Characteristics

Guide hall nº1, cold neutron guide H112
beam size at sample30 x 30 mm2
sample environment
cryofurnace (50 mm); max. sample diameter 48 mm1.8 K - 560 K  
cryostat (70 mm); max. sample diameter 68 mm1.5 K - 320K
furnace300 - 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 optionally in vacuum (breaking & re-pumping of vacuum 1-2 hours) or air . ONLY if no risk of sample leakage !

detectors

standard: PSD multidetector array (16 tubes with vertical position sensitivity) + 2 3He counters + 1 monitor

 alternatively: up to 8 3He single counters and no PSD

For diffraction: PSD's (in progress)

Instrument configurations


Si(111)Si(311)GaAs(200)BATS
standard E-resolutionhigh E-resolution access to high Q with high E-resolutionbest E-resolution        wide E-transfer range  
monochromatorSi111 Si111 polishedSi311

GaAs200

(first feasibility tests 2017)

TOF-backscattering

chopper cascade & selector

(autumn 2017)

incident wavelength (Å)6.2716.2713.2755.654dlambda/lambda ~12%
incident energy (meV)2.082.087.632.56

flux at the sample (n/cm2/s)

@ 58 MW

HF: 6.0 105 

LB: 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 tall Large Angle Analysers (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 m2 test analyser

Si(111) or Si(311)

energy resoution (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±59t.b.d., 

~ ± 250 / ±70 / -850...1000

for

Si(111) / Si(111) high rep. rate / Si(311)

Q-range (Å-1)0.1 - 1.80.1 - 1.80.7 - 3.5t.b.d.~ 0.2 - 1.8
comments

high flux (HF) standard position

NEW: choose chopper ratio 1:1 for 'high flux' or 2:1 for 'high signal-to-noise' (HSNR-mode)

low background position (LB)  commissioned

available only if well justified (consider HSNR instead)


commissioned

in HF position

 

 

 

 

 

 

 

 

 

monochromator now available

commissioned

in HF position

 

 

- be aware of Bragg contaminations from sample holder and cryostats

- be aware of low flux

- foresee 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 2016)

commissioning of a reduced surface analyser and monochromator done in cycle 171

prototyping - not yet aimed for user operation

German Verbundforschungs-project of FAU-Erlangen & ILL - financed by the German ministry BMBF

(July 2013 - July 2019)

commissioning planned for autumn 2017

not yet open in call for proposals 

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.