RE: Good to be back PM Tubes (fwd)

[Steven Roys <sroys@xxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 28 Oct 2003 20:40:56 -0800
From: Dave Halliday <dh@xxxxxxxxxxxxxx>
To: 'High Voltage list' <hvlist@xxxxxxxxxx>
Subject: RE: Good to be back  PM Tubes (fwd)

Including the option to recieve a free PMT handbook:
http://usa.hamamatsu.com/forms/pmthandbook.htm

The schematic is pretty simple - use a voltage multiplier to get the
1,000KVDC - stability is critical because the gain of the tube depends
on this.  Also, do __not__ overvoltage - you will fry the tube (internal
arcing and too much current)

Also, do __not__ apply voltage in roomlight (otherwise, the tube will
try to pass waaay the #@$& too much current) - work with the tube
completely dark.  Nice tube holders can be made from PVC or copper
plumbing fittings - also outside weatherproof electrical ELL boxes are
great.  Metal has the advantage of electrostatically shielding the unit.
Build a mechanical shutter - a simple piece of sheet metal between two
pieces of flat opaque plastic is fine.

The voltage division chain is a string of identical resistors (5% is
perfect).  The final output can go right into the current sensing node
of an inverting opamp setup.

Fun stuff!
Dave



> -----Original Message-----
> From: High Voltage list [mailto:hvlist@xxxxxxxxxx]
> Sent: Tuesday, October 28, 2003 1:33 PM
> To: hvlist@xxxxxxxxxx
> Subject: Re: Good to be back PM Tubes (fwd)
>
>
> Original poster: Steven Roys <sroys@xxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Tue, 28 Oct 2003 12:15:15 -0700
> From: Gomez <gomez@xxxxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: Good to be back  PM Tubes (fwd)
>
> On Sunday, October 26, 2003, at 09:45  PM, High Voltage list wrote:
>
> > Original poster: Steven Roys <sroys@xxxxxxxx>
> > ---------- Forwarded message ----------
> > Date: Sun, 26 Oct 2003 14:30:02 -0000
> > From: Gordon Mark Forrest <gmforrest@xxxxxxxxxxxxx>
> > To: hvlist@xxxxxxxxxx
> > Subject: Good to be back  PM Tubes
> >
> > Great to be back.
> >
> >   How would I build a power supply to run a PM Tube at 1kV? It's a
> > Hamamatsu R456A. Average anode current 0.1mA. It measures
> from 160nm
> > to 870nm. Want to use it to measure light flashes from a
> > NaI(Th) crystal emitting at 415nm.
>
>   Looks like there is lots of technical information on the
> Hamamatsu web site, including free applications and technical manuals.
>
>
>
>