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== Preliminary (base) desisn of folded stable cavities == The task is to determine the locations and the ROCs of the folding mirrors given the following constraints. === Boundary Conditions === The boundary conditions for the design of the folded RCs are the following. {{attachment:BoundaryCondition1.png| |width=700}} * The TEM00 mode in the RCs should match the arm cavity modes. * Out of 73m of the RC length, 25m should be allocated between the BS and the ITMs for radiation shield. * The Gouy phase shift in the RC (one-way) must be about 20deg. * The beam spot sizes on the optics should not be too small (what is the tolerance ?). * There is a minimum distance between, e.g., the PRM and PR2 coming from the size of the SAS. == Preliminary (base) design of unfolded stable cavities == [[attachment:100429.pdf]] == Current design of marginally stable cavities == |
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== Old (current) layout of vacuum tanks == * Layout * Limitations |
Describe LCGT/subgroup/ifo/ISC/TaskList/SpatialMode/SpatialModeDesign here.
Preliminary (base) desisn of folded stable cavities
The task is to determine the locations and the ROCs of the folding mirrors given the following constraints.
Boundary Conditions
The boundary conditions for the design of the folded RCs are the following. 
- The TEM00 mode in the RCs should match the arm cavity modes.
- Out of 73m of the RC length, 25m should be allocated between the BS and the ITMs for radiation shield.
- The Gouy phase shift in the RC (one-way) must be about 20deg.
- The beam spot sizes on the optics should not be too small (what is the tolerance ?).
- There is a minimum distance between, e.g., the PRM and PR2 coming from the size of the SAS.
Preliminary (base) design of unfolded stable cavities
Current design of marginally stable cavities
Some limitations in the view of vacuum and seismic attenuation group
- maximum beam shift
- minimum tank separation
Old (current) layout of vacuum tanks
- Layout
- Limitations