Joe Frisch: Synchrotron radiation sources and free ... - Conferences
Joe Frisch: Synchrotron radiation sources and free ... - Conferences
Joe Frisch: Synchrotron radiation sources and free ... - Conferences
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Gain, Saturation <strong>and</strong> Taper<br />
LCLS Gain at max energy (10 KeV)<br />
Exponential<br />
gain regime<br />
Saturation<br />
LCLS undulator has pole “cant”<br />
that allows small field adjustments<br />
Taper increases saturation power 2X<br />
Gain saturates because so much energy is<br />
extracted from the electron beam that it<br />
falls out of phase with the X-rays <strong>and</strong> no<br />
longer generates power<br />
Can “taper” undulator fields: Lower K<br />
results in lower resonant E-beam energy.<br />
Adjust gap along the length of the<br />
undulator.<br />
5-mrad pole<br />
cant angle<br />
31
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