Is an accelerator the same thing as a collider?

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Discussion Overview

The discussion centers around the distinction between linear accelerators and colliders, particularly in the context of radiation from atomic orbiters and the validity of claims made by a specific source regarding linear accelerator experiments. Participants explore concepts from classical and quantum mechanics, as well as the implications of these concepts on the understanding of particle behavior in accelerators.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • Some participants question the reliability of a source that claims "innumerable linear accelerator experiments confirm that atomic orbiters DO NOT RADIATE at c/137," suggesting it lacks credibility.
  • One participant argues that linear accelerators, by definition, accelerate free particles, which do not possess orbitals, thus questioning how such experiments could confirm any claims about radiation from orbiters.
  • Another participant discusses classical relativistic speed in a Coulomb potential and presents a relationship involving angular momentum and the coupling constant, linking it to the original claim from the source.
  • Concerns are raised about the relevance of the classical mechanics discussion to linear accelerators, with some participants emphasizing that the two concepts are distinct.
  • Participants reference historical approaches to quantum mechanics, specifically Bohr's model, while also expressing uncertainty about modern definitions of particle behavior in quantum mechanics.
  • One participant clarifies that an accelerator is not synonymous with a collider, explaining their different functions and emphasizing that accelerators can operate without engaging in particle collisions.

Areas of Agreement / Disagreement

Participants generally disagree on the validity of the claims made by the referenced source, with some asserting that the statements are nonsensical while others attempt to connect them to established physics concepts. The distinction between accelerators and colliders remains a point of contention, with no consensus reached on the implications of the original claim.

Contextual Notes

Limitations include the lack of clarity on the definitions of terms like "orbiters" and the assumptions underlying the claims made in the original source. The discussion also reflects varying interpretations of classical and quantum mechanics principles.

erickalle
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Hi all,
Is the next quote true? If it has already been discussed here can anyone show the thread. Thanks.

Innumerable linear accelerator experiments confirm that atomic orbiters DO NOT RADIATE at c/137.
 
Physics news on Phys.org
"Innumerable linear accelerator experiments confirm that atomic orbiters DO NOT RADIATE at c/137."
You'll have to give more of the quote, or a reliable source.
 
www.newphysics2000.org/facts.htm

The reason I didn’t give the full reference is that this place looks a bit suspect to say the least. But I singled out point 5 of the fact sheet because of the assertion that many experiments had it confirmed.
 
You're right when you say "suspect to say the least". I wouldn't bother trying to use that site to understand any facts that may actually be contained there.
 
To be blunt, the statement you quoted is rather stupid. Linear accelerators, by definition, accelerate FREE particles. These particles aren't in any bound state. So how could there be ANY "orbitals" or "orbiters" (whatever those are). Without such a thing, how could linear accelerators confirm or disprove whether such a thing radiate at ANY value?

In other words, the site put several things that simply do NOT make any sense together into a sentence.

Zz.
 
Thanks a lot guys. So I can again trust the standard textbooks, which as far as I know never put restrictions at any speed on radiation from an accelerating charge.
"Innumerable linear accelerator experiments confirm” what a claim to make!

While I’m on the subject of suspect sites have any of you come across the work of Dr. Paul Marmet?
 
Still it is interesting to step a little about the classical relativistic speed of a circular orbiter in a coulomb potential. It happens that the product of angular momentum times speed is equal to the coupling constant, Lv=K. Thus a fascinating phenomena happens: as the maximum speed is c, it implies that the minimum angular momentum is K/c. This minimum is reached for radious->0.

Now if the coupling is K=hc/137 and the angular momentum is the smallest quantum one, h, then the speed of the circular orbit is K/h=c/137, and greater angular momenta have smaller speeds. This is the source of the statement in the webpage, and it comes from old good Bohr quantum mechanics.

[In fact I do not know how to define precisely the speed of a circular orbiting (s state?) particle in modern quantum mechanics. It is possible to define the period of the orbit, and is is possible to calculate the average radious, so one could just divide, but it is a very ad-hoc method; one could have different definitions of the period, and different ways to choose radiouses.]

The combination of the quantum minimum, h, and the relativistic minimum, K/c, is the first hint to claim that there could be no exist point-like nuclei with Z > 137, as then K/c>h and a state of angular momentum h can not exist (with r>0); I suppose that electrons are then trapped in the nuclei and then Z becomes less than 137 again :smile:
 
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But this has absolutely nothing to do with a "linear accelerator"!

Zz.
 
ZapperZ said:
To be blunt, the statement you quoted is rather stupid. Linear accelerators, by definition, accelerate FREE particles. These particles aren't in any bound state. So how could there be ANY "orbitals" or "orbiters" (whatever those are). Without such a thing, how could linear accelerators confirm or disprove whether such a thing radiate at ANY value?

In other words, the site put several things that simply do NOT make any sense together into a sentence.

Zz.

From: http://fr.physics.sunysb.edu/francium_news/production.htm

The Stony Brook group creates Fr atoms with atomic weight 210, (half-life of 3.2 minutes) by bombarding a gold target with beams of oxygen from the linear accelerator in the basement of the physics building at Stony Brook.
 
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  • #10
From: http://www.anl.gov/Media_Center/News/History/news960626.html

Plans are now being developed to use ATLAS as the base for an "Advanced Exotic Beam Facility" capable of accelerating beams of unstable, short-lived ions.
 
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  • #11
arivero said:
it comes from old good Bohr quantum mechanics.

Arivero, your answer reminded me of a thread in PF some months ago about ionisation energies. I stated something like that the ionisation energy of the first electron of an atom can be worked out using good old Bohr, taking in account relativistic mass. However the calculated values are always a bit too high. Do you or anyone know why?
 
  • #12
pallidin said:
From: http://fr.physics.sunysb.edu/francium_news/production.htm

The Stony Brook group creates Fr atoms with atomic weight 210, (half-life of 3.2 minutes) by bombarding a gold target with beams of oxygen from the linear accelerator in the basement of the physics building at Stony Brook.

Note: An ACCELERATOR is NOT a COLLIDER!

When you say something is an accelerator, it doesn't mean you are doing high energy particle collider experiment! I work at an accelerator. I study the beam physics and acceleration mechanism. I do ZERO particle collision other than the beam dump at the end of the beamline. Synchrotron centers all over the world also have an accelerator to get electrons up to speed before they are dumped into the storage ring - no study of collisions there either!

Zz.
 
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