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Drift velocity and diffusion depend on mean time between collisions and inelastic cross sections (see Blum and Rolandi and Biagi’s Magbolz Code)

P10 drift velocity vs E field

at 1 atmosphere

Just a sketch

5.6

cm/ms

130 volt/cm

STAR operating

point

velocity

Drift velocity and diffusion depend on mean time between collisions and inelastic cross sections (see Blum and Rolandi and Biagi’s Magbolz Code)