jimlux wrote:
Hal Murray wrote:
jim...@earthlink.net said:
The gas diffusing out through the drilled bolt.. sure it's drilled,
but the
conductance is so patheticaly low, you're literally waiting until
the gas
molecules happen to randomly bounce their wey up the hole.
I've never worked
In message 4c7f5918.7030...@xtra.co.nz, Bruce Griffiths writes:
Indicates that the operating pressure at the hydrogen dissociator is
likely to be a few Torr or so.
The pressure is basically: As low as possible in order to minimize
hydrogen collisions (other hydrogen, walls) as much as possible.
Poul-Henning Kamp wrote:
In message4c7f5918.7030...@xtra.co.nz, Bruce Griffiths writes:
Indicates that the operating pressure at the hydrogen dissociator is
likely to be a few Torr or so.
The pressure is basically: As low as possible in order to minimize
hydrogen collisions (other
Bruce Griffiths wrote:
Poul-Henning Kamp wrote:
In message4c7f5918.7030...@xtra.co.nz, Bruce Griffiths writes:
Indicates that the operating pressure at the hydrogen dissociator is
likely to be a few Torr or so.
The pressure is basically: As low as possible in order to minimize
hydrogen
Poul-Henning Kamp wrote:
In message 4c7f5918.7030...@xtra.co.nz, Bruce Griffiths writes:
Indicates that the operating pressure at the hydrogen dissociator is
likely to be a few Torr or so.
The pressure is basically: As low as possible in order to minimize
hydrogen collisions (other hydrogen,
Hi
Also to pump the beast clean after you have opened it up
Bob
On Sep 2, 2010, at 4:04 AM, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
In message 4c7f5918.7030...@xtra.co.nz, Bruce Griffiths writes:
Indicates that the operating pressure at the hydrogen dissociator is
likely to be
Hi
That pressure level pretty much rules out mechanical pumps for the operating
mode. A roughing pump would still be needed to get things going. It also takes
the level of machining on the fittings well beyond the reach of most machine
shops. Some of the stuff has to be exact, close to a
and frequency measurement time-nuts@febo.com
Subject: Re: [time-nuts] homebrew H maser
Poul-Henning Kamp wrote:
In message 4c7f5918.7030...@xtra.co.nz, Bruce Griffiths writes:
Indicates that the operating pressure at the hydrogen dissociator is
likely to be a few Torr or so.
The pressure
jim...@earthlink.net said:
The gas diffusing out through the drilled bolt.. sure it's drilled, but
the
conductance is so patheticaly low, you're literally waiting until the
gas
molecules happen to randomly bounce their wey up the hole.
I've never worked with vacuum gear.
I assume
Of J. Forster
Sent: giovedì 2 settembre 2010 18.59
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] homebrew H maser
jim...@earthlink.net said:
The gas diffusing out through the drilled bolt.. sure it's drilled,
but the conductance is so patheticaly low
-nuts] homebrew H maser
On Sun, 29 Aug 2010 10:03:02 -0700 (PDT)
J. Forster j...@quik.com wrote:
[snip]
complicating aspect is the self-tuning stuff for which several
strategies may be chosen.
I'd start here at getting a cavity that is resonant at the frequency
at all. Getting sub
-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Attila Kinali
Sent: Tuesday, August 31, 2010 12:13 PM
To: j...@quik.com; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] homebrew H maser
On Sun, 29 Aug 2010 10:03:02 -0700 (PDT)
J
On 9/1/2010 12:18 PM, Bob Camp wrote:
Hi
My guess is that you put the adjuster entirely inside the vacuum enclosure.
Pump the gizmo down, stabilize it, measure where it's at. Do some math, pop
it open move the adjuster x.xx turns. Step and repeat. Possibly have a fine
and a coarse
On 9/1/2010 3:30 PM, Chris Howard wrote:
Given the quality of vacuum the manual seems to imply, I'm guessing
this
wont cut it. I'll bet that even low impurity Teflon has a long
bakeout
period.
Too bad they don't have some kind of getter to allow lower vacuum
specs.
I expect they
Hi
You can get epoxies with very low outgassing numbers. Also you will be using
very little of it.
