Search found 40 matches

by andrewp
Fri Mar 27, 2015 6:55 am
Forum: The Accelerator
Topic: 2014 machine commissioning and 2015 start up
Replies: 59
Views: 58983

Re: 2014 machine commissioning and 2015 start up

In which sector is the short circuit?

It's 3-4
by andrewp
Fri Mar 20, 2015 12:42 am
Forum: The Accelerator
Topic: 2014 machine commissioning and 2015 start up
Replies: 59
Views: 58983

Re: 2014 machine commissioning and 2015 start up

Sector 4-5 sux. Anyone know why?
by andrewp
Mon Mar 31, 2014 11:16 pm
Forum: Science
Topic: FCC
Replies: 18
Views: 3841

Re: FCC

And the call went out to the particle physicists of the world: TO THE BALLOONS!! :dance:
by andrewp
Mon Mar 31, 2014 10:58 pm
Forum: The Accelerator
Topic: Repulsive gravity testing at the LHC?
Replies: 1
Views: 1472

Repulsive gravity testing at the LHC?

There's a great series of papers by Franklin Felber which predicts a repulsive gravity effect measurable in the beam tunnel, but not in a way which interferes with the normal operation of the LHC. http://arxiv.org/abs/0910.1084 The consequences of verifying this prediction, which is based on GR, can...
by andrewp
Tue Feb 18, 2014 11:42 pm
Forum: The Accelerator
Topic: Son of LHC
Replies: 1
Views: 1333

Son of LHC

http://www.bbc.co.uk/news/science-environment-26250716 Wearing my CERN director imaginary hat, here's how I'd attack son of LHC: 1. Decide what it is: electrons, protons + heavy ions, or both. Might be able to do 2 beampipes in one tunnel, or could time multiplex (electrons on Tuesdays) 2. Decide wh...
by andrewp
Sat Sep 08, 2012 9:56 pm
Forum: The Accelerator
Topic: 1.7 x10^11 PPB?
Replies: 6
Views: 2725

Re: 1.7 x10^11 PPB?

Yeah, OK, I guess that's the way it is. The Statistics plot looks reasonably straight line slope, so I guess we'll make or exceed target. Just today there have been about three failures. All credit to the crews though; they seem to jump on them immediately to work and fix the problems. Thanks for th...
by andrewp
Sat Sep 08, 2012 2:11 pm
Forum: The Accelerator
Topic: 1.7 x10^11 PPB?
Replies: 6
Views: 2725

Re: 1.7 x10^11 PPB?

I can see 70% by eye from "LHC Operation" over one day. You say over 90% is hilarious, but if I look at the minimum downtime between runs, it is a fact that 90%, more or less, is achievable. Why do we differ, then? The longest runs we see are around 12 hours, with a typical intensity drop over the d...
by andrewp
Sat Sep 08, 2012 12:45 am
Forum: The Accelerator
Topic: 1.7 x10^11 PPB?
Replies: 6
Views: 2725

Re: 1.7 x10^11 PPB?

I pop in from time to time to see how it's all going, and of late have been a little disappointed with machine utilisation. Admittedly, some days have Physics going up to 70% of the time, but many days are like today with Physics being done less than 50% of the time. I think the theoretical limit is...
by andrewp
Sun Jul 18, 2010 6:27 am
Forum: New Users Start Here
Topic: Hi and hey hey
Replies: 2
Views: 1175

Hi and hey hey

:text-imnewhere: Have been monitoring the LHC regularly since before switch-on. What an awesome achievement of physics and engineering. It has to be the most complex machine ever built to date. A little about me: an M.A. in physics from the UK and then over 40 years as an engineer (hardware, softwar...
by andrewp
Sat Jul 17, 2010 10:13 pm
Forum: The Accelerator
Topic: What about TOTEM?
Replies: 1
Views: 894

What about TOTEM?

I'm always intrigued that when a good run is underway and all status indicators show green and PHYSICS, the TOTEM status is invariably at STANDBY. Maybe they sleep a lot? maybe there's just one grad student on the project? Who knows?