LHC portal

A new 9 bunch filling scheme with 6 collsions per turn next for physics

@Hokie_Engineer, you are right. Intensity is the number of particles in the beam. Increasing intensity leads to higher luminosity which means more collisions and you need a lot of those to see new physics. There are other ways to increase luminosity, such as squeezing the bunches down to make a narr...

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.

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 longe...

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

5th go now

The 4th attempt with 7x7 bunches is now underway

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.

They started with even higher bunch intensities this time, 120 billion ppb, luminosities therefore a little higher.
The coordination vista indicates a planned jump to 6x6 bunches on Thursday.
The sudden losses might be a bit of a concern though.

:dance: STABLE BEAMS lasted 14 hours. This must have provided at least 10 inverse-nanobarns in one run! The total integrated luminosity up to this point was about 20 inverse nano-barns. This run justifies the break from physics runs to get high intensity bunches working. Hopefully there will be anot...

Record luminosities again, 5 x 10^29 Hz/cm^2

Havn't seen that for a while!
Hope its high intensity bunches and not a fallback to previous physics setup.

Actually CMSSW is a software framework for the Compact Muon Solenoid

From the plan... Goals: 1- complete the longitudinal emittance blow up commissioning - DONE 2- continue the transverse damper commissioning - DONE 3- robust ramp for 1e10 - DONE 4- commission the squeeze with separated beams , squeeze to 3.5 m - DONE 5- OFB, BPM, reference orbit - DONE 6- Collimator...

More details of the current plan can be found in this talk on short to medium term planning where medium term means 10 years!: https://indico.desy.de/contributionDisplay.py?contribId=8&sessionId=15&confId=1964 There have been no physics runs for about three weeks now. If they can achieve smooth runn...