Data Analysis

Edwin Chng

ContentsDecay SolenoidElectron PeakMuon PeakSlab HitsAppendix

Slide 2

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 Number 2191

2192

2193

2195

2196

2197

2198

2200

Current / Amps 736 602 803 769 702 635 568 669

Slide 3

Slide 4

Results

550.00 600.00 650.00 700.00 750.00 800.00

-25

-15

-5

5

15

25

35

X

DS current / Amps

Mean

X /

mm

Reference

Slide 5

550.00 600.00 650.00 700.00 750.00 800.00

-25

-15

-5

5

15

25

35

Y

DS current / Amps

Mean

y /

mm

Reference

Slide 6

550.00 600.00 650.00 700.00 750.00 800.00 850.0050

55

60

65

70

75

80

85

90

XY

Decay Solenoid Current / Amps

σ/m

m

Reference

Reference

Slide 7

Electron PeakValue of electron peak investigated

for runs 1592-2895Value expected to stay constant as

electrons are relativisticMissing data given in appendix TofTree code modified and ran on

dataElectron data fitted with Gaussian

curve (see graph) Slide 8

Slide 9

Electron PeakData extracted include mean with associated

error and the number of the electronsData with 10 counts or less eliminated from

graph and also bad fits

Slide 10

Results

25.3

25.3

2

25.3

4

25.3

6

25.3

825

.4

25.4

2

25.4

4

25.4

6

25.4

825

.5

25.5

2

25.5

4

25.5

6

25.5

825

.6

25.6

2

25.6

4

25.6

6

25.6

825

.7

Mor

e0

20

40

60

80

100

120

140

Histogram

Bin

Fre

qu

en

cy

Mean 25.48S.D. 0.04

Slide 11

1592 1792 1992 2192 2392 2592 279225.3

25.35

25.4

25.45

25.5

25.55

25.6

25.65

25.7Mean

Run Number

tim

e/n

s

Slide 12

Backward calculation showed the electrons to have a velocity larger than speed of light

Distance – 7764 mmAverage time – 25.48 nsSpeed – 1.017 c

Slide 13

Muon PeakData 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

Results

2204 2304 2404 2504 2604 2704 280428.1

28.15

28.2

28.25

28.3

28.35

28.4

28.45

28.5

Mean

Run Number

tim

e/n

s

Slide 15

Results

2204 2304 2404 2504 2604 2704 280428.1

28.15

28.2

28.25

28.3

28.35

28.4

28.45

28.5

Mean

Run Number

tim

e/n

s

Positive Polarity

Negative Polarity

Slide 16

Positive Polarity

Negative Polarity

Slide 17

28.1

28.1

2

28.1

4

28.1

6

28.1

828

.2

28.2

2

28.2

4

28.2

6

28.2

828

.3

28.3

2

28.3

4

28.3

6

28.3

828

.4

28.4

2

28.4

4

28.4

6

28.4

828

.5

Mor

e0

2

4

6

8

10

12

14

16

18

Histogram

Bin

Fre

qu

en

cy Mean 28.29

S.D. 0.07

Slide 18

2204 2304 2404 2504 2604 2704 280428

28.1

28.2

28.3

28.4

28.5

28.6

28.7

28.8

Most Probable

Run Number

tim

e/n

s

Slide 19

Slab hitsData analysed for reference runsData extracted for successful slab

hits (green) for Tof0(10slabs), Tof1(7slabs), Tof2(10slabs)

Slide 20

Results

2204 2304 2404 2504 2604 2704 28040

0.02

0.04

0.06

0.08

0.1

0.12

tof0 slab hits (x)

Bin 2

Run Number

Fra

cti

on

Slide 21

2204 2304 2404 2504 2604 2704 28040

0.02

0.04

0.06

0.08

0.1

0.12

tof0 slab hits (y)

Bin 2

Run Number

Fra

cti

on

Slide 22

2204 2304 2404 2504 2604 2704 28040

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.09

0.1

tof1 slab hits (x)

Bin 1

Run Number

Fra

cti

on

Slide 23

2204 2304 2404 2504 2604 2704 28040

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.09

0.1

tof1 slab hits (y)

Bin 1

Run Number

Fra

cti

on

Slide 24

2204 2304 2404 2504 2604 2704 28040

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

tof2 slab hits (x)

Bin 4

Run Number

Fra

cti

on

Slide 25

2204 2304 2404 2504 2604 2704 28040

0.05

0.1

0.15

0.2

0.25

tof2 slab hits (y)

Bin 4

Run Number

Fra

cti

on

Slide 26

AppendixMissing 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

Thank You