The 4G GPTAS is presently a conventional neutron triple-axis spectrometer. The basic specifications are given in the table below.
| Monochromator | Rotating-shield type |
| Reflections | Pyrolytic graphite 002 reflections |
| Size | 120mm(H)X170mm(V) |
| Focusing | Vertical focusing |
| Scattering angle rnage | 18 < 2th_M < 47.4 degrees |
| k_i range | 5.99 < k_i < 2.33 Ang-1 |
| Wavelength range | 1.1 < lambda_i < 2.7 Ang |
| Filter | Inpile PG filter (removable) |
| Sample table | Air floating |
| Goniometer | 1 ton Goniometer |
| Tilt and Translation | Motor controlled |
| Beam size | 40mm(H)X60mm(V) at maximum |
| Scattering angle range | -2 < 2th_S < 119 degrees |
| Analyzer | Air floating |
| Reflections | Pyrolytic graphite 002 and 004 reflections |
| Size | 190mm(H)X100mm(V) |
| Focusing | Vertical focusing |
| Filter | PG filter before analyzer (removable by hand) |
| Collimators | #1 10′, 20′, 40′ |
| #2 10′, 20′, 40′, 80′ | |
| #3 10′, 20′, 40′, 80′ | |
| #4 10′, 20′, 40′, 80′ | |
| Control Software | unified filman |
| Temperature and magnetic field controllable | |
| Sample environment | |
| Low temperature | GM (2.4 K~300 K; default) |
| Orange cryo (1.5 K~300 K) | |
| 1 K cryo (0.7 K~100 K) | |
| 3He cryo (0.3 K~100 K) | |
| Dilution fridge (0.05 K~4 K): liquid He required | |
| High-temperature | High-temperature CTI |
| Magnet | 1 T electric field magnet (2.4 K~ 300 K) |
| 5 T vertical superconducting field magnet (1.5 K~300 K) | |
| 5 T horizontal superconducting field magnet (1.5 K~300 K) |
Please ask instrument scientists for availability if you would like to use the sample enviroment other than GM.