Search found 111 matches

by Joe Gayo
Sun Jul 28, 2019 4:35 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 23331

Re: Joe Gayo's lab tour

After a high power run, interesting peaks at 5 and 6 amu
Peaks5-11.png
by Joe Gayo
Sun Jul 28, 2019 12:16 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 23331

Re: Joe Gayo's lab tour

The x-axis is AMU ... these are all single scans that take about 1 minute
by Joe Gayo
Sat Jul 27, 2019 11:45 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 23331

Re: Joe Gayo's lab tour

Initial Pump Down versus Base Pressure After Multiple Heating Cycles
Pressure (Torr).png
Before and After Run
Pressure (Torr) (1).png
by Joe Gayo
Sat Jul 27, 2019 2:39 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 23331

Re: Joe Gayo's lab tour

Getting Serious ... added a turbo and RGA
IMG_2249.jpg
IMG_2250.jpg
by Joe Gayo
Mon Jul 22, 2019 4:16 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 23331

Re: Joe Gayo's lab tour

I'll post more details in the near future, but I was having issues of gamma/x-ray pile-up above 90kV. These normally low amplitudes pulses pilled up to such an extreme level that they crossed the discriminator threshold. This was resolved in the typical fashion with increased distance, shielding, an...
by Joe Gayo
Mon Jul 22, 2019 3:23 pm
Forum: Images du Jour
Topic: Neutron Club Application - Mark Rowley
Replies: 6
Views: 2397

Re: Neutron Club Application - Mark Rowley

@Mark - Just for completeness, you are running the SNM-14 tube (http://www.sovtube.com/x-ray-and-geiger-tubes/601-snm-14.html) below the corona region which does remove the corona noise but may present a gamma rejection problem at higher voltages. This seems to recommend 900-1000V - https://inis.iae...
by Joe Gayo
Tue Jul 02, 2019 1:23 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 23331

Re: Joe Gayo's lab tour

Yes, but I want a lot more data. I’ve had some runs where the rates were much higher but unfortunately I didn’t have a bubble dosimeter present.

I’ve activated silver, indium, and manganese quite easily to many times background. The device can run at 5E+6 for extended periods (60 minutes).
by Joe Gayo
Tue Jul 02, 2019 1:07 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 23331

Re: Joe Gayo's lab tour

I have a bubble dosimeter reading of 4.8E+7 which seems ridiculous...

@Robert
I have Knoll’s book and agree it’s a must. There are several things I’m going to investigate with the counting electronics (plus add the greater distance detector)
by Joe Gayo
Tue Jul 02, 2019 12:22 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 23331

Re: Joe Gayo's lab tour

Yes, I’m going to set up an additional detector at a greater distance (The present detector location is calibrated and gives nice resolution for low current/voltage operating conditions), but I was curious about typical resolving time for a BF3 detector system. I could setup a signal generator to te...
by Joe Gayo
Mon Jul 01, 2019 7:23 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 23331

Re: Joe Gayo's lab tour

@Lukas - If you are talking about the small oscillations that follow a trendline, then this is a result of the statistical nature of neutron measurement. The counts are averaged over 500 msec but I only report rates that have been averaged over 5 seconds or more and not a single measurement spike. @...