Re: Current Events Discussion
Posted: Mon May 24, 2010 8:05 am
winding it up a little bit at a time...only way to fly!
I believe they are doing it intentionally - they can measure properties of each bunch over time and compare how different collision/passing modes affect them. Non-colliding bunches act as "control".PhilG wrote:What is the purpose of the non-colliding bunches and why did they not use a better sheme without displaced collisions?
Can any guru out there explain why that is? Surely it would be much easier if LHCb was not so displaced and a set of bunches could collide in all the experiments. So presumably there was a reason why it had to be like that, no?The collision point for LHCb is displaced with respect to the other experiments. Providing collisions in LHCb therefore means displaced collisions in the other experiments.
I guess it's because the tunnel system was largely recycled from the LEP accelerator, some modifications were made to the experiment areas but probably moving or creating a new area was deemed too expensive.Tim Bergel wrote:pcatom wrote:Can any guru out there explain why that is? Surely it would be much easier if LHCb was not so displaced and a set of bunches could collide in all the experiments. So presumably there was a reason why it had to be like that, no?The collision point for LHCb is displaced with respect to the other experiments. Providing collisions in LHCb therefore means displaced collisions in the other experiments.
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Alice Atlas LHCb
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