Multi-ply rectangular bellows 1096/494 for the fusion reactor Wendelstein 7-X. Material 1.4429 (maximal permability 1.01 μ, limited cobalt content). Including a permanent leakage control device during operation.
Pressure: Ultra High Vacuum (UHV)
Movements: axial +/- 37 mm, lateral +/- 24 mm
Tests: Tested in vacuum chamber with helium overpressure for leak rate <10-8 mbar, spring rate test and cycle test under vacuum
