1. Calibration of clinometers for the alignment of muon chambers in the CMS experiment. Thomas MOSCHOUTIS, Marion RIPERT and Georgia KARAGIORGI with Dr HOHLMANN and Dr CARAWAY Florida Academy of Science – F.S.U., Tampa, 18 Mars 2005

2. Global view of the Compact Muon Solenoid

3. View of one Disk Dual-axis clinometers for monitoring orientation of transfer pates:

4. Calibration bench CIinometer sensing Liquid calibrated Linear mover Θ

5. Error calculation Error in φ: –φ =Tan -1 (L/H) –σ φ =(∂φ/∂L)*σ L +(∂φ/∂H)*σ H =(1/(L+H))*σ L -2L/(H 2 +H*L)*σ H Using the same formula: –σ Ω =(1/(L+M))*σ L -2L/(M 2 +M*L)*σ M Taking ρ=cos-1(M/K) and M→0 –σ ρ =σ M /K So the total error is: –σ θ =(σ φ 2 +σ Ω 2 +σ ρ 2 ) 1/2 M K ρ φ L H

6. First test curve

7. Zero degree measurement Pendulum clinometer Long rod to get more precision

8. Problem induced by the plate thickness

9. Second test curve

10. The 6 different mounting plates Clinometer’s place

11. Next setup Linear mover Adapter Tilting base Mounting plate

12. Adaptable base plate

13. Laser 0 degree measurement Tube filled with colored water Plane that needs to be horizontal (with a mirror fixed perpendicularly) Rotary laser level Mirror Laser beam Above viewSide view of the installation

14. Sensor Response vs. Angle theta

15. References CERN web page: http://www.CERN.chwww.CERN.ch Dr HOLMANN web page: http://my.fit.edu/~hohlmann/ FIT PSS web site: http://pss.fit.edu