[ Identification | Description | Examples | Input parameters | Links ]

The `SOLEIL_CRISTAL` Instrument

SOLEIL CRISTAL beamline: diffraction with 2/4/6-circle diffractometers.

Identification

Site: SOLEIL
Author: FARHI Emmanuel with help of Claude (Anthropic), adapted from SOLEIL_MARS and SOLEIL_DIFFABS
Origin: SOLEIL
Date: September 2026

Description

CRISTAL is a diffraction beam-line covering 5-30 keV (CRISTAL_dE/E ~1e-4), fed by an
in-vacuum U20 undulator (98 periods, 20 mm period). The optical layout, in
beam order, is: primary slit, Si(111) double-crystal monochromator (DCM,
second crystal sagittally bent for horizontal focusing - not modelled here
for simplicity), a pair of horizontally-deflecting Si mirrors (Rh/Pt coated,
first one bendable, for horizontal focusing and harmonic rejection), a
secondary slit, and finally the sample stage. Most powder-diffraction work
is done on the 2-circle diffractometer, equipped with a curved Mythen-II
pixel detector (radius 720 mm). Only components that act on the beam are
modelled; hutch diagnostics such as xbpm, beam imagers and attenuators are
omitted for simplicity.

Examples

(Test cases in bold)

Test: CRISTAL_E0=12 Detector: CRISTAL_detector_diffraction_I=700000.0

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
CRISTAL_E0	keV	Central energy of the beam	12
CRISTAL_dE	keV	Energy half-bandwidth at the photon source	1e-4
CRISTAL_M1_angle	mrad	Grazing angle of the first (bendable) horizontal mirror	3
CRISTAL_M2_angle	mrad	Grazing angle of the second horizontal mirror	3
CRISTAL_M1_radius	m	Bending radius of mirror M1 (0=flat)	0
CRISTAL_M2_radius	m	Bending radius of mirror M2 (0=flat)	0
CRISTAL_M_coating	str	Mirror coating (Rh or Pt stripe), e.g. "Rh.txt" or "Pt.dat"	"Rh.txt"
CRISTAL_reflections			"LaB6_660b_AVID2.hkl"
splits			10

The SOLEIL_CRISTAL Instrument

Identification

Description

Examples

Input parameters

Links

The `SOLEIL_CRISTAL` Instrument