The Forward Neutron Calorimeter needs beam-gas data for calibration purposes. These events should be taken with stable proton beam at 920 GeV and preferably without electron beam. To collect the data, do the following:

• Switch on FNC HV: On A3-Top or B15-Left PC select "Forward Systems HV" window, click on FNC icon, select "LUMI" in "HERA status" drop-down list and then click on "ON" near "Full HV". Wait until FNC HV Status reached "HV full" state (green).
• In SSP "Readout and Data Logging" panel: include in readout only "Central Trigger" and "Subsystem 101" branches, in subsystem 101 enable only FNC subbranch. Disable "Level 3" option.
• In SSP "Trigger" panel: choose "Test and Calibration".
• In SSP: set all Trigger panels (General,Trigger1-4,L2) to "$00000000". Then enable subtriggers s120 and s123.
• Confirm all changes and start the run.
• On CTrig Mac: open "Subtrigger rates and prescales" window and set a prescale for subtrigger s120 so that the s120 rate after prescale (L2 input) is approximately equal to 100 Hz. (divide s120 raw rate by 100 to obtain needed prescale factor).
• Switch to "Permanent Data Logging", confirm all changes and start new run.
• Stop the run after 20 minutes or after 100K events have been collected.
• Write down run number to the H1Logbook.
• Switch FNC HV to Standby: on FNC HV panel select "INJECTION" in "HERA status" drop-down list and then click on "ON" near "Standby HV".
• Restore SSP parameters back to standard.