i faceing the problum in hot side displacer

1:what is the volume ratio or compression ratio between hot and cold side.

2:what is the best gap between displacer and cylinder wall i do some research on it i find it 0.1-0.3mm.

3: what is the best matrial for displacer and displacer cylinder.

4: and where to connect exit for hot air on the displacer is it top of displacer or bottom of displacer.

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