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For solar Doppler measures....depending on the wavelength you want to use, I'd stop down the aperture to around 100mm and include suitable narrow filter - Ha or OIII type..
This should reduce the heat loading on the scope and on the spectroscope slit plate.
A similar but different problem exists when designing a spectroheliograph.. generally these use achromatic refractors with a focal length to suit the slit height...
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