[ Identification | Description | Input parameters | Links ]

# The `ILL_H142_IN12` Instrument

The H142 S-curved cold guide at the ILL feeding IN12 TAS spectrometer

## Identification

- Site: ILL
- Author: FARHI Emmanuel (farhi@ill.fr)
- Origin: ILL
- Date: April 7, 2004

## Description

    The H142 beam is the only S-curved guide at the ILL. It is used here to feed
    the IN12 TAS spectrometer (classical configuration).

## Input parameters

Parameters in boldface are required; the others are optional.

Name | Unit | Description | Default
m | 1 | m-value of guide coating (H14/H142) | 1
KI | Angs-1 | central wavevector for incoming neutrons | 2.662
QM | Angs-1 | wavevector transfer modulus at the sample | 1.0
EN | meV | energy transfer at the sample | 0.0
verbose |  | verbose-mode toggle | 1
WM | m | Width of monochromator | 0.08
HM | m | Height of monochromator | 0.12
NHM | 1 | Number of vertical slabs composing the monochromator | 1
NVM | 1 | Number of horizontal slabs composing the monochromator | 6
RMV | m | Monochromator vertical curvature, 0 for flat, -1 for automatic setting | -1
WA | m | Width of analyzer | 0.121
HA | m | Height of analyzer | 0.118
NHA | 1 | Number of horizontal slabs composing the analyzer | 11
NVA | 1 | Number of vertical slabs composing the analyzer | 1
RAH | m | Analyzer horizontal curvature, 0 for flat, -1 for automatic setting | -1
L2 | m | Monochromator-Sample distance. Contains 2nd Collimator | 1.726
L3 | m | Sample-Analyzer distance. Contains 3rd Collimator | 1.300
L4 | m | Analyzer-detector distance. Contains 4th Collimator | 0.710

## Links

- Source code for `ILL_H142_IN12.instr`.
- The IN12 TAS at the ILL

[ Identification | Description | Input parameters | Links ]