mode - CERN Accelerator School
mode - CERN Accelerator School
mode - CERN Accelerator School
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Disc-loaded structures<br />
operating in 0-<strong>mode</strong><br />
The Drift Tube Linac<br />
(Alvarez)<br />
Add tubes for high<br />
shunt impedance<br />
2 advantages of the 0-<strong>mode</strong>:<br />
1. the fields are such that if we eliminate the walls<br />
between cells the fields are not affected, but we<br />
have less RF currents and higher shunt<br />
impedance.<br />
2. The “drift tubes” can be long (~0.75 βλ), the<br />
particles are inside the tubes when the electric<br />
fi field ld is i decelerating, d l ti and d we have h space to t<br />
introduce focusing elements (quadrupoles)<br />
inside the tubes.<br />
Maximize coupling<br />
between cells →<br />
remove completely<br />
the walls<br />
17
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