Bob
On Sep 1, 2010, at 3:28 PM, Oz-in-DFW li...@ozindfw.net wrote:
On 9/1/2010 12:18 PM, Bob Camp wrote:
Hi
My guess is that you put the adjuster entirely inside the vacuum enclosure.
J. Forster wrote:
If you try to cut corners with high vacuun technology, you will be
disappointed. Even with all new parts and carefull assembly, you will
almost certainly have to He Leak Detect the system to get it tight. I've
done this stuff. It is doable but certainly not trivial. And you
The combination of high vacuum and milliKelvin temperatures is far, far
worse.
-John
J. Forster wrote:
If you try to cut corners with high vacuun technology, you will be
disappointed. Even with all new parts and carefull assembly, you will
almost certainly have to He Leak
jim...@earthlink.net said:
The gas diffusing out through the drilled bolt.. sure it's drilled, but the
conductance is so patheticaly low, you're literally waiting until the gas
molecules happen to randomly bounce their wey up the hole.
I've never worked with vacuum gear.
I assume drilled
Hal Murray wrote:
jim...@earthlink.net said:
The gas diffusing out through the drilled bolt.. sure it's drilled, but the
conductance is so patheticaly low, you're literally waiting until the gas
molecules happen to randomly bounce their wey up the hole.
I've never worked with vacuum gear.
On Sun, 29 Aug 2010 09:51:46 -0700 (PDT)
J. Forster j...@quik.com wrote:
If you took a modern approach by using factory built test equipment as
building blocks (microwave synthesizer, lock-in amp, power supplies, etc)
and commercial vacuum components (pumps, valves, fittings, controllers,
On Sun, 29 Aug 2010 10:11:47 -0700 (PDT)
J. Forster j...@quik.com wrote:
I used to read Strong's book as bedtime reading.
And which book would that be, for those who have not read it?
Attila Kinali
--
If you want to walk fast, walk alone.
If you want to walk far, walk
On Sun, 29 Aug 2010 10:03:02 -0700 (PDT)
J. Forster j...@quik.com wrote:
[snip]
complicating aspect is the self-tuning stuff for which several
strategies may be chosen.
I'd start here at getting a cavity that is resonant at the frequency
at all. Getting sub-milimeter precision in
On Sun, 29 Aug 2010 16:26:05 -0400
Mark Kahrs mark.ka...@gmail.com wrote:
The Hahvahd physics dept. has all number of interesting papers.
For example there's Humphrey's
dissertation:www.physics.harvard.edu/Thesespdfs/humphrey.pdf
If you've ever wanted to make your own Rb cell, how about
Proceedures in Experimental Physics
-John
=
On Sun, 29 Aug 2010 10:11:47 -0700 (PDT)
J. Forster j...@quik.com wrote:
I used to read Strong's book as bedtime reading.
And which book would that be, for those who have not read it?
Attila Kinali
--
If
Questions like yours are what makes a good experimental physicist.
As to vacuum tight, you use bellows or put the inchworm inside the vacuum.
As to RF leakage, a waveguide below cutoff is one way. Another is to
design a choke seal, a 1/4 wave stub with a high Q cavity as the open end.
-Jhn
On Sun, 29 Aug 2010 13:27:13 -0700
Corby Dawson cdel...@juno.com wrote:
-The triple magnetic shields are VERY important. The first time I removed
the top
shield to access the RF section the Maser stopped oscillating! Replacing
the shield
restored oscillations!
Hmm.. i'd guess that the
--
Original Message
Date: Tue, 31 Aug 2010 18:06:38 +0200
From: Attila Kinali att...@kinali.ch
Subject: Re: [time-nuts] homebrew H maser
To: j...@quik.com, Discussion of precise time and frequency
measurement time-nuts@febo.com
Message-ID
. If anyone is interested, the link is
http://www.brightscience.com/
Francis
--
Original Message
Date: Tue, 31 Aug 2010 18:06:38 +0200
From: Attila Kinali att...@kinali.ch
Subject: Re: [time-nuts] homebrew H maser
To: j
...@quik.com
ReplyTo: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] homebrew H maser
Sent: Aug 31, 2010 09:21
Proceedures in Experimental Physics
-John
=
On Sun, 29 Aug 2010 10:11:47 -0700 (PDT)
J. Forster j...@quik.com wrote:
I used to read Strong's
time and frequency measurement
Subject: Re: [time-nuts] homebrew H maser
Sent: Aug 31, 2010 09:21
Proceedures in Experimental Physics
-John
=
On Sun, 29 Aug 2010 10:11:47 -0700 (PDT)
J. Forster j...@quik.com wrote:
I used to read Strong's book as bedtime reading.
