V20

ESS Test Beamline

List of publications
Instrument Data
Beam tube NL-2b
Guide coating M3 supermirror
Guide crosssection 60 x 125 mm2
Guide length 46.2 m
Guide curvature Cold source - 5m ; straight
5m - 10m ; R=1500m
10m - 42m ; R=2300m
42m - 46m ; straight
Flux ~1·109 n/cm2/s
Software caress
Space for test setups ~12 m
Neutron optical benches
  • modular design based on aluminium elements
  • four benches can cover a distance of 10-12m
  • benches flexible in position and height
  • one bench for heavy loads beyond 1000 kg
  • polyethylene/B4C tunnels to screen radiation
Sample environment standard HZB sample environment, tensile loading system
Chopper cascade
  • Two double disc counter rotating choppers Ø=700mm
    -Source chopper (mimicks the ESS pulse structure)
    -WLB chopper

  • Four single disc choppers Ø=600mm
    -WFM pulse shaping chopper 1
    -WFM pulse shaping chopper 2
    -FOL chopper 1
    -FOL chopper 2
Operation modes
  • Basic TOF pulsed mode
    Source chopper & WLB chopper

  • TOF WFM mode
    whole chopper cascade
Wavelength 0.7 < λ < 15 Å
Wavelength bandwidth
  • 6.1 Å - 10.2 Å
    (Basic TOF pulsed mode)

  • 7.3 Å
    (TOF WFM mode)
Wavelength frames
  • frame one  2 - 3.5 Å
  • frame two  3.5 - 4.8 Å
  • frame three  4.8 - 6.1 Å
  • frame four  6.1 - 7.2 Å
  • frame five  7.2 - 8.3 Å
  • frame six  8.3 - 9.3 Å
(WFM mode only. Frames can be shifted as well.)
Wavelength resolution
  • 14.5 %, 7.2 % and 3.6 % Δλ/λ at 59 m
    for 2 Å, 4 Å, and 8 Å respectively
    (Basic TOF pulsed mode)

  • 0.5 % - 2 %  tunable constant Δλ/λ at 54 m
    wavelength independent resolution
    (TOF WFM mode)
Polarized neutrons S-Bender