LHC about to restart - some frequently asked questions

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Discussion Overview

The discussion revolves around the upcoming restart of the Large Hadron Collider (LHC) after a two-year hiatus, addressing common misconceptions and questions about working at the LHC, the nature of its experiments, and visitor experiences. It includes aspects of operational procedures, data analysis, and potential visitor activities at CERN.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested
  • Meta-discussion

Main Points Raised

  • Some participants clarify that working for the LHC means working for one of its experiments, with significant data analysis conducted remotely rather than on-site at CERN.
  • It is noted that the LHC produces vast amounts of data that require filtering and analysis, with a worldwide computing grid facilitating access.
  • Participants discuss the operational aspects of the LHC, including the nature of proton collisions and the challenges in focusing protons for collisions.
  • There is mention of the types of particles studied by LHC experiments, emphasizing that many particles decay before reaching the detectors.
  • Some participants express disappointment regarding the inability to visit the LHC during a school trip, suggesting alternative activities in Geneva.
  • Concerns are raised about the behavior of tour groups at CERN, with a reminder of the importance of respecting the working environment of scientists.

Areas of Agreement / Disagreement

Participants express a mix of excitement and disappointment regarding visits to the LHC, with some agreeing on the importance of respecting the work environment while others focus on the missed opportunities for tours. There is no consensus on the best way to engage with CERN during visits.

Contextual Notes

Limitations include the lack of clarity on specific visitor policies and the operational status of various facilities at CERN during the LHC's restart. The discussion reflects varying expectations and experiences regarding tours and access to the LHC.

Who May Find This Useful

Individuals interested in particle physics, those planning visits to CERN, and students studying related fields may find this discussion relevant.

  • #61
Hyperphysics - HTS
Wiki HTS
https://www.physicsforums.com/search/603685/?q=high+temperature+superconductors&o=relevance
 
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  • #62
6.5 TeV pilot bunches have circulated in both directions.
 
  • #63
Experiments are seeing beam-gas collisions.
 
  • #64
Vanadium 50 said:
Experiments are seeing beam-gas collisions.
Meaning beam - neutral collisions?
 
  • #65
Collisions with remaining gas (mainly hydrogen) in the beam pipe. Those collisions are highly asymmetric and of low energy as they are basically fixed-target experiments.
Still useful to see if the detectors are working properly.
 
  • #66
In this run of LHC ( 2015) , are we doing the investigation of spin and other related parameters of "the proton"?
 
  • #67
No, the LHC experiments are not sensitive to properties of the proton as hadron - they see its components (quarks and gluons) only, those get studied.
Other experiments at much lower energy are used to study protons as effective particles.
 
  • #68
Thanks mfb .
As per the theory is concerned the spin of the proton is the sum of the spins and angular momenta of its constituent particles that is quarks and gluon.But it is known that this sum is not equivalent to 1/2 ,which is the spin of the proton,something which contribute in the spin of the proton is missing. My question is - in this LHC run will we compute the spins of quarks and gluon? Do we collide polarized and unpolarized protons ?
 
  • #69
The proton beams are unpolarized - it is not relevant for the main physics goals and polarizing them to a reasonable degree would be additional effort. I would guess that HERA data is much better even if the LHC had polarized protons.
 

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