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LHC Cycle Info

Posted: Sun Apr 04, 2010 1:33 pm
by Danny252
Some nice info on the progress page today:

End of Fill studies and requested time allocated - http://lhc-commissioning.web.cern.ch/lh ... udies.xlsx
Procedure from end of ramp to physics (basically, how to run the LHC in Physics mode!) - http://lhc-commissioning.web.cern.ch/lh ... edure.docx

Re: LHC Cycle Info

Posted: Sun Apr 04, 2010 6:23 pm
by Kasuha
I love the don't panic point.

Re: LHC Cycle Info

Posted: Sun Apr 04, 2010 10:14 pm
by Harbles
Now that looks like a check list to me. I guess it takes a while to figure out what the correct procedures are and they will change and the operators need to strictly follow them.

Re: LHC Cycle Info

Posted: Mon Apr 05, 2010 7:20 am
by Xymox
Whats with those file names adding a x at the end ??

Re: LHC Cycle Info

Posted: Mon Apr 05, 2010 10:20 am
by BillyPilgrim
M$ Office 2007 documents have default file names with the x at the end.

Re: LHC Cycle Info

Posted: Mon Apr 05, 2010 10:45 am
by Xymox
No kidding... M$ finally went to 4 char file names ? omg..

and what was wrong with .doc and .xls ? hahahahaha

Re: LHC Cycle Info

Posted: Mon Apr 05, 2010 12:12 pm
by Kasuha
Xymox wrote:No kidding... M$ finally went to 4 char file names ? omg..

and what was wrong with .doc and .xls ? hahahahaha
The files with the x at the end of extension are different format, a bit similar to the open document (MS just must do everything their way). They still support old .doc and .xls though, you can save or read files in that format but they'll not get updates with new features etc.

Re: LHC Cycle Info

Posted: Fri Apr 09, 2010 8:17 am
by pixelmasseuse
a couple Beam Setup questions:

what is precycling?

why is the E set to 297 GeV during beam setup? I always see it parked there prior to ramping up to 450 GeV for injection...

any clues on deciphering the SPS Visitar pages?

Re: LHC Cycle Info

Posted: Fri Apr 09, 2010 8:56 am
by Kasuha
Precycling is running all beam instruments (magnets etc) through a well defined cycle to avoid any magnetic hysteresis and changes to magnetic and electric fields caused by previous magnetic levels. It's similar to precision measuring instruments where you are only allowed to turn the screw in one direction and if you need to go back you must fully unscrew it and start again. Using the base energy level is part of it.

Re: LHC Cycle Info

Posted: Sun Apr 11, 2010 8:18 pm
by oxodoes
pixelmasseuse wrote:any clues on deciphering the SPS Visitar pages?
The vertical line gives the current position in the cycle. The blue line is proton intensity, the white line magnetic field strength (beam energy). I am not sure about the yellow line...

Re: LHC Cycle Info

Posted: Mon Apr 12, 2010 2:54 am
by pixelmasseuse
oxodoes wrote:
pixelmasseuse wrote:any clues on deciphering the SPS Visitar pages?
The vertical line gives the current position in the cycle. The blue line is proton intensity, the white line magnetic field strength (beam energy). I am not sure about the yellow line...

thanks... I eventually figured out that by manually refreshing the SPS1 display, you can see the movement of the vertical line better.

Re: LHC Cycle Info

Posted: Sat Dec 17, 2011 5:30 am
by williamrose2
Great work! I appreciated your effort and I'm so glad that you shared this to us. I will definitely look forward for your next post to learn more things from you.