Search found 78 matches

by josch222
Tue May 24, 2011 11:21 am
Forum: Off topic
Topic: A bit of global warming
Replies: 31
Views: 10598

Re: A bit of global warming

... Wall of text ... Insanity has to stop somewhere, I am not arguing with you because your post is too long and I hate answering such amount of questions, especially if most answers you are asking for lie just one click away in the first post of this topic - which you were supposed to listen to an...
by josch222
Mon May 23, 2011 7:38 pm
Forum: Off topic
Topic: A bit of global warming
Replies: 31
Views: 10598

Re: A bit of global warming

I fail to see some kind of "hidden agenda", while on the other side there is a lot of money from the fossil fuel lobby and dubious "scientists" involved. Now that's one really funny argument because I can see it exactly the other way around. Based on what? Please explain how the IPCC is working to ...
by josch222
Tue May 17, 2011 9:52 am
Forum: Off topic
Topic: A bit of global warming
Replies: 31
Views: 10598

Re: A bit of global warming

I'm more on the side of the IPCC on the AGW issue for the following reasons: I fail to see some kind of "hidden agenda", while on the other side there is a lot of money from the fossil fuel lobby and dubious "scientists" involved. The AGW sceptical real climate scientists are in a minority. But I th...
by josch222
Tue Apr 19, 2011 9:36 am
Forum: The Accelerator
Topic: 2011 Events Discussion
Replies: 184
Views: 50550

Re: 2011 Events Discussion

According to the slides from the daily meeting this morning,
they plan "no beam from 16:00 - 19:00+ for VIP visit" tomorrow.

Does anybody know who will visit?

Must be really important, possibly some politician involved in funding.
by josch222
Mon Apr 18, 2011 10:17 am
Forum: The Accelerator
Topic: 2011 Events Discussion
Replies: 184
Views: 50550

Re: 2011 Events Discussion

What I don't understand: They are preparing for injection right now. If there was a flashover at the kicker magnet there should have been some insulation problem before the spark and even more after it. Electrical arcs don't tend to improve insulation. How did they fix this in just a few hours? But ...
by josch222
Mon Apr 18, 2011 7:06 am
Forum: The Accelerator
Topic: 2011 Events Discussion
Replies: 184
Views: 50550

Re: 2011 Events Discussion

There was a flash over at an injection kicker magnet during injection. 36 bunches impacted on injection collimators and absorbers, probably the resulting high radiation triggered the quench heaters in 9 dipoles and 2 quadrupoles and closing of some vacuum valves. 88% of total intensity where dumped,...
by josch222
Fri Nov 19, 2010 1:33 pm
Forum: ALICE
Topic: ALICE paper on lead collisions
Replies: 1
Views: 4710

ALICE paper on lead collisions

Titled:
"Elliptic flow of charged particles in Pb-Pb collisions at 2.76 TeV"
http://arxiv.org/abs/1011.3914

Correction:
There are 2 papers already, some short description:
http://blogs.uslhc.us/first-heavy-ion-papers
by josch222
Fri Nov 19, 2010 1:31 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 106535

Re: Current Events Discussion

A whole lot of bunches!

Yesterday they managed to get 680 bunches in both beams, today they
are up to 800, but only in beam 1.

It looks like the scrubbing really helped to keep a better vacuum.
by josch222
Tue Nov 02, 2010 12:09 pm
Forum: The Accelerator
Topic: Interesting loss pattern "Guess the Cause" :-)
Replies: 1
Views: 1124

Interesting loss pattern "Guess the Cause" :-)

In the slides from today's meeting there is a strange loss pattern shown on slide 3: http://lhc-commissioning.web.cern.ch/lhc-commissioning/news-2010/presentations/week44/2010.11.02-summary%20830.pptx It does not fit with the pattern of a falling dust particle like the "UFO" events. My first idea is...
by josch222
Mon Oct 25, 2010 8:38 am
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 106535

Re: Current Events Discussion

Great, two really good runs in the last 24h! They gathered approx. 8.8/pb so far and plan to dump at 14:00h, by then they will have surely collected 10/pb. So they should get 50/pb till the end of proton physics even if there are a few problems. If they would stay with 368 bunches and simply do fill...
by josch222
Sun Oct 24, 2010 4:10 am
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 106535

Re: Current Events Discussion

Higher beam energy in 2011? At the beginning of the technical stop in December there will be a meeting in Evian. According to the linked document they plan to discuss higher beam energies between 3.5 and 4.5TeV. http://indico.cern.ch/getFile.py/access?contribId=1&resId=0&materialId=slides&confId=110...
by josch222
Fri Oct 22, 2010 9:15 pm
Forum: The Accelerator
Topic: The Hump
Replies: 20
Views: 8784

Re: The Hump

Hi LarryS, is it possible to get access to the OP Log as a normal person? I saw the hump mentioned in the "commissioning latest news" rarely in the past weeks. At least once the hump was mentioned and a second time was about installing additional magnetic probes (or moving the previously installed o...
by josch222
Thu Oct 21, 2010 11:47 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 106535

Re: Current Events Discussion

Slides from a meeting about the recently observed vacuum effects:
http://indico.cern.ch/getFile.py/access ... fId=109986
by josch222
Mon Oct 04, 2010 12:06 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 106535

Re: Current Events Discussion

At lower intensities the shower generated is less intense as well and does not trigger beam dump. They actually scanned log data from past successful runs and found multiple such events which just weren't strong enough to cause a problem. So lets assume that the total rate of beam-dust events is co...
by josch222
Mon Oct 04, 2010 1:05 am
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 106535

Re: Current Events Discussion

Thanks for the references, nice to see that someone in the audience at Myers speech had a similar assumption. Myers explanation sounds very reasonable but I don't understand why they didn't cleaned the beam shields before they assembled them (or burred them before packing), it seems to be a known pr...