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 The optical alignment system for muon-endcap spectrometer Etc …

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?