Relativistic Dynamics: Testing Relativity and. Determining Properties of the Electron
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1 Relativistic Dynamics: Testing Relativity and Determining Properties of the Electron Jason Gross MIT - Department of Physics Jason Gross (8.13) Relativistic Dynamics December 13, / 34
2 Goals Test relativity (vs. Newton) Determine m e and e Diagnose systematic errors Jason Gross (8.13) Relativistic Dynamics December 13, / 34
3 Special Relativity Fast things Length contraction Time dilation Universal speed limit (c) Jason Gross (8.13) Relativistic Dynamics December 13, / 34
4 Special Relativity Fast things Length contraction Time dilation Universal speed limit (c) Jason Gross (8.13) Relativistic Dynamics December 13, / 34
5 Special Relativity Fast things Length contraction Time dilation Universal speed limit (c) Jason Gross (8.13) Relativistic Dynamics December 13, / 34
6 Special Relativity Fast things Length contraction Time dilation Universal speed limit (c) Jason Gross (8.13) Relativistic Dynamics December 13, / 34
7 Testing Relativity Q: Why do we care? A: Jason Gross (8.13) Relativistic Dynamics December 13, / 34
8 Testing Relativity Q: Why do we care? A: Because relativity is awesome! Jason Gross (8.13) Relativistic Dynamics December 13, / 34
9 Testing Relativity Q: Why do we care? A: Because it s required to understand things moving quickly. Jason Gross (8.13) Relativistic Dynamics December 13, / 34
10 Relativity Applications GPS (2 km / day) Images from and Jason Gross (8.13) Relativistic Dynamics December 13, / 34
11 Relativity Applications GPS (2 km / day) Images from and Jason Gross (8.13) Relativistic Dynamics December 13, / 34
12 Testing Relativity Q: How do we test it? A: Jason Gross (8.13) Relativistic Dynamics December 13, / 34
13 Testing Relativity Q: How do we test it? A: Move really, really quickly! Jason Gross (8.13) Relativistic Dynamics December 13, / 34
14 Testing Relativity Q: What moves really, really fast? A: Jason Gross (8.13) Relativistic Dynamics December 13, / 34
15 Testing Relativity Q: What moves really, really fast? A: Light! Jason Gross (8.13) Relativistic Dynamics December 13, / 34
16 Testing Relativity Q: What moves really, really fast? A: Light! Jason Gross (8.13) Relativistic Dynamics December 13, / 34
17 Testing Relativity Q: What moves really, really fast? A: Electrons! e- ( 9 Sr.564 MeV.77c) Jason Gross (8.13) Relativistic Dynamics December 13, / 34
18 Testing Relativity Q: What moves really, really fast? A: Electrons! e- ( 9 Sr.564 MeV.77c) Jason Gross (8.13) Relativistic Dynamics December 13, / 34
19 Testing Relativity Q: What moves really, really fast? A: Electrons! e- ( 9 Y 2.28 MeV.97c) Jason Gross (8.13) Relativistic Dynamics December 13, / 34
20 Theory & Experiment Three points of contact: p F = d p/dt K Jason Gross (8.13) Relativistic Dynamics December 13, / 34
21 Theory & Experiment Three points of contact: p F = d p/dt K Jason Gross (8.13) Relativistic Dynamics December 13, / 34
22 Theory & Experiment Three points of contact: p F = d p/dt K Jason Gross (8.13) Relativistic Dynamics December 13, / 34
23 Theory & Experiment Three points of contact: p F = d p/dt K Jason Gross (8.13) Relativistic Dynamics December 13, / 34
