Category Archives: HPF Hardware

The HPF cryostat test drive: sub-milliKelvin temperature stability

Background: the need to cool HPF down to 180K One of the most frequently discussed topics on this blog has been the need to enclose the HPF instrument in a stable, cold environment.  Because HPF will observe stars in infrared … Continue reading

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What to do when your star wanders

As we’ve mentioned in prior blog posts, high precision Doppler radial velocity (RV) measurements require extraordinarily stable instruments to measure the spectral shifts in the stellar absorption features induced by orbiting planets. How small are these shifts? A 10 cm/s velocity signal, … Continue reading

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We Have a Cryostat

If you have been following the blog up to now, you have seen our discussion of the technical requirements and specifications for our cryostat — the giant, temperature-controlled vacuum chamber that will house the HPF instrument.  The cryostat has been in … Continue reading

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