Determine the optimal prism rotation and position ECH_PRISMPOS
Determine the prism rotation and position by direct calculation. The rotation is such that a ray of the specified wavelength will fall on the centre of the detector. The position is such that the echelle is fully illuminated by rays of the specified wavelength.
ECH_INIT
must be called before calling this routine.
CALL
ECH_PRISMPOS
(WC
, GAMMA
, POS
, STATUS
)
READ | WC | REAL | Desired central wavelength (Angstroms) |
WRITE | GAMMA | REAL | Optimal prism rotation (radians) |
WRITE | POS | REAL | Optimal prism position (mm) |
READ , WRITE | STATUS | INTEGER | Global status value |
C.J. Hirst UCL
(ZUVAD
::CJH
)