  We benchmark and analyze the error of energy conservation (EC) scheme for
Particle in cell/Monte-Carlo Couple (PIC/MCC) algorithms by a radio frequency
discharging simulation. The plasma heating behaviors and electron distributing
functions obtained by 1D simulation are analyzed. Both explicit and implicit
algorithms are checked. The results showed that the EC scheme can eliminated
the self-heating with wide grid spacing in both cases with a small reduction of
the accuracies. In typical parameters, the EC implicit scheme has higher
precision than EC explicit scheme.
  Some "numerical cooling" behaviors are observed and analyzed. Some other
error are analyzed also. The analysis showed
  EC implicit scheme can be used to qualitative estimation of some discharge
problems with much less computational resource costs without much loss of
accuracies.
