mode - CERN Accelerator School
mode - CERN Accelerator School
mode - CERN Accelerator School
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Quarter Wave Resonators<br />
Simple 2-gap cavities commonly used in their<br />
superconducting version (lead, niobium, sputtered niobium)<br />
ffor llow bbeta protons or iion li linacs, where h ~CW CW operation i iis<br />
required.<br />
Synchronicity (distance βλ/2 between the 2 gaps) is<br />
guaranteed only for one energy/velocity, while for easiness<br />
of f construction t ti a li linac iis composed d bby series i of f id identical ti l<br />
QWR’s → reduction of energy gain for “off-energy”<br />
cavities, Transit Time Factor curves as below:<br />
“phase slippage”<br />
27