How Many Revolutions Does a Proton Make in a Cyclotron?

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SUMMARY

A 66.0-cm-diameter cyclotron accelerates protons using a 530 V oscillating potential difference. The cyclotron frequency is calculated as f = 1.1 x 107 revolutions per second using the formula f = (q*B)/(2*pi*m). To determine the number of revolutions before the proton exits, one must calculate the proton's speed at the cyclotron's radius and its kinetic energy, considering that each revolution adds 2*530 eV to its energy. The conversion from electronvolts to joules is essential for accurate calculations.

PREREQUISITES
  • Understanding of cyclotron physics and operation
  • Familiarity with the concepts of electric potential and kinetic energy
  • Knowledge of the relationship between frequency, charge, magnetic field, and mass
  • Ability to convert energy units from electronvolts to joules
NEXT STEPS
  • Calculate the proton's speed at the radius of the cyclotron using v = r * f
  • Determine the total kinetic energy of the proton upon exiting the cyclotron
  • Explore the implications of varying the potential difference on proton acceleration
  • Investigate the effects of magnetic field strength on cyclotron frequency
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Physics students, educators, and professionals interested in particle acceleration and cyclotron design.

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Homework Statement



A 66.0-cm-diameter cyclotron uses a 530 V oscillating potential difference between the dees.

How many revolutions does the proton make before leaving the cyclotron?

Homework Equations



f = (q*B)/(2*pi*m)

The Attempt at a Solution



I find the cyclotron frequency:

f = ((1.6x10^-19)(0.69))/(2*pi*(1.67x10^-27)) = 1.1x10^7 rev/sec

I don't know where to go from there. How do I find the time it takes for the proton to leave the cyclotron?
 
Last edited:
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The proton will exit when it is at the radius of the cyclotron.
Can you find the proton's speed at that radius?
Can you find the proton's kinetic energy when it exits?
For every revolution, 2*530 eV are added to the proton's energy.
Put it together assuming that the proton starts with negligibly small kinetic energy. (Don't forget to convert eV to Joules).
 

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