And which
://www.brightscience.com/
Francis
--
Original Message
Date: Tue, 31 Aug 2010 18:06:38 +0200
From: Attila Kinali att...@kinali.ch
Subject: Re: [time-nuts] homebrew H maser
To: j...@quik.com, Discussion of precise time
--
Original Message
Date: Tue, 31 Aug 2010 18:06:38 +0200
From: Attila Kinaliatt...@kinali.ch
Subject: Re: [time-nuts] homebrew H maser
To: j...@quik.com, Discussion of precise time and frequency
measurementtime-nuts@febo.com
Message-ID:20100831180638.16e4c656
Thank you Bruce
This is very informative, not in my life time on ebay, but ground braking
for things to come.
Bert Kehren
In a message dated 8/29/2010 4:32:13 P.M. Eastern Daylight Time,
bruce.griffi...@xtra.co.nz writes:
http://tycho.usno.navy.mil/ptti/ptti2002/paper14.pdf
Bruce
On 08/29/2010 03:55 PM, Attila Kinali wrote:
Moin,
I had a little bit too much time at hand this weekend and read a bit
about H masers. I was quite astonished to see how simple these devices
actually are. The electronics are basically a simple matter these days
(thanks to the abundance of GHz
In message 4c7a6b01.3030...@rubidium.dyndns.org, Magnus Danielson writes:
On 08/29/2010 03:55 PM, Attila Kinali wrote:
It's a complicated field and several traps to fall into on the way. It
is a fairly sizeable project to attempt.
Well, as with so much else, it depends what the level of
On Sun, 29 Aug 2010 16:13:21 +0200
Magnus Danielson mag...@rubidium.dyndns.org wrote:
On 08/29/2010 03:55 PM, Attila Kinali wrote:
Does anyone know whether any of those people collected their results
somewhere? And if, where i could find them?
The physical package is definitely where most
On Sun, 29 Aug 2010 15:05:05 +
Poul-Henning Kamp p...@phk.freebsd.dk wrote:
In message 4c7a6b01.3030...@rubidium.dyndns.org, Magnus Danielson writes:
On 08/29/2010 03:55 PM, Attila Kinali wrote:
It's a complicated field and several traps to fall into on the way. It
is a fairly sizeable
If you took a modern approach by using factory built test equipment as
building blocks (microwave synthesizer, lock-in amp, power supplies, etc)
and commercial vacuum components (pumps, valves, fittings, controllers,
etc. in Conflat or something like it), you could likely build up most of a
system
In message 57157.12.6.201.2.1283100706.squir...@popaccts.quikus.com, J. Fors
ter writes:
In thinking about it, it would be a terrific project to run with LabView!
Rubbish, LabView would _never_ be able to do that.
PLEASE! Don't tempt me further!!
Ooops, sorry! :-)
Poul-Henning
--
J. Forster wrote:
If you took a modern approach by using factory built test equipment as
building blocks (microwave synthesizer, lock-in amp, power supplies, etc)
and commercial vacuum components (pumps, valves, fittings, controllers,
etc. in Conflat or something like it), you could likely build
[snip]
complicating aspect is the self-tuning stuff for which several
strategies may be chosen.
I'd start here at getting a cavity that is resonant at the frequency
at all. Getting sub-milimeter precision in tooling is quite easy
(given you have the tools and knowledge, or can pay someone
I used to read Strong's book as bedtime reading.
WARNING: There are few things more addictive than collecting:
Conflat Vacuum Fittings
Standard Taper Glassware
and worst:
Linos (Spindler Hoyer) MicroBench and NanoBench optical breadboarding.
BE WARNED!
-John
==
J. Forster
Do we know any thing about the Neuchatel design for Galileo?
