Author: Vecina, L.E.P.
Paper Title Page
THMBCMO35 Piezo Motor Based Hardware Triggered Nano Focus Caustic Acquisition 1285
 
  • L.B.C. Campoi, G.S.R. Costa, N. Lopes Archilha, G.B.Z.L. Moreno, L.E.P. Vecina
    LNLS, Campinas, Brazil
 
  The eval­u­a­tion of the focus pro­duced by a KB (Kirk­patrick-Baez) mir­ror sys­tem is a chal­leng­ing en­deavor. In MOGNO (Micro and nano to­mog­ra­phy) beam­line’s case at Sir­ius, the KB was de­signed to pro­duce a focus of 150x150 nm2, re­quir­ing a setup to eval­u­ate the mir­rors’ align­ment in a timely man­ner. The de­vel­oped di­ag­nos­tic sys­tem is com­prised of a stack of three lin­ear in­er­tia drive piezo stages and a flu­o­res­cence de­tec­tor, ac­quir­ing data via hard­ware-trig­gered mesh scans. In the piezo stack, the stages are mounted along the X (hor­i­zon­tal, per­pen­dic­u­lar to the beam path), Z (along the beam path) and YZ beam­line di­rec­tions. More­over, the fact that a stage is placed at an angle re­quires the use of a kine­matic trans­for­ma­tion when scan­ing the focus along the Y axis, while the X axis scan can be done with a pure mo­tion. The mesh scan can be diveded in two parts: hard­ware trig­gered line scan ac­qui­si­tion along X or Y and soft­ware trig­gered steps along Z be­tween scans. In this man­ner, the con­trol is done via a col­lec­tion of low-level con­troller macros and Python scripts, such that dur­ing the scans, the piezo con­trollers com­mu­ni­cate with each other and the de­tec­tor via dig­i­tal pulses, or­ches­trated by the in-house TATU (Tim­ing and Trig­ger Unit) soft­ware*, re­duc­ing dead time be­tween ac­qui­si­tion points. The pro­posed sys­tem proved to be re­li­able to ac­quire beam pro­files, pro­vid­ing caus­tics in both hor­i­zon­tal and ver­ti­cal di­rec­tions. Cur­rently, the ac­quired focus caus­tics in­di­cate that the main source has a size of ap­prox­i­mately 480x500 nm2.
* TATU: A Flexible FPGA-Based Trigger and Timer Unit Created on CompactRIO for the First Sirius Beamlines ISBN 978-3-95450-221-9 ISSN 2226-0358 URL https://jacow.org/icalepcs2021/papers/thpv021.pdf
 
slides icon Slides THMBCMO35 [1.608 MB]  
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DOI • reference for this paper ※ doi:10.18429/JACoW-ICALEPCS2023-THMBCMO35  
About • Received ※ 06 October 2023 — Revised ※ 25 October 2023 — Accepted ※ 13 December 2023 — Issued ※ 20 December 2023
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