Search found 156 matches

by Tau
Mon Jun 18, 2018 5:28 am
Forum: The Accelerator
Topic: Start of major civil engineering work for the HL-LHC
Replies: 1
Views: 297

Re: Start of major civil engineering work for the HL-LHC

Quite cool stuff they're doing there.
I am especially impressed by the record breaking 100 kA transmission lines.
That's some serious current not to be messed with.
by Tau
Tue Jun 05, 2018 8:37 am
Forum: Portal link and forum suggestions
Topic: Suggestion for main topic: HL-LHC
Replies: 0
Views: 395

Suggestion for main topic: HL-LHC

Hi, Although there are not many people on this forum talking about this, it may be worth adding a new main topic for the HL-LHC. (See https://home.cern/topics/high-luminosity-lhc .) Now the first steps are being taken, there is a lot of stuff going on there. This would give room to discuss for examp...
by Tau
Tue Jun 05, 2018 6:51 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 66
Views: 4918

Re: 2018 Operation

Aha, so that causes unexpected dumps!
Looks a lot more plausible than birds dropping sandwiches in ventilation ducts https://cds.cern.ch/journal/CERNBulleti ... es/1221806 or a hump https://vixra.wordpress.com/2010/07/16/ ... erference/.
by Tau
Tue Jun 05, 2018 6:46 am
Forum: The Accelerator
Topic: The accelerator complex from the viewpoint of a proton
Replies: 0
Views: 100

The accelerator complex from the viewpoint of a proton

Just a thought... If you are a proton flying through the accelerator complex, you see the world around you malformed by Lorentz contraction. This gives some interesting relativistic weirdness. Also, the time perception of the proton changes. (The computations below are based on the fact that a proto...
by Tau
Sun Jun 03, 2018 2:57 pm
Forum: New Users Start Here
Topic: Hey all
Replies: 4
Views: 496

Re: Hey all

Welcome to the club. You are welcome, even though current it is a bit silent (too silent, to my liking).
It is always good to have some insiders to get the juicy details :-)
by Tau
Mon May 28, 2018 10:33 am
Forum: Portal link and forum suggestions
Topic: Default stylesheet
Replies: 2
Views: 158

Re: Default stylesheet

Agreed. I remember what I felt when I first met this forum: "It this the dark web?"
by Tau
Mon May 28, 2018 10:27 am
Forum: The Accelerator
Topic: Squeeze during ramp
Replies: 2
Views: 194

Re: Squeeze during ramp

Oops! I must have forgotten, as I recall watching them closely in 2015.
Thanks for the links.
Anyway, thanks for reminding me. I am feeling very old now; maybe I am losing my memory...
by Tau
Wed May 23, 2018 8:41 pm
Forum: The Accelerator
Topic: LHC Monitoring and Introduction
Replies: 2
Views: 1422

Re: LHC Monitoring and Introduction

Thanks for the site, maalpu.
I tried to contact you via that forum, but I couldn't get in since I don't know the answer to the obscure question.
Anyway, what I wanted to add: XRP = Roman Pots (the TOTEM devices).
by Tau
Wed May 23, 2018 12:57 pm
Forum: The Accelerator
Topic: Squeeze during ramp
Replies: 2
Views: 194

Squeeze during ramp

Hi all,
I admit it, I have been off the forum for too long.
But if I watched carefully today, I saw some squeezing during the ramp. That is so cool.
To bad we can't access the morning meetings anymore; I am anxious to see how they managed to do that!
by Tau
Wed May 23, 2018 12:46 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 66
Views: 4918

Re: 2018 Operation

Here you can see that they are at about twice the predicted performance... not bad. (That was at the time I posted this, which was May. The updated graph will of course change, and I can't predict what it looks like when you read this.) https://twiki.cern.ch/twiki/pub/LhcMachine/LhcCoordinationMain/...
by Tau
Fri Jul 01, 2016 7:21 am
Forum: The Accelerator
Topic: Interesting dump cause today
Replies: 1
Views: 738

Interesting dump cause today

After a sequence of unplanned beam dump that were unsurprisingly all caused by disturbances on the power grid, there was an interesting dump this morning, which was caused by the internal dump trigger. Short explanation: To make sure the beam energy is disposed of safely, there is a dump system. The...
by Tau
Thu Jun 30, 2016 11:13 am
Forum: The Accelerator
Topic: 30,000 AMPS, WOW!
Replies: 11
Views: 3387

Re: 30,000 AMPS, WOW!

A-hahahah really wow !!!.. Well inductance is might hard to deal with. Resistance is easy... 15 Henries is insane A quick calculation: energy in coil = 1/2 * inductance * current^2 so at 30 kA and 15 H we have 6750 MJ. The coil will have that much energy at its avail to make sure the current keeps ...
by Tau
Tue Jun 28, 2016 9:13 am
Forum: The Accelerator
Topic: What are the current records for LHC fills?
Replies: 45
Views: 6715

Re: What are the current records for LHC fills?

sciing wrote:All records in one fill, longest fill after 37h operator dump. Finally 737/pb for ATLAS and 710/pb for CMS.
And then, in four hours and three minutes, we are back in business! That's not the record, but in combination with the fill length we have over 90% stable beams.
Not bad at all...
by Tau
Sun Jun 26, 2016 6:56 am
Forum: New Users Start Here
Topic: Hi!
Replies: 2
Views: 1012

Re: Hi!

chardo137 wrote:Hi all!
Don't be intimidated by the math/physics gurus. They will answer anything you ask.
Really!
by Tau
Sun Jun 26, 2016 6:04 am
Forum: The Accelerator
Topic: What are the current records for LHC fills?
Replies: 45
Views: 6715

Re: What are the current records for LHC fills?

And, after some "interesting" troubles last week, we are getting another record fill: 5043. As I write this, we already have .55/fb. Reading tip, not for the faint of heart: if you are not afraid of some though math, this article shows exactly what are the troubles of the ADJUST phase (I never under...