Weekend of 12-3-09 collision events !

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Texanguy
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Re: *** COLLISION ALERT ***

Post by Texanguy » Sat Dec 05, 2009 11:51 pm

DCWhitworth wrote:Beam one dumped according to Status Op.
yeah, i noticed its intensity drop like a sack of bricks on the BRAN count rate chart..

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Re: *** COLLISION ALERT ***

Post by LHC_Insider » Sat Dec 05, 2009 11:54 pm

Xymox wrote:Different subject... From the CMS Page "gather the experts in preparation for the first physics fills of the LHC."

I think its approaching time...
Indeedy. We're all awaiting it - which is why I'm up waiting for data to look at, and not tucked up in bed.
Xymox wrote:betcha its gonna be 4x4
Betcha it's not...

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DCWhitworth
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Re: *** COLLISION ALERT ***

Post by DCWhitworth » Sat Dec 05, 2009 11:55 pm

Texanguy wrote:
DCWhitworth wrote:Beam one dumped according to Status Op.
yeah, i noticed its intensity drop like a sack of bricks on the BRAN count rate chart..
Yet page 1 still shows beam on at 1.22e+10 :?
DC

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Texanguy
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Re: *** COLLISION ALERT ***

Post by Texanguy » Sat Dec 05, 2009 11:56 pm

DCWhitworth wrote:
Texanguy wrote:
DCWhitworth wrote:Beam one dumped according to Status Op.
yeah, i noticed its intensity drop like a sack of bricks on the BRAN count rate chart..
Yet page 1 still shows beam on at 1.22e+10 :?
weird, eh? ._. or am i just missing something?

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Texanguy
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Re: *** COLLISION ALERT ***

Post by Texanguy » Sat Dec 05, 2009 11:59 pm

Page 1: Global Beam Permit=Except? what does that mean? ._.

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Re: *** COLLISION ALERT ***

Post by Lexa » Sun Dec 06, 2009 12:00 am

http://lhc-commissioning.web.cern.ch/lh ... C-news.htm

don't you think this "Ramp" in the schedule is quite interesting? :)

Ramp until now was used to reach higher energy (1.18 TeV for instance ^^).

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DCWhitworth
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Re: *** COLLISION ALERT ***

Post by DCWhitworth » Sun Dec 06, 2009 12:02 am

Texanguy wrote:
DCWhitworth wrote:
Texanguy wrote: yeah, i noticed its intensity drop like a sack of bricks on the BRAN count rate chart..
Yet page 1 still shows beam on at 1.22e+10 :?
weird, eh? ._. or am i just missing something?
I think I trust the Status Op page more on this. I've seen it cut out before if data is lost but not drop so I'm guessing the drop is accurate.
DC

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Re: *** COLLISION ALERT ***

Post by Lexa » Sun Dec 06, 2009 12:04 am

From LHCb log book :
Beam 1 with 4 bunches was kept for 45 minutes and then dumped. LHC page 1 is stuck again (LHC is working on
fixing it).
This makes it clear now.

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DCWhitworth
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Re: *** COLLISION ALERT ***

Post by DCWhitworth » Sun Dec 06, 2009 12:05 am

Texanguy wrote:Page 1: Global Beam Permit=Except? what does that mean? ._.
I think it's an error in the display system (as opposed to an error in the LHC workings)
DC

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Re: *** COLLISION ALERT ***

Post by DCWhitworth » Sun Dec 06, 2009 12:07 am

Beam 2 circulating. More people paying attention at ATLAS now. . . .
DC

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Re: *** COLLISION ALERT ***

Post by Xymox » Sun Dec 06, 2009 12:09 am

Guy holding a camera at ATLAS

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DCWhitworth
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Re: *** COLLISION ALERT ***

Post by DCWhitworth » Sun Dec 06, 2009 12:10 am

DCWhitworth wrote:Beam 2 circulating. More people paying attention at ATLAS now. . . .
Definitely more attention. Man has appeared with video camera to film the moment . . .
DC

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Texanguy
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Re: *** COLLISION ALERT ***

Post by Texanguy » Sun Dec 06, 2009 12:11 am

beam 2 intensity went up off the charts for a bit... heh

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Re: *** COLLISION ALERT ***

Post by Xymox » Sun Dec 06, 2009 12:12 am

Yes it did and then dropped

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Re: *** COLLISION ALERT ***

Post by Xymox » Sun Dec 06, 2009 12:14 am

OoOOO new video angle !!!

Go ATLAS

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