CHIPIR ChipIR diaphragm
2012 | ISIS
This device was developed for the fast neutron beam collimator of the Chipir instrument, which is one of four instruments part of the Phase 2 extension to Target Station 2 of the ISIS facility at The Rutherford Appleton Laboratory. The device is located in a highly radioactive environment.
The project consists of large vertical horizontal and rotation precision movement design and development for the ISIS neutron source. A 9 Tonne cylinder rotation, two 500kg horizontal and two 500kg vertical movements, measured precision below 0.01 mm. A 5 Tonne 1000mm movement, measured precision below 0.01 mm.
The collimator consists of two independent assemblies, a ‘Beam Selector’ and a ‘Jaws Set’.
The ‘Beam Selector’ (Approximate weight 9000Kg) consists of a rotary composite block which a selection of apertures of varying size and geometry. The block also accommodates space for shutting the beam off. Here are some remarkable characteristics:
1600mm diameter x 680mm composite block, viz:
50mmAluminium - 5083100mm Pb (Lead) (%Sb<4%)
250mm Fe (Steel) - BS970 230M07 (EN1A)
30mm Ni - 200/201 99.6%
200mm Fe (Steel) - BS970 230M07 (EN1A)
50mm Aluminium - 5083
The Jaws Set is capable of reducing the overall beam profile from 250mm square to 0mm at the closed position. Control, movement and positioning of each jaw’s block are independent and variable so as to accommodate various beam sections and centre positions. The Jaws Set is capable of being moved out of the Beamline to allow the Beam Selector to be used independently.
4 x 600 x 500 x 250 steel blocks, BS970 230M07 (EN1A)
Inside face of each block has replaceable/interchangeable scrapers inset as follows:
1 x 250x100x27 - Aluminium - 5083
3 x 250x100x27 – Tungsten (95% min)
1 x 250x100x27 – Steel - BS970 230M07 (EN1A)
Client: ISIS Neutron and Muon Source