[ Identification | Description | Input parameters | Links ]

# The `ILL_H143_LADI` Instrument

The LADI protein crystallography cold Laue diffractometer

## Identification

- Site: ILL
- Author: Emmanuel Farhi
- Origin: ILL (France)
- Date: Sept 2014.

## Description

    LADI-III is a quasi-Laue neutron diffractometer used for single-crystal studies
    of biological macromolecules at high resolution (1.5 - 2.5Å) in order to locate
    individual protons or deuterons of special interest, water structures or other
    small molecules that can be marked with deuterium to be particularly visible.
    Data collection is feasible for samples with unit-cell edges ranging from 50
    to 150Å using crystal volumes from ~0.05 to 0.5mm3, respectively.

    LADI-III uses a large cylindrical area detector composed of neutron-sensitive
    image-plates, which completely surround the crystal and allows large numbers
    of reflections to be recorded simultaneously. Data are collected using a
    quasi-Laue method in order to provide a rapid survey of reciprocal space, while
    reducing the background on the detector compared to use of the full white beam.

    LADI:
    Guide H143:
    H14_1     H14_2     H14_3 [OT1] H143_1 [OT2]  H143_2    last
    Length  [m]   6.8       6         21          30            35        1
    m             2         2         2           1,bot=1.4     1,bot=1.4 idem
    Rh      [km]  -         2.7       4.0         -             -         -
    Rv      [km]  -         -         -           2.0           2.0       2.0
    n_elm.        2         5         11          15            14        last=1m
    section [mm]  45x220    45x220    45x220-200  45x30+95      30x30+95  [w*h+v.offset]

    Filter:      Ni/Ti multilayer band-pass filter, Quasi-Laue (dlambda/lambda<30%)
    Collimation: Pinholes 0.5 to 2.9 mm
    Detector:    image plate 1250 x 450 mm2
    Sample:      at 2.710 mm from the end of the guide H143.

## Input parameters

Parameters in boldface are required; the others are optional.

Name | Unit | Description | Default
lambda | Angs | wavelength | 3.2
dlambda | Angs | wavelength HALF spread. | 1
reflections | str | list of reflections describing the sample SX | "leucine.lau"

## Links

- Source code for `ILL_H143_LADI.instr`.

[ Identification | Description | Input parameters | Links ]