Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
-
- Posts: 209
- Joined: Thu Mar 05, 2009 1:49 pm
- Real name:
Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
Cleaned things up somewhat, and got more beam out - going to keep dialing it in.
RT
RT
-
- Posts: 209
- Joined: Thu Mar 05, 2009 1:49 pm
- Real name:
Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
Dialded in on H mode, and am pulling proper beam now. Some pics and videos of operation:
https://youtu.be/Jx0ts2VmjHs
https://youtu.be/mu_XNZKC0aw
RT
https://youtu.be/Jx0ts2VmjHs
https://youtu.be/mu_XNZKC0aw
RT
- Garrett Young
- Posts: 123
- Joined: Fri May 26, 2006 9:51 pm
- Real name: Garrett Young
Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
Robert,
Now this is a really cool project! I've watched this thread with great interest. Is the Northwest Nuclear Consortium open to visitors?
I'm trying to pull together a midwest conference for fusor.net members (viewtopic.php?f=47&t=11408). I know you are well outside the midwest but do you ever travel to this area? You would certainly be welcome as a guest speaker.
Now this is a really cool project! I've watched this thread with great interest. Is the Northwest Nuclear Consortium open to visitors?
I'm trying to pull together a midwest conference for fusor.net members (viewtopic.php?f=47&t=11408). I know you are well outside the midwest but do you ever travel to this area? You would certainly be welcome as a guest speaker.
- Garrett
-
- Posts: 209
- Joined: Thu Mar 05, 2009 1:49 pm
- Real name:
Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
Thanks Garrett,
With regards to the invite out east, thanks also. I can't say I'm out there very often, but I'm likely to be at HEAS this year, I'll be certain to say hello if I see you there.
I haven't been affiliated with NWNC for several years, and admins haven't been responsive to my request to edit the thread of it's mention. The system resides with me now, as it should.
RT
With regards to the invite out east, thanks also. I can't say I'm out there very often, but I'm likely to be at HEAS this year, I'll be certain to say hello if I see you there.
I haven't been affiliated with NWNC for several years, and admins haven't been responsive to my request to edit the thread of it's mention. The system resides with me now, as it should.
RT
Last edited by RobertTubbs on Sat May 06, 2017 1:20 pm, edited 3 times in total.
- Garrett Young
- Posts: 123
- Joined: Fri May 26, 2006 9:51 pm
- Real name: Garrett Young
Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
Understood. I was really interested in seeing your device first hand and discussing ideas. Hopefully I'll be at HEAS this year.
- Garrett
-
- Posts: 209
- Joined: Thu Mar 05, 2009 1:49 pm
- Real name:
Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
You're welcome to drop by Seattle sometime and see it, it's in my living room. Otherwise wait about a year and visit the Philippines as I'll be there studying abroad for a few years and my most of my hardware but for the most extreme of export restricted materials will come with. My couch there will be open to to surfing, unless I'm out surfing.
- Steven Sesselmann
- Posts: 2128
- Joined: Wed Aug 10, 2005 9:50 pm
- Real name: Steven Sesselmann
- Location: Sydney - Australia
- Contact:
Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
Robert,
Can you elaborate more on the physics of plasma going into "H" mode?
I have seen this phenomenon myself or at least something similar while playing around with an induction coil and a neon tube, as the neon tube was held close to a high frequency induction coil the tube lights up but at some point the plasma goes from being just normal "neon tube bright" to something more like a flash bulb. The transition was rapid, and within seconds it melted the glass and vented the neon tube.
Steven
Can you elaborate more on the physics of plasma going into "H" mode?
I have seen this phenomenon myself or at least something similar while playing around with an induction coil and a neon tube, as the neon tube was held close to a high frequency induction coil the tube lights up but at some point the plasma goes from being just normal "neon tube bright" to something more like a flash bulb. The transition was rapid, and within seconds it melted the glass and vented the neon tube.
Steven
http://www.gammaspectacular.com - Gamma Spectrometry Systems
https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG
https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG
-
- Posts: 91
- Joined: Fri Aug 26, 2011 6:19 pm
- Real name:
Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
Steve- Here's a paper that works out the transition point:
http://iopscience.iop.org/article/10.10 ... 21/014/pdf
http://iopscience.iop.org/article/10.10 ... 21/014/pdf
- Steven Sesselmann
- Posts: 2128
- Joined: Wed Aug 10, 2005 9:50 pm
- Real name: Steven Sesselmann
- Location: Sydney - Australia
- Contact:
Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
Jake,
Thanks, read the abstract, but the rest of it is behind a pay wall, so it's inaccessible to me unless I pay $33.
Steven
Thanks, read the abstract, but the rest of it is behind a pay wall, so it's inaccessible to me unless I pay $33.
