Post A0miE2qgbanYhPYDNQ by Poudingue@mastodon.social
(DIR) More posts by Poudingue@mastodon.social
(DIR) Post #A0mEFMGitHd0asRJHE by codewiz@mstdn.io
2020-11-02T04:48:31Z
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This is the entrance of KAGRA, the gravitational wave interferometer that detected the black hole merging event a while ago.https://gwcenter.icrr.u-tokyo.ac.jp/en/
(DIR) Post #A0mEXGckcGn6IdHZia by codewiz@mstdn.io
2020-11-02T04:51:46Z
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It's technically a telescope, but it's located 1000m underground. Its two arms at 90 degrees can detect the expansion in spacetime caused by a gravitational wave passing through the earth.I believe you need two of these detectors in two different places on earth to see the wave in 3 dimensions, and measure its direction.#physics
(DIR) Post #A0mFIUu1LYN6C5si92 by codewiz@mstdn.io
2020-11-02T05:00:18Z
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Hida, in Gifu prefecture, looks like a Miyazaki creation.
(DIR) Post #A0mFomkgWCSOosuWXY by codewiz@mstdn.io
2020-11-02T05:06:08Z
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This is a model of the KAGRA detector.
(DIR) Post #A0mRWugjTJOLffJ3iq by codewiz@mstdn.io
2020-11-02T07:17:21Z
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This is one of the photomultipliers of Super Kamiokande. #physics
(DIR) Post #A0mRb9v0mu5G470fzc by sohkamyung@mstdn.io
2020-11-02T07:18:05Z
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@codewiz Nice. I just read about it via this link.https://www.symmetrymagazine.org/article/japans-kagra-searches-the-sky-for-gravitational-waves
(DIR) Post #A0mRsYNf5jWur8hmJU by codewiz@mstdn.io
2020-11-02T07:21:16Z
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The detectors are located in a cave 1000m underground to shield them from muons from space...
(DIR) Post #A0mS24QZJMQGr0bQky by codewiz@mstdn.io
2020-11-02T07:23:00Z
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Super-Kamiokande has a total 13,000 detectors.
(DIR) Post #A0mSLtQNvhWgWKy8bA by codewiz@mstdn.io
2020-11-02T07:26:35Z
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Each one of these 13,000 glass "lamps" was hand-blown, Murano style...https://en.m.wikipedia.org/wiki/Glassblowing
(DIR) Post #A0mSkVJkhCwWzfbO7c by codewiz@mstdn.io
2020-11-02T07:31:01Z
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They were mounted all around a cistern containing 50,000 tons of pure water.This is a photo of the exhibit in the museum, not the real thing detector. There are onky a few dozen lamps and two mirrors facing each other to create the illusion of an infinite vertical wall.
(DIR) Post #A0mSsq3fT0GldV3LKS by loke@functional.cafe
2020-11-02T07:32:30Z
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@codewiz Is this at the visitor's centre?
(DIR) Post #A0mSw2JSMQXyVnxkQa by codewiz@mstdn.io
2020-11-02T07:33:06Z
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There's a whole underground lab filled with pumps, computers and consoles, like in a James Bond movie...
(DIR) Post #A0mU9nbbwEwauHa4Ke by codewiz@mstdn.io
2020-11-02T07:46:48Z
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An animation on an impressive cylindrical screen explains how detection works: when a neutrino "hits" a water molecule, it emits an electron or positron which moves faster than the speed of light *in water*, producing a tiny flash of Cherenkov radiation seen by the photomultipliers. #physicshttps://en.m.wikipedia.org/wiki/Super-Kamiokande
(DIR) Post #A0mV3yEJcmqc4eT95E by codewiz@mstdn.io
2020-11-02T07:56:57Z
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Neutrinos are incredibly elusive particles which normally travel all the way through our planet and even through the Sun as if they were transparent. The Super-Kamiokande was made huge to increase the chance of observing an interaction every now and then. #physicshttp://www-sk.icrr.u-tokyo.ac.jp/sk/index-e.html
(DIR) Post #A0miE2qgbanYhPYDNQ by Poudingue@mastodon.social
2020-11-02T10:24:25Z
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@codewiz very interesting serie of illustrated toots about Kagra, many thx ! There will be a live tour on YT for those who want to see more :"We will be hosting a series of live SK/KAGRA Virtual Open Days on November 22-23, 2020.). https://gwcenter.icrr.u-tokyo.ac.jp/en/archives/1455
(DIR) Post #A0mosSUTHyH7X9oWky by codewiz@mstdn.io
2020-11-02T11:38:58Z
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Is particle detector porn a thing? 😍I invoke Rule 34.https://en.m.wikipedia.org/wiki/Rule_34#physics #porn
(DIR) Post #A0mpVtjZvo8TK2gcFs by codewiz@mstdn.io
2020-11-02T11:46:07Z
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Is particle detector porn a thing? 😍I invoke Rule 34.https://en.m.wikipedia.org/wiki/Rule_34#physics #porn
(DIR) Post #A0mpw1gkymSDWPpElk by codewiz@mstdn.io
2020-11-02T11:50:49Z
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@loke unfortunately, it is. I'd work for free for the privilege of hacking on a giant scifi machine like this. 🤓
(DIR) Post #A0mqB2qsw6jvTQiyJM by codewiz@mstdn.io
2020-11-02T11:53:32Z
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@loke I'm more fascinated by the engineering side than the research. How do you read 13,000 sensors? How do you deal with the constant failures and spurious detections? How do you do the "bring up"? How do you test software updates (since there's only one production environment and no test environment)?
(DIR) Post #A0mr8TBUg0C2EAhRtw by loke@functional.cafe
2020-11-02T12:04:15Z
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@codewiz At least you can get to see the stuff. Do they have anything else of interest there? I mean, is it worth a trip to see the stuff?
(DIR) Post #A0mrZPDhWYF9kcZnCC by codewiz@mstdn.io
2020-11-02T12:09:08Z
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Thanks, @Poudingue. I wish Mastodon has an explicit UX for editing, publishing and viewing "stories".Threads sort of work already, but they're harder to discover for publishers and for readers. What do you think, @Gargron?
(DIR) Post #A0mrdL1P4jO3t8hPu4 by Sacchan@wandering.shop
2020-11-02T12:09:50Z
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@codewiz Someone told me that they'd paddled around in there (I think it was a PR person but not sure) and it was really interesting, but hot.ALSO have you tried the jigsaw puzzle??
(DIR) Post #A0mxn5C3NX19Q1i7Rg by codewiz@mstdn.io
2020-11-02T13:18:51Z
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@Sacchan I saw a 500 piece jigsaw puzzle in the omiyage shop. I thought it would be close to impossible. Right?
(DIR) Post #A0my82D1fYdeFD9jo8 by codewiz@mstdn.io
2020-11-02T13:22:38Z
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@loke No, the trip is worth it only if you could get an insider tour...Or, as was the case today, if it's raining and you have viral gastroenteritis...
(DIR) Post #A0n1pJ8auAOj3tPPw8 by Sacchan@wandering.shop
2020-11-02T14:04:03Z
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@codewiz Yes, I definitely wouldn't describe it as easy! They released one with more pieces after I bought mine but I'm not brave enough to try