Determine the central wavelength of the order ECH_WAVECEN
Use a binary chop search to determine the order which corresponds to the given echelle gamma angle. Having determined the order, perform a similar search to determine the wavelength within the order which corresponds to the given echelle theta angle.
ECH_INIT
must be called before calling this routine.
CALL
ECH_WAVECEN
(THETA
, GAMMA
, WC
, MC
, STATUS
)
READ | THETA | REAL | Echelle theta angle corresponding to the current configuration (radians) |
READ | GAMMA | REAL | Echelle gamma angle corresponding to the current configuration (radians) |
WRITE | WC | REAL | Central wavelength corresponding to the current configuration (ie that wavelength which lies within order M and is closest to that in the centre of the field) |
WRITE | MC | INTEGER | Order number corresponding to the current configuration (the order closest to that in the centre of the field) |
READ , WRITE | STATUS | INTEGER | Global status value |
C.J. Hirst UCL
(ZUVAD
::CJH
)