How to optimize the built geogemtry at my favored temerature in CASTEP, not dynamics?

Hi everyone:

Recently I want to do some geogemtry optimization at the real experiment temperatures, But Idon't how to set the temperature, does it correlate with smearing width? Could I change the simulation temperature by setting the different smearing widths for the reason that they can be descriped by the formula 'smearing width=kT'?

Any help will be appreciated. Thanks in advance.

Sincerly
 Li