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李淼的博客

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LHC日志(1)  

2009-11-29 16:25:13|  分类: 默认分类 |  标签: |举报 |字号 订阅

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有人要求我谈谈LHC。LHC刚刚有了head-on collision,能量还很低,亮度还很小,没有什么物理好谈的。当然,碰撞了就说明好戏开场了,值得庆贺。

理论所的同事和国内的同仁有时不一定知道如何在网上找到关于LHC运行的最新消息,所以我决定开个专题,连续报道LHC,但时间不定,也许一个礼拜一次,也许几个礼拜一次,反正为了自己为了大家,我会坚持的。这个是第一个报道。

以下给出的链接我并没有全看,没有那么多时间啊。

我建议大家看看最后贴的那个Steve Myers的interview,这个interview也见证了史上最成功的科学与媒体的互动。

欢迎同仁们将我的博客加入收藏,或用Greader订阅我的博客。

Credits: 所有消息来自 Antonella的tweets。

11月21日,It’s 12:24 in Geneva, operators are checking various parameters in the injection chain and the LHC #CERN #LHC。

Some info about how we make beams for the LHC:protons are produced by stripping electrons from hydrogen atoms.This is easy.Then,2nd step: protons are accelerated in a LINAC=linear accelerator. Their energy starts to increase. And then,3rd step: protons are sent to circular accelerators (PSB and PS): it’s were bunches are prepared. The energy increases. And then,4 step: protons are sent to SPS, the last circle before the LHC.A few turns to increase the energy up to 450GeV. Do you know how much is it? Back to450GeV,the extraction energy from SPS.Crushing a nut easily involves more than 450GeV of your energy.So,where is the trick?

11月21日,the LHC is preparing for injection from the SPS. ALICE experiment records splashes as well!

Nice animation of a beam splash in the LHCb experiment. Look at their page

11月22日,The anticlockwise beam is now in and circulating… working on improving the beam lifetime.

11月23日,Good morning from CERN. Over three days, the LHC has had two beams circulating with good lifetimes. It’s a good solid start.

11月24日,It’s been an eventful day at CERN. It started with two circulating beams and ended with first collisions in four detectors.

CERN’s press release has pictures of some of the first collisions

The LHC accelerated a beam to 540 GeV overnight. Here are the pictures

11月27日,Steve Myers video interview on seven remarkable seven days for CERN

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