1. Edwin Chng

2. Contents Decay Solenoid Electron Peak Muon Peak Slab Hits Appendix Slide 2

3. Decay Solenoid (DS) DS current reference at 669 Amps(run 2200) DS current varied from -15% to +20% TofTree and TofTrace ran on data to extract mean of x,y and the spread of the beam (σ) Run Number21912192219321952196219721982200 Current / Amps736602803769702635568669 Slide 3

4. Slide 4

5. Results Reference Slide 5

6. Reference Slide 6

7. Reference Slide 7

8. Electron Peak Value of electron peak investigated for runs 1592-2895 Value expected to stay constant as electrons are relativistic Missing data given in appendix TofTree code modified and ran on data Electron data fitted with Gaussian curve (see graph) Slide 8

9. Slide 9

10. Electron Peak Data extracted include mean with associated error and the number of the electrons Data with 10 counts or less eliminated from graph and also bad fits Slide 10

11. Results Mean 25.48 S.D. 0.04 Slide 11

12. Slide 12

13. Backward calculation showed the electrons to have a velocity larger than speed of light Distance – 7764 mm Average time – 25.48 ns Speed – 1.017 c Slide 13

14. Muon Peak Data analysed for reference runs (see appendix for list of reference run numbers) TofTree ran on data with mean, count and most probable extracted No fitting was done in this case because of the lack of a suitable theoretical fit Slide 14

15. Results Slide 15

16. Results Positive Polarity Negative Polarity Slide 16

17. Positive Polarity Negative Polarity Slide 17

18. Mean 28.29 S.D. 0.07 Slide 18

19. Slide 19

20. Slab hits Data analysed for reference runs Data extracted for successful slab hits (green) for Tof0(10slabs), Tof1(7slabs), Tof2(10slabs) Slide 20

21. Results Slide 21

22. Slide 22

23. Slide 23

24. Slide 24

25. Slide 25

26. Slide 26

27. Appendix Missing data : 1600 – 1623, 1653, 1760, 1763 – 1765, 1767 – 1774, 1776 – 1778, 1781 – 1783, 1787, 1791 – 1796, 1801 – 1804, 1828, 1840 – 1841, 1864,1866 1869, 1872 – 1873, 1875, 1877 – 1878, 1880 – 1881, 1889 – 1896, 1899 – 1900, 1906, 1908, 1916 – 1921, 1925, 1927, 1932 – 1933, 1936, 1938 – 1941, 1944, 1949, 1952, 1956, 1960, 1962, 1970 – 1971, 2046, 2049, 2086, 2088, 2090, 2239, 2323 – 2340, 2405 – 2410, 2589 Reference runs: 2204 – 2211, 2223, 2238, 2241, 2243-2245, 2253-2256, 2272 – 2276, 2303, 2396, 2398, 2423, 2444, 2446, 2462, 2466, 2482, 2498 – 2502, 2514, 2525, 2534, 2538 – 2539, 2553 – 2555, 2561 – 2562, 2640, 2702, 2726, 2734, 2743, 2767, 2803, 2846, 2873 Slide 27

28. Thank You