Search found 181 matches

by Dan Knapp
Sun Jun 10, 2018 12:41 am
Forum: Images du Jour
Topic: Sharing hamfest booty images
Replies: 22
Views: 2827

Re: Sharing hamfest booty images

I just visited the legendary Silicon Valley Electronics Flea Market in Fry’s parking lot in Sunnyvale. Compared to the season’s first MIT flea market, I would have to rate this one much better (although Andrew reported that the second MIT Flea had a much better turnout than the first one that I atte...
by Dan Knapp
Fri Jun 01, 2018 9:26 pm
Forum: New User Chat Area
Topic: Inner grid size assessment
Replies: 12
Views: 695

Re: Inner grid size assessment

Out of curiosity, I did a web search to see if the book might be available anywhere else. Amazon will rent you a Kindle version for as little as $22 (price depends upon how long you can use it). There are several questionable web sites that claim they have it available for free download, but you use...
by Dan Knapp
Fri Jun 01, 2018 8:57 pm
Forum: New User Chat Area
Topic: Inner grid size assessment
Replies: 12
Views: 695

Re: Inner grid size assessment

Ask your library to borrow a copy for you on interlibrary loan. You can buy a copy of the relevant chapter (Effect of Grid Geometry on IEC Performance) on the Springer web site for $29.95. If you attend a school whose library subscribes to the Springer book series, you can download a pdf copy of the...
by Dan Knapp
Fri Jun 01, 2018 5:55 pm
Forum: The Trading Post
Topic: Sources for Fusor Related Items
Replies: 20
Views: 4573

Re: Sources for Fusor Related Items

Deuterium Source - I just searched multiple sources of deuterium gas and found the best price at Cambridge Isotope laboratories. I bought 50 liters of 99.8% D for $148.00. They charge $95.00 for the non-returnable cylinder and $53.00 for ground UPS shipping. Mine is being shipped to a university add...
by Dan Knapp
Wed May 30, 2018 11:11 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Detector noise problem
Replies: 13
Views: 1633

Re: Detector noise problem

Resistors are 100 ohms. Purpose is to make input and output impedances 50 ohms to match preamp output impedance and cables (amp module has high input impedance).

In rereading my post, I realized I failed to thank all who had made suggestions. Thanks for your input on this.
by Dan Knapp
Wed May 30, 2018 12:58 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Detector noise problem
Replies: 13
Views: 1633

Re: Detector noise problem

I had indicated I would post the solution when this problem was solved. It is now at least partially solved, so here it is. Richard suggested operating the He-3 tube at higher voltage to increase the size of the neutron peaks versus the noise peaks. It turns out there is a published paper on this is...
by Dan Knapp
Tue May 29, 2018 10:09 pm
Forum: New User Chat Area
Topic: Pneumatic gate valve trouble shooting
Replies: 12
Views: 681

Re: Pneumatic gate valve trouble shooting

A cheaper solution is to use a manual valve. I bought one on amazon for $10 (Baomain Manual Hand Lever Control Valve 4H210-08 G1/4" Air Inlet 5 Way 2 Position). The valve has 1/4 NPT fittings. I used 1/8 Swagelok to 1/4 NPT adapters and 1/8 plastic tubing for the air lines. Rather than tie up a comp...
by Dan Knapp
Mon May 28, 2018 2:25 am
Forum: Fusion --- Past, Present, and Future
Topic: Book about Taylor Wilson is out
Replies: 19
Views: 6771

Re: Book about Taylor Wilson is out

Does anyone know what’s become of Taylor? I was very concerned when he got the award that paid him not to go to college. Regardless of how gifted he might be, he should still have gone to college, and to graduate school. There is no way he could make any significant contribution to fusion physics wi...
by Dan Knapp
Mon May 21, 2018 2:20 pm
Forum: New User Chat Area
Topic: Inner grid size assessment
Replies: 12
Views: 695

Re: Inner grid size assessment

There is some discussion of the relative size of cathode grid to anode diameter in the chapter on grids in the book:
Inertial Electrostatic Confinement (IEC) Fusion: Fundamentals and Applications
by George H. Miley and S. Krupakar Murali
by Dan Knapp
Fri May 04, 2018 11:16 am
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: “Magnetically insulated grid IEC”
Replies: 10
Views: 1365

“Magnetically insulated grid IEC”

There is a new post on talk-polywell.org from http://www.hornetechnologies.com about what they call “Magnetically insulated grid IEC.” There is no detail on the device, but it appears to be a “two coil” polywell. They claim continuous operation with HTS coils. Does anyone know anything more about th...