[Sneap] RF Puzzle

[Gerhard Randers-Pehrson]

Hello all

 

Our RF ion source is acting strangely:

 

When probe voltage is applied, we get no probe current, and there is no
change in beam current which is very small.

 

With the machine open, the voltage is present on the probe cap and the
current meter indication is consistent with the meter resistance.

 

It is as though there is a resistive layer inside the cap.

 

The bottle had been in use only 6 days before this happened and worked ok
until then.

 

Any clues or cures?

 

Gerhard

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