Re: [TCML] Magnetic Quenching

[Bert Hickman <bert.hickman@xxxxxxxxxx>]

Hi Tony,

Magnetic quenching works by stretching the spark gap plasma over a 
longer curved path. During primary current ringup/ringdown, the arc 
spreads out over a wider, plane-like region. Spreading out the arc aids 
in cooling, potentially aiding in quenching at the expense of a somewhat 
higher gap voltage drop. During a current notch, quenching has no direct 
effect, but more rapid cooling would assist in the gap recovering its 
dielectric strength during primary notches.

The longer the duration of the current notch, the more time the gap has 
to recover. The degree of arc stretching is proportional to gap current 
and the applied magnetic field. Magnetic quenching should be most 
effective systems operating at lower frequency, using higher peak 
primary currents, with powerful NIB magnets providing the ambient field. 
Tesla claimed success using relatively poor magnets of his day. So have 
a number of modern day experimenters on the TCML using ferrite and NIB 
magnets.

However, there are few quantified, before-after tests, and the area is 
ripe for further research. The technique should be effective for both 
static and rotary gaps.

Bert

Sfxneon@xxxxxxx wrote:
> Hi all,
>  
> Just how effective is magnetic quenching, and has anyone experimented with  
> using it, either by itself or in conjunction with other methods of  quenching?
>  
> Tony Greer
>
>
>
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