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CAMEA

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Instrument Description

CAMEA is a multiplexing instrument, which benefits from the nearly perfect transmission of highly oriented pyrolytic graphite in a cold neutron beam. A series of eight upward scattering analyser arcs diffract the neutrons onto a detector array that consists of 104 position sensitive 3He tubes.

CAMEA description 1

CAMEA uses the prismatic analyser concept that allows recording a range of energies for each analyser segment.  The analysis software provides different binning options, helping to accommodate the needs of the user, i.e. maximising intensity or energy resolution.

Camea description 2

The background at CAMEA is kept at its minimum (0.2 counts/minute and detector) via an active shielding. The CAMEA unit sits in a vacuum tank (~10-7 mbar) that has a very low magnetic permeability (< 10-7 H/m). The tank is further dressed with Boralcan and 20 cm thick borated polyethylene blocks. The crosstalk between the different analyser is minimised through a 3 mm thick honeycomb structure made of Boralcan-dressed aluminium. Higher-order lambda contributions are suppressed by a Beryllium filter at the entrance of the spectrometer unit. The filter is combined with a radial collimator.

CAMEA description 3

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