Editing Synchrotron radiation (section)

==History==

Synchrotron radiation was first observed by technician Floyd Haber, on April 24, 1947, at the 70 MeV electron synchrotron of the [[General Electric]] research laboratory in [[Schenectady, New York]].<ref>{{cite journal |last1=Elder |first1=F. R. |last2=Gurewitsch |first2=A. M. |last3=Langmuir |first3=R. V. |last4=Pollock |first4=H. C. |title=Radiation from Electrons in a Synchrotron |journal= [[Physical Review]] |publisher= [[American Physical Society]] |volume=71 |issue=11 |date=1 June 1947 |issn=0031-899X |doi= 10.1103/physrev.71.829.5 |pages=829–830|bibcode=1947PhRv...71..829E }}</ref> While this was not the first [[synchrotron]] built, it was the first with a transparent vacuum tube, allowing the radiation to be directly observed.<ref>{{cite journal |last1=Mitchell |first1=Edward |last2=Kuhn |first2=Peter |last3=Garman |first3=Elspeth |title=Demystifying the synchrotron trip: a first time user's guide |journal=Structure |date=May 1999 |volume=7 |issue=5 |pages=R111–R121 |doi=10.1016/s0969-2126(99)80063-x |pmid=10378266 |doi-access=free }}</ref>

As recounted by Herbert Pollock:<ref>{{cite journal |last1=Pollock |first1=Herbert C. |title=The discovery of synchrotron radiation |journal=American Journal of Physics |date=March 1983 |volume=51 |issue=3 |pages=278–280 |doi=10.1119/1.13289 |bibcode=1983AmJPh..51..278P |doi-access=free }}</ref>

{{blockquote|On April 24, Langmuir and I were running the machine and as usual were trying to push the electron gun and its associated pulse transformer to the limit. Some intermittent sparking had occurred and we asked the technician to observe with a mirror around the protective concrete wall. He immediately signaled to turn off the synchrotron as "he saw an arc in the tube". The vacuum was still excellent, so Langmuir and I came to the end of the wall and observed. At first we thought it might be due to [[Cherenkov radiation]], but it soon became clearer that we were seeing [[Dmitri Ivanenko|Ivanenko]] and [[Isaak Pomeranchuk|Pomeranchuk]] radiation.<ref>{{cite journal |last1=Iwanenko |first1=D. |last2= Pomeranchuk |first2=I. |title=On the Maximal Energy Attainable in a Betatron |journal= Physical Review |publisher= American Physical Society |volume=65 |issue=11–12 |date=1 June 1944 |issn=0031-899X |doi= 10.1103/physrev.65.343 |page=343|bibcode=1944PhRv...65..343I }}</ref>}}