mode - CERN Accelerator School
mode - CERN Accelerator School
mode - CERN Accelerator School
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Long g chains of linac cells<br />
To reduce RF cost, linacs use high-power RF sources feeding a large<br />
number of coupled cells (DTL: 30 30-40 40 cells cells, other high high-frequency frequency<br />
structures can have >100 cells).<br />
Long linac structures operating in the 0 or π <strong>mode</strong>s are extremely<br />
sensitive iti tto mechanical h i l errors: small ll machining hi i errors iin th the cells ll can<br />
induce large differences in the accelerating field between cells.<br />
ω<br />
0 6.67 13.34 20.01 26.68 33.35<br />
0<br />
π/2<br />
π<br />
k<br />
<strong>mode</strong> 0<br />
<strong>mode</strong> π<br />
E<br />
44
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