LHC portal

some background on Schottky measurements...

http://cdsweb.cern.ch/record/1213284/files/p407.pdf

this has less math, more diagrams:

http://www-bd.gsi.de/conf/juas/schottky_trans.pdf

from http://iopscience.iop.org/1748-0221/page/Landmark%20LHC%20Technical%20Reports%20published : "Journal of Instrumentation published jointly by IOP Publishing and the International School for Advanced Studies (SISSA) is proud to publish the complete scientific documentation of the CERN Large Hadro...

no prob.. you're welcome, mrgumby!

"exponent" - you might want to take a look at the Wikipedia entry for scientific notation

Can someone enlighten me as to what "1.87e+10" and other similar numbers actually means? I know it refers to beam intensity and I assume that it is a mathematical shortcut for a particular number of Protons.....But I don't know what "e" is and I don't really know what "+10" means (10 zeros?) my mat...

Kasuha wrote:I wonder what happened in the morning, both beams and energy went straight down all at once, doesn't look like standard procedure.

cryo loss in one of the sectors...

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 t...

So... Is there a place here or at the CERN website than can tell us what is going on? Such as "look for beems in two hours" or "collisions expected tomorrow" or updates on how the system is working and what they are doing? thx in advance... :clap: http://op-webtools.web.cern.ch/op-webtools/vistar/v...

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?

Anyone know what is the sampling rate of the data acquisition?

I see the comments now say: Preparing for ramp, then squeeze test.

I saw in one of the LHC docs there was some discussion of squeezing during ramp-up vs. squeezing at full energy, so I am wondering if they will now try squeezing during ramp-up.

The "intense peak" is the tune: it is supposed to be there. D'oh! thanks for the clarification. It does look like the signal at .33-.35 Frev is the fundamental since it covers the smallest Hz, .175-.21 Frev is the first harmonic (2x frequency spread in Hz), and .35-.42 Frev is the 2nd harmonic (3x ...

The hump scan they did today gives a lot of new info for wannabee hump hunters. hmmm. From the graphs, it looks to me like the interference has two main components. 1. a constant and pretty intense peak at .3 Frev, and 2. A varying component that looks like a mirror of the tune. Are they sure that ...

greeting from Washington DC.

been following lhc intently since the 3.5TeV collisions started, trying to learn more about how the whole thing works.