LCTPC parameters for ILD optimization

After discussing with the lctpc friends, here are the proposals, marked by '=>':

1) As a function of drift-distance L_{drift}, the expression for the r\phi point resolution is, as you know,

sigma_{point}^2 = sigma_0^2 + Cd^2/N_{eff} * L_{drift}

 Proposal 1) on point resolution:
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=>  sigma_0^2 = (50micron)^2 + (900micron*sin(phi))^2

(where phi is the local azimuthal angle of track wrt the padrow)

 
=>Cd^2/N_{eff}}=25^2/(22/sin(theta)*h/6mm)=(5.3micron/sqrt(cm))^2*(6mm/h)*sin(theta)

(this is for B=4T which we favor, h is the pad height=pad-row pitch in mm, theta is the polar angle)

 
=>sigma_z = 400micron

2) Endplate thickness:

Proposal 2) on Endplate thickness:
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=>X_{tpcendplate}/X_0 = 0.15