Timeline for Why does CERN use magnets instead of capacitor grids like an electron gun?
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 14, 2020 at 19:14 | comment | added | aquagremlin | are you saying there will be an arc between them? I read that unlike air, vacuum does not breakdown until theoretically it breaks only within the Quantum Field Theory because of the so called Schwinger effect Schwinger effect - Wikipedia i.e electron-positron creation from the energy density of the field under 10^12 MV/m = 1000000000000 MV/m. Realistically though no vacuum is perfect tho this link says the voltage would be very high physics.stackexchange.com/questions/335618/… | |
| May 14, 2020 at 17:50 | comment | added | Solomon Slow | Re, "...why a device like that in a crt cannot be used in series." A CRT has a voltage, typically tens of thousands of volts, between its cathode and its anode. What happens when you put voltages in series? | |
| May 14, 2020 at 16:34 | comment | added | aquagremlin | Thank you for the reference. It is mostly about rf accelerators. Yes i know i said magnets in the title when i should have been more specific and said oscillating magnetic field. But i still don’t get why a device like that in a crt cannot be used in series. From this reference. en.wikipedia.org/wiki/Linear_particle_accelerator It seems that electric fields can be used which is basically the thing that accelerates electrons in a crt. | |
| May 14, 2020 at 15:39 | comment | added | Jon Custer | And, klystrons aren't magnets. | |
| May 14, 2020 at 15:26 | comment | added | Jon Custer | Same for electron linacs, by the way. The ability to 'continuously' accelerate particles was the real advantage of linacs/cyclotrons/etc. over Cockroft-Walton or Van de Graaff electrostatic accelerators. | |
| May 14, 2020 at 15:25 | comment | added | Jon Custer | Nope, it just doesn't work that way - see, for example, cds.cern.ch/record/1982425/files/295-329%20Vretenar.pdf | |
| May 14, 2020 at 15:22 | comment | added | aquagremlin | Imagine the source of protons connected to a tunnel that opens up into a ring which has a bunch of the ‘parallel plate capacitors’ spaced evenly around. It is described here physics.stackexchange.com/questions/12788/…. The protons should behave the same way electrons do - accelerating more and more each time they pass through another grid, no? | |
| May 14, 2020 at 15:18 | comment | added | Jon Custer | Because you need to keep accelerating the particles as they go round and round - so electrostatics isn't the way to do it. Essentially the LHC is a linac wrapped around on itself. | |
| May 14, 2020 at 15:16 | history | asked | aquagremlin | CC BY-SA 4.0 |