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{{attachment:ResonantCurves.png}} {{attachment:ResonantCurves.png|width=800}}

Only the upper sidebands are plotted here. It is clear that the two sidebands
get different phase shifts when reflected by the arm cavities.
It is desirable to have them both at exactly an anti-resonance. However, it is not possible unless we change
the arm length a lot.

Arm Cavity Design

RF Sideband resonance in the arm cavities

We have to avoid RF sidebands to be resonant in the arm cavities. For example, canonical parameters (L=3000.0, f1=11.25MHz) give the following resonant curves.

width=800

Only the upper sidebands are plotted here. It is clear that the two sidebands get different phase shifts when reflected by the arm cavities. It is desirable to have them both at exactly an anti-resonance. However, it is not possible unless we change the arm length a lot.

LCGT/subgroup/ifo/ISC/ArmCavityDesign (last edited 2010-12-08 17:53:20 by YoichiAso)