24 The Apparatus I Velocity Selector Plate Separation =.18 ±.3 cm Length = 1 cm Digital Voltmeter Fluke 812A and B VS Vacuum Chamber Torr 4.6 ±.4 cm PIN 9 Sr/ 9 Y Source Preamp Canberra Mo. 23BT Amplifier Ortec 471 Velocity Selector HV Supply: -5 V Canberra Mo. 23BT Bias Voltage Supply: 7 V EG&G Ortec 428 Oscilloscope Multi-Channel Analyzer From FIG. 1: Schematic diagram of the electron trajectory in the Thu the nea dep A reve cord fit b tion of t as t Jason Gross (8.13) Relativistic Dynamics December 13, / 34
25 Magnetic Force VS PIN B 4.6 ±.4 cm 9 Sr/ 9 Y Source Jason Gross (8.13) Relativistic Dynamics December 13, / 34
26 Magnetic Force q v B = F = ω p = v ρ ρ 2 p B = p eρ Jason Gross (8.13) Relativistic Dynamics December 13, / 34
27 Magnetic Force q v B = F = ω p = v ρ ρ 2 p B = p eρ Jason Gross (8.13) Relativistic Dynamics December 13, / 34
28 Electric Force VS PIN B 4.6 ±.4 cm 9 Sr/ 9 Y Source Jason Gross (8.13) Relativistic Dynamics December 13, / 34
29 Electric Force qe + q v B = F = β = v/c = E cb Jason Gross (8.13) Relativistic Dynamics December 13, / 34
30 Electric Force qe + q v B = F = β = v/c = E cb Jason Gross (8.13) Relativistic Dynamics December 13, / 34
31 The Apparatus I Velocity Selector Plate Separation =.18 ±.3 cm Length = 1 cm Digital Voltmeter Fluke 812A and B VS Vacuum Chamber Torr 4.6 ±.4 cm PIN 9 Sr/ 9 Y Source Preamp Canberra Mo. 23BT Amplifier Ortec 471 Velocity Selector HV Supply: -5 V Canberra Mo. 23BT Bias Voltage Supply: 7 V EG&G Ortec 428 Oscilloscope Multi-Channel Analyzer FIG. 1: Schematic diagram of the electron trajectory in the Jason Gross (8.13) Relativistic Dynamics December 13, / 34 Thu the nea dep A reve cord fit b tion of t as t
32 Predictions Classical Mechanics: p = m v Relativity: p = γm v with γ = 1/ 1 β 2 Jason Gross (8.13) Relativistic Dynamics December 13, / 34
33 Expectations Β Classical 1..8 Relativistic Jason Gross (8.13) Relativistic Dynamics December 13, / 34
34 Finding E B 92 G counts 3 s counts 3 s counts 3 s counts 3 s E kv counts 3 s B 96 G counts 3 s B 1 G counts 3 s B 14 G counts 3 s B 18 G E kv E kv E kv E kv B 112 G B 116 G B 12 G counts 3 s E kv counts 3 s E kv counts 3 s E kv Jason Gross (8.13) Relativistic Dynamics December 13, / 34
35 Results Β Χ Ν 2 Classical Χ Ν 2 Relativistic 9. Classical 1..8 Relativistic.6.4 Jason Gross (8.13) Relativistic Dynamics December 13, / 34
36 Results Β Χ ΝClassical Χ ΝRelativistic 9. Classical Relativity Wins! Relativistic.6.4 Jason Gross (8.13) Relativistic Dynamics December 13, / 34
37 Results There s a systematic error. How far are we off? Are either of these actually good models? Jason Gross (8.13) Relativistic Dynamics December 13, / 34
38 Results There s a systematic error. How far are we off? Are either of these actually good models? Jason Gross (8.13) Relativistic Dynamics December 13, / 34
39 Results There s a systematic error. How far are we off? Are either of these actually good models? Jason Gross (8.13) Relativistic Dynamics December 13, / 34
40 How far? Q: How far are we off? Use e m e as a fit parameter. Fit Value: 1.545(2) 1 11 C kg 1 cf (39) 1 11 C kg 1 Jason Gross (8.13) Relativistic Dynamics December 13, / 34
41 How far? Q: How far are we off? Use e m e as a fit parameter. Fit Value: 1.545(2) 1 11 C kg 1 cf (39) 1 11 C kg 1 Jason Gross (8.13) Relativistic Dynamics December 13, / 34
42 How far? Q: How far are we off? Use e m e as a fit parameter. Fit Value: 1.545(2) 1 11 C kg 1 cf (39) 1 11 C kg 1 Jason Gross (8.13) Relativistic Dynamics December 13, / 34
43 How far? Q: How far are we off? Use e m e as a fit parameter. Fit Value: 1.545(2) 1 11 C kg 1 cf (39) 1 11 C kg 1 Jason Gross (8.13) Relativistic Dynamics December 13, / 34
