Search found 67 matches

by pcatom
Thu Jul 07, 2016 12:32 pm
Forum: The Accelerator
Topic: 2016 operation
Replies: 52
Views: 4094

Re: 2016 operation

:naughty: Beware of wild extrapolations!
by pcatom
Thu Jun 11, 2015 8:46 pm
Forum: New Users Start Here
Topic: Hello from Canada
Replies: 3
Views: 906

Re: Hello from Canada

Good day! I've been following the LHC experiments for a few years. I've been patiently waiting for the higher energy collision experiments to begin, and highly anticipate their results. I wish I could be part of this in some way. Becoming a physicist wasn't even in the vocabulary of my school when ...
by pcatom
Tue Apr 28, 2015 6:58 pm
Forum: The Accelerator
Topic: What is AGK
Replies: 3
Views: 1139

Re: What is AGK

Hardwired in the sense that it cannot easily be changed - we are, after all talking about a timing synchronization system at the ns level. It is an integral part of the injection and dump system and is mostly implemented in analog electronics
by pcatom
Mon Apr 27, 2015 7:27 pm
Forum: The Accelerator
Topic: What is AGK
Replies: 3
Views: 1139

Re: What is AGK

You answered it yourself: AGK = Abort Gap Keeper. Is is a hardwired part of the beam dump system to ensure that beam is not injected into the abort gap. The abort gap is a region in time where there is a gap in the beam to allow the beam dump kickers to rise to their full field in order to extract t...
by pcatom
Sun Apr 26, 2015 7:41 pm
Forum: The Accelerator
Topic: What is a BSRI?
Replies: 2
Views: 882

Re: What is a BSRI?

It stands for Beam Synchrotron Radiation Interferometry. Is is a test set-up to extract the beam size from the BSRT light without some of the inherent errors in the normal system.
by pcatom
Mon Apr 06, 2015 5:22 pm
Forum: The Accelerator
Topic: 2014 machine commissioning and 2015 start up
Replies: 59
Views: 52316

Re: 2014 machine commissioning and 2015 start up

That's very gracious of you, considering how busy you are (and all you guys and gals working on bring-up are heroes by the way!). So here's one: what guarantees that the orbital tune set-up at 0.45 TeV will work at higher energies? It won't - not perfectly anyway. We use feed farward - ie go up the...
by pcatom
Mon Apr 06, 2015 3:24 pm
Forum: The Accelerator
Topic: 2014 machine commissioning and 2015 start up
Replies: 59
Views: 52316

Re: 2014 machine commissioning and 2015 start up

That's the problem - I had no idea that 8 weeks was a minimum ! I would love to be able to come along for the ride and watch this great beast rise up again, but I have no real insight into what's being done nor what to expect. This despite having a physics degree! I suspect many would enjoy coming ...
by pcatom
Sun Apr 05, 2015 7:04 pm
Forum: The Accelerator
Topic: 2014 machine commissioning and 2015 start up
Replies: 59
Views: 52316

Re: 2014 machine commissioning and 2015 start up

But the good news is that these 8 weeks are going to be very exciting! In a way, they're more interesting than the production runs. I love it see how they manage to learn from every measurement (and every mistake) they make. One example is how they handled the earth fault in sector 23: it must have...
by pcatom
Sun Apr 05, 2015 4:41 pm
Forum: The Accelerator
Topic: 2014 machine commissioning and 2015 start up
Replies: 59
Views: 52316

Re: 2014 machine commissioning and 2015 start up

After today's excitement, I'm disappointed that we have to wait 8 weeks more to see collisions at 13 TeV. This conservative schedule seems to be largely about safety concerns. Have you any idea what is involved in re-commissioning the LHC for operation? 8 weeks is optimistic if everything goes to p...
by pcatom
Tue Mar 31, 2015 6:09 pm
Forum: The Accelerator
Topic: 2014 machine commissioning and 2015 start up
Replies: 59
Views: 52316

Re: 2014 machine commissioning and 2015 start up

andrewp wrote:Indeed they did succeed. Beam to follow!
Yes ... see

http://home.web.cern.ch/about/updates/2 ... back-track
by pcatom
Fri Mar 20, 2015 8:54 pm
Forum: The Accelerator
Topic: 2014 machine commissioning and 2015 start up
Replies: 59
Views: 52316

Re: 2014 machine commissioning and 2015 start up

It is not a question of quality. All the magnets are of very high quality! However, some of them seem to be a bit forgetful when it comes to their training ... we have to send them to refresher courses. During the cold-testing at the time of LHC construction the Firm3 magnets tended to have a first ...
by pcatom
Thu Feb 27, 2014 9:15 pm
Forum: Science
Topic: FCC
Replies: 10
Views: 2016

Re: FCC

Cosmic rays tend to interact with atoms in the upper atmosphere. These primary interactions are not directly seen on the earths surface. Instead it is the secondary showers of particles from the primary collision that eventually appear in the detectors. The advantage of accelerator based collisions ...
by pcatom
Fri Feb 21, 2014 7:48 pm
Forum: The Accelerator
Topic: Son of LHC
Replies: 1
Views: 1059

Re: Son of LHC

It is a little more complex than that ... but not much. :mrgreen: We study both lepton and hadron versions. The lepton version is dominated by synchrotron radiation considerations and therefore RF accelerating voltage. The hadron version is dominated by our ability to bend the beams and therefore ma...
by pcatom
Fri Feb 14, 2014 9:27 pm
Forum: Science
Topic: FCC
Replies: 10
Views: 2016

Re: FCC

Have a look at the presentations ... and follow over the next 5 years as we elaborate the concept.

It is exciting !!!
by pcatom
Thu Feb 13, 2014 7:18 pm
Forum: Science
Topic: FCC
Replies: 10
Views: 2016

Re: FCC

Having said that ... it won't be a piece of cake either! A lot of technologies will need to be pushed to make it realistic and affordable.