# CERN Particle Accelerators: Global Infrastructure and LHC
> An overview of global particle accelerator infrastructure, CERN history, Large Hadron Collider (LHC) detectors, and the 2017 technical upgrades.

Tags: particle-physics, cern, lhc, accelerator-infrastructure, science, scientific-research, physics
## Particle Accelerators: Beyond the Front Line of Physics
* A deep dive into CERN and global infrastructure.
* Focused on operational evolution and the 2017 technical surge.

## Global Accelerator Infrastructure
* **Quantity:** Estimated 30,000 to 50,000 particle accelerators worldwide.
* **Applications:**
    * ~33% Medical Application (Cancer Therapy)
    * ~33% Industrial Use (Ion Implantation)
    * <1% High-Energy Scientific Research
* **Key Regions:** North America, Europe, Asia Pacific, MEA, and Latin America.

## CERN: A Legacy of Scaling
* **1957:** Synchrocyclotron
* **1959:** Proton Synchrotron (PS)
* **1976:** Super Proton Synchrotron
* **1989:** Large Electron-Positron (LEP)
* **2008:** Large Hadron Collider (LHC)

## The Detectors: Eyes on the Invisible
* Eight massive experiments at the LHC function as colossal microscopes.
* **Major Experiments:** ATLAS, CMS, ALICE, LHCb, MoEDAL, TOTEM, LHCf, and FASER.
* **Scale:** CMS features components weighing over 2,000 tons.

## The 2017 Operational Pivot
* **17-Week Infrastructure Upgrade:** Replaced superconducting magnets and installed a new SPS beam dump.
* **Key Performance Target:** Reached 2x design luminosity.
* **Metric:** 45 fb⁻¹ year-end target achieved after the April 2017 restart.
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