EMU Alignment System Analog Data Analysis for ME+1 y ME+4 Stations Run: Aug 25-28, 2006

1. Endcap Muon Meeting at CERN Sept 18-19, 2006 • EMU Alignment System • Analog Data Analysis • for ME+1yME+4 Stations • Run: Aug 25-28, 2006 • Magnetic field up to 4.0 Tesla • Contents: • Z-sensors • R-sensors • Proximity sensors • Biaxial Inclinometers • Temperature sensors • Summary

2. Cable connection EMU Alignment system The EMU Alignment Project task is to determine and monitor the position of CSC relative to each other and to the MAB. The alignment uncertainty should be comparable to the chamber resolution and it is defined as 75 mm for ME1/2 and 150mm for the others stations. The temperature must be measured with ±0.1° C precision.

3. P2 Z1 Z1 Z1 P3 Z1 P1 Z2 P4 YE+1 YE+2 YE+3 P6 P5 Z2 Z2 Z2 Z-sensors P1 - 15° P2 - 75° P3 - 135° P4 - 195° P5 - 255° P6 - 315° Scale factor: - Z1 (Keyence LB-70) station ME+1 only: 1.01 +/- 0.1 V/ cm - Z1, Z2 (linear potentiometer) 0.93 +/- 0.01 1/ cm All (12) installed Z1 were broken during the disk closing. Only one Z1 sensor (ME+2, point 5) is probably good

4. P2 P3 P1 P4 P6 P5 Z-1 Sensors: ME+1 Station Z1 YE+1 6 laser displacement sensors were mounted on theYE+1 disk but only 3 MABs on YB2. ANSYS calculation (EMU TDR, page C7) shows a distortion in Z-direction of endcap disks (outer edges) for about 6 mm that is in good agreement with Z1 laser displacement sensor data for upper point 2 but for lower point 5 and 6 the disk bend deformations are less than predicted. No linear dependence verses magnetic field was observed

5. Proximity sensor Transfer Plate Proximity Sensors (ME+1 Station) Y Pt. 2 Px6/2 Px6/1 Pt. 3 S1-S6 Sectors Px2/2 Pt. 1 S2 Px2/1 S3 S1 P1 - 15° P2 - 75° P3 - 135° P4 - 195° P5 - 255° P6 - 315° X S4 Pt. 4 S6 S5 Px1/1 Px1/2 Pt. 6 Pt. 5 Px1/1, Px2/1, Px3/1…. 36/1 Outer Ring Px1/2, Px2/2, Px3/2…. 36/2 Inner Ring Scale factor for proximity sensors: 0.918 +/- 0.003 1/ cm

6. Proximity Sensors: ME+1 Station (Sector4-6) Instability?

7. Chamber Displacements at 4.0T The distances between ME1/3 chambers increase with magnetic field and reached up to 700 mm at 4.0T. A good correlation between aluminum Z-stoppers and proximity sensor positions was found.

8. Radial Sensors ME2,3,4 Stations Y R2 R1 ME1 Station P2 R3 R2 P3 P1 X P1 - 15° P2 - 75° P3 - 135° P4 - 195° P5 - 255° P6 - 315° P4 P6 P5 Scale factor for R- sensors: 0.180 +/- 0.004 V/ cm

9. R- Sensors: ME+1 Station

10. Y P2 P3 P1 X P4 P6 P5 Distance between chambers verses magnetic field At magnetic field of 4.0 T: - the largest displacements between chambers (ME+1 station) do not exceed ~ 700 mm - chamber displacement relative to transfer plate is less than 300 mm

11. Inclinometers Y P2 Inclinometer 1 P3 Inclinometer 2 P1 X P4 Z P6 P5 P1 - 15° P2 - 75° P3 - 135° P4 - 195° P5 - 255° P6 - 315° Scale factor: 0.246 +/- 0.015 V / Arc degree  14.3 mV / mRad When the rotation is less than about 4 degrees, the direction and magnitude of the resultant tilt is quickly obtained from the vector sum of the X and Y tilt measurements. 

12. Inclinometers: ME+1 (Points 1-3)

13. ? Y P2 P3 P1 X P4 P6 P5 Inclinometers Results Disk Deformation The tilt angle for ME+1 station at Point 2 Is very large (~ 4 mrad). Tilts for point 2 and 5 should be equal but have opposite signs? Need to check inclinometer mounting on the disks

14. P2 P3 P1 P4 P6 P5 Temperature Measurements T1 T2 T3 P1 - 15° P2 - 75° P3 - 135° P4 - 195° P5 - 255° P6 - 315° Slope factor: T sensors: 1 degree K / 10 mV • All installed temperature sensors are working and have • reasonable data. • Temperature variations are similar to day/night ambient • temperature and do not exceed 2-3 degrees C. • No difference in T1, T2 and T3 data for upper points (1-4) • For lower points 5 and 6 (slice test chambers) there is a • temperature variation between sensors of 2-3 degrees C and • corresponds to a temperature distribution between the disk and • the working chambers.

15. ME+1 Station: Temperature Variations

16. PX sensors: Temperature Correlation ME1/3 chamber position drift is about~35 mm / oC

17. Summary • The measured displacement of YE+1 disk in Z direction is about 6 mm for point 2 and agreed with ANSYS calculations. Displacements for point 5 and 6 are lees for 2-3 mm. Non linear dependence displacement verses magnetic field was observed. • The distance between ME1/3 chambers (no overlapping) measured by proximity sensors is increased with field up to 700 mm at 4.0 T. ME1/3 chamber position drift at 4.0 T verses of temperature is about of 35 mm/ oC. • The R displacement between ME1/2 and ME1/3 chambers at 4.0T is about 600 mm and less than 300 mm for ME+2, 3 and 4 stations. The chamber displacements relative to transfer plates are small and do not exceed 100 -150 mm at 4.0 T for all stations. • The inclinometer data show that tilt angle for station ME+1 measured for the ME1/2 chamber at Point 2 is about 4 mrad. This data need to compare with HSLM DCOPS data. For all inclinometers mounted on the transfer plates data are similar for all stations. Tilt angle for points 2 and 5 have the equal value but have to be opposite signs. Need to check inclinometer mounting position on the transfer plates. • All temperature sensors present similar results. A temperature variation is correlated with ambient day/night temperature and do not exceed of 2-3 Co. Analog alignment system demonstrated a good performance and met technical specs