))))))))))))))))))))))
Greetings James /
All,
Congratulations, interesting
enough I just coated my first telescope mirror, I was waiting to open the tank
when I read your post. This?was my 3rd attempt on this 8" after a couple
of dozen practice successes.?There are a few?pinholes and the
coating is a bit thin around the edges but all in all it looks good
considering I only used 1 tungsten.?
I think I deposited a bit of
tungsten over the aluminum or the aluminum foil may not be pure aluminum.
?The coating is a?very slightly?gold color?I ran the glow
discharge for 10 minutes after evaporating so I may have sputtered a bit of
stainless steel.
?
Any info would be greatly
appreciated.
?
Next step a rotating holder. I
have been playing with an ion beam source with only a little
success.
?
90 minutes isn¡¯t so bad try it
with a 2¡± air cooled diff pump I need close to 2 hours for a 24¡± diameter X
12¡± high tank. When I find a cheap valve I¡¯ll set up the 6¡± diff pump.
?
Dumb question # 2 is there any
advantage to backing the 6¡± diff pump with the 2¡±. Is the ultimate pressure
limited by the type of oil? ?Would
I get significantly faster pump rate at very low pressure? If I get the ion
beam source to work I¡¯ll need to suck the extra air out
quicker.
?
Yea I know I don¡¯t need Ion beams
but it¡¯s all for fun.
Any thoughts on a home made
E-Beam? It looks easy enough.
?
Later
Ron
WhiteJames Lerch
wrote:
Greetings
All,
Just came in from my first evaporation attempt and everything
went perfect! :)
I shot some images of the filament wiring, some more
glow discharge phenomenon,
and finally an image of the system evaporating
Al :)? Images available here:
Only
complaint at the moment is it takes 90 minutes to evacuate the
chamber!
Fortunately, this seems to make sense as the old small chamber
took 10 minutes,
the new chamber is ~9 times the volume, so it takes 9
times as long to
evacuate..
On the upside I think my bottle neck
is the little HVAC rough pump.? Perhaps it
is time to upgrade to a
real Rough pump :)
Take Care,
James Lerch
(My
telescope construction,testing, and coating site)
"Anything that can
happen, will happen" -Stephen Pollock from:
"Particle Physics for
Non-Physicists: A Tour of the Microcosmos"
" Press on: nothing in the
world can take the place of perseverance.
Talent will not; nothing is
more common than unsuccessful men with talent.
Genius will not;
unrewarded genius is almost a proverb.
Education will not; the world is
full of educated derelicts.
Persistence and determination alone are
omnipotent.
"
??????????????????????????????????????????????????????????
Calvin Coolidge
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