| Emittance |
|
|
| As a
particle returns to the same point on subsequent revolutions, |
|
| it will map out
an ellipse in phase space, defined by |
|
| Area = e |
| Twiss Parameters |
|
|
| An
ensemble of particles will have a “bounding” e. This is referred to as the |
|
| “emmitance” of
the ensemble. Various definitions: |
|
| Electron
machines: |
| Contains 39% of
Gaussian particles |
| Usually leave p as a unit, e.g. E=12 p-mm-mrad |
| Proton machines: |
| Contains 95% of
Gaussian particles |
| (FNAL) |