code: public AceExperiment getExperiment(String exname) {
          if (this.eidMap.containsKey(exname)) {
              return this.experimentMap.get(eidMap.get(exname));
          } else {
              return null;
          }
      }
docs: Return a Experiment by given experiment name.
  
  @param exname the experiment name
  
  @return {@link AceExperiment}