Steven
http://www.gammaspectacular.com - Gamma Spectrometry Systems
https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG
https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG
-
- Posts: 209
- Joined: Thu Mar 05, 2009 1:49 pm
- Real name:
-
- Posts: 209
- Joined: Thu Mar 05, 2009 1:49 pm
- Real name:
Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
Gave a thin film titanium coated copper target a beating last night. It puked a meganeut or so at 50kV after effectively instantly loading. Wasn't a lot left of it when I pulled it out for a look at the damage. Good stuff!
Also attaching a video, a few photos, and a cool .gif of the focal spot adjusting at lower power. First one's the gif.
https://youtu.be/jLvlHaeXsss
Also attaching a video, a few photos, and a cool .gif of the focal spot adjusting at lower power. First one's the gif.
https://youtu.be/jLvlHaeXsss
-
- Posts: 148
- Joined: Thu May 12, 2011 11:25 pm
- Real name: Bruce Meagher
- Location: San Diego
Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
Robert,
Excellent as always! How thick was your Titanium coating, and are you currently cooling your target?
Bruce
Excellent as always! How thick was your Titanium coating, and are you currently cooling your target?
Bruce
-
- Posts: 810
- Joined: Sun Feb 01, 2004 8:02 pm
- Real name: Andrew Seltzman
- Contact:
Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
You can really see the secondary electrons hitting the viewport, a magnet might work to deflect them.
What's the x-ray dose rate at the viewport?
What's the x-ray dose rate at the viewport?
Andrew Seltzman
www.rtftechnologies.org
www.rtftechnologies.org
- Werner Engel
- Posts: 145
- Joined: Sun Aug 18, 2013 11:51 am
- Real name: Werner Engel
- Location: Vienna, Austria
- Contact:
Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
I just finised work on my new SSPA with 1kW to drive my plasma heating.
Attached you see the numbers (going up to 850W) and a nice picture of the device.
The short video shows the very first test without adjusting the tuner - so you see almost the same power reflected as going out. The sound gives you an idea of the powersupply needed for this!! Unfortunatly the file was not uploaded due to a mp4-restriction.
@Robert: I did not see any RF-discharges in the tuner - as you did. What power levels did you reach when these issues occured?
BR,
Werner
Attached you see the numbers (going up to 850W) and a nice picture of the device.
The short video shows the very first test without adjusting the tuner - so you see almost the same power reflected as going out. The sound gives you an idea of the powersupply needed for this!! Unfortunatly the file was not uploaded due to a mp4-restriction.
@Robert: I did not see any RF-discharges in the tuner - as you did. What power levels did you reach when these issues occured?
BR,
Werner
- Attachments
-
- Amp Test for plasma heating.pdf
- (340.44 KiB) Downloaded 376 times
-
- Posts: 1850
- Joined: Wed Apr 21, 2004 10:29 pm
- Real name: John Futter
- Contact:
Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
Werner
Nice to see you using the W6PQL kits for the SSPA.
You can see my build on https://www.qrz.com/db/ZL2TUD
Nice to see you using the W6PQL kits for the SSPA.
You can see my build on https://www.qrz.com/db/ZL2TUD
- Werner Engel
- Posts: 145
- Joined: Sun Aug 18, 2013 11:51 am
- Real name: Werner Engel
- Location: Vienna, Austria
- Contact:
Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
I just read that you are very good in designing RF devices: I still do not know how to design the antenna for the plasma. My first idea was just trying to use a copper pipe with 14 turns and give it a try - using the tuner. I also thought about calculating a kind of resonance frequency resulting out of the geometry – but did not succeed. Next try was to use a spectrum analyzer with a VSWR bridge to measure the resonance frequency - did not work. What do you think will be the right way to focus on – from your experience?
BR,
Werner
-
- Posts: 1850
- Joined: Wed Apr 21, 2004 10:29 pm
- Real name: John Futter
- Contact:
Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
Werner
we should transfer this to a new post so as to not dilute the good work of Robert Tubbs
I'll start a new post under ion sources to answer this
we should transfer this to a new post so as to not dilute the good work of Robert Tubbs
I'll start a new post under ion sources to answer this
-
- Posts: 364
- Joined: Tue Mar 02, 2004 12:21 pm
- Real name: Roberto Ferrari
- Location: Argentina
- Contact:
Re: Tubbs Beam-on-Target Effort [Neuts/Pics/Tips]
Hi Robert,
Please, comment about the RF power on your Ion Source Inductively Coupled as well as the Proton/Deuteron current.
Could you provide some diagram of your source? I am curious about the three extractors electrodes.
Thanks!
Roberto
Please, comment about the RF power on your Ion Source Inductively Coupled as well as the Proton/Deuteron current.
Could you provide some diagram of your source? I am curious about the three extractors electrodes.
Thanks!
Roberto