1. Baffle arrangement for LCGT
Previous consideration
　Baffles are placed at calculated reflection points.
But!
　Reflection points are separated in the asymmetrical configuration for LCGT.
R. Takahashi, June 30, 2006

2. Effective baffle number
Arm length L
Radius of pipe R
Height of baffle h
Pitch of baffle d

3. Parameters Revised points Arm length 3000m Pipe diameter 1000mm
Mirror diameter 250mm
Radius of curvature 4500m
Height of baffle 50mm
Pitch of baffle 11m
Distance of mirror 600mm
Offset of mirror 340mm
Seismic 10-11m/Hz1/2
Effective baffle number 27
Revised points
2 arms ➞ x1.4
w0 23mm ➞ 33mm
1x10-23 ➞ 2x10-23 [/Hz1/2] (6x10-20[m/Hz1/2])

4. Estimated noise
cf. Sensitivity of LCGT
6x10-20 m/Hz1/2
Pipe diameter
1.0m
1.2m
Number of baffle 27 22
Direct coupling
[10-21m/Hz1/2]
0.2 -
Pipe scattering
4.9
1.0
3.1
0.6
Safety margin 12 60 19
100
(COST: \70M ➞ \238M)