Re: LHC Portal Google Group Digest for lhc-portal@googlegroups.com - 11 Messages in 4 Topics

[Don Denesiuk]

Chris and The LHC Portal got a big shoutout on Twitter from the LHCexperiment http://twitter.com/LHCExperiment/statuses/6369265643

And The CMSexperiment http://twitter.com/CMSexperiment/statuses/6368696208  under an hour ago. Very cool.

2009/12/4 <lhc-p...@googlegroups.com>

  Today's Topic Summary

Group: http://groups.google.com/group/lhc-portal/topics

• *** MORE THEN ONE BUNCH *** [2 Updates]
• OoOOooo 8e9 [1 Update]
• Ops vistars not auto updating? Atlas has funny horizontal aperture. [7 Updates]
• What sort of noise does the worlds largest machine make? [1 Update]

 Topic: *** MORE THEN ONE BUNCH ***

Chris <C...@Xymox1.com> Dec 04 01:31PM -0700

 
The LHC has had a milestone... More then one bunch of protons in the beam at once. Eventually the LHC will be PACKED with 2800 bunches. Going from just one bunch to handling more then one is a important step and caused celebration in the control room according to someone who was there.
 
They are going to try for more bunches as we go over the next hours / days..
 
Collisions will be with more then one bunch this time..
 
Stay tuned !!!!


 

Danny252 <nuclear...@gmail.com> Dec 04 01:54PM -0800

 
The Collision Alert announcement on the forums contains more details
on upcoming collisions - planned for 1700 Sat, 0000 Sun and 1400 Sun.
 


 

 Topic: OoOOooo 8e9

Chris <C...@Xymox1.com> Dec 04 12:44PM -0700

 
They reached 8e9 !
 
Looks like they are going to higher powers !
 
I feel a record collision coming coming shortly :)


 

 Topic: Ops vistars not auto updating? Atlas has funny horizontal aperture.

"Anders Mølbjerg Lund" <ander...@gmail.com> Dec 03 05:32PM -0800

 
I don't think mine have ever auto updated. Which elog did you get the
summary from?
 
Cheers Anders
 


 

Harbles <harb...@gmail.com> Dec 03 08:54PM -0800

 
Hi,
I recall my OP vistars updating at about 20 sec intervals.
 
If you go to http://lhc-commissioning.web.cern.ch/lhc-commissioning/news/LHC-news.htm
Then click on instructions next to elog and follow but you need a
password. This is where to apply http://it-div.web.cern.ch/it-div/comp-usage/default.asp
They seem quite open but it may take a day for it to work.
It may be improper to repeat info from across a pw ie; log entries.
What do you think?
 
@harbles
 


 

Harbles <harb...@gmail.com> Dec 03 09:00PM -0800

 
Oops I may mean this link for pw https://cernaccount.web.cern.ch/cernaccount/RegisterAccount.aspx
 
 


 

Chris <C...@Xymox1.com> Dec 04 12:03AM -0700

 
yea for sure its not updating anymore :(
 
I will ask the guy who designed it...
 
Harbles wrote:
 
Oops I may mean this link for pw https://cernaccount.web.cern.ch/cernaccount/RegisterAccount.aspx
 
On Dec 3, 8:32 pm, Anders Mølbjerg Lund <andersml...@gmail.com> wrote:
 
I don't think mine have ever auto updated. Which elog did you get the
 
summary from?
 
Cheers Anders
 
On 4 Dec., 00:42, Harbles <harble...@gmail.com> wrote:
 
Not anymore 4 me anyways. Cern saving b/w? CMSTV has a 20 sec
 
alternating display of LHC1 and LHC_Operations screens.http://cmsdoc.cern.ch/cmscc/cmstv/cmstv.jsp?channel=1&frames=no
 
also from the Elog
 
" Summary of the aperture scan in the IRs (preliminary from the onine
 
comparisons):
 
- CMS aperture scan is OK.
 
- ALICE aperture scan is OK.
 
- In ATLAS the V plane is OK (respectively similar to the other
 
experiments). The H plane is 'different' from all other IRs. ATLAS
 
dumped with the BCM on both beams, while the machine BLMs never gave
 
any significant signal (in the V plane the BLMs gave the usual
 
signals). We repeated the scan for both beam1 and beam2 with the same
 
results. We seemed not to be able to reach a sufficient aperture to
 
see a signal on our BLMs. One should note that we nevertheless went to
 
raletively large amplitudes, even tough less than in other IRs. But
 
since the apertures are everywhere different, one has to be carefully
 
not to draw hasty conclusions.  "
 
Interesting.


 

"Anders Mølbjerg Lund" <ander...@gmail.com> Dec 04 09:41AM -0800

 
Thank you very much. I thought that the elog was off limit for non-
staff, so i am very much looking forward to gain access.
 
Cheers Anders
 


 

Harbles <harb...@gmail.com> Dec 04 09:43AM -0800

 
Once you get in the e-log the LHC_OPs section is where I saw the
aforementioned info.
 
 
On Dec 4, 12:41 pm, Anders Mølbjerg Lund <andersml...@gmail.com>
wrote:


 

Chris <C...@Xymox1.com> Dec 04 11:08AM -0700

 
yes I confirmed they fixed it.
 
The Vistars auto update now.
 
David Whitworth wrote:
 
Seems to be updating again now, works for me anyway.
 
2009/12/4 Chris <C...@xymox1.com>:
 
yea for sure its not updating anymore :(
 
I will ask the guy who designed it...
 
Harbles wrote:
 
Oops I may mean this link for pw
 
https://cernaccount.web.cern.ch/cernaccount/RegisterAccount.aspx
 
On Dec 3, 8:32 pm, Anders Mølbjerg Lund <andersml...@gmail.com> wrote:
 
I don't think mine have ever auto updated. Which elog did you get the
 
summary from?
 
Cheers Anders
 
On 4 Dec., 00:42, Harbles <harble...@gmail.com> wrote:
 
Not anymore 4 me anyways. Cern saving b/w? CMSTV has a 20 sec
 
alternating display of LHC1 and LHC_Operations
 
screens.http://cmsdoc.cern.ch/cmscc/cmstv/cmstv.jsp?channel=1&frames=no
 
also from the Elog
 
" Summary of the aperture scan in the IRs (preliminary from the onine
 
comparisons):
 
- CMS aperture scan is OK.
 
- ALICE aperture scan is OK.
 
- In ATLAS the V plane is OK (respectively similar to the other
 
experiments). The H plane is 'different' from all other IRs. ATLAS
 
dumped with the BCM on both beams, while the machine BLMs never gave
 
any significant signal (in the V plane the BLMs gave the usual
 
signals). We repeated the scan for both beam1 and beam2 with the same
 
results. We seemed not to be able to reach a sufficient aperture to
 
see a signal on our BLMs. One should note that we nevertheless went to
 
raletively large amplitudes, even tough less than in other IRs. But
 
since the apertures are everywhere different, one has to be carefully
 
not to draw hasty conclusions.  "
 
Interesting.
 
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 Topic: What sort of noise does the worlds largest machine make?

ethelthefrog <ethelt...@gmail.com> Dec 04 02:10AM -0800

 
Given that the entire machine is held in extreme vacuum (and even
then, the instruments have spotted collisions when there's only been a
single beam in the system which are, most likely, collisions with gas
molecules (no vacuum is perfect)), the collisions themselves won't
make anything a human would recognise as sound. What happens when
these high energy particles smash into the solid parts of the detector
is another matter.
 
The quick answer is "the collisions themselves don't make sound, but I
couldn't begin to speculate about anything else..."


 

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