Archived - European Fusor

Current images of fusor efforts, components, etc. Try to continuously update from your name, a current photo using edit function. Title post with your name once only. Change image and text as needed. See first posting for details.
User avatar
Werner Engel
Posts: 145
Joined: Sun Aug 18, 2013 3:51 pm
Real name: Werner Engel
Location: Vienna, Austria
Contact:

Archived - European Fusor

Post by Werner Engel » Mon Jun 16, 2014 6:28 pm

This is the actual status of the preparation for my Fusor Experiment:

4) On the left you see the Turbo Control Unit Pfeiffer DCU. It generates up to 1500 Hz to drive the Turbo-Pump. On the backside it has a RS485 Interface which will be connected to my LABVIEW PC showing actual current (and therefore gas load). I think I will try to close the leaking valve if the gas load goes to high – during massive changes of pressure values. But this is not working yet.
On the right you see the Pfeiffer MFC unit. It’s connected to the vacuum gauge on one side and to the electric leak valve on the other side. The serial interface will be used to do automated changes in vacuum – to measure focus behavior in different gas concentrations.
It works very well. You can set a new value (say 5,0 x 10-4 mbar) and a few minutes later it arrives at the programmed vacuum!

3) This shows the 2 stage Pfeiffer Rotary Vane Pump used as backing pump. It does 8 m³/h and easily reaches 10-3 mbar and sometimes down to 10-4 mbar. Behind the rubber hose (which goes to the exhaust) there is a small manual venting valve which is used at the end of the venting process to go from 1mbar to atmospheric pressure. Air is only used as a venting gas for the roughing pump side as it contains too much water.
The fittings are all from VACOM (a German company which is quite cheap and fast in delivery) – designed in DN16. DN16 is good enough for these vacuum regions. The Turbo side uses DN63 and DN40 (with copper and Viton gaskets) – some in CF and some in KF. I bought the turbo in CF so I can use it for other purposes too and resell it easier – if wanted.
The mechanical vacuum gauge is used to check if the chamber is ready to be opened – as sometimes the pirani cold cathode gauge shows >1000mbar even it hast not reached 300 mbar!! Don’t know why. This is still under investigation.

2) This metal hose was first used as a connection between the chamber and the Turbo. It is DN40 with CF on both sides. Unfortunately this was no good idea: The hose was reducing its length (of course) and almost destroyed everything as it pulled the turbo and the chamber very close together, bending the mounting braces. I will never use such large metal hoses again!!

1) The HV-Feedthrough: DN 100 CF, 70 kV, 6.5A. A massive piece (6,5 kg) of vacuum equipment!
Also from VACOM.

During the last tests I went down to 10-6 mbar without any problem. I used Helium for venting and also to leak gas inside through the MFC. Next step will be high-voltage – where I go a very different way than everyone else in the forum. We will see …
Werner

PS: Sorry for the reverse order of the Picture, but inserting files did not work as I thought.
Attachments
IMG_3875.jpg
IMG_3874.jpg
IMG_3878.jpg
IMG_3879.jpg

User avatar
Richard Hull
Moderator
Posts: 11427
Joined: Fri Jun 15, 2001 1:44 pm
Real name: Richard Hull

Re: European Fusor

Post by Richard Hull » Tue Jun 17, 2014 6:22 pm

Nice beginning. I notice the lab aluminum framework. Not cheap, but if on hand, a real good framework. I found a bunch of that custom material at a local junk yard and purchased it at the pound scrap rate. I may use some of it on a future project in my lab. All the best on your effort.

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

User avatar
Werner Engel
Posts: 145
Joined: Sun Aug 18, 2013 3:51 pm
Real name: Werner Engel
Location: Vienna, Austria
Contact:

Re: European Fusor

Post by Werner Engel » Wed Jun 18, 2014 8:56 am

The aluminium framework consists of REXROTH components. I constructed it myself and had it prepared by a local company.
Rexroth also provides a free CAD application which you can use to construct your own thing - whatever it looks like: http://www.boschrexroth.com/en/xc/produ ... tpro/index

I like it very much because I can change everything and extend the whole thing on demand. It is extremly stable and can carry a few hundred kg!!

One thing which should be mentioned:
I found it extremly difficult to choose the right material, devices, fittings, ways of construction, valves for the fusor out of the gigantic pool of manufacturers. E.g.: If you ask a vacuum company for a turbo-pump, you have to know what you need. Deciding which parameter is necessary and which is optional is the hard work! And investing 5.000$ in the wrong pump was not the kind of investment I liked! Or does it have be a turbo which costs 45.000$? On the other side, this was the challange I liked most!
I also asked some very skilled professionals (researchers from universities, quantum physicist, nuclear physicist, ...) and nobody new everything.
The worst issue for me was choosing the right fitting system: KF, ISO, ISO-KF, CF, QCF, ...
WIthout knowing the exact pros/cons from every system, this was very hard. Everyone I asked preferred a different system and I didn't know how the parts really looked like! Not mentioning the inch/centimeter and compatibility issue.
Or the vacuum gauge: I had to read every datasheet 3x. Compare the product to a similar one from an other manufacturer. But which features do you have to compare? So I had to learn the theory behind the different measuring methodes - also from books which are not at the same actuality as the products sold today.
But - its still a lot of fun!!

