dry_run = False
do_elog = True

if get_exec_pars().source == CommandSource.ui:
    bph_ref_user = 0.0
    plt          = None
else:
    bph_ref_user = args[0]
    plt          = args[1]
phaseOffset_old = caget('SINEG01-RSYS:SET-VSUM-PHASE-OFFSET-BASE')
phaseOffset_new = phaseOffset_old - bph_ref_user
if not dry_run:
    caput('SINEG01-RSYS:SET-VSUM-PHASE-OFFSET-BASE', phaseOffset_new)
    caput('SINEG01-RSYS:CMD-LOAD-CALIB-BEAM', 1)
if do_elog:
        log_msg =           "SINEG01-RSYS:SET-VSUM-PHASE-OFFSET-BASE \n"
        log_msg = log_msg + "Old:     %0.1f" % phaseOffset_old + "deg \n"
        log_msg = log_msg + "New:     %0.1f" % phaseOffset_new + "deg \n"
        log_msg = log_msg + "Charge on-set at %0.1f" % -phaseOffset_new + "deg RF phase (0.0 deg beam phase)\n"
        attachments = []
        if plt is not None:
            sleep(0.1) #Give some time to plot to be finished - it is not sync  with acquisition
            file_name = os.path.abspath(get_context().setup.getContextPath() + "/SchottkyScanSetPlot.png")
            plt.saveSnapshot(file_name , "png")
            attachments = [file_name]
        elog("Set gun phase", log_msg, attachments)
show_message("Success setting phase reference")