Current Events Discussion

The place to discuss the LHC. Commissioning, operation, issues, events ....
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jmayes
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Re: Current Events Discussion

Post by jmayes » Fri Jul 02, 2010 12:17 am

From P1:"preparing to inject 7 bunches..., This fill for physics"

This sounds big!

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CharmQuark
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Re: Current Events Discussion

Post by CharmQuark » Fri Jul 02, 2010 12:22 am

jmayes wrote:From P1:"preparing to inject 7 bunches..., This fill for physics"

This sounds big!
Hope it goes well for them :thumbup:
Anyone who doesn't take truth seriously in small matters cannot be trusted with large ones either by Albert Einstein.

tomey36
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Re: Current Events Discussion

Post by tomey36 » Fri Jul 02, 2010 1:21 am

looks like the action is heating up! its has been a long time but i guess all thier hard work paid off!

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Tim Bergel
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Re: Current Events Discussion

Post by Tim Bergel » Fri Jul 02, 2010 9:24 am

From the live schedule:

Fri 08:00 Prepare for 7 on 7 physics
Fri 16:00 Holland v Brazil

:lol:

looks like they had a good few hours at 7 on 7 last night.

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PhilG
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Re: Current Events Discussion

Post by PhilG » Fri Jul 02, 2010 11:29 am

:laughing-rolling: I dont think they got the luminosity they were after, but at least their humor is not dented.
Think they will have another shot at it this afternoon.

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jmayes
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Re: Current Events Discussion

Post by jmayes » Fri Jul 02, 2010 1:51 pm

Back at it with 7x7 at 7e11, I wish them luck!
:dance:

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CharmQuark
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Re: Current Events Discussion

Post by CharmQuark » Fri Jul 02, 2010 4:37 pm

Good luck guys ;)
Anyone who doesn't take truth seriously in small matters cannot be trusted with large ones either by Albert Einstein.

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PhilG
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Re: Current Events Discussion

Post by PhilG » Fri Jul 02, 2010 8:38 pm

The 4th attempt with 7x7 bunches is now underway

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PhilG
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Re: Current Events Discussion

Post by PhilG » Sat Jul 03, 2010 6:55 am

5th go now

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mrgumby
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Re: Current Events Discussion

Post by mrgumby » Sat Jul 03, 2010 8:54 am

We shall overcome!!!!!

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PhilG
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Re: Current Events Discussion

Post by PhilG » Sat Jul 03, 2010 1:17 pm

In fact they did reach record luminosity 1.1E30 cm-2s-1 yesterday evening.
Still looking for a siustained run with stable beams though

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jmayes
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Re: Current Events Discussion

Post by jmayes » Sun Jul 04, 2010 5:34 am

5e90!!!! Keep it going!

From p1:

"hands off for at least 2 hrs!"
:dance: :clap: :dance: :dance: :clap:

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Tim Bergel
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Re: Current Events Discussion

Post by Tim Bergel » Mon Jul 05, 2010 10:33 am

Still looking for a sustained run with stable beams though
Sure looks like they did it - 10 hours and counting

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PhilG
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Re: Current Events Discussion

Post by PhilG » Mon Jul 05, 2010 12:56 pm

Yes, they had a couple of good runs and pushed the integrated luminosity past 70 inverse nano barns. earlier they had a luminosity of over 1e30 cm-2s-1 but they only held it for 16 minutes. They then reduced intensity a little and the later runs were around half that luminosity but lasted much longer.

According to the morning reports all the problems they had on each attempted run were different, so no single big issue is holding them back, just a run of bad luck.

Now they will test multi-bunch injection in between physics runs.

Special report today at http://indico.cern.ch/getFile.py/access ... fId=100171

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PhilG
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Re: Current Events Discussion

Post by PhilG » Mon Jul 05, 2010 7:06 pm

They are going for a 10x10 bunch scheme as mentioned in the special report today.
This scheme will not have more collisions per turn that the 7x7 bunch scheme, but the beam-beam interactions are cleaner. So peak luminosity will not be improved but stability and lifetime might be.

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