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  • $\begingroup$ In addition to technical difficulties (Would that be mostly beam cooling? I am a beam user, not a beam maker...), linear machines suffer from the simple cost implications of only getting one pass through each klystron. $\endgroup$ Commented May 13, 2014 at 15:50
  • $\begingroup$ @dmckee the cooling is done in dedicated damping rings before injecting in the linac. The difficulties are mostly in alignment. Wikipedia has a good page explaining how the Compact LInear Collider solves the single-pass-through-each-klystron problem. $\endgroup$ Commented May 13, 2014 at 16:05
  • $\begingroup$ Cute. I believe that regeneration technique was first used on a large scale at the JLAB FEL which I have seen a number of talks on. $\endgroup$ Commented May 13, 2014 at 16:08
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    $\begingroup$ @James There would be no particular difficulty in developing a machine for $e^-e^-$ collisions. They are just not very interesting due to the conservation of the lepton number. A possible application is the $\gamma\gamma$ collider, where one could start with two primary $e^-$ beams, ditching the $e^+$ beam which is a bit trickier to produce, especially at high intensities. $\endgroup$ Commented Sep 20 at 10:23
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    $\begingroup$ @James, yes but as lepton number must be preserved, the probability of producing interesting particles is way lower. $\endgroup$ Commented Sep 27 at 12:55