Bert Kehren
In a message dated 8/29/2010 11:05:58 A.M. Eastern Daylight Time,
p...@phk.freebsd.dk writes:
In message 4c7a6b01.3030...@rubidium.dyndns.org, Magnus Danielson
writes:
On 08/29/2010 03:55 PM, Attila Kinali wrote:
In message 3e227.34d2ee82.39abf...@aol.com, ewkeh...@aol.com writes:
Do we know any thing about the Neuchatel design for Galileo?
Bert Kehren
There are plenty of papers about it.
They started out with an active design, and got it inside spec
(power/weight) but found that the performance was not
This is very true. Norman Ramsey built one out of aluminum. It was at
least 6 feet in diameter and 8 feet long, at a guess. When I frequented
that lab (mid-late 80s), it was too big to get it out the door room so had
shelves inside to store equipment. It was inside a giant wooden crate,
easily 10'
Poul-Henning Kamp wrote:
In message 3e227.34d2ee82.39abf...@aol.com, ewkeh...@aol.com writes:
Do we know any thing about the Neuchatel design for Galileo?
Bert Kehren
There are plenty of papers about it.
They started out with an active design, and got it inside spec
(power/weight) but found
jimlux wrote:
J. Forster wrote:
If you took a modern approach by using factory built test equipment as
building blocks (microwave synthesizer, lock-in amp, power supplies, etc)
and commercial vacuum components (pumps, valves, fittings, controllers,
etc. in Conflat or something like it), you
Any links to reading material, would be nice to learn what they did to get
a small package and how small is it?
Bert Kehren
In a message dated 8/29/2010 2:03:34 P.M. Eastern Daylight Time,
p...@phk.freebsd.dk writes:
In message 3e227.34d2ee82.39abf...@aol.com, ewkeh...@aol.com writes:
http://www.spectratime.com/product_downloads/PTTI_FCS_2005.pdf
ewkeh...@aol.com wrote:
Any links to reading material, would be nice to learn what they did to get
a small package and how small is it?
Bert Kehren
In a message dated 8/29/2010 2:03:34 P.M. Eastern Daylight Time,
The Hahvahd physics dept. has all number of interesting papers.
For example there's Humphrey's
dissertation:www.physics.harvard.edu/Thesespdfs/humphrey.pdf
If you've ever wanted to make your own Rb cell, how about this
one?cfa-www.harvard.edu/~dphil/work/coat.pdf
After keeping an old EFOS 2 H maser running the last couple or three
years here are a few bits of advice.
-The triple magnetic shields are VERY important. The first time I removed
the top
shield to access the RF section the Maser stopped oscillating! Replacing
the shield
restored oscillations!
http://tycho.usno.navy.mil/ptti/ptti2002/paper14.pdf
Bruce Griffiths wrote:
http://www.spectratime.com/product_downloads/PTTI_FCS_2005.pdf
ewkeh...@aol.com wrote:
Any links to reading material, would be nice to learn what they did
to get
a small package and how small is it?
Bert Kehren
In
Chuck Harris wrote:
jimlux wrote:
J. Forster wrote:
If you took a modern approach by using factory built test equipment as
building blocks (microwave synthesizer, lock-in amp, power supplies,
etc)
and commercial vacuum components (pumps, valves, fittings, controllers,
etc. in Conflat or
After keeping an old EFOS 2 H maser running the last couple or three
years here are a few bits of advice.
-The triple magnetic shields are VERY important. The first time I removed
the top
shield to access the RF section the Maser stopped oscillating! Replacing
the shield
restored
: time-nuts-boun...@febo.com
Date: Sun, 29 Aug 2010 16:39:42
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Homebrew H Maser
After keeping an old EFOS 2 H
Yes and no.
I watched while a cryogenic MASER experiment was done at Harvard.
First off, a H MASER built at Smithsonian Astrophysical Observatory, was
set up and a GPS set up as a comparison. This was late 1980s.
That MASER was used as a reference for a synthesizer which was swept a
Hertz two
On Sun, Aug 29, 2010 at 7:56 PM, Didier Juges did...@cox.net wrote:
I'll dig them up and see if anyone could host them on a website. (Files
are quite large!)
It would be great if you could upload these to the Manuals page at
www.ko4bb.com.
That would be great. If the files are really big
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