Search found 97 matches

by LarryS
Wed Apr 14, 2010 1:37 pm
Forum: New Users Start Here
Topic: What do the displays mean ?
Replies: 85
Views: 49834

Re: What do the displays mean ?

Have a question on the "CERN BE - OP" eLog display:

I see: "Preparing IP8 squeeze where I know "IP8" is Injection Point 8

Followed by: "IP8 down to 8 m." OR "Started step to 5 m. in IP8"

Question is: What is "m"?
by LarryS
Tue Apr 06, 2010 3:40 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 61020

Re: Current Events Discussion

Thanks ... that makes sense
by LarryS
Tue Apr 06, 2010 1:39 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 61020

Re: Current Events Discussion

Beam was lost due to an Undulator Trip from the QPS (Quench Protection System)

Does anyone know what an "Undulator" is ? ...
by LarryS
Sat Apr 03, 2010 8:50 pm
Forum: The Accelerator
Topic: Current Events Discussion
Replies: 512
Views: 61020

Re: Current Events Discussion

Not sure if this will fully answer your question but from the "CERN BE - OP eLogbook" Unprogrammed dump. When completing collimator sequence. TCT and TCLs were out of tollerance. I have been (very slowly) putting together a spread-sheet of all the acronyms used on the various screens; I have the fol...
by LarryS
Thu Apr 01, 2010 11:40 am
Forum: The Accelerator
Topic: Collisions are occuring now
Replies: 29
Views: 4388

Re: Collisions are occuring now

On the latest slides (Portal, LHC, Progress, CMS, Page 9) it is mentioned that they would like to move to a "3 bunch fill" and keep energy at the 3.5 TeV. This should improve the collision rates.
by LarryS
Wed Mar 31, 2010 10:07 pm
Forum: The Accelerator
Topic: Collisions are occuring now
Replies: 29
Views: 4388

Re: Collisions are occuring now

But now that I looked closer at your post ... these 2 bunches were injected separately.
by LarryS
Wed Mar 31, 2010 10:05 pm
Forum: The Accelerator
Topic: Collisions are occuring now
Replies: 29
Views: 4388

Re: Collisions are occuring now

The current run has 2 bunches per beam as did yesterdays run.
by LarryS
Wed Mar 31, 2010 12:23 pm
Forum: The Accelerator
Topic: Collisions are occuring now
Replies: 29
Views: 4388

Re: Collisions are occuring now

Just when things were looking as if we might see some collisions we get ... Both beams dumped: For some reason the tune feedback system for Beam 1 switched back on after it was turned off. A chromaticity measurement started (presuming the feedback was off) dumped the beam. Thus we are back to square...
by LarryS
Tue Mar 30, 2010 4:42 pm
Forum: The Accelerator
Topic: Collisions are occuring now
Replies: 29
Views: 4388

Re: Collisions are occuring now

Indeed, 3 good hours and when this access is completed we should see several more hours of good physics today.
by LarryS
Tue Mar 30, 2010 3:31 pm
Forum: The Accelerator
Topic: Collisions are occuring now
Replies: 29
Views: 4388

Re: Collisions are occuring now

Log file shows the following:

Beam dumped because of tracking error of Principal circuit of generator MKD K beam 2.
Recorded a positive tracking error of 0.5 %
by LarryS
Tue Mar 30, 2010 2:56 pm
Forum: The Accelerator
Topic: Collisions are occuring now
Replies: 29
Views: 4388

Re: Collisions are occuring now

Beams dumped at 16:31 due to an LBDS interlock; LBDS is LHC Beam Dump System so I suspect that this was not planned. They are investigating
by LarryS
Tue Mar 23, 2010 7:01 pm
Forum: The Accelerator
Topic: Rock stable beams
Replies: 3
Views: 1102

Re: Rock stable beams

Ah, but looks can be deceiving … on “Page 1” the “Stable Beam” flags always remained red and set to “false.” This means that they never met the standard for “LHC Stable Beams.”
by LarryS
Fri Mar 19, 2010 1:50 am
Forum: The Accelerator
Topic: Older Events and discussion 3/22/10
Replies: 156
Views: 19786

Re: ** Current Events and discussion **

As I said in my previous post ... "things still need a bit of fussing."

Currently having beam quality problems on injection (chroma problems).
by LarryS
Thu Mar 18, 2010 11:23 pm
Forum: The Accelerator
Topic: Older Events and discussion 3/22/10
Replies: 156
Views: 19786

Re: ** Current Events and discussion **

Todays two ramps to 3.5 TeV did not go perfectly. According to the LHC / OP LOGS magnet RQTF.A81B1 tripped both times. While it never caused a quench, take a good look at the VISTARS / LHC / STATUS OP page; note that the energy plunges from 3.5 TeV to 0 (zero) on the second trip. However, VISTARS / ...
by LarryS
Thu Mar 18, 2010 11:45 am
Forum: End Of The World
Topic: Creating "Sparks"
Replies: 163
Views: 72758

Re: Creating "Sparks"

He who gives up freedom for security, deserves neither ... Benjamin Franklin