McStas logo McStas - A neutron ray-trace simulation package ILL; PSI; ESS Niels Bohr Institute DTU Physics NEXMAP

McStas

About McStas
 Conditions of use
 Authors/Contacts
 Project funding

Download
 Components
 Other Downloads (share)

Mailing list

Search web/mailinglist

Documentation
 Wiki (GitHub)
 McStas manual
 Publications

Links

Report bugs (GitHub)

Code-repository (GitHub)


McStas: ISIS_SANS2d_Mantid

[ Identification | Description | Input parameters | Links ]

The ISIS_SANS2d_Mantid Instrument

This instrument models the ISIS TS2 SANS2d instrument.

Identification

  • Site: ISIS
  • Author: Richard Heenan with edits by Peter Willendrup
  • Origin: ISIS, DTU Fysik
  • Date: 2014

Description

This instrument models the ISIS TS2 SANS2d instrument up to the sample position.

From the author:

IMPORTANT: The instrument model does not currently include a correct moderator description - and the results it produces have not been validated against experimental results.

The actual bender is continuously curved, here use straight segments approx.with gravity. 1/7/10 L1=4m increased gap between bender exit and S1 slit from .247 to .286m At 4m we actually use 1.75 to 16.5 angstrom.

Note "2m guides" are actually 1.985m long (new ones will be 1.981m) so "real gaps" are included below, losses are pro-rata the gap/guide lengths.

Both rear & front detectors are 980mm square and offset 150 above beam (would only use 100mm with hindsight)

Rear detector can be offset -300mm or +269mm sideways.

Front detector is closest at approx 1.4m, furthest at approx((read det position) - 1.6m) , offset up to -1200mm sideways there are 2 baffles between front & rear detector

NIMROD (W5) spectrum might better than SANS2d (E2) spectrum for liquid H2 face incurent use. Stu Ansell's McStas spectra for TS-2 actually have no angle variation included. In reality spectra and backgrounds will vary, fast background is likely much higher on ZOOM(E1) than SANS2d (E2)

RKH 2014

Input parameters

Parameters in boldface are required; the others are optional.
NameUnitDescriptionDefault
L1mVariable distance from 1st to 2nd variable slit3.926
A1wmWidth of first collimation slit, rectangular slit0.030
A1hmHeight of first collimation slit, rectangular slit0.02
S6mRadius of slit S6 (last of the optis slits)0.006
A2mRadius of second collimation slit, circular slit0.006
LminAAMinimum wavelength to produce at the source1
LmaxAAMaximum wavelength to produce at the source14
model_nrSANS_benchmark2 SANS sample nr. E.g. 5: sphere(r=50AA), 15: sphere(r=150AA)15.0

Links


[ Identification | Description | Input parameters | Links ]

Generated on 2024-01-03 11:47:43


Last Modified: Wednesday, 03-Jan-2024 19:59:11 CET
Search website mailinglist archive GitHub repos