LHC
The world's largest particle accelerator, located at CERN and used for high-energy physics experiments. It produces petabyte-scale collision data each year.
Core Facts
Timeline (last 90 days)
The Large Hadron Collider (LHC) generates data on the scale of petabytes per year.
The LHC trigger system uses a multi-level architecture: the first level performs coarse filtering on hardware such as FPGAs at the microsecond scale, reducing the event rate from 40 MHz to about 100 kHz; the high-level trigger further reduces it in compute farms using software algorithms to a few thousand recorded events per second.
A full Monte Carlo simulation of a complete LHC event may take from several minutes to several hours.
Metrics for trigger filtering include signal efficiency, background rejection rate, and physics acceptance at a given false trigger rate.
If extra dimensions are curled up near the Planck scale, their effects would appear only at energies close to the Planck energy (about 10¹⁹ GeV), far above the TeV scale reachable by current accelerators such as the LHC.
Some models (such as large extra dimension models) predict that extra dimensions could be larger, thereby producing observable signals at the LHC.
The LHC searches for indirect evidence of extra dimensions through experiments such as ATLAS and CMS, for example missing-energy signals or deviations in gravity at short distances, but none has yielded a positive result.
All Facts (19)
In 2012, the LHC successfully discovered the Higgs boson.
65%UnverifiedDon Lincoln是费米实验室的资深物理学家，参与了大型强子对撞机（LHC）的CMS实验
90%UnverifiedLHC迄今未发现超对称粒子或其他超越标准模型的新物理迹象
90%Unverified即使只积分到当前可测量的能量尺度（LHC尺度），真空能量预测与观测的差距仍为10的60次方倍
90%UnverifiedLHC每秒产生约10亿次碰撞，每秒有约4000万个时间窗口，每个窗口内可能同时发生约20次碰撞
85%UnverifiedLHC每次碰撞的能量约为费米实验室Tevatron的7倍，碰撞率约为Tevatron的100倍
85%UnverifiedLHC的加速链包括Linac4（160 MeV）、PSB（2 GeV）、PS（26 GeV）、SPS（450 GeV），最终在主环达到6.5-7 TeV
85%UnverifiedLHC每秒碰撞次数是费米实验室的10倍，能量高出3.5倍
85%Unverified普朗克尺度比目前能测量的最高能量大10的15次方倍
85%Unverified在LHC上现在每秒就能产生一个顶夸克，顶夸克从诺贝尔奖级发现变成了需要清除的背景噪声
80%UnverifiedLHC第一级触发系统必须在2.5微秒内做出决定，完全由定制的FPGA和ASIC硬件实现
80%UnverifiedThe LHC is located approximately 100 meters underground near Geneva, Switzerland, on the Franco-Swiss border, and has a circumference of approximately 27 kilometers.
60%UnverifiedThe Large Hadron Collider (LHC) generates data on the scale of petabytes per year.
50%UnverifiedThe LHC trigger system uses a multi-level architecture: the first level performs coarse filtering on hardware such as FPGAs at the microsecond scale, reducing the event rate from 40 MHz to about 100 kHz; the high-level trigger further reduces it in compute farms using software algorithms to a few thousand recorded events per second.
50%UnverifiedA full Monte Carlo simulation of a complete LHC event may take from several minutes to several hours.
50%UnverifiedMetrics for trigger filtering include signal efficiency, background rejection rate, and physics acceptance at a given false trigger rate.
50%UnverifiedIf extra dimensions are curled up near the Planck scale, their effects would appear only at energies close to the Planck energy (about 10¹⁹ GeV), far above the TeV scale reachable by current accelerators such as the LHC.
50%UnverifiedSome models (such as large extra dimension models) predict that extra dimensions could be larger, thereby producing observable signals at the LHC.
50%UnverifiedThe LHC searches for indirect evidence of extra dimensions through experiments such as ATLAS and CMS, for example missing-energy signals or deviations in gravity at short distances, but none has yielded a positive result.
50%