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2 - CERN Accelerator School

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Optics errors:<br />

Optical parameters (Twiss ( Twiss and<br />

dispersion) of the transfer line<br />

at the injection point are<br />

different from those of the ring<br />

Consequences:<br />

The beam performs quadrupolar<br />

oscillations (size changes on a<br />

turn-by turn by-turn turn basis). The<br />

emittance grows due to the<br />

filamentation<br />

Solution:<br />

Tune transfer line to match<br />

optics of the ring<br />

Injection process - VI<br />

Massimo Giovannozzi CAS - 2-14 14 October 2005 19<br />

x’<br />

Ring ellipse<br />

Transfer<br />

line ellipse<br />

x

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