# I New Way of Particle Accelerating?

1. Apr 21, 2017

### BenjaminLovesQM

Question 1:
Current particle accelerators are only able to speed up particles up to around 0.16c. However, in nuclear reactors, radioactive nuclei release subatomic particles, i.e. electrons, at more than 0.75c. To increase efficiency and perhaps to observe how particles collide at high speeds, would it be possible to use a magnetic field to control the direction of the emitted electrons by radioactive substances? Where we put two identical radioactive particles in the particle accelerator (i.e. Ra-228), such that the half lives are equal. When they emit radiation, can we alter their random emission direction by applying a magnetic field, so that the particles collide?

Question 2:
To ensure a higher chance of radiation emission, can we use the Quantum Zeno effect, to increase the chance for which particles decay?

2. Apr 22, 2017

### Orodruin

Staff Emeritus
This is not correct. LHC protons travel very close to the speed of light with $c-v \simeq m^2c^5/(2E^2)$. This is slightly more than 1 m/s or $4.5\cdot 10^{-9}c$.

3. Apr 22, 2017

### BenjaminLovesQM

Oh ok, sorry for the wrong info. But I'd like to ask: would the method work? Thanks!!

4. Apr 22, 2017

### Staff: Mentor

...less than $c$? (i.e. $v \approx c - 1~\rm{m/s}$)

5. Apr 22, 2017

### Orodruin

Staff Emeritus
Well, the quantity I quoted was $c-v$ so if that is positive $v < c$. Alternatively, $v \simeq 0.999999995c$.

6. Apr 22, 2017

### Staff: Mentor

D'oh... the connection slipped past me there.

7. Apr 22, 2017

### BenjaminLovesQM

Right, so would this method work? Driven by curiosity...

8. Apr 22, 2017

### ZapperZ

Staff Emeritus
I'm not sure I fully understand your question, because the issue has been rather obvious.

We steer charge particles using magnetic field. That is why there is such a thing as "bending magnets". It is what we used to steer and control the direction of particles in accelerators. In fact, we use magnets of different configurations to bend, focus, steer, etc... these particles.

So I don't know exactly if this is what you didn't know before, or if I'm missing something else.

And BTW, "waiting" for particles to be emitted is a very inefficient way to have a particle source for particle accelerators. Also note that for electrons, it takes almost no effort to get it close, VERY close, to "c". All the physics that we use to model particle beams simply uses "c" as the speed of electrons once it achieves MeV energy scale. This is easily achieved just from electrons coming out of a photoinjector already without having them pass through any additional accelerating structures.

Zz.

9. Apr 22, 2017

### Staff: Mentor

You cannot. You can change their direction once they got emitted, but you cannot properly focus radioactive decay products due to their random initial motion.

While it is possible to have decay products from two sources collide, the probability is utterly negligible. You would probably have to wait for years to accumulate a few collisions, something particle accelerators can deliver in seconds (at much higher collision energies).
You cannot.

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