An Introduction to the Ion-Optics of Magnet Spectrometers
An Introduction to the Ion-Optics of Magnet Spectrometers
An Introduction to the Ion-Optics of Magnet Spectrometers
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Emittance ε measurement<br />
by tuning a quadrupole<br />
Lee, p. 55<br />
The emittance ε can also be<br />
determined with a quadrupole<br />
and a viewer at distance L.<br />
x max =<br />
σ 11 (1 + σ 12 L/ σ 11 − L g) + (εL) 2 /σ 22<br />
(13)<br />
g =<br />
dBz/dx ∗ l<br />
Bρ<br />
(Quadr. field strength<br />
l = eff. field length)<br />
(14)<br />
L = Distance between quadrupole and<br />
beam pr<strong>of</strong>ile moni<strong>to</strong>r<br />
Take minimum 3 measurements <strong>of</strong><br />
x max (g) and determine Emittance ε
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