1 Measuring masses and momenta u Measuring charged particle momenta. u Momentum and Special Relativity. u Kinetic energy in a simple accelerator. u Total.

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Presentation transcript:

1 Measuring masses and momenta u Measuring charged particle momenta. u Momentum and Special Relativity. u Kinetic energy in a simple accelerator. u Total energy, mass and momentum. u Measuring masses.

2 Motion of Charged Particle in a Magnetic Field B-field v F u Charge Q, magnetic field strength B. u Velocity v, normal to magnetic field. u Lorentz force F, normal to directions of B and v. u Magnitude of force u Circular path.

3 Measuring momentum u Centripetal force u Equate Lorentz and centripetal forces

4 Momentum and Special Relativity u Measurement of momentum against speed for an electron u Must redefine momentum to keep conservation of momentum u Relativistic momentum: electron momentum (kg m/s) electron velocity (1/c)

5 Kinetic energy in a simple accelerator u Remember two rules: Work done = _____ x ________. Change in K.E. = work done. u Build an accelerator to check this: electron gun accelerator plates velocity measurement

6 Kinetic energy cont. u More measurements: u If want to keep K.E. = work done, define: where work done (mc 2 ) v 2 (1/c 2 )

7 Energy and mass u Have seen: so know E = mc 2 (ignoring K.E.). u Putting it all together: u Remembering can show that and

8 An aside, units u We have  Multiply p by c to get energy But Q = 1.6 x C for e,  etc.  Now c = 3 x 10 8 m s -1 so: u Finally, express p in units of GeV / c:

9 PC Exercise 2 u Use PC to do following experiment: Side view End view e+e+ e-e-  +,  +, K + or p  -,  -, K - or p B field  -,  -, K - or p  +,  +, K + or p Measure r, hence get p E known

10 PC exercise 2 cont. u Using known energy (from energy conservation) and momentum (from r measurement) calculate mass: u Compare with known particle masses, can you identify the particles?