# LHC particle combinations and colliding neutral particles

In high-energy particle accelerators, we have limited possibilities for what kinds of particles we can collide due to their charge, radiation properties etc. I understand that in LHC we collide high-mass particles such as protons or lead nuclei because they are electrically charged so we can use electromagnetic methods. They are massive as well so their radiation output is not that large as well.

Is there a possibility to attach some emitter of different particles like electrons or neutrons to some of the detectors "from the side" to have new kinds of collisions on high-energy? (True that it would be still only 6.5 TeV collision and not full 13 because emitter would not have its own accelerator, nevertheless we could then have the possibility of neutron-proton collisions and many others.)

Is it technically difficult or even tested to collide particles perpendiculary to the synchrotron beam?

Is or why wasn't this scheme used in the construction of LHC?

But the result is that a fixed target experiment using one beam from a collider is not half as energetic as a the collider experiment; it is a lot less energetic because much of the energy is thrown away in the form of the resultant spray having a large overall momentum in the lab frame. In other words, don't be thinking $6.5\,\mathrm{TeV}$ here.
• Just to put a number to what you say about fixed-target collisions, the value of $\sqrt{s}$ for a 7 TeV proton colliding with a stationary proton is about 115 GeV – dukwon Sep 27 '16 at 13:35