A new record run
In the evening of Saturday May 15, we have reached a new peak luminosity record of 6 1028 cm-2s-1
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Lucie de Nooij
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Nitesh Soni
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Putting the Squeeze on the Protons
It took a little bit of time, but the wait was worth it. The LHC has successfully achieved its first physics run with "squeezed beams"!
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One in a few million
ATLAS has been designed to detect rare events in high energy proton-proton collisions. ATLAS ultimate goal is to measure events as rare as one in several thousand billions, but we are modest (for the time being) waiting for the luminosity to rise.
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Rachid Mazini
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Its All About The Lumi!
Now that the LHC has established colliding stable beams at a center of mass energy of 7 TeV, the next step to maximize its physics reach is to provide the most luminosity possible. As Leo posted, we need to increase the number of proton - proton collisions to make sure we have a chance of seeing the physics that we are looking for. The reason for that is because different p.hysics processes have different probabilities. These probabilities are referred to as cross-sections (in a vague reference to the particle's size). If one multiplies a cross section by a luminosity than what you get is a number of events.
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Life Imitating Reality
I was home sick today, probably from the stress of getting ready for "M-Day" (aka Media Day), more likely though I finally succumbed to the cold that had been spreading through the Control Room. As it so happened, my laptop had been in the shop because it experience an "incident" (actually I just dropped it) last Monday (the week before Media Day), and I just picked it up yesterday.
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Increasing collision rate
Many collisions will be needed to unveil the secrets eventually hidden at the 7 TeV energy regime.
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Let The Physics Begin!
After decades of planning. After years of delays and immeasureable amounts of patience and hard work. The physics operations of the LHC has begun!
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First 7 Tev collisions have been recorded in ATLAS
After ramping of the beams to 3.5 TeV and tuning, final checks, and some emotions due to an unforeseen beam dump, the 7 TeV collisions finally appeared on the on-line monitors of the ATLAS Control Room.
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Expecting beam in 30 minutes!
During this morning LHC has been working to give us the beam conditions for collisions.
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Jean-Baptiste Blanchard
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How will it happen?
So how will this whole "First 7 TeV Collisions" event happen? Well, here is my (somewhat naive) understanding of what will happen.
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Approaching the End...and a New Beginning
This Tuesday, if all goes according to plan, will mark the end of a very long journey for many High Energy Physicists. The first 7 TeV Collisions will signal the end of the the commissioning period of the LHC and its experiments.
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Big step forward in LHC operation last night
Last night a new very important milestone has been reached by the LHC: two counter-circulating proton beams have been accelerated for the first time to 3.5 TeV, the energy that they should routinely reach in the 2010-2011 running period.
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ATLAS Experiment Reports Its First Physics Results from the LHC
The first physics results from the ATLAS Experiment with proton-proton collisions at an energy of 0.9 TeV in late 2009 have now been accepted for publication in the journal Physics Letters B.
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3 Firsts for ATLAS in 2010
It has been a BUSY weekend! The LHC has been working around the clock get the machine commissioned, and ATLAS has been enjoying the many Firsts that have resulted.
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ATLAS celebrating the International Women's day!
Today ATLAS celebrates the role of women in physics its own way. ATLAS has encouraged its staff and users to place as many women as possible on shift in the control room and to serve as guides for official visits.
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Jim Degenhardt
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A titan awakes
At approximately 2:40 am Central European Time, ATLAS saw particles from the LHC for the first time in 2010. As in previous LHC turn-on periods the first thing we see are beam splashes from the LHC beams as they slowly thread the beam through the LHC ring for the first time.
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The calm before the storm
The Control Room is quiet. The configurations are set. The trigger menu is uploaded. The shifters are ready. All that is left is for the LHC to deliver beam.
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Gearing-up for the 2010 run!
ATLAS has been taking cosmic rays data this month exercising new features of the data acquisition, including protocols to start and control the run.
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Rolf Seuster
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Germán Carrillo
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