Search found 1342 matches

by John Futter
Tue Jan 22, 2019 4:01 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Construction of Neutron Grade Fusor
Replies: 21
Views: 548

Re: Construction of Neutron Grade Fusor

Enzo the clue is in your x-ray graph of voltage vs dose it is your view port ie silicon and or some aluminium somewhere ie ceramic insulator for your high voltage all very good leak sites at about 20-30kV, Stainless holds back until 50kV or more do not assume that the x-rays follow striaght lines th...
by John Futter
Fri Jan 18, 2019 6:35 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Integrated Lab Measuring and Controlling (Labview, Labjack, ...)
Replies: 36
Views: 1129

Re: Integrated Lab Measuring and Controlling (Labview, Labjack, ...)

I personally would never use labview for any real time application for a start it sits atop a non real time operating system. Getting reliable data in real time keeps many experts very busy one very good example is http://www.coultersmithing.com/forums/viewtopic.php?f=13&t=640 One place real time da...
by John Futter
Thu Jan 17, 2019 5:53 am
Forum: The Trading Post
Topic: Looking for: Controller Panel for Spellman-Bertan PMT power supply
Replies: 20
Views: 594

Re: Looking for: Controller Panel for Spellman-Bertan PMT power supply

Ive bought these connectors off RS components not cheap but they are there in 5 days from order and what use are these supplies bias supply for detectors, ion focusing ie einzel lens, secondary electron suppression and a stopper of car antenna benders --did this many years ago every friday night all...
by John Futter
Tue Jan 15, 2019 6:13 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: How to figure out the specs of old Rigaku scintillation tube probe?
Replies: 22
Views: 1158

Re: How to figure out the specs of old Rigaku scintillation tube probe?

Harald We use beam profile monitors at work to know the shape and position of our ion beams look them up they are a bent peice of wire that rotates within the ion beam tube and present a differing position target to the beam without taking out much beam energy so you can leave them in while running ...
by John Futter
Tue Jan 08, 2019 6:05 pm
Forum: New User Chat Area
Topic: Roots Pump
Replies: 2
Views: 168

Re: Roots Pump

Chris
Normally a roots type pump is used with an ordinary backing pump to significantly speed up the pumping speed
they are also used in industrial cutting lasers to circulate the lasing gas through an intercooler
by John Futter
Tue Jan 08, 2019 6:02 am
Forum: Please Introduce Yourself
Topic: New SoCal Effort
Replies: 7
Views: 373

Re: New SoCal Effort

No I was not allowed to ie no good reason to produce ionising radiation Although If I wanted to do it over a weekend with another staff member on hand to satisfy safety concerns I probably could. 'Recently I have been running high power carbon beams (Butane gas) in the ion source and ion currents of...
by John Futter
Mon Jan 07, 2019 6:20 pm
Forum: Please Introduce Yourself
Topic: New SoCal Effort
Replies: 7
Views: 373

Re: New SoCal Effort

Joe What makes you think that Garret only used a mechanical pump yes the operating point is above the lowest pressure that a mechanical pump can achieve but the pumping speed is almost zero. you need vacuums before you start of 10^-5 torr or better to remove as much crud especially water vapor from ...
by John Futter
Sat Jan 05, 2019 2:16 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Liquid dialectrics
Replies: 2
Views: 190

Re: Liquid dialectrics

You really need to do a search first before asking this question here
It would have been ok in the new user chat area
by John Futter
Sat Jan 05, 2019 2:10 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: HV Divider
Replies: 8
Views: 769

Re: HV Divider

I would buy a box of VR68 5M1 series resistors from Vishay available from digikey etc
$0.28 each a box = 500 so about US$150 ish a box share with another member
each resistor is designed to cope with 10kV but this may be less due to actual dissipation limit of 1 watt --you work it out
by John Futter
Thu Jan 03, 2019 6:20 pm
Forum: Vacuum Technology (& FAQs)
Topic: Cleaning/Repairing Edwards E2M5
Replies: 13
Views: 736

Re: Cleaning/Repairing Edwards E2M5

The oil sight glass is o-ring sealed to the box
be careful it is easy to break it when attempting to remove.
Our Mch workshop @ work made a new one out of perspex when we broke one