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Teaching Modern Physics - QuarkNet - Fermilab

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How is the speed increased?<br />

A. By varying the electric field from positive to negative<br />

1. Van de Graff or Cockcroft-Walton<br />

2. Linear<br />

B. The use of magnetic fields in cyclotrons and synchrotron<br />

Fc = Fb (using Fc = (mv 2 )/r and Fb = qvB…)<br />

v = (qrB)/m (so as v increases, B needs to increase.)<br />

Now, if v = 2πr/T or v = 2πrf, then:<br />

f = qB/2πm<br />

123

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