I am surprised you call linear acceleration synchrotron radiation; I would likely have picked "bremsstrahlung." The polarization (for a swarm of electrons with a power law spectrum) is polarized, but not perhaps "highly polarized" as was derived by Legg, M. P. C., & Westfold, K. C. 1968, ApJ, 154, 499. Pdn 16:36, 14 Jun 2005 (UTC)
"* Brilliance of about ."? in what units?
I need to comment here on the last part of the page. it is said:
Plasma physicist Hannes Alfvén suggested that ions travelling along a Birkeland current into a double layer, may be accelerated to relativistic velocities, which in an inhomengous magnetic field or pinches, accelerate ions to relativistic velocities through magnetic fields, producing synchrotron radiation.
However, there is absolutly no need for inhomogeneous magnetic fields. Charged particles will have, in general, a component of their velocity perpendicular to the local magnetic field, will thus gyrate and emit synchrotron emission. The whole end of this sentence does not make sense. Tusenfem
The two mentions of "GeV-frequencies" should be "GHz-frequencies" surely? [The mention to "GeV-range" energies appears correct.] 203.109.242.80 07:11, 9 May 2006 (UTC)
As noted by the article, synchrotron radiation was first predicted by Hannes Alfvén and Nicolai Herlofson in 1950, and subsequently confirmed by Geoffrey R. Burbidge. The reason behind such a prediction, (indeed any notable prediction), would seem to be not only non-trivial, but consistent with the scientific method. Alfvén's reasoning then, is not just another theory, but the one which enabled him and Herlofson to successfully predict synchrotron radiation.
If "... there are a billion theories on the innumerable production methods of sync rad. in space .." why is one unverified theory left in the text? -- Iantresman 11:26, 28 May 2006 (UTC)
And therefore it has been removed. -- ScienceApologist 21:19, 28 May 2006 (UTC)
The section "Synchrotron radiation from storage rings" reads like a sales brochure, or a research prospectus written by someone who's enthusiastic about applications of synchrotron radiation. The article is about the physical phenomenon in general, however. One could equally well have written this section from the point of view of a particle physicist, for whom synchrotron radiation is a nuisance. There's nothing wrong with talking about applications, but it should be clear that that's what's being talked about, and it shouldn't be incongruously prominent in the article.-- 76.81.164.27 02:53, 10 March 2007 (UTC)
The article lists as characteristics of synchrotron radiation:
Can someone who understands the technical difference between brightness, intensity, and brilliance in this context make an attempt to translate each of these into a short phrase understandable to a layperson, as has been done here for other technical terms (e.g. high collimation, low emittance)? These three words are pretty much synonyms in ordinary daily English and even in many scientific contexts, but they are listed separately here as though they refer to three distinct characteristics. Piperh 20:20, 6 June 2007 (UTC)
Skoch3 ( talk) 06:09, 3 November 2008 (UTC):Shouldn't there be a brief mention of and link to the Bremsstrahlung_radiation article?