Werner

User avatar
Andrew Robinson
Moderator
Posts: 682
Joined: Sun Aug 11, 2013 5:54 am
Real name: Andrew Robinson
Location: Raleigh, North Carolina
Contact:

Re: European Fusor

Post by Andrew Robinson » Wed Jun 18, 2014 3:14 pm

Richard Hull wrote:Nice beginning. I notice the lab aluminum framework. Not cheap, but if on hand, a real good framework. I found a bunch of that custom material at a local junk yard and purchased it at the pound scrap rate. I may use some of it on a future project in my lab. All the best on your effort.
Werner Engel wrote:The aluminium framework consists of REXROTH components. I constructed it myself and had it prepared by a local company.
Rexroth also provides a free CAD application which you can use to construct your own thing
You can say that again Richard! I have a love hate relationship with my aluminum extrusion of choice (80/20). I have used it for years and at times it is unbearably expensive, but I can never bring myself to not use it. I highly encourage you to give it a try in the future. It is extremely helpful.

If you can stomach the license, SolidWorks is also very VERY useful as a CAD platform. Some will disagree, but I feel it is the most intuitive and powerful CAD platform out there in use today. Most newer equipment and parts from reputable engineering firms will have SolidWorks part files on hand to aid in your assemblies. For example, almost all of McMasters selection is available for download as a sldprt file. Other resources include http://www.3dcontentcentral.com/ where you can find CAD files for MANY vendors including 80/20. Everything I design is first done in CAD including mechanical and thermal simulations where necessary. I LOVE SOLIDWORKS!

Nice work too Werner! Looking forward to see how things turn out for you!
Capture.PNG
80/20
Capacitor.PNG
More 80/20
I can wire anything directly into anything! I'm the professor!

Philipp W
Posts: 19
Joined: Sat Mar 23, 2013 3:03 pm
Real name: Philipp Windischhofer
Location: Grein, Austria

Re: European Fusor

Post by Philipp W » Wed Jun 18, 2014 3:56 pm

Very clean and professional setup, Werner!

That feedthrough of yours is truly massive! Do you already have plans for the vacuum chamber; are you going for a standard spherical setup or a larger cylindrical tank (probably more flexible and necessary (??) to accommodate the feedthrough)?

Can't wait to see the thing in real life ;)

Philipp

User avatar
Noah C Hoppis
Posts: 56
Joined: Sat Dec 22, 2012 9:05 pm
Real name: Noah C Hoppis

Re: European Fusor

Post by Noah C Hoppis » Sat Jun 21, 2014 5:54 am

I can completely back up Andrew's assessment of solidworks if you can afford it or get through a local school it is the best (IMHO) CAD software out there!
"No missile ever flew before 10 pm"

User avatar
Werner Engel
Posts: 145
Joined: Sun Aug 18, 2013 3:51 pm
Real name: Werner Engel
Location: Vienna, Austria
Contact:

Re: European Fusor

Post by Werner Engel » Sun Jul 06, 2014 9:41 am

This is the Turbo pump. A brand new Pfeiffer HiPace 80, with 48 Liters/sec for hydrogen.
It can reach 5x10e-10 mbar - connected via the DN 63 CF-F flange.
The external aircooling is not realy used as the gasload ist not so high.

I reduced to KF40 using a elbow valve which works fine for this use.
The metall pipes (KF40) are stable and do not move anymore (like the flexible steel hose).

Please be carefull: The turbo needs to be mounted much tighter as shown on the picture, as torques round 600Nm can be measured during a crash.

Regarding the Rexroth aluminium bars: I found them used at some experiments I made durnig my visits at CERN, DESY and the Tokamak in Garching.
If you are interested in such photos, please reply.
Attachments
HiPace 80.jpg

User avatar
Werner Engel
Posts: 145
Joined: Sun Aug 18, 2013 3:51 pm
Real name: Werner Engel
Location: Vienna, Austria
Contact:

Re: Archived - European Fusor

Post by Werner Engel » Sat Nov 01, 2014 10:13 am

The 70 kV HV feedthrough in it's parking position, resting on the ISO-KF flange. I used a Lab-Boy with a hole in the top-table to let the electrode go through the table.
It will be connected to the DN100 ISO-KF doublecross shortly!
Attachments
IMG_7285.jpg
IMG_7284.jpg

User avatar
Andrew Robinson
Moderator
Posts: 682
Joined: Sun Aug 11, 2013 5:54 am
Real name: Andrew Robinson
Location: Raleigh, North Carolina
Contact:

Re: Archived - European Fusor

Post by Andrew Robinson » Tue Nov 04, 2014 4:35 pm

Beautiful insulator. Ha! You really do have to be an old HV guy (or possibly fusor guy) to get exited like that over insulators. Don't let it topple over :X What was the price point on that guy? Looks like they're not listed online. I was originally headed down that same path. Looks like I'll be pulling some old Tesla strings though and constructing my own this time around. Still curious on price though as a backup option. Excellent work! Coming together really nice.
I can wire anything directly into anything! I'm the professor!

User avatar
Werner Engel
Posts: 145
Joined: Sun Aug 18, 2013 3:51 pm
Real name: Werner Engel
Location: Vienna, Austria
Contact:

Re: Archived - European Fusor

Post by Werner Engel » Tue Nov 04, 2014 6:00 pm

I bought it about a year ago for about 1.400€.
They still have it on stock, you have to ask for it. The 100kV is about 3250€.

BR,
Werner

Post Reply