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Measured speed of the particle beam?
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Send message Joined: 26 Aug 05 Posts: 68 Credit: 545,660 RAC: 0 |
Has there ben made any measurement of the speed on the particle beam in accelerators and if so, how is it done? |
Send message Joined: 29 Sep 04 Posts: 42 Credit: 11,505,632 RAC: 0 |
Has there ben made any measurement of the speed on the particle beam in accelerators and if so, how is it done? the speed is c=3*10^8 m/s (speed of light)!! |
Send message Joined: 26 Aug 05 Posts: 68 Credit: 545,660 RAC: 0 |
Has there ben made any measurement of the speed on the particle beam in accelerators and if so, how is it done? 1. On a particle with a rest mas > zero? 2. How was the measurement made? |
Send message Joined: 29 Sep 04 Posts: 42 Credit: 11,505,632 RAC: 0 |
OK, my answer was quite sensational. You are right that particle with mass will not reach the speed of light, but they come very close 95% up to 99,999...%. Todays accelerators like the LHC or SPS, Tevatron, RHIC, SLAC, KEK, ... are all power full enough. How to measure, well thats easy. You measure the time t the particle takes to travel the distance s and you calculate the speed v = s/t. You should use a very precise stopwatch (TDC with time resolution down to some 100ps). |
Send message Joined: 26 Aug 05 Posts: 68 Credit: 545,660 RAC: 0 |
OK, my answer was quite sensational. You are right that particle with mass will not reach the speed of light, but they come very close 95% up to 99,999...%. Ok. let's assume that you measure the speed by determine the time it takes for a particle to travel from A to B. What method do they use to verify when the particle is at location A and location B and how do they actually do it. |
Send message Joined: 29 Sep 04 Posts: 42 Credit: 11,505,632 RAC: 0 |
There are charged particles in the accelerators (mainly electrons and protons). And these charged particles induce a signal when they flight cross a capacitance like system. This system is named schottky pick up (if i am right), so you measure the revolution frequency and one know the circumference of the synchrotron, so one can calculate the speed. There are also other possibilities: Taking some detectors like scintillators. But that disturbs the beam. |
Send message Joined: 26 Aug 05 Posts: 68 Credit: 545,660 RAC: 0 |
Thank you CoM. |
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