Date: Fri, 18 Feb 2005 09:15:17 -0700

Author: "David Kardelis"

Subject: RE: electroscope

Post:

I vaguely remember a tube like this just coming out for High Energy
Physics particle detectors as I was finishing my PHD in 94. I never
really got to play with it but they were thinking of using it to upgrade
some of the detectors. dave

David Kardelis Ph.D.
Chairman; Dept of Chemistry and Physics
College of Eastern Utah
451 E 400 N
Price, UT 84501

david.kardelis@ceu.edu
435-613-5258
435-613-5125 (lab phone)
435-613-5996 Fax

> -----Original Message-----
> From: owner-tap-l@listproc.appstate.edu [mailto:owner-tap-
> l@listproc.appstate.edu] On Behalf Of Wolfgang Rueckner
> Sent: Friday, February 18, 2005 7:51 AM
> To: tap-l@listproc.appstate.edu
> Subject: Re: electroscope
>
> What you're describing sounds like a Geiger tube of sorts? -- Wolfgang
>
>
> On Feb 18, 2005, at 8:58 AM, sampere wrote:
>
> > They experimenting with some kind of straw tube detector. They
> > pressurize these tubes with some gas, not sure what yet, but they
hold
> > a high pressure without bursting. There's a fine wire running the
> > length of them. If this project gets funding, they expect to 12,000
> > feet (where are the MKS units?) of this stuff. So there will be
plenty
> > to have.
> >
> > I'll post a pic later.
> >
> > Sam
> >
> > Wolfgang Rueckner wrote:
> >
> >> Sounds like a neat electroscope, Sam. What are these "straws"
> >> actually used for in HEP? -- Wolfgang
> >>
> >>
> >> On Feb 17, 2005, at 4:40 PM, sampere wrote:
> >>
> >>> I just made a pretty neat electroscope that's visible and works
> >>> incredible well. I stumbled across this straw material in the shop
> >>> last week on one of the benches. I ask a few questions and find
out
> >>> it's conductive, so I take a piece. I cut some aluminum sheet with
> >>> some shears and punch a few holes and fabricate essentially a
Braun
> >>> electroscope in all of about 5 minutes. The straw is shiny and
about
> >>> 1/4" OD, so it's pretty visible all by itself, but glue a couple
> >>> mylar flags at each end and the thing is very visible! The straws
> >>> are 7 micron thick kapton walls coated on the inside and outside
> >>> with a copper film and weighs next to nothing. A stainless steel
pin
> >>> is the pivot. The lengh of this straw is about 15", so even small
> >>> angular deflections are easily seen.
> >>>
> >>> I used it today for the parallel plate capacitor demo - worked
> >>> great. No more gold leaf electroscopes!
> >>>
> >>> Depending on what happens to federal spending on HEP dictates
> >>> whether we'll have tons of this stuff around or not. If we
> >>> eventually get tons, I'll share, in the meantime, go snooping
around
> >>> your HEP labs.
> >>>
> >>> Sam
> >>>
> >

From Gerald_Zani@brown.edu Fri Feb 18 11:18:37 2005

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