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Polarised cold neutron beam facility PF1B

PF1B is the facility dedicated to the particle and nuclear physics experiments with polarized and un-polarized cold neutrons. The neutron beam position is at the neutron guide H113.

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Instrument Description

Guide hall n1 (ILL7), cold neutron guide H113

 Vertical liquid deuterium cold source

super-mirror (m=2) ballistic neutron guide H113, 76 m length

Un-polarized beam cross-section

6 cm by 20 cm

Height of the neutron beam above the floor level

PF1B: 140 cm

Mean neutron wavelength

4.0-4.5 A

Un-polarized equivalent flux

1.8*1010 n/cm2/s

Polarized beam cross-section

3 cm by 4.5 cm or 6 cm by 8 cm

Polarized equivalent flux

3*109 n/cm2/s

Polarizers

Curved stack of glass plates with double sided super-mirror coating, polarization 98%

Crossed geometry of two super-mirror polarizers, polarization 99.7%

Spin-flippers

"Current-sheet" and adiabatic radio-frequency flippers; efficiency >99.5%