| XX CODE | [ Sector or Subsystem System Description ] |
| -- | Hall A Dump Line |
| 0F | IRFEL Injector (Injector Test Stand) |
| 0G | IRFEL Injector Dump |
| 0L | Injector |
| 0V | FEL Drive Laser |
| 1F | IRFEL Linac |
| 1G | IRFEL Extraction Dump & Chicane |
| 1L | North Linac (3L, 5L, 7L, 9L may be used to indicate higher passes |
| 1P | Compton Polarimeter line in Hall A stub tunnel |
| 1V | IR FEL Optical Cavity,Transport,Control Rm & Labs |
| 2F | FEL 1st Reverse Bend |
| 2G | FEL Straight Ahead Dump |
| 2L | South Linac YY: cryomodule #:02, 03, 04, 05, etc. |
| 2V | UV FEL Optical Cavity, Transport,Control Rm & Labs |
| 3F | FEL Backleg |
| 3V | FEL Tera Hz Experiment |
| 4F | FEL Optical Cavity (Wiggler) |
| 4V | FEL X-Ray Experiment |
| 54 | FEL-TL CHL Bayonet Can |
| 55 | FEL-TL Expansion Can |
| 56 | FEL-TL East End |
| 5F | FEL 2nd Reverse Bend |
| 5V | FEL Helios Experiment |
| 6V | FEL Experiment -TBD- |
| 71 | Hall A Spectrometer, Electron Arm |
| 72 | Hall A Spectrometer, Hadron Arm |
| 74 | Hall A Target |
| 75 | Hall A Transfer Line |
| 7D | Energy Recovery Line - So Linac |
| 7V | FEL Experiment - TBD- |
| 82 | Hall B Polarized Target |
| 8V | FEL Experiment -TBD- |
| 9D | Hall C Dump Line |
| 9V | FEL Experiment - TBD- |
| EA | East Arc |
| ER | Energy Recovery Qtr & Half Chicane |
| OC | FEL Optical Cavity |
| OT | FEL Optical Transport (includes Drive Laser) |
| PD | Polarized dump line |
| RB | Recirculation in the pre-accelerator |
| TD | Hall B Tagger Dump Line |
| WA | West Arc |
| -- | Hall A Dump Line |
| 0 | Compressor - System Control |
| 1 | Compressor - #1 |
| 2 | Compressor - #2 |
| 3 | Compressor - #3 |
| 4 | Compressor - #4 |
| 5 | Compressor _ #5 |
| 6 | Compressor - #6 |
| 8 | Compressor - Purifier System |
| 9 | Compressor - Guard Vacuum System |
| 11 | Refrigerator - High Pressure Stream |
| 12 | Refrigerator - Medium Pressure Stream |
| 13 | Refrigerator - Low Pressure Stream |
| 14 | Refrigerator - Cold Compressor Stream |
| 15 | Nitrogen System |
| 16 | LHe Dewar, TL, and Pump |
| 17 | Oil System |
| 18 | Nitrogen System |
| 19 | Vacuum System |
| 20 | CTF System Control |
| 21 | CTF Compressor - #1 |
| 22 | CTF Compressor - #2 |
| 23 | CTF Compressor - #3 |
| 24 | CTF Cold Box - #1 & He Distribution |
| 25 | CTF Cold Box - #2 |
| 26 | CTF Cold Box - #3 |
| 27 | CTF R & D |
| 28 | CTF Purifier System & N2 System |
| 29 | CTF Vacuum System |
| 40 | NW End of TL |
| 41 | Tee Area of North Linac TL |
| 42 | NE End of TL |
| 43 | North Linac CHL Expansion Boxes |
| 44 | Supply and Return Headers |
| 50 | SW End of TL |
| 51 | Tee area of South Linac TL |
| 52 | SE End of TL |
| 53 | South Linac CHL Expansion Boxes |
| 60 | ESR System Control and Gas Return |
| 61 | ESR Compressor #1 |
| 62 | ESR Compressor #2 |
| 63 | ESR Compressor #3 |
| 64 | ESR Compressor #4 |
| 65 | End Station TL |
| 66 | ESR Refrigerator |
| 67 | ESR Valve Box |
| 68 | ESR Purifier |
| 69 | ESR Vacuum System |
| 70 | Hall A Gas Return |
| 80 | Hall B Gas Return |
