Dennis, Wrong person. I still have plans to do pulse shape descriminatiin with some of my bc-412 stockpile. Unfortunately, I have many plans, each one moving forward at a glacially slow pace.
Search found 72 matches
- Wed Nov 15, 2017 7:33 pm
- Forum: Ion Gun Design and Construction (& FAQs)
- Topic: Deuterium Accelerator and Electro-Static Power Supply
- Replies: 18
- Views: 958
Dennis, Nice to see that you’re continuing your electrostatic accelerator efforts. As Finn mentioned you want to get as much charge on the belt as possible. Belt material (with high surface resistivity), width, speed and comb design will determine how much current your VdG will get to the terminal. ...
- Wed Nov 15, 2017 4:36 pm
- Forum: Neutrons, Radiation, and Detection (& FAQs)
- Topic: Neutron Scintillation Tube/Counter
- Replies: 33
- Views: 971
If you want to detect fast neutrons properly with these plastic scintillators you need to implement pulse “shape" discrimination. The shape of the light output from a gamma event compared to a neutron event (longer tail) is sufficiently different that it is relatively straight forward to design a ci...
- Wed Oct 18, 2017 9:04 pm
- Forum: Announcements and Site Administration Topics
- Topic: Paging Garrett Young
- Replies: 5
- Views: 332
I bought one of his supplies back in June, but never received it. I’ve been unable to reach him for months. I’m hoping the power supply didn’t get the better of him.
Edit. Removed email address.
Edit. Removed email address.
- Thu Sep 21, 2017 7:32 pm
- Forum: Images du Jour
- Topic: Fusor progress, Finn Hammer
- Replies: 21
- Views: 1075
From your picture above it appears there is some pitting in your weld on the inside of your chamber. I’d imagine this will limit the ultimate pressure you can achieve, but I do not have any practical experience to say what that limit might be. Fusors do not require much of a vacuum in the scheme of ...
Have you checked transducer status @254T?;FF on you Quattro 999 to verify your hot cathode filament is ok (when the pressure is below 5mTorr)? As Andrew mentions make sure you have at least a 90 degree bend so the gauge doesn’t have line of sight to the pump. An instructive exercise would be to put ...
- Wed Sep 06, 2017 5:25 am
- Forum: Vacuum Technology (& FAQs)
- Topic: MKS Quattro
- Replies: 15
- Views: 776
Roberto, Some things you might double check before completely disassembling... Verify you didn’t mix up the +/- signals. Check your RS485 adaptor is setup as 8 data bits, no parity, and one stop bit (in half duplex mode bridge T+ to R+ and T- to R-). Check all 6 different baud rates (9600 is the def...
- Wed Aug 30, 2017 8:44 pm
- Forum: High Voltage - Fusor Input Power (& FAQs)
- Topic: Bonding Tungsten and/or Iridium?
- Replies: 25
- Views: 1408
Ian, As Jerry and others have mentioned, ideally you want a transformer whose secondary has one or two turns to make proper spot welds. You’re after gobs of current for a very short interval (with pressure). Check out the attached two documents for a great primer on the subject. Of course you can we...
Have you tried removing the vanes (labeled 29 on the parts list) and retightened the bolts to see if they are the cause? Since the pump was working previously maybe you just reinstalled the vanes incorrectly.