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Done, with some name and scope changes as laid out below. Wwheaton ( talk) 16:39, 21 December 2008 (UTC)
Someone added a merge header to the Synchrotron radiation and Synchrotron light articles, but didn't add a comment to the talk page suggesting why. I'll do the honors: "Synchrotron radiation" and "Synchrotron light" are the same thing. The only difference is that the latter could be considered a subset of the former, but the articles as written make (and need) no such distinction. The opening sections try to define the "Synchrotron light" article as being concerned with the applications of synchrotron radiation, while the "Synchrotron radiation" article is concerned with the production of synchrotron radiation, but that's a false bifurcation of a single topic. I strongly advocate merging the two articles. -- Dan Griscom ( talk) 02:26, 12 November 2008 (UTC)
In fact, after looking around a bit more, I have moved the old Synchrotron light to Synchrotron light sources. I hope this is a step in the right direction. Wwheaton ( talk) 20:08, 20 December 2008 (UTC)
I have to stop now, but the article is still a bit of a mess. I hope it is at least a little better. In particular it almost totally lacks any real discussion of the emission physics, spectrum, and polarization, which I think should be the core material after the lead. Most of the section on storage rings needs to be moved to the Synchrotron light source article. I think there should be some mention of curvature radiation in the astrophysics section at least, but will have to go back to my textbooks before I can supply it. Wwheaton ( talk) 02:48, 21 December 2008 (UTC)
Needs to have more information on how synchrotron radiation follows from the Lorentz force law. —Preceding
unsigned comment added by
Michael.r.sabino (
talk •
contribs) 03:05, 17 July 2010 (UTC)
This image http://en.wikipedia.org/wiki/File:Syncrotron_radiation_energy_flux.png seems to be a reproduction from D. H. Tomboulian and P. L. Hartman, Phys. Rev. 102 (1956) 1423. Shouldn't that be cited? 192.44.85.28 ( talk) 12:07, 23 January 2014 (UTC)
I think the physical meaning of the critical frequency as the frequency that divides the emitted power into equal halves (from: http://xdb.lbl.gov/Section2/Sec_2-1.html), should be added. Just giving out the equation without physical meaning is not helpful. سادىق سېتىنىياز ( talk) 01:29, 2 December 2014 (UTC) — Preceding unsigned comment added by Sadik82 ( talk • contribs) 01:22, 2 December 2014 (UTC)
One of the equations has been recently changed by the user Special:Contributions/2001:DA8:D800:740:C19E:3912:33F4:CA84, as follows:
Integration over the whole solid angle yields the total power radiated by one electron
Old version:
New version, with a single added:
I'd like someone knowledgeable to take a look at this equation to see which version is right. In fact, preferably someone should verify all the equations we have in the article -- it seems their accuracy is somewhat dubious. JudgeDeadd ( talk) 11:05, 30 December 2014 (UTC)
The section states that SR "was first detected in a jet emitted by Messier 87 in 1956 by Geoffrey R. Burbidge". The article on Grote Reber notes (without citation) that his observations of significant low-energy radio signals did not support the (then-current) black-body radiation model. The Reber article then reads: "It was not until the 1950s that synchrotron radiation was offered as an explanation for these measurements."
Since Reber was essentially the world's only radio astronomer for a decade, doing much his work in the VHF range (GHz receivers being,erm, a bit crude in the 40s), it's quite possible that the 'detection' came before even Alfven and Herlofson. Alas, I don't have access to the Reber publications, but here's a bibliography of 91 of them (20 before 1950). Some attention to Reber seems appropriate here. Twang ( talk) 07:34, 2 September 2015 (UTC)
This article needs to have a section on the uses and applications of synchrotron radiation. The reader needs to be informed about X-ray crystallography, without which we would not know anything about protein-structures, and photoemission, which is essential for analysis of semiconductors and other technologically-important surfaces. HandsomeMrToad ( talk) 03:49, 27 November 2016 (UTC)
This article is still marked as start-class quality, which I believe is inappropriate given that this article is now longer, has good graphics, and contains relevant physics equations. Would anyone be willing to reevaluate this article for quality? Mooseandbruce1 ( talk) 07:29, 27 February 2017 (UTC)
The connection with Bremsstrahlung has been discussed above and rejected on the grounds that it is of different physical origin. That contradicts the Bremsstrahlung article, which states this is simply a narrower definition of the same physical events. As I understand it, both are caused by the same underlying mechanism, the only difference between the definitions being that one is linear and the other perpendicular. Is there a difference in the underlying physical mechanism, or is the difference essentially source related? Maury Markowitz ( talk) 12:53, 10 October 2017 (UTC)
From the text of the article: "photoelectrons ... propagate secondary electrons from the pipe walls with increasing frequency and density up to 7×10^10." What are the units of the density being specified? Unless I am missing some concept by which density can be a unitless quantity, there should be units specified here. Dratman ( talk) 02:06, 12 February 2019 (UTC)
It all about bremmstralung and other emissions due to relativistic particle-particle collisions, but not about synchrotron radiation, which is due to interaction of particles with macroscopic magnetic field. Although SR emissions of discussed objects exists and very important, they are radio emissions, they not seen on images, and not mentioned in text. Lexey73 ( talk) 10:47, 19 February 2023 (UTC)
I am surprised you call linear acceleration synchrotron radiation; I would likely have picked "bremsstrahlung." The polarization (for a swarm of electrons with a power law spectrum) is polarized, but not perhaps "highly polarized" as was derived by Legg, M. P. C., & Westfold, K. C. 1968, ApJ, 154, 499. Pdn 16:36, 14 Jun 2005 (UTC)
"* Brilliance of about ."? in what units?