44 Good models? Β Std. Residuals Χ Ν Jason Gross (8.13) Relativistic Dynamics December 13, / 34
45 Good models? Β Std. Residuals Χ Ν Jason Gross (8.13) Relativistic Dynamics December 13, / 34
46 Systematic Error: ρ? Β Std. Residuals Ρ Χ Ν 2.29 Ρ fit ±.23 cm Ρ 2.3 ±.2 cm Jason Gross (8.13) Relativistic Dynamics December 13, / 34
47 Systematic Error: d? Β Std. Residuals Χ Ν d fit ±.29 cm d.18 ±.3 cm d fit d.123 ±.29 cm Jason Gross (8.13) Relativistic Dynamics December 13, / 34
48 Systematic Error: B? Β Std. Residuals Χ Ν 2.7 B fit B B 1 B B.57 ±.35 B 1.7 ± 3.5 G Jason Gross (8.13) Relativistic Dynamics December 13, / 34
49 Systematic Error: V? Β Χ 2 Ν.1 V fit V V V 1 V.65 ±.33 V.2 ±.12 kv Jason Gross (8.13) Relativistic Dynamics December 13, / 34
50 Kinetic Energy Classical Mechanics: K = p 2 /2m Relativity: K = p 2 c 2 + m 2 c 4 mc 2 p = Beρ Jason Gross (8.13) Relativistic Dynamics December 13, / 34
51 Kinetic Energy Classical Mechanics: K = p 2 /2m Relativity: K = p 2 c 2 + m 2 c 4 mc 2 p = Beρ Jason Gross (8.13) Relativistic Dynamics December 13, / 34
52 Kinetic Energy Classical Mechanics: K = p 2 /2m Relativity: K = p 2 c 2 + m 2 c 4 mc 2 p = Beρ Jason Gross (8.13) Relativistic Dynamics December 13, / 34
53 Expectations 12 1 K p 2 2 m e K kev 8 6 K c 4 m 2 c 2 p 2 c 2 m Ρ Jason Gross (8.13) Relativistic Dynamics December 13, / 34
54 Energy Calibration log Count Ba 133 Calibration kev kev kev kev kev kev kev kev kev kev kev kev kev kev kev kev Channel Jason Gross (8.13) Relativistic Dynamics December 13, / 34
55 Energy Calibration kev Std. Residuals 2 1 kev channel.4561 ± ±.8 Χ Ν Jason Gross (8.13) Relativistic Dynamics December 13, / 34
56 Energy Peaks 8 G 84 G 88 G 92 G G G G Jason Gross (8.13) G G G G Relativistic Dynamics December 13, / 34
57 K vs. p 6 K p 2 2 m e K kev K c 4 m 2 c 2 p 2 c 2 m Data Ρ Jason Gross (8.13) Relativistic Dynamics December 13, / 34
58 e and m e K kev Std. Residuals Χ Ν 2.84 m e 1.3 ± kg e 1.63 ± C Jason Gross (8.13) Relativistic Dynamics December 13, / 34
59 e and m e : Values Fit m e : (1.3 ±.23) 1 3 kg cf (4) 1 31 kg Fit e: (1.63 ±.14) 1 19 C cf (35) 1 19 C Jason Gross (8.13) Relativistic Dynamics December 13, / 34
60 e and m e : Values Fit m e : (1.3 ±.23) 1 3 kg cf (4) 1 31 kg Fit e: (1.63 ±.14) 1 19 C cf (35) 1 19 C Jason Gross (8.13) Relativistic Dynamics December 13, / 34
61 e and m e : Error ρ = (2.3 ±.2) cm: ±.5 Gauss in B: K : Jason Gross (8.13) Relativistic Dynamics December 13, / 34
62 e and m e : Error ρ = (2.3 ±.2) cm: 65% of the error ±.5 Gauss in B: K : Jason Gross (8.13) Relativistic Dynamics December 13, / 34
63 e and m e : Error ρ = (2.3 ±.2) cm: 65% of the error ±.5 Gauss in B: K : Jason Gross (8.13) Relativistic Dynamics December 13, / 34
64 e and m e : Error ρ = (2.3 ±.2) cm: 65% of the error ±.5 Gauss in B: 33% of the error K : Jason Gross (8.13) Relativistic Dynamics December 13, / 34
65 e and m e : Error ρ = (2.3 ±.2) cm: 65% of the error ±.5 Gauss in B: 33% of the error K : Jason Gross (8.13) Relativistic Dynamics December 13, / 34
66 e and m e : Error ρ = (2.3 ±.2) cm: 65% of the error ±.5 Gauss in B: 33% of the error K : 2% of the error Jason Gross (8.13) Relativistic Dynamics December 13, / 34
67 Conclusion Relativity wins! Jason Gross (8.13) Relativistic Dynamics December 13, / 34
68 Thank You! Any questions? Jason Gross (8.13) Relativistic Dynamics December 13, / 34
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