  We report on the impact of the extended geometry of a ring-dimple trap on
particle loss heating of a degenerate Fermi gas. When the Fermi level is
slightly greater than the depth of the dimple and a non-degenerate "halo" is
present, the overall heating rate is reduced relative to the case of a bare
ring. We find that the experimentally measured heating rates for the overfilled
dimple are in good agreement with a model of the hole-induced heating caused by
background gas collisions. This suppression of the heating rate can be helpful
for experimental studies of fermionic superfluids in the weak pairing limit,
where achieving and maintaining low temperatures over long time scales is
essential.
