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and H.Humblot (middle) working on the 3He polariser. The 3He filling station uses laser light to polarise metastable 3He atoms by optical pumping at low pressure (1.3 mbar). The resulting electronic po ... First test of an 3He neutron spin filter The nuclei of a helium-3 gas (3He) can be polarised. Thanks to the strong spin-dependancy of the ...

0.2 2. 3 0 0.2 = fraction of time in background 2. = distance from peak for background measurement (in degrees) 3 = number of iterations 0/1/2/3 for no optimization (0) to full optimization (3) par sps ... sps 30000É: the time is the time per iteration and not the total time par nsf cell_name He_pressure initial_He_pol Date Time T1 cell_name: up to ...

Monochromators PG 002: 2.20 ... 3.60 Å PG 004: 1.10 ... 1.80 Å Cu 220: 0.85 ... 1.50 Å Cu 111: 1.25 ... 2.24 Å take-off angle 2θM 39 ° ... 65° resolution δ> E i / E i 3 ... 6 % flux on sample 5 x 105 cm ... cm -2 s -1 background choppers ν max 5 000 rpm Fermi chopper ν max 32 000 rpm duty cycle 3 x 10 -3 beam size on sample 2 x 4 cm 2 primary ...

intensity of the scattered neutrons is measured by an array of nine microstrip detectors (64-cell, 3He).

in 10 6 n cm -2 s -1 PG (002) 3.355 1.3 - 3.3 2.662 9.3 Cu (111) 2.087 2.0 - 5.3 2.662 3.6 Heusler (111) 3.452 1.3 - 3.2 2.662 2.0 Collimation α1 = (0.015/ki) rad/Å -1 α2, α3, α4 = 10', 20', 30', 40', 60' ... adjustable by soller collimators Analyser horizontally focussing PG(002) 3He detector 50 mm Ø x 12 cm Instrument description IN3 is a classic ...

mode) Detectors nuclear-track position-sensitive UCN detectors spatial resolution ~1 µm low-background 3He UCN counters background ~10 -4 s -1 one- and two-dimensional UCN detectors spatial resolution of ~100 ... A monochromatic neutrons reflected towards guide H172A Ultra Cold Neutron (UCN) source Small size 4 He source 5 liters Environment setup ...

θ < 3.8˚ (horizontal) constant wavelength resolution δλ/λ [0.8-7.0%] elastic Q-range (down) 0.0045 – 0.42 Å -1 (horizontal) elastic Q-range (up) 0.0045 – 0.27 Å -1 (horizontal) Detector type 3He Tubular ... 0045 to 0.42 Å -1 can be achieved for horizontal samples by using just two incoming angles of 0.62 and 3.8˚, and the q-range can be extended ...

shutdown. It is made up of 128 linear sensitive Reuter-Stokes tubes of 8 mm diameter with 15 bars of 3He. Each tube can count neutrons at a rate of 50 kHz with 10% dead time losses. (16-Mar-2004) Find out ... structure analysis using small-angle scattering in solution. Curr Opin Struct Biol 2002 12(5):654-60. 3.Grizot S, Grandvaux N, Fieschi F, ...

respectiveley a 1536 cell (since 2000) curved position sensitive detector (PSD) filled with a mixture of 3He (3.1 bars) and CF4 (0.8 bar). Microstrip plates (invented by Anton Oed) replace the conventional wires ... due to Cadmium shielding and beam-stop inside. cryostat alignment liquid N2 refill liquid He refill liquid He gauge sample change and ...

<210° +56° < χ <205° -180° < φ <180° Detector 120° x 30° position-sensitive detector detector gas: 3He (5 atm) + CF4 (1 atm) Nominal resolution for fixed sample-detector distance of 76 cm 0.19° horiz. x ... sample. The new very large banana PSD is of innovative design and works at high gas pressure (5 atm 3He + 1 atm CF 4 ) for high efficiency ...