John F.,
The Palladium valve is also known as a palladium leak or a palladium
purifier. In the Maser the use is as the leak. It would also serve to
purify the H2 BUT any other impurities lodge in the Palladium plug and
can eventually cause it to fail. Early symptoms manifest as having to
heat
Higher operating temperatures force the use of nickel alloy to replace
the silver palladium alloy traditionally used.
At higher operating temperatures (40c and above) its not possible to
turn off (without cooling it) the palladium leak.
The Russian masers use nickel or nickel alloy instead of
Reference for palladium-silver leak difficulty at high temperature.
http://tycho.usno.navy.mil/ptti/1988/Vol%2020_10.pdf
Bruce
Bruce Griffiths wrote:
Higher operating temperatures force the use of nickel alloy to replace
the silver palladium alloy traditionally used.
At higher operating
If your serious, the disassociator splits the hydrogen molecules H2
into atoms H to allow maser operation. I do have an old Interocitor
screen I could mount on top of the Maser. It would look kinda neat!
Oh Corby, you are a man of true wit. I love it
Hadley
A fine is a tax for doing
This EFOS maser typically runs with the two vacuum pressures below 1.5 X
10-6 Torr. (as measured via the ion pump current)
Maximum should not exceed about 3.6 X 10-6 Torr for either pump.
The internal vacuum will drop to about 1 X10-7 Torr if the Hydrogen to
the disassociator is turned off.
One
John F.,
The Palladium valve is also known as a palladium leak or a palladium
purifier. In the Maser the use is as the leak. It would also serve to
purify the H2 BUT any other impurities lodge in the Palladium plug and
can eventually cause it to fail. Early symptoms manifest as having to
Back to the Palladium plug for a minute. The problem you mentioned about
the valve not shutting off completely is analogous to the problem with
HeCd LASERs.
In a HeCd LASER, there is an oven with Cd metal in it that is heated to
provide Cd ions to the discharge tube. There is also He in the tube.
On Sep 2, 2010, at 10:28 AM, Corby Dawson wrote:
This EFOS maser typically runs with the two vacuum pressures below 1.5 X
10-6 Torr. (as measured via the ion pump current)
Maximum should not exceed about 3.6 X 10-6 Torr for either pump.
The internal vacuum will drop to about 1 X10-7 Torr
Two things helped a lot: Big pumps and an LN2 cold trap.
The LN2 trap (as long as it is kept filled) will condense most everything
except a few permanent gases. It also stops the backflow of pump oil.
However, if something goes wrong, you would not believe the mess.
A technician that worked for
With the triode pumps you only need the vacsorbs for roughing, as they
will start at a higher pressure!
I have changed two ion pumps so far and only used the vacsorbs to get
back in operation.
The vacsorbs and accessories were eBay buys over a period of a few months
and very reasonable compared
At 01:17 PM 9/2/2010, Mark J. Blair wrote:
Back in college, I took a semiconductor device physics course which
included a lab where we made simple ICs (the most complex devices
were SR latches). We had a vapor deposition system for plating on
gold or aluminum, which pumped the chamber down
On Sep 2, 2010, at 12:00 PM, Scott Newell wrote:
I think I took that same class (sub-basement of Steele, right?) just a few
years after you.
That would be the one! See, I knew that most anybody who attended that
particular institution would recognize my description of that piece of
Mark J. Blair wrote:
On Sep 2, 2010, at 10:28 AM, Corby Dawson wrote:
This EFOS maser typically runs with the two vacuum pressures below
1.5 X 10-6 Torr. (as measured via the ion pump current)
Maximum should not exceed about 3.6 X 10-6 Torr for either pump.
The internal vacuum will drop to
is $$$) there
are a lot of very good, high precision parts just begging to be hacked.
- Original Message -
From: jimlux jim...@earthlink.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Friday, September 03, 2010 12:34 AM
Subject: Re: [time-nuts] Maser info (vacuum
...@earthlink.net
To: j...@quik.com; Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Friday, September 03, 2010 12:45 AM
Subject: Re: [time-nuts] Maser info (vacuum levels)
J. Forster wrote:
Two things helped a lot: Big pumps and an LN2 cold trap.
The LN2 trap (as long
Heathkid wrote:
Sounds like the parts of a salvaged SEM would be a good start for a
project such as this (assuming the diffusion pump is included - I've
been looking for one for a while but it seems the pumps are almost
*always* missing). But still, if you could find one locally (freight is
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