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| Apple II helical undulator | HU56 |
| Magnetic material | NdFeB |
| Maximum vertical magnetic field (T) | 0.70 |
| Maximum horizontal magnetic field (T) | 0.43 |
| Length (m) | 4.732 |
| Period (mm) | 56 |
| Number of periods | 84.5 |
| Minimum gap (mm) | 20 |
| Energy range (eV) | 200–3000 (LH) |
| 440–3000 (LV) | |
| 330–1500 (C) |
