LHC portal

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

This sounds big!

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

This sounds big!

Hope it goes well for them

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

From the live schedule:

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



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

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.

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

Good luck guys

The 4th attempt with 7x7 bunches is now underway

5th go now

We shall overcome!!!!!

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

5e90!!!! Keep it going!

From p1:

"hands off for at least 2 hrs!"

Still looking for a sustained run with stable beams though

Sure looks like they did it - 10 hours and counting

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

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.