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Characteristics

Guide hall nº1, cold neutron guide H112
beam size at sample 30 x 30 mm2(smaller for BATS t.b.d.)
Sample environment
cryofurnace (50 mm); max. sample diameter 48 mm 1.8 K - 560 K
cryostat (70 mm); max. sample diameter 68 mm 1.5 K - 320K
furnace 300 - 1300 K
vacbox 70mm - highly variable housing with outer dimension of orange cryostat with narrow tail; various vacuum tight connectors and feed through adaptable for your needs (to be prepared in time with an instrument responsible) no temperature control foreseen yet, but possible near RT
no windows to secondary spectrometer which is typically in vacuum (ONLY if no risk of sample leakage! breaking & re-pumping of vacuum 1-2 hours) or otionally in air.

Characteristics

IN16B is on H112

  • efficient optics with ballistic neutron guide
  • two main configurations:
    • 'high flux' (HF) at guide end position or
    • 'low background' (LB) at guide side position
  • band width selection with selector and additional PG(002) deflector in LB configuration
  • flux gain through Phase Space Transformation (PST) chopper
  • more solid angle by new taller analysers
  • wider dynamic range through new Doppler linear motor drive and PST
  • lower background through background chopper and vacuum housing
  • secondary spectrometer can be operated alternatively without vacuum
  • several Doppler velocity profiles (sine, constant velocity)

change over times for configurations:

Change-over times between different configurations are long and if possible will be scheduled for a full or half cycles only. As an example the change from HF to LB configuration or back including alignment needs several days and the change between different monochromator/analyser configurations including alignment needs about 2 days.

detectors
standard: PSD multidetector array (16 tubes with vertical position sensitivity) + 23He counters + 1 monitoralternatively: up to 83He single counters and no PSDFor diffraction: PSD's (in progress)
Instrument configurations
Si(111) Si(311) GaAs(200) BATS
standard E-resolution high E-resolution access to high Q with high E-resolution best E-resolution wide E-transfer range
monochromator Si111 Si111 polished Si311 GaAs200(first prototype commissioning 2017; to be continued end 2018) TOF-backscatteringchopper cascade & selector(commissioning ongoing)
incident wavelength (Å) 6.271 6.271 3.275 5.654 dlambda/lambda ~12%
incident energy (meV) 2.08 2.08 7.63 2.56
flux at the sample (n/cm2/s)@ 58 MW HF: 6.0 105LB: 8.7 104 t.b.d. HF: 1.2e5 t.b.d., but sensibly lower than Si(111) t.b.d.
analysers Si(111):  small angle & arc analysers of old IN16 type; 6 new tallLargeAngleAnalysers (LAAs) Si(111) polished:  small angle & arc analysers + only 3 old IN16 type LAAs (half height ±19°) Si(311): NO small angle & NO arc analysers; only 6 old IN16 type LAAs (half height ±19°) GaAs(200)~ 0.3 m2test analyser Si(111) or Si(311)
energy resolution (μeV) ∼0.75 ∼0.30 (~0.5 SANS) ∼ 2.0 reached ~ 75 neV in first commissioning March 2017 ~ 1.5 - 8
energy transfer (μeV) ±31 ±31 ±59 t.b.d., ~ ± 250 / ±70 / -850...1000forSi(111) / Si(111) high rep. rate / Si(311)
Q-range (Å-1) 0.1 - 1.8 0.1 - 1.8 0.7 - 3.5 t.b.d. ~ 0.2 - 1.8
comments high flux (HF) standard positionNEW: choose chopper ratio 1:1 for 'high flux' or 2:1 for 'high signal-to-noise' (HSNR-mode)low background position (LB)  commissionedavailable only if well justified (consider HSNR instead) commissionedin HF positionmonochromator now available commissionedin HF positionbe aware of Bragg contaminations from sample holder and cryostatsbe aware of low fluxforesee delay in scheduling as accepted experiments need to be grouped into one cycle German Verbundforschungs-project of FAU-Erlangen & ILL - financed by the German ministry BMBF(July 2013 - July 2019)commissioning of a reduced surface analyser and monochromator done in cycle 171prototyping - not yet aimed for user operation German Verbundforschungs-project of FAU-Erlangen & ILL - financed by the German ministry BMBF(July 2013 - July 2019)in user operation