Low-cost Josephson Junction Array
Does anyone know where I can get a JJA at very low cost? It does not have
to be the "programmable" type-- it would be OK if it only produces a single
voltage, e.g. 10V or 1V.
I was looking at the ETL of Japan-- they have one based on Titanium (or
something) that works at slightly higher temperatures, and makes 1V-- so
good for liquid helium or a cryo-cooler (but not liquid nitrogen).
Where in the world do I get one of these things? How much does it cost?
Ideas anyone?
-Ken
In message CAMadRMYCOeiCKA=XPS4LP9DMT6RtkD_FuKFZKX9Qeo5MNktpbQ@mail.gmail.com
, Ken Peek writes:
Where in the world do I get one of these things? How much does it cost?
I belive NIST is still the major manufacturer in the market.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
Hi Ken;
I am not sure what amount is reasonable. The NIST Programmable JJA system is around 400K and has accuracy of near 10 x -12.
A number of the system components are available on the used market, and I cannot speak for NIST, but perhaps they would work with you if you sourced those components used. If that was an option you could bring the cost down substantially. Please feel free to contact me with any other question.
Cheers;
Thomas Knox
Sr Test and Measurement Engineer
Quantum Voltage Group
Quantum Electromagnetics Division
NIST
325 Broadway
Boulder Colorado 80305
1-303-554-0307
tom.knox@nist.gov and actast@hotmail.com
From: volt-nuts volt-nuts-bounces@febo.com on behalf of Ken Peek ken.peek@diligentminds.com
Sent: Wednesday, October 19, 2016 12:30 PM
To: volt-nuts
Subject: [volt-nuts] Low-cost Josephson Junction Array
Does anyone know where I can get a JJA at very low cost? It does not have
to be the "programmable" type-- it would be OK if it only produces a single
voltage, e.g. 10V or 1V.
I was looking at the ETL of Japan-- they have one based on Titanium (or
something) that works at slightly higher temperatures, and makes 1V-- so
good for liquid helium or a cryo-cooler (but not liquid nitrogen).
Where in the world do I get one of these things? How much does it cost?
Ideas anyone?
-Ken
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Hi Paul;
I think there are some other manufactures and I have even seen several used systems in various states of disrepair on eBay over the past few years.
But I think the NIST system probably represents a real value since the system price does not fully represent all the research and development dollars spend reaching the current state of the art system what would be added to a privately developed system. If anyone does ever have an interest I would be glad to direct them to the correct person to answer technical or pricing questions. I am also glad to find and post answers through the Volt-Nut form regarding our research since the progress of science is a major part of our mission.
Cheers;
Thomas Knox
NIST
From: volt-nuts volt-nuts-bounces@febo.com on behalf of Poul-Henning Kamp phk@phk.freebsd.dk
Sent: Wednesday, October 19, 2016 12:37 PM
To: Discussion of precise voltage measurement; Ken Peek
Subject: Re: [volt-nuts] Low-cost Josephson Junction Array
In message CAMadRMYCOeiCKA=XPS4LP9DMT6RtkD_FuKFZKX9Qeo5MNktpbQ@mail.gmail.com
, Ken Peek writes:
Where in the world do I get one of these things? How much does it cost?
I belive NIST is still the major manufacturer in the market.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
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www.febo.com
volt-nuts is a low volume, high SNR list for the discussion of precise voltage measurement and related topics. To see the collection of prior postings to the list ...
and follow the instructions there.
On Wed, Oct 19, 2016 at 1:30 PM, Ken Peek ken.peek@diligentminds.com
wrote:
Where in the world do I get one of these things? How much does it cost?
Ideas anyone?
Well, you asked for it.
I might humbly suggest the responses are going to flow in two directions.
One direction is like the old amateur scientist column in scientific
american where heroic achievements are glorified for eternity even if they
don't accomplish real economically valuable work.
The other is something like professional railroad men trying to dissuade a
home machinist from trying to build a full size replica of a Union Pacific
4-8-8-4 because its going to be quite complicated and expensive and large
and even the professionals find it a bit difficult so go back to watching
Oprah Show reruns on TV.
In the spirit of I just want a hand held steam engine that spins a wheel
and chuffs a bit, in my infinite spare time I've been thinking/working on
replicating the work from this URL at home:
http://labs.physics.berkeley.edu/mediawiki/index.php/Josephson_Junction
I certainly have the RF gear. I have marginally adequate measurement
gear. I have access to a machine shop (my own, although I have no niobium
experience...). There's always a problem and for me its sourcing liq He
and using it my lab without asphyxiating myself. I do not have the
cryogenic lab gear (or experience) that I need to pull this off safely. So
in typical home hobbyist style I have an infinite dependency chain where
I'm sorta trying to get some liq N2 experience on another separate project
so that someday I can cluefully use liq He. I have some professional
training with energetic materials so I'm not worried about the safety and
discipline aspects of cryonics, or rephrased I know what to be worried
about and how to protect against stuff thats more fun than I can
find/afford to buy. At some point in my life I will run that lab in my
basement but I can't even predict a year much less a date.
I think its a fun project because it marries so many unique experimental
lab skills.. measurement electronics, precision machining, modest power
microwave RF, exotic materials, cryonics... It really is, in many ways,
the masterpiece of home science experiments.
I'm honestly not sure that liq He is something that can be done at home.
It may simply not be possible.
So your desire for a home JJ is not unique although frankly I have so far
to go with my cryonics learning and gear that I'm not far ahead of you!