[BOINC] [物理类] LHC@Home

vmzy

12.10.2007 09:30 BST
LHC@home moved to the UK a few months ago, and despite a few initial teething problems, the scientists are very happy with the service being provided by us and by you. There will be more work coming from SixTrack in the near future and until the LHC starts up sometime in 2008. Indeed, even after it turns on there will be a demand to keep modeling its behavior and comparing with reality.

We have also been in talks with two different groups involved in the LHC experiments about porting their work to BOINC so it can be run under the LHC@home banner. One you may have heard about is Garfield which has been in the pipeline for a while but is now very close to running on LHC@home (the more eagle-eyed volunteers will have seen it is installed and on the Applications page). The other is simulating particle collisions for the ATLAS experiment, one of the four major LHC experiments. This is a good deal more ambitious, and will probably take a while before it is released to volunteers, but we are getting a lot of interest from the CPU-hungry physicists at ATLAS for this.

All of these factors combined mean that we have decided to officially launch LHC@home in the UK today in a press release. We hope that this brings in some new volunteers and that you welcome them to the community. I know there are some issues to be addressed on the server and Alex and I are working hard on this, but we are happy that the most important aspect of the project is working, namely that jobs are getting processed and the scientists are getting their science done. Thanks to many of you for helping us learn how to manage a volunteer computing experiment, and looking forward to fun times ahead!

Thanks for sticking around,
Neasan.

大意：
从今天起项目正式开工。任务会源源不断的。

我们正在和Garfield与ATLAS小组人员商讨，把他们的任务放到LHC@Home 上的相关事宜。（ATLAS的任务计算量很大）

vmzy

16.10.2007 10:00 BSTWelcome to all our new volunteers. The official launch of LHC@home in the UK was accompanied by a press release which can be seen here. So far we've made, online at least, GridToday and New Scientist. We'll keep you up to date (or you can tell us) on where the story pops up. We hope everyone is happily munching through the workunits, we will be increasing some of the quotas soon so you can crunch some more.
Thanks,
Neasan & Alex.
大意：
项目正式开工。近期将会提高每日任务配额。

tRNA

难怪，我这堆了3个包等待运算了，目前在算一个SETI的

vmzy

29.10.2007 11:40 BST
As you can see lots of work units to be crunched. The quotas have also been raised so you will be able to get some more everyday for the next while. We know it can be a bit frustrating for some users not getting 500 WUs a day but we want as many people as possible to get some work. The restrictions will be slowly lifted as we get more and more work and we hope we can guarantee a constant flow in the future and remove all restrictions.
Thanks,
Neasan & Alex..
大意：
又发任务了，每日配额已经提高了。慢慢的随着任务的增多我们会逐渐提高配额，直至取消该限制。现在任务数量方面没有什么问题。

vmzy

09.01.2008 11:00 GMT
Happy New Year.
We have been quiet recently but rest assured things have been going on behind the scenes here in the UK to keep work units flowing. As some of you will have seen there has been a semi-steady drip of data from the scientists over the last month and you have been busy crunching them. This is not the deluge we thought it'd be but hopefully it is keeping your machines happy.
We're now back from the Christmas break and looking forward to a successful 2008, happy crunchers and a whole load more work units.
Thanks,
Neasan & Alex.
大意：
圣诞大假结束，恢复正常工作，任务还是会继续慢慢的发放的。等待08年正式开工。

vmzy

25.02.2008 11:00 GMT
Hi all,
Hope you've been happy crunching away at the most recent sets of work units. As I type this there are still 15,000 with you so keeping on crunching. This stream of work is of course tied into the impending startup of the LHC itself which is on course to begin later this year. This work is vital in the smooth running of the LHC as a whole reducing the amount of dummy runs and letting the scientists get down to actually doing the real science. While we can't guarantee that we'll still be getting this number (and length) of work units in the coming weeks and months it does seem likely.
We are still looking into getting some new applications up and running on the project and hope to have some real news on this in the next month or so. The problem is it dependent on many different factors which are a little out of our hands but keep your fingers (and anything else you like) crossed.

Thanks folks,
Neasan & Alex.

大意：

按计划年底LHC将正式开工，现在的计算任务都与此密切相关。现在还有比较多的任务，但以后怎么样我也不敢保证。

我们还在为项目写新的计算内核，如果一切顺利的话下个月会有具体消息。

20080030成电

03.03.2008 09:55
        The workunits were coming thick and fast last week. We think that this should continue and we thank you for all your help and patience.

There were some issues with the server but we caught them pretty quickly and think we've fixed them. Hopefully they won't happen again.

After a post ages ago on the forum about myminicity, I thought it'd be fun to have an LHC@home one. So go to http://lhchome.myminicity.com/ and help us build up our minicity.

