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Because of energy loss due to synchrotron radiation in the LHC at CERN, only 5.00 MeV is added to the energy of each proton during each revolution around the main ring. How many revolutions are needed to produce \(7.00-\mathrm{TeV}\) \((7000 \mathrm{GeV})\) protons, if they are injected with an initial energy of \(8.00 \mathrm{GeV}\) ?

Short Answer

Expert verified
To produce $7.00 \ \mathrm{TeV}$ (7000 GeV) protons in the LHC at CERN when injected with an initial energy of $8.00 \ \mathrm{GeV}$ and a gain of $5.00 \ \mathrm{MeV}$ per revolution due to synchrotron radiation, \(n = 1,398,400\) revolutions are required.

Step by step solution

01

Convert energy gain per revolution into GeV

We need to convert the given energy gained per revolution from MeV to GeV before setting up the equation. Since there are 1000 MeV in one GeV: Energy gained per revolution = \(5.00 \ \mathrm{MeV} \times \frac{1 \ \mathrm{GeV}}{1000 \ \mathrm{MeV}} = 0.005 \ \mathrm{GeV}\).
02

Setup an equation to find the number of revolutions required

Let's denote the number of revolutions as "n". We can set up the following equation to find n: Initial energy + (energy gained per revolution × number of revolutions) = final energy. \(8.00 \ \mathrm{GeV} + (0.005 \ \mathrm{GeV} \times n) = 7000 \ \mathrm{GeV}\)
03

Solve for the number of revolutions required

To solve for n, we need to first subtract the initial energy from both sides, and then divide both sides by the energy gained per revolution: \(n = \frac{7000 \ \mathrm{GeV} - 8.00 \ \mathrm{GeV}}{0.005 \ \mathrm{GeV}}\)
04

Calculate the number of revolutions required

Now we can plug the values into our equation: \(n = \frac{6992}{0.005} = 1,398,400\) So, 1,398,400 revolutions are needed to produce 7.00 TeV (7000 GeV) protons if they are injected with an initial energy of 8.00 GeV.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Large Hadron Collider (LHC)
The Large Hadron Collider (LHC) at CERN is the world's largest and most powerful particle accelerator. It is an engineering marvel designed to push the boundaries of human knowledge about the physics of the universe. The LHC accelerates protons to nearly the speed of light before smashing them into each other. These high-energy collisions can create new particles, confirm the existence of theorized particles, and help understand the fundamental forces of nature.

The LHC consists of a 27-kilometer ring of superconducting magnets, with numerous accelerating structures to boost the energy of the particles along the way. The data collected from the collisions is used to explore the fundamental particles that make up everything in the universe, including the Higgs Boson, which was discovered at the LHC in 2012.
Proton Acceleration
Proton acceleration is a key aspect of the experiments conducted at the LHC. By understanding how to accelerate protons to incredibly high speeds, researchers can induce collisions that reveal the properties of subatomic particles. Acceleration is achieved through the use of electric fields, which are applied in a synchronized manner to push the protons forward every time they pass through an accelerating structure.

To reach the desired energy, protons must make numerous revolutions around the LHC ring. The LHC uses a complex system of magnets to guide these protons around the circular track. As the protons gain energy with each revolution, they cover the circumference of the accelerator ring in a fraction of a second, completing millions of revolutions before colliding with targets or other protons.
GeV to MeV Conversion
When dealing with the energies of particles in accelerators like the LHC, it is common to see the units giga-electronvolts (GeV) and mega-electronvolts (MeV). Understanding the conversion between these units is crucial for calculating the energy levels involved in particle acceleration.

One giga-electronvolt (1 GeV) is equal to 1,000 mega-electronvolts (1,000 MeV). The conversion is straightforward but vital for performing accurate calculations. For example, the energy gain of 5.00 MeV per revolution mentioned in the exercise needs to be converted into the same unit as the final energy, which is GeV, to determine how many revolutions are required for the protons to reach the target energy of 7.00 tera-electronvolts (TeV) or 7000 GeV.
Energy Loss in Particle Accelerators
Energy loss is a significant consideration in the operation of particle accelerators. As charged particles like protons are accelerated and bent along the curved path of the accelerator, they emit radiation known as synchrotron radiation. This emission leads to energy loss and represents a limitation to the maximum energy that can be reached in a given accelerator design.

In the LHC, protons lose a tiny amount of energy as synchrotron radiation with each revolution. Add up over countless revolutions, these energy losses require compensating accelerator mechanisms to ensure that the protons continue to gain overall energy. The example given in the problem illustrates how critical it is to calculate and compensate for this energy loss effectively: each proton in the problem gains only 5.00 MeV with each turn of the main ring. This incremental energy gain must overcome any losses to help the protons achieve the very high energies necessary for groundbreaking physics experiments.

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Most popular questions from this chapter

(a) Calculate the relativistic quantity \(\gamma=\frac{1}{\sqrt{1-v^{2} / c^{2}}}\) for 1.00 -TeV protons produced at Fermilab. (b) If such a proton created a \(\pi^{+}\) having the same speed, how long would its life be in the laboratory? (c) How far could it travel in this time?

The peak intensity of the CMBR occurs at a wavelength of \(1.1 \mathrm{mm}\). (a) What is the energy in eV of a 1.1-mm photon? (b) There are approximately \(10^{9}\) photons for each massive particle in deep space. Calculate the energy of \(10^{9}\) such photons. (c) If the average massive particle in space has a mass half that of a proton, what energy would be created by converting its mass to energy? (d) Does this imply that space is "matter dominated"? Explain briefly.

When both an electron and a positron are at rest, they can annihilate each other according to the reaction \(e^{-}+e^{+} \rightarrow \gamma+\gamma\). In this case, what are the energy, momentum, and frequency of each photon?

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In the past, many scientists believed the universe to be infinite. However, if the universe is infinite, then any line of sight should eventually fall on a star's surface and the night sky should be very bright. How is this paradox resolved in modern cosmology?

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