% White Pupil Echelle Spectrograph geometry sequence parameters: % Spectrograph definitions: B 100.0[mm] Collimated beam diameter d_mag 2.0 White pupil demagnification constant (i.e, f_1/f_2) f_1 800[mm] Primary mirror (OAP 1) focal length f_2 f_1/d_mag Secondary mirror (OAP 2) focal length f_clear 0.95 Mirror clear aperture fraction d0_OAP_1 185.0[mm] Full diameter of OAP 1 dc_OAP_1 f_clear*d0_OAP_1 Clear diameter of OAP 1 Tc_OAP_1 d0_OAP_1/6 Center thickness OAP 1 d0_OAP_2 125.0[mm] Full diameter of OAP 2 dc_OAP_2 f_clear*d0_OAP_2 Clear diameter of OAP 2 Tc_OAP_2 d0_OAP_2/6 Center thickness OAP 2 theta_i 7.50[deg] OAP off axis angle dx_1 f_1*tan(theta_i) Entrance pupil off axis distance dx_2 f_2*tan(theta_i) Exit pupil off axis distance dx_1_nom dx_1-f_1*tan(2*gamma_ech) Primary mirror off axis distance dx_2_nom dx_2+f_1*tan(2*gamma_ech) Secondary mirror off axis distance % Echelle grating definitions: R_num 4.0 Echelle grating R# theta_B atan(R_num) Echelle grating blaze angle gamma_ech -0.65[deg] Echelle grating out of plane angle W_ech 1.05*B Echelle grating width D_ech R_num*W_ech Echelle grating depth H_ech D_ech/10 Echelle grating height % Cross-dispersion definitions: lam_xdp 525.0[nm] Cross-disp. grating mid-wavelength T_xdp 725.0[mm^-1] Cross-disp. grating line frequency sigma_xdp 1/T_xdp Cross-disp. grating line spacing theta_xdp asin(lam_xdp/(2*sigma_xdp)) Cross-disp. grating blaze angle W_xdp 1.50*B/d_mag Cross-disp. grating width D_xdp 1.25*B/d_mag Cross-disp. grating depth H_xdp W_xdp/10 Cross-disp. grating height Z_xdp -75.0[mm] Cross-disp. grating displacement