Tag Archives: LHC

CERN LHC Long Shutdown 2 (LS2)

Run 2 (2015-2018) of CERN LHC operations ended.  There will be no physics experiments for the next 2 years. CERN accelerator complex will be upgraded during the long shutdown between now and spring 2021. During Run 2 each proton was … Continue reading

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Super performance of the Large Hadron Collider in 2016

The Large Hadron Collider (LHC) at CERN concluded its 2016 proton-proton run.  Integrated luminosity delivered by the LHC this year was far above the expectation. The following graphs summarize the performance numbers. For a definition of (inverse femtobarn) see this blogpost.

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Matthew Buckley’s particle physics tutorial articles at Boston Review

I highly recommend Matthew Buckley’s review articles at Boston Review. These are excellent tutorials. “This eight-part series maps the frontiers of contemporary particle physics. It begins with an introduction to the world’s most powerful particle accelerator, the seventeen-mile-long Large Hadron … Continue reading

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Large Hadron Collider (LHC) is breaking performance records

The Large Hadron Collider (LHC) has reached its design luminosity: . This is a significant milestone. I congratulate everyone who was involved in the design, construction and operation of the LHC. I also congratulate everyone who work on the accelerators that feed … Continue reading

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What is an inverse femtobarn?

Image credit “A barn (symbol b) is a unit of area. Originally used in nuclear physics for expressing the cross sectional area of nuclei and nuclear reactions, today it is also used in all fields of high-energy physics to express … Continue reading

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Live Beam Status at LHC

Happy mother’s day! LHC beams are colliding at 13 Tev (center-of-mass) energy again. The 4 LHC experiments (ATLAS, ALICE, CMS, LHCb) are collecting data. They are back in business after the long winter shut-down. You can watch the status of … Continue reading

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Large Hadron Collider Status Reports (September 23, 2015)

LHC Machine Status Report       ATLAS Status Report     CMS Status Report       LHCb Status Report     ALICE Status Report       TOTEM Status Report       LHCf Status Report     … Continue reading

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Slides from the LHC (Large Hadron Collider) Morning Meetings

Accelerator physicists, engineers and technicians have daily meetings in the mornings and discuss LHC (Large Hadron Collider) status. The summary presentations are posted at the following address: https://indico.cern.ch/category/6386/ You can select the week and click on the link then you … Continue reading

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First 13 Tev proton-proton collisions at the Large Hadron Collider

My heartfelt congratulations to the physicists, engineers and technicians of the Large Hadron Collider (LHC) at CERN. They accelerated protons to 6.5 Tev energy while keeping them in 27 km circumference circular orbits. They also made these counter circulating protons collide … Continue reading

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CERN LHC (Large Hadron Collider) is waking up

The Large Hadron Collider at CERN is waking up after a 2 year shutdown for major upgrades. My piece “The Pause that Refreshes: CERN LHC 2-year shut-down” from 2 years ago explains that these upgrades were necessary to double the … Continue reading

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Internalizing ideas and theories

Apparently the subject of internalization is widely studied in academic psychology and sociology. I am not an expert in the academic aspects of internalization but I am cognizant of my own mental processes. I wanted to share some of my … Continue reading

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ILC (International Linear Collider)

The Large Hadron Collider (LHC) at CERN can be thought of as a giant microscope. In LHC physicists collide proton beams against each other and look for new particles in the collision debris. If the proton beams are energetic enough … Continue reading

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The pause that refreshes: CERN LHC 2-year shutdown

The Large Hadron Collider (LHC) at CERN was shut down on Feb 14, 2013.  LHC will be down for the next two years. This is a pause that refreshes. The entire accelerator chain at CERN will be upgraded during this … Continue reading

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Supercollider – a failed dream

After ten years of planning and spending $2 billion in construction costs, US Congress canceled the dream project Supercollider for particle physics in 1993. Cynics often say that the role of the government is to transfer money from public to … Continue reading

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What is Spin?

Spin is one of the fundamental properties of elementary particles. Electron and its antiparticle positron have spin=1/2. Photon which has no antiparticle has spin 1. The elementary particles known as fermions and their antiparticles (constituents of matter) have spin=1/2 and … Continue reading

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