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Registered Member #2038
Joined: Fri Mar 20 2009, 03:39PM
Location: Bristol Uk
Posts: 60
A couple of weekends ago i helped to represent my astronomy club Bristol Astronomical Society) at the Bristol Festival of Nature, as part of our display stand we were loaned a scintilating type Muon detector, which was a little black box with a round photomultiplier tube, every time a muon crossed the scintilating fibres you saw a streak of light dash across the screen.
originally we had a small webcam over the screen and displayed the image on a laptop, which was good because the laptop screen was getting quite a lot of attention, but the strikes were very hard to see due to the poor frame rate and sensitivity of the webcam.
Since then i have been thinking about finding a more "exciting" (pun intended) type of Muon detector that will wow the crowds even more than the original scintilating detector.
many of these detectors use a matrix of high voltage plates... to excite the muon particle (i think, i'm no particle pysicist!) and create a spark as it passes through.
i thought it might be a good idea to ask here if anyone has had any experience in building such a device? If the idea seems plausible i will hopefully have a few other members of the astronomical society with the skills needed to pull this off. i can easily handle the assembly of such a device, but the technical side is beyond me.
Registered Member #311
Joined: Sun Mar 12 2006, 08:28PM
Location:
Posts: 253
google spark chambers e.g.here They used to have one at the London Science museum, in the nuclear energy section - last saw it a good few years ago, but you could see some pretty clear tracks as particles went through it. Unfortunately it isn't there any more.
Registered Member #2038
Joined: Fri Mar 20 2009, 03:39PM
Location: Bristol Uk
Posts: 60
Thanks mike, i have done a reasonably extensive google search but didnt come up with that one. it breaks it down nice and simple to explain the basic function.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
I have made simple coincidence devices using three GM tubes and a lead plate to shield off all but cosmic rays.
You can also stack up fluorescent light tubes, and charge them by winding a widely spaced coil round the outside of each, connected to EHT.
When all of them flash at once, you can actually see the angle of a muon strike - though it must be in a darkened room, and you must be patient!
I haven't tried it with scintillator plastic and a PMT - ( because the plastic is very expensive by my standards) but obviously this is the best method, the plastic sheet having a much bigger area than even large GM tubes.
I know about multi-electrode detectors, but the engineering looks too hard by my small standards.
Here is useful paper on the three GM tube Rossi technique:
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Cosmic Ray (Muon) detector
