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Maaike Limper 11-8-2003

Visualization of the Optical Alignment System of the Muon Endcap Spectrometer in the H8-testbeam set-up. Maaike Limper 11-8-2003. Making pretty pictures!. Overview. ATLAS muon spectrometer The optical alignment system The ARAMYS-program Visualization using SVG

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Maaike Limper 11-8-2003

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  1. Visualization of the Optical Alignment System of the Muon Endcap Spectrometer in the H8-testbeam set-up Maaike Limper 11-8-2003 Making pretty pictures!

  2. Overview • ATLAS muon spectrometer • The optical alignment system • The ARAMYS-program • Visualization using SVG • Display interface (svg, html, javascript) • Next steps

  3. The ATLAS muon spectrometer

  4. Precision • Curvature of track gives momentum • Sagitta precision of 500 to 50 µm • In principle you need only relative position of the 3 chambers traversed • Due to position of the endcap chambers, alignment bars required

  5. Alignment components • RASNIK: consists of 3 elements, CCD, lens and LED+mask • BCAM: CCD camera looking at 2 laser diodes from large distance • Alignment bar: contains 3 RASNIKs, BCAMs measure relative position of bars

  6. The optical alignment system • 6 alignment bars • 18 in-bar and 24 chambers RASNIKs (deformations) • 12 BCAMs form 4 polar lines • 12 BCAms form 6 azimuthal lines • 15 proximity sensors connect chambers to bars

  7. ARAMYS • Alignment reconstruction program made by Christoph Amelung • C-code that turns data from alignment system into actual positions • Generate data-file with 3d line co-ordinates • My work: make pretty pictures!

  8. Scalable Vector Graphics • Format to make 2d graphics and animations for WWW (the new flash?) • Needs interface for different component display, rotations and movements • SVG embedded in html, javascript for interactivity

  9. SVG example <?xml version="1.0" standalone="no"?> <svg width="33cm" height="20cm" viewBox="-20000 -6000 25000 15000"> <title>The optical alignment system for muon-endcap spectrometer</title> <g id="chambers" visibility="visible"> <line id="line_0" x1="-1435.429" x2="-1758.130" y1=" 61.820" y2="148.262" stroke="black" stroke-width="10"/> <line id="fake_0" x1="-2114.433" x2="-2115.645" visibility="hidden"/> <line id="line_1" x1="-1544.478" x2="-1867.178" y1="-322.676" y2="-236.234" stroke="black" stroke-width="10"/> <line id="fake_1" x1="-502.347" x2="-503.559" visibility="hidden"/> Etc … </g> </svg>

  10. DEMO

  11. 3 more weeks to go… • Implement movements of bars and sensors • Implement deformations of chambers • Improved interface (more options, prettier lay-out?)

  12. Any questions?

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