STEP: kills the radiometer effect by very low pressure (thanks to very low temperature) and by keeping temperature gradients across the test cylinders small)

Note: Thermal noise depends on T/m (m=mass of test body), which is about the same in STEP and GG (GG has lower temperature but more massive test bodies)

EP tests in LEO: the most subtle disturbance (II)

mSCOPE (design similar to STEP, but room temperature): unless it is thermally isolated better than LISA, the radiometer effect is 20 times larger than its target signal !!

GG: kills the radiometer effect at room temperature because the test cylinders spin (2 Hz) around their symmetry axis [natural choice] thus averaging out temperature gradients

Nobili et al. PRD, 63, 101101, 2001;   submitted 2001