I need to comment here on the last part of the page. it is said:
Plasma physicist Hannes Alfvén suggested that ions travelling along a Birkeland current into a double layer, may be accelerated to relativistic velocities, which in an inhomengous magnetic field or pinches, accelerate ions to relativistic velocities through magnetic fields, producing synchrotron radiation.
However, there is absolutly no need for inhomogeneous magnetic fields. Charged particles will have, in general, a component of their velocity perpendicular to the local magnetic field, will thus gyrate and emit synchrotron emission. The whole end of this sentence does not make sense. Tusenfem
The two mentions of "GeV-frequencies" should be "GHz-frequencies" surely? [The mention to "GeV-range" energies appears correct.] 203.109.242.80 07:11, 9 May 2006 (UTC)
As noted by the article, synchrotron radiation was first predicted by Hannes Alfvén and Nicolai Herlofson in 1950, and subsequently confirmed by Geoffrey R. Burbidge. The reason behind such a prediction, (indeed any notable prediction), would seem to be not only non-trivial, but consistent with the scientific method. Alfvén's reasoning then, is not just another theory, but the one which enabled him and Herlofson to successfully predict synchrotron radiation.
If "... there are a billion theories on the innumerable production methods of sync rad. in space .." why is one unverified theory left in the text? -- Iantresman 11:26, 28 May 2006 (UTC)
And therefore it has been removed. -- ScienceApologist 21:19, 28 May 2006 (UTC)
The section "Synchrotron radiation from storage rings" reads like a sales brochure, or a research prospectus written by someone who's enthusiastic about applications of synchrotron radiation. The article is about the physical phenomenon in general, however. One could equally well have written this section from the point of view of a particle physicist, for whom synchrotron radiation is a nuisance. There's nothing wrong with talking about applications, but it should be clear that that's what's being talked about, and it shouldn't be incongruously prominent in the article.-- 76.81.164.27 02:53, 10 March 2007 (UTC)
The article lists as characteristics of synchrotron radiation:
Can someone who understands the technical difference between brightness, intensity, and brilliance in this context make an attempt to translate each of these into a short phrase understandable to a layperson, as has been done here for other technical terms (e.g. high collimation, low emittance)? These three words are pretty much synonyms in ordinary daily English and even in many scientific contexts, but they are listed separately here as though they refer to three distinct characteristics. Piperh 20:20, 6 June 2007 (UTC)
Skoch3 ( talk) 06:09, 3 November 2008 (UTC):Shouldn't there be a brief mention of and link to the Bremsstrahlung_radiation article?
