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#Mon Aug 09 11:52:47 CEST 2010
Slide__2LVocKObEd-WfYQ0GneCwQ_subTitle=The entity "light quantum", for which to understand Einstein exerts himself all his life - of no avail, according to his own testimony - (and which is subject to change as the concept of "photon", reflecting the endeavour for physical understanding) leads multiple dual lifes\: wave-particle, photon-quark, photon-lepton, photon-hadron, ... (?). <p></p> <p>Leptons are light material particles, like the electron; hadrons are heavier ones, like the proton.</p> <p>The quark, lepton or even hadron character of the photon becomes manifest in its transformation into a massive particle and its anti-particle (pair production). This is a top theme of particle physics which is, also with a view on such kind questions, in want for highly precise installations - aside of accelerators that rush forwards into ever new energy domains, like the ring-shaped "Large Hadron Collider" (LHC) at CERN in Geneva. In an international co-operation, a linear accelerator TESLA for leptons is being developed to this end. The supraconducting accelerating cavity (figure) of the TESLA project becomes an essential element, too, of a novel, highly energetic laser in the X-ray range, X-FEL.</p>
Slide__2LVocKObEd-WfYQ0GneCwQ_footer=<p>Source\: Deutsches Elektronen-Synchrotron DESY</p>
Slide__2LVocKObEd-WfYQ0GneCwQ_title=From Particle Accelerator to Light Source<p></p>