| 81 | Hall B CLAS |
| 85 | Hall B TL |
| 90 | Hall C Gas Return |
| 91 | Hall C Spectrometer #1 |
| 92 | Hall C Spectrometer #2 |
| 93 | Hall C Spectrometer #3 |
| 95 | Hall C TL |
| D3 | Hall C Dump |
| 1H | Hall A |
| 2H | Hall B |
| 3H | Hall C |
| T3 | Hall C Target |
| D1 | Hall A Dump |
| D2 | Hall B Dump |
| SD | Fast shutdown system |
| 0I | Unpolarized injector |
| 0R | Recombiner between pre-accelerator and the north linac |
| 1A | First Arc - lowest energy line |
| 1C | Transport Channel to end station A |
| 1D | Spectrometer beam line in the 500 KeV section |
| 1E | First Extractor - lowest energy line |
| 1I | Polarized injector |
| 1R | First Recombiner - lowest energy line |
| 1S | First Spreader - lowest energy line |
| 2A | Second Arc - lowest energy line |
| 2C | Transport Channel to end station B |
| 2D | Spectrometer beam line in the 5 MeV section |
| 2E | Second Extractor - lowest energy line |
| 2R | Recombiner between second arc and north linac |
| 2S | Second Spreader - lowest energy line |
| 2T | Transport Channel Two |
| 3A | Third Arc - next energy line |
| 3C | Transport Channel to end station C |
| 3D | 5 MeV Mott Polarimeter dump line |
| 3E | Third Extractor - next energy line |
| 3M | Moller polarimeter, Line 3C |
| 3R | Third Recombiner - next energy line |
| 3S | Third Spreader - next energy line |
| 4A | Fourth Arc - next energy line |
| 4C | Dump beam line in BSY stub |
| 4D | Spectrometer beam line in the 45 MeV section |
| 4E | Fourth Extractor - next energy line |
| 4R | Recombiner between fourth arc and north linac |
| 4S | Fourth Spreader - next energy line |
| 4T | Transport Channel Four |
| 5A | Fifth Arc - next energy line |
| 5D | Spectrometer beam line at position 1L26 (removed) |
| 5E | Fifth Extractor - next energy line |
| 5R | Fifth Recombiner - next energy line |
| 5S | Fifth Spreader - next energy line |
| 6A | Sixth Arc - next energy line |
| 6D | Dump beam line at 142 degree in east arc (removed) |
| 6E | Sixth Extractor - next energy line |
| 6R | Recombiner between sixth arc and north linac |
| 6S | Sixth Spreader - next energy line |
| 6T | Transport Channel Six |
| 7A | Seventh Arc - next energy line |
| 7E | Seventh Extractor - next energy line |
| 7R | Seventh Recombiner - next energy line |
| 7S | Seventh Spreader - next energy line |
| 8A | Eighth Arc - next energy line |
| 8D | Dump beam line at end of injection chicane at 0R07 (temporary) |
| 8E | Eighth Extractor - next energy line |
| 8R | Recombiner between eighth arc and north linac |
| 8S | Eighth Spreader - next energy line |
| 8T | Transport Channel Eight |
| 9A | Ninth Arc - highest energy line |
| 9E | Ninth Extractor - highest energy line |
| 9R | Ninth Recombiner - highest energy line |
| 9S | Ninth Spreader - highest energy line |
| AS | Transport Channel Dipole bridge to Transport Channel Ten |
| AT | Transport Channel Ten |
| EO | Spectrometer beam line in the 500 Ke V section |
| NS | Dump beam line in north stub |
| RC | Recirculation chicane in the pre-accelerator |