Search found 135 matches

by PhilG
Sat May 15, 2010 7:57 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 190365

Re: Current Events Discussion

I think one advantage of the current filling pattern is that it does not produce any displaced collisions where the bunches would meet near an experiment and not at exactly the right collision point. The filling patterns that give more collisions tend to have displaced collisions too and maybe those...
by PhilG
Sat May 15, 2010 7:45 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 190365

Re: Current Events Discussion

It's always possible that something new could be discovered at low luminosity because the energy is higher than previous accelerators. More likely they need to get the luminosity above the levels at the Tevatron which is currently running with 6000 times more luminosity than the latest runs at the L...
by PhilG
Sat May 15, 2010 7:21 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 190365

Re: Current Events Discussion

Luminosity now is about twice previous record
by PhilG
Sat May 15, 2010 1:03 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 190365

Re: Current Events Discussion

Six bunches (plus pilot), should give a 50% luminosity increase on previous physics run.

If they could do this with nominal bunch intensity it would be about another 25 times as much, but that's for later.
by PhilG
Sat May 15, 2010 8:54 am
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 190365

Re: Current Events Discussion

They have just succeeded in ramping "nominal bunches" to 3.5 TeV. This means bunches with 100 billion protons which is 5 times the number used per bunch in the latest physics runs. This is exciting because luminosity is increased by the square of this number. In fact if they used nominal bunches on ...
by PhilG
Fri May 14, 2010 12:04 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 190365

Re: Current Events Discussion

The choice of buckets means that there will be no more collisions per turn than the previous 3 bunch configuration. However, the higher intensity per bunch could increase luminoisity by something like 2 to 3 times over previous runs. 6 bunch runs are planned for the next few days along with other te...
by PhilG
Wed May 05, 2010 4:28 pm
Forum: Science
Topic: Where does the energy go?
Replies: 13
Views: 9213

Re: Where does the energy go?

Photino, Hi! The kind of stuff you are saying is exactly what many cosmologists and relativity experts say. I have looked at these things very hard and my conclusion is that they are nonsense. No offense intended to anyone but these things need to be put straight! Let's look at some of the things yo...
by PhilG
Tue May 04, 2010 9:59 pm
Forum: Science
Topic: Where does the energy go?
Replies: 13
Views: 9213

Re: Where does the energy go?

There are a lot of well known cosmologists and relativity experts who like to say things such as "energy conservation is only local in GR" or "energy conservation is only non-local in GR" or "energy conservation only works in special cases such as static spacetimes or asymptotically flat spacetimes"...
by PhilG
Tue May 04, 2010 9:38 pm
Forum: Science
Topic: Where does the energy go?
Replies: 13
Views: 9213

Re: Where does the energy go?

Expansion of the universe is more than just galaxies moving apart. It is a feature of the metric of spacetime itself. The metric is also the gravitational field. So saying that photon redshift is due to expansion of universe implies that it is also an interaction with the gravitational field. This i...
by PhilG
Tue May 04, 2010 12:03 pm
Forum: Science
Topic: Where does the energy go?
Replies: 13
Views: 9213

Re: Where does the energy go?

It's not so strange if you think about it. The photons are losing energy because they are interacting with the gravitational field. Every action has a reaction so the gravitational field must be changed too. All fields in physics contain energy and the gravitational field is no exception, so the los...
by PhilG
Mon May 03, 2010 10:19 pm
Forum: Science
Topic: Where does the energy go?
Replies: 13
Views: 9213

Re: Where does the energy go?

The lost energy goes into the gravitational field
by PhilG
Sat Apr 24, 2010 8:30 am
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 190365

Re: Current Events Discussion

They have to use these odd looking bunch numbers because of the awkward positioning of LHCb. The bucket numbers now being used will give 2 collisions per circuit of the beams for each experiment, compared with 1 collision before. see http://blog.vixra.org/2010/04/24/lhc-achieves-stable-squeezed-beam...
by PhilG
Wed Mar 03, 2010 8:30 am
Forum: The Accelerator
Topic: Older Events and discussion 3/22/10
Replies: 156
Views: 58284

Re: ** Current Events and discussion **

Plan Wednesday 03/03/2010 : Until 9:00 : beta beating 09:00 -10:00 : Orbit study with 2 beams 10:00 –12:00 : Dump and Pre cycle –BLM intervention IR6 –RBAC activation 12:00 -15:00 : Re-establish beams and checks of parameters 15:00 -21:00 : Systematic hump investigation 21:00 –02:00 : Injection stud...
by PhilG
Mon Feb 08, 2010 5:01 pm
Forum: The Accelerator
Topic: 2010 Startup
Replies: 89
Views: 28487

Re: 2010 Startup

It would be just like them to start up early
by PhilG
Sun Dec 06, 2009 10:09 pm
Forum: The Accelerator
Topic: Weekend of 12-3-09 collision events !
Replies: 188
Views: 58395

Re: *** COLLISION ALERT ***

I cant be the first to notice this but CMS reported a dijet event. http://cms.web.cern.ch/cms/News/e-comme ... tary09.htm

Also ATLAS are seeing events now http://atlas.web.cern.ch/Atlas/public/E ... vents.html