A2 Physics PH5 B-fields
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How does a Linear accelerator work?
- 1.Proton is accelerated to right towards -ve tube.
- 2. When proton inside tube, direction of pd changes (no force acting on it in tube).
- 3. When proton is in next gap second tube is negative.
- 4. Electric field accelerates it again
How does the proton maintain always being accelerated in the Linear accelerator
- 1. p.d synchronised, proton must be in tube to when pd changes direction.
- 2. Frequency remains constant
- 3. Increas the lengths of tube and gaps between them because proton is travelling a greater distance every time.
How does a cyclotron work?
- 1. Proton is accelerated across gap between 2 dees by an electric field.
- 2. The magnetic field maintains circular motion
- 3. Speed of proton increases so radius of circle increases.
- 4. Proton spirals out and leaves cycloton.
Is the frequency changing in a cyclotron?
No, frequency is a constant. Equate circular acceleration and force on a charged particle, get frequency and see the constants.
How does a synchrotron work?
- 1. Speed increase due to changing electric field.
- 2. Charged particles performing circular motion due to B-field.
- 3. Acceleration occur 4 times per orbit.
How does synchrotron maintain constant radius?
- 1. B-field increases in strength as particles move quicker.
- 2. Frequency of ac supply increases.
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