[Ifeffit] on Tune and Detune

[Enyuan Hu]

Dear all,

I'm new to the community and I was wondering if I can ask some basic
questions here. I heard the beamline scientist mention "tune" and "detune"
and I saw in some materials say "detune to get rid of high order
harmonics", but what is "harmonics"? and why it's necessary to detune to
get rid of high order harmonics? I'd really appreciate it if we can discuss
this a little bit. Thanks.

Enyuan
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