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Examples p of DTL<br />

Top; <strong>CERN</strong> Linac2 Drift Tube Linac accelerating tank 1 (200<br />

MHz). The tank is 7m long (diameter 1m) and provides an<br />

energy gain of 10 MeV.<br />

Left: DTL prototype for <strong>CERN</strong> Linac4 (352 MHz). Focusing is<br />

provided by (small) quadrupoles inside drift tubes. Length<br />

of drift tubes (cell length) increases with proton velocity.<br />

19

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