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| URL | https://doi.org/10.18429/JACoW-MEDSI2025-THP52 |
|---|---|
| Title | Stability evaluation of a double crystal monochromator using an optical linear encoder |
| Authors |
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| Abstract | A dedicated jig with an optical linear encoder was developed to evaluate the pitching stability between the first and second crystals of a double crystal monochromator in a standalone configuration. This method does not require synchrotron radiation, enabling direct assessment of the monochromator's intrinsic stability. Unlike beamline-based measurements influenced by upstream optics, this approach isolates the monochromator's performance. Designed and implemented by Kohzu Precision, the system is currently applied to a symmetrical layout monochromator to assess angular stability in mechanically decoupled configurations. The encoder counter supports readout rates up to 12 MHz; however, considering the latch interval of the system, the effective sampling rate is about 5 kHz. Measurements were conducted at approximately 2 kHz. At a Bragg angle of 10 degrees, the angular stability (RMS) in the pitching direction was better than 20 nrad, and a dominant vibration peak was observed near 180 Hz. These results demonstrate the system's effectiveness in characterizing the stability of high-performance monochromator configurations. |
| Paper | download: THP52.pdf |
| Cite | BibTeX, LaTeX, Text/Word, RIS, EndNote |
| Conference | 13th Int. Conf. Mech. Eng. Des. Synchrotron Radiat. Equip. Instrum. (MEDSI'25) |
| Series | |
| Location | Lund, Sweden |
| Date | 15-19 Sep 2025 |
| Publisher | JACoW Publishing, Geneva, Switzerland |
| Editorial Board | Joaquín B. González Fernández, Karl Åhnberg, Staffan Benedictsson, Ana Martínez Carboneres, Niklas Johansson - MAX IV Laboratory. Jan Chrin - PSI. |
| Online ISBN | 978-3-95450-263-9 |
| Online ISSN | 2673-5520 |
| Received | 01 September 2025 |
| Revised | 15 September 2025 |
| Accepted | 18 September 2025 |
| Issued | 02 April 2026 |
| DOI | 10.18429/JACoW-MEDSI2025-THP52 |
| Pages | 395-398 |
| Copyright | Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI. |