Title:
METHOD OF ENERGY CALIBRATION FOR A PLANE GRATING MONOCHROMATOR
Document Type and Number:
WIPO Patent Application WO/2023/284915
Kind Code:
A3
Abstract:
The invention relates to a method of energy calibration for a plane grating monochromator (PGM) which comprises a plane grating and a plane mirror, both of which are equipped with a drive with an angle decoder with an absolute scale. The method comprises the following steps: 1. providing the PGM and collimated x-ray radiation and an ionization chamber in the beam path downstream of the PGM, and a detector for detecting radiation arising in the ionization chamber. 2. searching for a first extremal value (EW) of the photoionization spectrum of the gas in the ionization chamber by varying the overall deflection angle 2θ at the PGM and the diffraction angle β of the plane grating and by determining, either by calculation on the basis of the energy of the first EW or by geodesy, an associated deflection angle θ of the plane mirror and calculating the associated angle value β of the plane grating and by assigning the angle values to the current graduation marks of the decoders as a starting point. Subsequently, in a step 3., (i) rotating the plane grating or the plane mirror until a second EW of the ionization spectrum adjacent to the first EW is reached and (ii) rotating the respective other one, in relation to (i), of plane mirror and plane grating back to the first EW of the ionization spectrum and, in the process, (iii) respectively forming pairs of the graduation marks of the decoders for each partial step (i) and (ii) of the rotations from the read initial graduation mark and the graduation mark when the respective next homed-in on EW is reached, and respectively assigning associated nominal angle differences between the energies of the two EWs of the ionization spectrum to the pairs of graduation marks. 4. repeating step 3. at least twice.
Inventors:
EGGENSTEIN FRANK (DE)
SCHWARZ LISA (DE)
ZESCHKE THOMAS (DE)
VIEFAAUS JENS (DE)
SCHWARZ LISA (DE)
ZESCHKE THOMAS (DE)
VIEFAAUS JENS (DE)
Application Number:
PCT/DE2022/100499
Publication Date:
March 02, 2023
Filing Date:
July 13, 2022
Export Citation:
Assignee:
HELMHOLTZ ZENTRUM BERLIN FUER MAT UND ENERGIE GMBH (DE)
International Classes:
G21K1/06
Other References:
EGGENSTEIN F ET AL: "New UHV angle encoder for high resolution monochromators, a modern spare part for the Heidenhain UHV RON 905", NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ELSEVIER BV * NORTH-HOLLAND, NL, vol. 1014, 21 July 2021 (2021-07-21), XP086784026, ISSN: 0168-9002, [retrieved on 20210721], DOI: 10.1016/J.NIMA.2021.165645
LEUTENEGGER M A ET AL: "High-Precision Determination of Oxygen-Kalpha Transition Energy Excludes Incongruent Motion of Interstellar Oxygen", ARXIV.ORG, CORNELL UNIVERSITY LIBRARY, 201 OLIN LIBRARY CORNELL UNIVERSITY ITHACA, NY 14853, 6 November 2020 (2020-11-06), XP081797253
LEUTENEGGER M A ET AL: "High-Precision Determination of Oxygen-Kalpha Transition Energy Excludes Incongruent Motion of Interstellar Oxygen", ARXIV.ORG, CORNELL UNIVERSITY LIBRARY, 201 OLIN LIBRARY CORNELL UNIVERSITY ITHACA, NY 14853, 6 November 2020 (2020-11-06), XP081797253
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