Current Events Discussion

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tswsl1989
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Re: Current Events Discussion

Post by tswsl1989 » Sun Jan 02, 2011 12:10 pm

To quote from http://lhc-commissioning.web.cern.ch/lhc-commissioning/:
Plan to restart with beam on 21st February 2011 after the Christmas technical stop. It will take around 3 - 4 weeks to restablish collisions for the experiments. This will be followed by a phased intensity increase. The target for 2011 is around 900 nominal intensity bunches.
Looking here: https://espace.cern.ch/be-dep/BEDepartm ... e_v1.0.pdf it looks like 2011 will have the same format as 2010 - proton physics until November, then Ion physics until the winter shutdown

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LarryS
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Re: Current Events Discussion

Post by LarryS » Mon Jan 24, 2011 5:43 pm

It is said that a few "green sprouts" can indicate that Spring is drawing near ...

See: "Portal / LHC / Cryo Status"

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DCWhitworth
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Re: Current Events Discussion

Post by DCWhitworth » Mon Jan 24, 2011 7:38 pm

LarryS wrote:It is said that a few "green sprouts" can indicate that Spring is drawing near ...

See: "Portal / LHC / Cryo Status"
I count eight green sprouts ! :mrgreen:
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DCWhitworth
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Re: Current Events Discussion

Post by DCWhitworth » Tue Jan 25, 2011 9:19 am

DCWhitworth wrote:
LarryS wrote:It is said that a few "green sprouts" can indicate that Spring is drawing near ...

See: "Portal / LHC / Cryo Status"
I count eight green sprouts ! :mrgreen:
Sixteen today :D
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tomey36
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Re: Current Events Discussion

Post by tomey36 » Thu Feb 03, 2011 4:35 am

Any one know if they are running at 50ns or 75ns, i couldnt find any mention of that.

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Re: Current Events Discussion

Post by morgad » Thu Feb 03, 2011 11:06 pm


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DCWhitworth
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Re: Current Events Discussion

Post by DCWhitworth » Fri Feb 04, 2011 10:42 am

The plan is I think to get the LHC running at maximum intensity fairly soon. At the Chamonix conference they were saying they could get triple the number of bunches and double the squeeze that they managed in 2010. So I guess they will be pushing in this direction ASAP to increase the amount of data they get, which was a key factor in the decision to run in 2012.
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Harbles
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Re: Current Events Discussion

Post by Harbles » Sat Feb 19, 2011 9:32 pm

They're baak! LHC circulates first beam of 2011! Congrats! http://twitter.com/#!/lhcstatus/status/ ... 3358078976

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Re: Current Events Discussion

Post by conrad » Sat Feb 26, 2011 1:13 pm

On 2/25 LHC news said: ramp and squeeze ( squeeze to 1.5 m in one go)
Is this a major improvement over last year?

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Re: Current Events Discussion

Post by pcatom » Sat Feb 26, 2011 2:16 pm

It is about a factor of 2 faster than last year when the squeeze was to 3.5m. In addition it goes in one go - last year there was a couple of stops during the squeeze to check things and move the collimators.

The complete squeeze now takes 476 seconds.

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ikarus177
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Re: Current Events Discussion

Post by ikarus177 » Sat Feb 26, 2011 2:20 pm

In last year's run they stopped at beta* = 3,5m.
In 2009 (with lower intensity and energy) they squeezed to 2m.
Beams (with even more bunches as last year) squeezed to beta* = 1,5m should give us a considerabely higher luminosity.

On Friday on 23:33 they wrote that they scrape the beam with the primary collimaters in order to get more "microphone data". Are they recording the sound of the beam being scraped down?

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Re: Current Events Discussion

Post by pcatom » Sat Feb 26, 2011 2:24 pm

There are microphones attached to some of the collimators.

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ikarus177
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Re: Current Events Discussion

Post by ikarus177 » Sat Feb 26, 2011 2:30 pm

What is this data used for (measuring some beam parameters)?

pcatom
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Re: Current Events Discussion

Post by pcatom » Sat Feb 26, 2011 2:39 pm

Probably to make a new LHC sc-RAP-e ;)

There isn't a specific use for the mike data - its more for interest. If the beam did hit the collimator full on you would hear a noise like a gunshot .

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DCWhitworth
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Re: Current Events Discussion

Post by DCWhitworth » Sat Feb 26, 2011 3:52 pm

pcatom wrote:Probably to make a new LHC sc-RAP-e ;)

There isn't a specific use for the mike data - its more for interest. If the beam did hit the collimator full on you would hear a noise like a gunshot .
Sound effects here - http://lhc-collimation-project.web.cern ... movies.htm

:D
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