What would I see if there was a porthole in LHC's detectors?

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Discussion Overview

The discussion revolves around the hypothetical scenario of observing phenomena through a porthole in one of the Large Hadron Collider's (LHC) detectors. Participants explore what visual experiences might occur, including the visibility of synchrotron radiation and the effects of radiation exposure in the collision chambers.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions whether they would see "ghostly little sparks" or be blinded by brightness if a porthole existed in the LHC's detectors.
  • Another participant suggests that synchrotron radiation could be visible, noting that while significant, it would not be overwhelmingly bright due to its dispersion in the tunnel.
  • There is mention of historical accounts where individuals reportedly saw X-rays due to retinal ionization, though this is not definitively ruled out.
  • A different perspective indicates that the detectors are not enclosed and are in air, suggesting that standing near the collision events might not yield visible phenomena, except for rare high-energy particles passing by.
  • This participant warns of the health risks associated with radiation exposure, particularly near the beam pipe where radiation levels are high.

Areas of Agreement / Disagreement

Participants express differing views on what might be visible through a porthole, with some suggesting visibility of synchrotron radiation and others indicating that little to nothing would be seen. The discussion remains unresolved regarding the exact visual experiences and safety implications.

Contextual Notes

Assumptions about visibility depend on the specific location relative to the collision events and the nature of radiation present. The discussion does not resolve the implications of radiation exposure or the conditions under which visibility might occur.

fbs7
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Question out of sheer curiosity: if there was a porthole in one of the LHC's detectors... would I see something? Like ghostly little sparks appearing out of nowhere, or would I be blinded by intense brightness?

Also, I know the collision chambers are in vaccum, but say I went in there with a spacesuit (with no magnetic materials, as I know there's an intense magnetic field in there) ... would I be fried by radiation?
 
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You could see the glow of synchrotron radiation. It will not blindingly because, while significant overall, it is spread over the huge tunnel. Regarding seeing the "flashes" of collisions, I have read a few accounts that back when radiation was not taken seriously, some people would see X-rays (apparently because they ionized their retina); I cannot rule this out.
 
Thank you.
 
You do not need portholes. The detectors are in air, without any case around them. For example, see http://www.phy.cam.ac.uk/research/hep/heppictures/LHCb_3.jpg of LHCb. It was made in 2006, but it still looks like this. You could even stand there while particles collide (assuming you can somehow trick the safety system), but it would be unhealthy due to the radiation. I would expect that you do not see anything just by standing there, or just some rare events of high-energetic particles passing your eyes. Close to the beam (in the beam pipe in vacuum), things are different, with really high radiation levels, synchrotron radiation and so on. The beam could easily burn a hole in anything in its path, but as soon as something moves in the beams are dumped within less than a millisecond.
 
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