OLDER 2/15/10 ** current events and discussion **

The place to discuss the LHC. Commissioning, operation, issues, events ....
Stephen
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Re: ** current events and discussion **

Post by Stephen » Wed Dec 09, 2009 6:45 am

Wow, at this rate they'll reach the full 14 TeV in less than a year.

gluon
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Re: ** current events and discussion **

Post by gluon » Wed Dec 09, 2009 12:08 pm

Stephen wrote:Wow, at this rate they'll reach the full 14 TeV in less than a year.
These guys lose no time. ;)

Anyway I believe after setting a new world record at 2.36 TeV they will now focus on ramping up the intensity rather than the energy.

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DCWhitworth
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Re: ** current events and discussion **

Post by DCWhitworth » Wed Dec 09, 2009 1:41 pm

gluon wrote:
Stephen wrote:Wow, at this rate they'll reach the full 14 TeV in less than a year.
These guys lose no time. ;)

Anyway I believe after setting a new world record at 2.36 TeV they will now focus on ramping up the intensity rather than the energy.
That would certainly make sense. They need higher intensity to produce meaningful numbers of collisions.
DC

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gluon
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Re: ** current events and discussion **

Post by gluon » Wed Dec 09, 2009 1:58 pm

They're currently only using 4 bunches per beam. I believe 2,808 bunches is their target.

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Xymox
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Re: ** current events and discussion **

Post by Xymox » Fri Dec 11, 2009 9:28 am

There have been lots of collisions you can watch live at LHCb IF the beams are running...

Check in chat...

But if so,,

Use this to watch collisions live
http://libris.nornagon.net/jca/lhc.htm

gluon
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Re: ** current events and discussion **

Post by gluon » Sat Dec 12, 2009 11:57 am

To my surprise today I woke up with ongoing stable collisions at a beam intensity of approximately 4e+10. The fill is now completing 4 hours and I've been glued to the LHCb experiment live display.

Let me share with you some of the most interesting snapshots I took throughout the morning:
Attachments
collision1.jpg
collision1.jpg (43.43 KiB) Viewed 3912 times
collision2.jpg
collision2.jpg (49.54 KiB) Viewed 3912 times
collision3.jpg
collision3.jpg (39.97 KiB) Viewed 3912 times

gluon
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Re: ** current events and discussion **

Post by gluon » Sat Dec 12, 2009 12:00 pm

Oh and just as the beams were dumped I got this last one with funny vertical tracks:
Attachments
collision4.jpg
collision4.jpg (36.37 KiB) Viewed 3911 times

Anitusar
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Re: ** current events and discussion **

Post by Anitusar » Sat Dec 12, 2009 12:10 pm

gluon wrote:Oh and just as the beams were dumped I got this last one with funny vertical tracks:
I think this is a splash that illuminated the whole outer tracker detector. I do not know if the online reconstruction is then able to find tracks (probably not)

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Xymox
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Re: ** current events and discussion **

Post by Xymox » Sat Dec 12, 2009 6:37 pm

Fot saturday. Note high intensity beams

_______________

-1.17 TeV BEFORE stable beam: need to make a programmed dump of each beam with the 'physics' filling pattern. If time permits we should also make the asynch dump test at 1.17 TeV, in case of changes in the orbit and optics (if these are both very similar to 450 GeV then this is maybe not needed).

-Injection matching studies, 2-4 h. Lower priority, but if some time spare would like to take some data on injection matching and emittance blowup, to at least start using the techniques we'll have to have working next year.

-Intermediate energy dumps (2 points between 450 and 1.2 TeV)

-Ramp test

-Orbit correction at end of ramp!

-MPS and beam dumping system at 1.1 TeV (end of ramp?)

-Protection devices and collimation system setup at 1.1 TeV (end of ramp?)

Miscilleneous work:
-Finish up Polarity checks
-Finish up Kick response measurements
-orbit feedback commissioning
-nQPS quench threshold test with beam (< 2e9)

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Xymox
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Re: ** current events and discussion **

Post by Xymox » Sat Dec 12, 2009 6:39 pm

Of course collisions can occur anytime there are beams.

Stephen
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Re: ** current events and discussion **

Post by Stephen » Sat Dec 12, 2009 6:45 pm

Are they still continuing with their normal schedule or are they trying to find out the source of the technical difficulties first?

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Xymox
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Re: ** current events and discussion **

Post by Xymox » Sun Dec 13, 2009 10:29 am

12 dec, 10:55

When beams are back - ramp tests !

Later 16x16 collisions !

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islandofmind
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Re: ** current events and discussion **

Post by islandofmind » Sun Dec 13, 2009 4:18 pm

I haven't been able to find a definition for the new SMP Flag: Channel Link Status A-B B-A can someone point me to it?

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DCWhitworth
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Re: ** current events and discussion **

Post by DCWhitworth » Sun Dec 13, 2009 4:36 pm

islandofmind wrote:I haven't been able to find a definition for the new SMP Flag: Channel Link Status A-B B-A can someone point me to it?
viewtopic.php?f=4&t=215
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March_Hare
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Re: ** current events and discussion **

Post by March_Hare » Mon Dec 14, 2009 7:54 pm

Not sure if it's been done before but I am looking right now at what seems to be 16x16 with intensity ramped up through 1e+11 (currently at ~1.4e+11) on both beams, at 450 GeV. Highest Intensity I have ever seen, in any case.
(20:53 CET).

Edit: yup, they did it. final intensity was about 1.8e+11 on both beams according to Page 1.
Last edited by March_Hare on Mon Dec 14, 2009 8:10 pm, edited 3 times in total.
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