Search found 16 matches

by gilgamorph
Tue Mar 17, 2015 10:48 pm
Forum: The Accelerator
Topic: 2014 machine commissioning and 2015 start up
Replies: 59
Views: 62845

Re: 2014 machine commissioning and 2015 start up

I 've seen no reference to the startup progress site: hcc.web.cern.ch/hcc/

much of interest there including links to daily progress reports.


Things were going so well! Is anyone aware of the reasons why sector 4-5 is so uncooperative?
by gilgamorph
Thu Jul 26, 2012 4:39 am
Forum: LHCb
Topic: Blast! Were we blasted?
Replies: 1
Views: 5006

Blast! Were we blasted?

I noticed an alarming spike on the Vistar luminosity screen. LHCb seeing 13000 ub.s^-1 instantaneous luminosity ! (Target luminosity 400 ub.s^-1) After they dumped fill 2875 (15+hr, 172/pb) they switched polarity on LHCb and loaded a light fill for IP optimization. (I have a luminosity page screen g...
by gilgamorph
Tue Jul 24, 2012 12:13 am
Forum: The Accelerator
Topic: COOL links
Replies: 57
Views: 20693

Re: COOL links

DC Whitworth wrote: Don't know if this has been posted before but this is now my favourite physics song - http://www.youtube.com/watch?v=U0kXkWXSXRA Nice song, but this still my favorite: The Large Hadron Rap :banana-linedance: :banana-linedance: :banana-linedance: :banana-angel: :banana-blonde: :b...
by gilgamorph
Mon Jul 16, 2012 2:07 am
Forum: The Accelerator
Topic: How is the quality of the beam being currently improved?
Replies: 2
Views: 1624

Re: How is the quality of the beam being currently improved?

Good catch, I had also noted the reduced bunch intensities. I also noted that a previous fill had an impressively tight range of bunch intensities. They seem to be making strides in the injection process after some earlier problems. I wonder if they lowered the maximum allowed bunch intensity to lim...
by gilgamorph
Sun Jul 15, 2012 10:48 pm
Forum: The Accelerator
Topic: Active Hypercycle acronym angst - 10 Aps ?
Replies: 2
Views: 2367

Active Hypercycle acronym angst - 10 Aps ?

:oops: I'm embarrassed to admit I can't guess what "A"s per second they are referring to by Aps in the hypercycle. Google searches combining Aps with various LHC terms proved fruitless, and searching "LHC Hypercycle" turned up only a Feb 2010 post to the What Do the Displays Mean? topic back when th...
by gilgamorph
Sat Jul 14, 2012 1:15 pm
Forum: The Accelerator
Topic: 5 sigma Higgs !!!
Replies: 32
Views: 82877

Re: 5 sigma Higgs !!!

Cryogenic123 wrote: Thats not correct!. boson is a particle that is with a "B" and not a "b". How else can you explain the nomenclature of "boson"? It was derived from the Bose-Einstein condensate theory. The EU scientific community is deliberately playing a racist role in not mentioning this as a ...
by gilgamorph
Sat Jul 14, 2012 1:15 pm
Forum: The Accelerator
Topic: 5 sigma Higgs !!!
Replies: 32
Views: 82877

Re: 5 sigma Higgs !!!

*edit* - removed duplicate post. sorry.
by gilgamorph
Sat Jul 14, 2012 11:48 am
Forum: The Accelerator
Topic: 2012 Events Discussion
Replies: 100
Views: 78202

Re: 2012 Events Discussion

The main reason for the extension is technical, and not Physics driven
Does this mean there is some reason that they couldn't begin implementing the improvements planned for LS1 until later next year?
by gilgamorph
Sat Jul 14, 2012 10:50 am
Forum: The Accelerator
Topic: 90m physics?
Replies: 3
Views: 3861

Re: 90m physics?

This my layman's take on your questions, and if an expert cares to disabuse me of any notions expressed below, I would appreciate it. I have been curious about Beta* for some time, so your question spurred me to look further. Thanks to Mike DeForster of Cornell I was able to use the math on pp 16-20...
by gilgamorph
Wed Jul 11, 2012 8:42 pm
Forum: The Accelerator
Topic: Why So QUIET ??? Machine Development !!!!!
Replies: 4
Views: 2728

Re: Why So QUIET ??? Machine Development !!!!!

Thanks Chriwi, DC. I appreciate your insights pcatom, an excellent explanation. :clap: 25ns is the distance between 2 adjacent bunches which are delivered from the injectors. It only makes sense in multi-bunch injections. Sorry, I was facetiously riffing on the single bunch pilot probe that they inj...
by gilgamorph
Wed Jul 11, 2012 2:38 am
Forum: The Accelerator
Topic: Why So QUIET ??? Machine Development !!!!!
Replies: 4
Views: 2728

Why So QUIET ??? Machine Development !!!!!

hmm.. lets see... _ _ :angry-screaming: 25 ns. . . . . new settings !! . . . . . . . :scared-shocked: (what does 25ns mean if you are injecting one bunch ? just a doubled RF ?) latest-news @ 12:04 - 288 b stable with high chromaticity whew .... by chromaticity are they refering to spread in kinetic ...
by gilgamorph
Thu Jul 05, 2012 5:38 am
Forum: The Accelerator
Topic: 5 sigma Higgs !!!
Replies: 32
Views: 82877

Re: 5 sigma Higgs !!!

what a wonderful early present 2012 has delivered. :clap: :D :clap: i was struck by the fact that the diphoton channel showed an excess above SM expectations (3/2 sigma?), and it's been pointed out that the relative absence of a tau-tau signal may also portend that this not exactly the SM Higgs. :th...
by gilgamorph
Sat Jun 16, 2012 7:22 pm
Forum: New Users Start Here
Topic: What do the displays mean ?
Replies: 85
Views: 57667

Re: What do the displays mean ?

thanks for the reply. I'm not so sure about the instantaneous x 3600. fill 2736 showed Atlas: 6107.8 instantaneous (x3600=20.2/pb) ...........................22.9 integrated/h --------------------CMS: 5997.7 instantaneous (x3600=21.6/pb) ...........................21.8 integrated/h this was not long...
by gilgamorph
Sat Jun 16, 2012 5:33 am
Forum: New Users Start Here
Topic: What do the displays mean ?
Replies: 85
Views: 57667

Re: What do the displays mean ?

I was curious about the Integrated/h value listed on the LHC dashboard page.

Would this be the (actual) trailing hour, the current luminosity multiplied out to an hour, or (extrapolated) a projection given current decay rates ?
by gilgamorph
Sat Jun 16, 2012 3:42 am
Forum: The Accelerator
Topic: LHC-statistics web page quality control?
Replies: 1
Views: 1493

LHC-statistics web page quality control?

Did anyone notice that The LHC Performance and Statistics page has some problems? :crying-green: I've noticed several times that they were 30+hours behind in posting fills and sometimes had errors in integrated luminosity where a previous fill had been duplicated. This week all of the Fill Start Tim...