Comments by "Dr Gamma D" (@DrDeuteron) on "Sabine Hossenfelder"
channel.
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@TheLivirus the synchrotron I saw was from 28 GeV positrons going around Hamburg. But on second thought… it may have been a black and white camera. Since the visible spectrum is so far below the critical frequency for any reasonable source …power would go like the cube root of frequency….which is pretty mild, so white is reasonable. Cherenkov has number of photons proportion to frequency, power as the square of frequency, and it is most certainly blue (and UV)…. But I have on,y done Cherenkov and bremstrahlung professionally…and the latter was in the few GeV range, far from visible.
Regarding the color..idk my atomic and molecular lines, but it comes from solar wind ionizing or exciting atmospheric gases, and then in recombination or deexcitation, characteristic lines are emitted (scintillation) but note: it depends strongly on pressure and temp, because the mean collision time can be much less than the excited atom/molecule lifetime, and collisions quench the emission. Oh, and I worked in gas scintillation, since it is background noise for gas Cherenkov detectors. So I worked in everything but synchrotron.
Except for the fact that DESY used synchrotron emission to polarize the positron beam via the Sokolov Ternov effect.
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