Timeline for How are subatomic particles affected by gravity?
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 21, 2020 at 10:42 | comment | added | anna v | @Peter-ReinstateMonica it is probably a collective effect, that said, I have not gone through their calculations. Each bunch contained some 250 billion particles. physicsmasterclasses.org/exercises/keyhole/it/accelerators/… | |
| Aug 21, 2020 at 10:34 | comment | added | anna v | @Peter-ReinstateMonica it is a composite effect they are studying, trying to improve the knowledge of the energy of the beam , they call them "tide-induced local gravity changes." | |
| Aug 21, 2020 at 7:35 | comment | added | Peter - Reinstate Monica | The direct deflection due to gravity, let alone gravity differentials (aka tides), is much smaller than that: The particles move close to light speed, covering the circumference of 26.7km in less than 0.1ms. If I didn't screw up on the back of my envelope, 0.1ms of free fall in Earth's gravity should translate to a 5E-8m deviation. The tides move the Earth's surface by 0.25m. | |
| Aug 21, 2020 at 7:24 | comment | added | Peter - Reinstate Monica | Very interesting, but it appears that the corrections are necessary not because of gravity affecting the beam trajectory but because the Earth deforms under the tidal forces of the Moon and the Sun: "[The tidal forces] move the Earth surface up and down by as much as -0.25 m which represents a relative local change of the Earth radius of 0.04 ppm. This motion has also lateral components resulting in a change of the LEP circumference...". The position of the quadrupoles changes and thus the geometry of the LEP "optics" is altered, leading to beam deflections. | |
| Aug 21, 2020 at 6:28 | history | edited | anna v | CC BY-SA 4.0 |
clarification
|
| Aug 20, 2020 at 19:46 | history | answered | anna v | CC BY-SA 4.0 |