Search found 90 matches

by Rapp Instruments
Tue Jun 14, 2016 6:30 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: tabletop neutron generator
Replies: 15
Views: 16098

Re: tabletop neutron generator

Hi Denis, like wrote the power supplies are simple inverter circuits. 100kV Supply for accelerating http://www.rapp-instruments.de/imageurl/neu/100kv.jpg http://www.rapp-instruments.de/imageurl/neu/image100kv_1.jpg http://www.rapp-instruments.de/imageurl/neu/image100kv_2.jpg 20kV Supply for the Iion...
by Rapp Instruments
Sat Jun 11, 2016 7:42 am
Forum: Ion Gun Design and Construction (& FAQs)
Topic: tabletop neutron generator
Replies: 15
Views: 16098

Re: tabletop neutron generator

Hi, the tube is becoming cleaner because of beeing evacuated for some days and the flashover rate is decreasing substantially . So the accelerating voltage can be hold a 90 kV and I get rather hot samples. The two shortlife isotopes of silver are nicely seen. http://www.rapp-instruments.de/imageurl/...
by Rapp Instruments
Tue Jun 07, 2016 7:20 am
Forum: Ion Gun Design and Construction (& FAQs)
Topic: tabletop neutron generator
Replies: 15
Views: 16098

Re: tabletop neutron generator

Hi Richard, you are quite correct. Mostly because of the fine cannel in the cathode the pressure in the accelerating space is low enough. Otherwise there would be a discharge between cathode and the suppressor. The fine hole in the anode and the long capillary (0.8 mm ID, 50cm long) helps to regulat...
by Rapp Instruments
Mon Jun 06, 2016 8:38 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: tabletop neutron generator
Replies: 15
Views: 16098

Re: tabletop neutron generator

Hi,
a schematic of the source

Image

and a image of the tiny ion beam

Image

Thomas
by Rapp Instruments
Sun Jun 05, 2016 9:19 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: tabletop neutron generator
Replies: 15
Views: 16098

Re: tabletop neutron generator

Hi Werner,
the copper coil you see is not a rf-coil but a capillary tube to feed the deuterium to the canal ray ion source. The ion source is driven by dc current (20kv, about 200..300µA). Construction drawing will following.

Thomas
by Rapp Instruments
Sun Jun 05, 2016 7:10 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: tabletop neutron generator
Replies: 15
Views: 16098

tabletop neutron generator

Hi, I justed finished a small neutron source for detector testing. The function was proved with indium- and silver-activation. The source works with a simple canal-ray ion source and a titan target. The working gas is deuterium from a lecture bottle. The accelerating voltage is arround 100 kV, the t...
by Rapp Instruments
Wed Apr 13, 2016 2:37 pm
Forum: Vacuum Technology (& FAQs)
Topic: one more spectrometer, homemade quadrupol
Replies: 6
Views: 3801

Re: one more spectrometer, homemade quadrupol

Hi Richard,

thanks for the friendly words.

Hi Werner,

on my lathe it took less then one day to turn the parts, one day for assembling and round about two weeks to design and build the electronics.

Thomas
by Rapp Instruments
Sun Feb 14, 2016 11:11 am
Forum: Vacuum Technology (& FAQs)
Topic: one more spectrometer, homemade quadrupol
Replies: 6
Views: 3801

Re: one more spectrometer, homemade quadrupol

Hi Daniel, thanks for looking to my home page. If You have any questions about any project which don't fit to themes of this forum feel free to send a mail (info@rapp-instruments.de) yes, a wien filter would be much easier to build, but it seperates ions by speed. If you want to seperate masses, all...
by Rapp Instruments
Sat Feb 13, 2016 12:37 am
Forum: Vacuum Technology (& FAQs)
Topic: one more spectrometer, homemade quadrupol
Replies: 6
Views: 3801

one more spectrometer, homemade quadrupol

Hello, I justed finished my Quadrupol mass filter. It's a bit more difficult to construct and design the electronics than the sector spectrometer but it's worth to do because of the high sensibilty and the resolution. I think most people here now the principles. Iones are deflected by high frequeny ...
by Rapp Instruments
Mon Jan 25, 2016 8:46 pm
Forum: Vacuum Technology (& FAQs)
Topic: Small and simple mass-spectrometer
Replies: 8
Views: 6744

Re: Small and simple mass-spectrometer

Hi Roberto. I use a simple homemade high voltage amplifier with VMosFet BUZ 80. You can find the circuit http://www.rapp-instruments.de/Elektronik/Messtechnik/hvamp/hvamp.htm . The amplifier can be driven by a DAC LT1257 which is controlled by an Arduino. The output voltage depend on the used powers...