2 - CERN Accelerator School
2 - CERN Accelerator School
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