This
level-5 vital article is rated Start-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||
|
Done, with some name and scope changes as laid out below. Wwheaton ( talk) 16:39, 21 December 2008 (UTC)
Someone added a merge header to the Synchrotron radiation and Synchrotron light articles, but didn't add a comment to the talk page suggesting why. I'll do the honors: "Synchrotron radiation" and "Synchrotron light" are the same thing. The only difference is that the latter could be considered a subset of the former, but the articles as written make (and need) no such distinction. The opening sections try to define the "Synchrotron light" article as being concerned with the applications of synchrotron radiation, while the "Synchrotron radiation" article is concerned with the production of synchrotron radiation, but that's a false bifurcation of a single topic. I strongly advocate merging the two articles. -- Dan Griscom ( talk) 02:26, 12 November 2008 (UTC)
In fact, after looking around a bit more, I have moved the old Synchrotron light to Synchrotron light sources. I hope this is a step in the right direction. Wwheaton ( talk) 20:08, 20 December 2008 (UTC)
I have to stop now, but the article is still a bit of a mess. I hope it is at least a little better. In particular it almost totally lacks any real discussion of the emission physics, spectrum, and polarization, which I think should be the core material after the lead. Most of the section on storage rings needs to be moved to the Synchrotron light source article. I think there should be some mention of curvature radiation in the astrophysics section at least, but will have to go back to my textbooks before I can supply it. Wwheaton ( talk) 02:48, 21 December 2008 (UTC)
Needs to have more information on how synchrotron radiation follows from the Lorentz force law. —Preceding
unsigned comment added by
Michael.r.sabino (
talk •
contribs) 03:05, 17 July 2010 (UTC)
This image http://en.wikipedia.org/wiki/File:Syncrotron_radiation_energy_flux.png seems to be a reproduction from D. H. Tomboulian and P. L. Hartman, Phys. Rev. 102 (1956) 1423. Shouldn't that be cited? 192.44.85.28 ( talk) 12:07, 23 January 2014 (UTC)
I think the physical meaning of the critical frequency as the frequency that divides the emitted power into equal halves (from: http://xdb.lbl.gov/Section2/Sec_2-1.html), should be added. Just giving out the equation without physical meaning is not helpful. سادىق سېتىنىياز ( talk) 01:29, 2 December 2014 (UTC) — Preceding unsigned comment added by Sadik82 ( talk • contribs) 01:22, 2 December 2014 (UTC)
One of the equations has been recently changed by the user Special:Contributions/2001:DA8:D800:740:C19E:3912:33F4:CA84, as follows:
Integration over the whole solid angle yields the total power radiated by one electron
Old version:
New version, with a single added:
I'd like someone knowledgeable to take a look at this equation to see which version is right. In fact, preferably someone should verify all the equations we have in the article -- it seems their accuracy is somewhat dubious. JudgeDeadd ( talk) 11:05, 30 December 2014 (UTC)
The section states that SR "was first detected in a jet emitted by Messier 87 in 1956 by Geoffrey R. Burbidge". The article on Grote Reber notes (without citation) that his observations of significant low-energy radio signals did not support the (then-current) black-body radiation model. The Reber article then reads: "It was not until the 1950s that synchrotron radiation was offered as an explanation for these measurements."
Since Reber was essentially the world's only radio astronomer for a decade, doing much his work in the VHF range (GHz receivers being,erm, a bit crude in the 40s), it's quite possible that the 'detection' came before even Alfven and Herlofson. Alas, I don't have access to the Reber publications, but here's a bibliography of 91 of them (20 before 1950). Some attention to Reber seems appropriate here. Twang ( talk) 07:34, 2 September 2015 (UTC)
This article needs to have a section on the uses and applications of synchrotron radiation. The reader needs to be informed about X-ray crystallography, without which we would not know anything about protein-structures, and photoemission, which is essential for analysis of semiconductors and other technologically-important surfaces. HandsomeMrToad ( talk) 03:49, 27 November 2016 (UTC)
This article is still marked as start-class quality, which I believe is inappropriate given that this article is now longer, has good graphics, and contains relevant physics equations. Would anyone be willing to reevaluate this article for quality? Mooseandbruce1 ( talk) 07:29, 27 February 2017 (UTC)
The connection with Bremsstrahlung has been discussed above and rejected on the grounds that it is of different physical origin. That contradicts the Bremsstrahlung article, which states this is simply a narrower definition of the same physical events. As I understand it, both are caused by the same underlying mechanism, the only difference between the definitions being that one is linear and the other perpendicular. Is there a difference in the underlying physical mechanism, or is the difference essentially source related? Maury Markowitz ( talk) 12:53, 10 October 2017 (UTC)
From the text of the article: "photoelectrons ... propagate secondary electrons from the pipe walls with increasing frequency and density up to 7×10^10." What are the units of the density being specified? Unless I am missing some concept by which density can be a unitless quantity, there should be units specified here. Dratman ( talk) 02:06, 12 February 2019 (UTC)
It all about bremmstralung and other emissions due to relativistic particle-particle collisions, but not about synchrotron radiation, which is due to interaction of particles with macroscopic magnetic field. Although SR emissions of discussed objects exists and very important, they are radio emissions, they not seen on images, and not mentioned in text. Lexey73 ( talk) 10:47, 19 February 2023 (UTC)