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Multipactor in Low Pressure Gas and in ... - of Richard Udiljak

Multipactor in Low Pressure Gas and in ... - of Richard Udiljak

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Voltage [V]<br />

10 3<br />

10 0<br />

µ=0<br />

µ=0.75<br />

µ=0.75<br />

Vacuum multipactor<br />

Frequency − Gap product [GHz⋅mm]<br />

Figure 3.12: <strong>Multipactor</strong> thresholds <strong>in</strong> low pressure argon for the two lowest<br />

order modes (N = 1 <strong>and</strong> N = 3) with µ = 0.75 <strong>and</strong> µ = 0<br />

respectively. In this case, the second cross-over energy is about<br />

7 times greater than <strong>in</strong> Fig. 3.11. Parameters used are: W1 =<br />

170 eV , W0 = 4 eV, σse,max(0) = 1.3, ɛ0 = 0, pd = 25 Pa·mm<br />

for N = 1, <strong>and</strong> pd = 15 Pa·mm for N = 3.<br />

56<br />

µ=0

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