Wow we're flying now, only thing now is we've no industry so click
http://lhchome.myminicity.com/ind   if you haven't visited our fair city today.

Later days
Neasan.
大意：
上周的任务很多，以后也会保持这种良好的态势。
服务器出了点问题，不过我们很快解决了，希望以后不会再发生类似的问题了。
建了个LHC的myminicity，有兴趣的去看下吧！

[ 本帖最后由 vmzy 于 2008-3-4 13:37 编辑 ]

20080030成电

Hi,
Sorry about the sudden and lengthy suspension of the website. As you may have noticed work units were still coming and going so operation of the project was still ongoing. The reason for the suspension was CERN asked (read: told) us to remove some 'inappropriate content' which was spam within profiles of users. This was a bigger issue than originally thought and we've been searchin through profiles and purging the database when we've had time to do so. We are really sorry but this had popped up in the midst of a whole mess of other things (I've actually been away for most of it) and wasn't done very quickly.
Again thank you all for your patience and I got all your emails and we know it was CERN's open day etc etc.
Later days,
Neasan.

google翻译大意：
前段时间的停机是为了删除一些不当的内容。

Mr.Cancel

什么时候才能不抢包啊

Youth

Hello
I'm finaly upgrading the boinc server software. So please bear with us if there are some interruptions to the service and some funny issues over the next few days.
Thanks,
Alex

大家好，我们终于把服务端的boinc软件给升级了，如果接下来几天有怪问题发生，请多容忍一下：）

Youth

Hello
The server software has now mostly been upgraded. There may still be some issues so please bear with us over the next few days.
Thanks,
Alex

服务端软件的升级已经接近完成了，接下来几天可能还会有问题，请继续体谅一下：）

Mr.Cancel

请问Youth，LHC的项目方还在做服务端的升级工作是否代表着LHC并未彻底结束，还会继续运行和发包呢？

Youth

是啊，本来项目就没有结束，以后lhc正式运行了，应该会有新的任务包：）

duligavin

发表于 2008-7-6 23:10  
LHC又开始发WU了

EQUN队伍已接到计算任务
http://www.equn.com/forum/thread-18802-1-1.html

Cern lab goes 'colder than space'
http://news.bbc.co.uk/1/hi/sci/tech/7512586.stm

Issue No. 28-29/2008 - Monday 07 July 2008
The last piece of the ring
In a sequel to the recent success at CMS, the last section of the LHC beam vacuum system was installed in ATLAS on Monday 16 June. The place where experiment and accelerator meet, the completion of the last part of the continuous 27 km beampipe signals how near the LHC is to the circulation of its first beam.
http://lhc.web.cern.ch/lhc/News.htm

Monthly Tracker Meeting: July 7-9
http://indico.cern.ch/conferenceDisplay.py?confId=37108


9.7.08 Over 1 million cosmic ray events taken last night!
http://cmsdoc.cern.ch/Tracker/Tracker2005/

July 2008
14         export to personal scheduler         Simulations Working Group Technical Meeting  
http://indico.cern.ch/categoryDisplay.py?categId=1433

Youth

The last batch of work was actually a slightly new set of calculations and done by a new member of the CERN group which contributes to LHC@home. We asked him for a description of his work and here it is.

最近的一批新计算任务是由几位CERN的新成员发布的，详细情况如下：

One of the key parameters for a circular accelerator is the so-called dynamic aperture. It represents the region in phase space where stable motion occurs so that a charged particle moving in this region will remain confined in it for a very large number of turns.

Whenever interactions between charged particles are neglected, the size of such a domain is determined by magnetic field imperfections. These imperfections are unavoidable for superconducting magnets, which are the vast majority of the CERN Large Hadron Collider elements. Nevertheless, these disturbances should be kept under control to ensure the required machine performance.

In the design phase, intense tracking campaigns were performed to assess the acceptable level of magnetic imperfection and hence specify the magnetic field quality. At that time, the field quality of the various magnet classes was defined in terms of statistical distributions of the expected magnetic errors. With the completion of the magnet allocation phase, the analysis of the 'as-built' machine could start.

Thanks to the huge amount of information gathered with the magnetic measurements performed before installing the magnets in the tunnel, it is possible to define an accurate model of the machine and hence to infer its expected performance, at least in terms of dynamic aperture. Therefore, new intense efforts are being devoted to massive numerical simulations aimed at computing the dynamic aperture of the actual machine rather than a statistical realization of it.

不翻译了，有兴趣的自己看看吧：）

Massimo Giovannozzi

We should have some more information from the scientists and hopefully more studies to crunch very soon.

我们还会有来自科学家们的更多信息发布，也希望很快就会有更多的计算任务：）

Later days,
Neasan