AMMRL: helium refill using a vacuum pump to pressurize the helium

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Hi,

a few minutes ago I read this question concerning helium refill using
a bladder.
I want to share our experience using a vacuum pump to refill helium.

First of all of course you need a reservoir of gaseous helium. This
might be a balloon, which contains a little bit of your evaporated
helium. Much better, of course, is a recovery line for the gaseous
helium.

The remaining part is easy. Attach the vacuum side of your pump
(we use a SV16, which is often used for pumped magnets) to that
reservoir and the other side of the pump to your helium can.
Of course you have to run  the pump a while to clean all tubes with
gaseous helium.

That's it. You can manipulate the filling pressure by simply switching
the pump on and off.

The pump itself is not really cheap. We used a machine from a
pump station of a 750 MHz magnet, which was not longer really
reliable. But for the short (and supervised) filling procedures this
pump is absolutely o.K.

Greetings

Rainer

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