Inside Japan's big physics | Part two : KAGRA
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- Опубликовано: 5 фев 2020
- In the second of a new three part series, we go behind the scenes of KAGRA, the world’s most advanced gravitational wave detector.
For more than half a century, Japan has been at the forefront of 'big physics', asking fundamental questions about the laws which govern the workings of the universe. Questions of this magnitude require cutting edge technology on a truly massive scale. Over three episodes, Nature reporter Davide Castelvecchi travels across to Japan to get a rare look inside three of its flagship experiments.
Part one: Super Kamiokande - • Inside Japan's Big Phy...
Part three: Belle II - • Inside Japan's big phy...
Read more about KAGRA: www.nature.com/articles/d4158...
Sign up for the Nature Briefing: An essential round-up of science news, opinion and analysis, free in your inbox every weekday: go.nature.com/371OcVF 
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Today we have built these engineering marvels, performing stunning experiments to prove the ideas Einstein have had in his mind through his 'thought experiments'.
Such a beautiful doc. What a stunning experiment, with gorgeous animations. Well done team!
Holy cow! This is crazy ... & why on earth this have soo many less views
I'm in love with this series
Wonderful series! Thank you for doing this so much. I wish there was more stuff like this - documentarians traveling around bringing Big Science to the masses. Good job.
I'm watching this video four years later after the video was uploaded, so Japanese technology should be extremely improved by now. I've realized that one of Japan's most greatest advanced industry is *physics* and *robotics*. Amazing work, both enginners, animator, and especially the narrator. Btw, you have so much a good experience!!! 🤖😃🗾
Salutation from France, it's really an amazing hard work engin? Frankly, the japanese are among the best in technology création in the world. And it's not over yet?
Extraordinary!
Very interesting
KAGRA was supposed to come on line Dec. 2019. what is it's status now?
The detector is likely to come online at the end of this month - there have been a few technical glitches (to be expected) as well as detection distance sensitivity issues that are being resolved.
Amazing technology, but how does an experiment requiring the upmost sensitivity reside in region of the world that has the most earthquakes per year?
4:30 aaaaahhhhhhmm I think maybe that mirror is tilted the wrong way....
@Harvinder kalsi I don't think so. the beam originates from the lower right and will never be injected into the "vertical" beam tube in this configuration and the returning beam from the mirror at the end of the vertical beam tube will not be reflected back into the detector in this configuration, but back down the horizontal beam tube. If the mirror is flipped such that it looks like a backslash instead of a forwardslash, then it works correctly.
@@Muonium1 Haha this is a common frustration amongst the interferometer people peoppe who work as the collaboration. In actual fact, this is correct because the beam is coming from the bottom here, not the bottom right, that's the photo diode.
No, my mistake, I've fallen into the beam splitter trap myself, I think Muonium is correct haha
Let's get Physical...
Are they trying to find the source of the gravitational waves outside our solar system? (Just saw the video once)
Yes, With the 3 detectors, a position is triangulated, but with more, more gravitational waves from more places in space could be detected
KAGRA AKA The biggest, fastest game of "Snake" ever created
The cooling technic reminds me of James webb
Subtitles in english of the spoken text would faciliate understanding.
Silly me, it's in the settings
@@patrikeschle Gets me sometimes too!
Km? Kelvin•metre? I don't get it.
"Even in an electric vehicle, it takes us 10 minutes to do what the laser does in microseconds."
-Let's race a laser in a vehicle! -I don't know, how fast does a laser go? -Good point, let's make it an ELECTRIC vehicle!
I could listen all day long to Japanese people saying "neutrino".
"one of nature's physics reporters" makes it sound like he's part of the natural world, like how you say a tiger is "one of nature's to predators"
A premiere 47 hours from now? You guys realize this is how to get your videos to have no views
Call it Kagura already god dammit!
Gravitational waves have never been detected, because they don't exist.
The LIGO-Virgo Collaboration has never published a calibration curve of detector displacement versus known laser input in the attometre range. Without a relevant calibration curve it is not possible to draw any conclusions from a measured detector signal to the strength of an alleged gravitational wave. Nonetheless, in their discovery paper the LIGO-Virgo Collaboration falsely claimed to have calibrated by means of known laser input for corresponding detector displacement. They state in their discovery paper:
"The detector output is calibrated in strain by measuring its response to test mass motion induced by photon pressure from a modulated calibration laser beam . ... the detector response to gravitational waves is tested by injecting simulated waveforms with the calibration laser."
Not only have they never published the required calibration curve, professor Karsten Danzmann of the Vigo Team confessed to Dr. Wolfgang Engelhardt (retired, of the Max Planck Institute), that the required calibration curve does not exist [see 1,2,3,4]. For months Danzmann stalled. Only after he found himself potentially before a German court of law to provide the calibration data according to German law, did he confess that the necessary calibration curve does not exist. He subsequently removed the calibration paper [5] from his profile on ResearchGate. The required calibration curve does not exist because it cannot be measured. Recall that the LIGO-Vigo Collaboration claims measurement of a length one ten thousandth of the diameter of a proton.
Furthermore, GW170814 proves that their published strain curves are not measurements, but the result of simulations. They publish equal strain of 5x10^(-22) as measured on all three interferometers, but due to different orientation of Virgo with respect to the wave front, the strain in Pisa would have been much less than in the US.
Anybody can confirm Danzmann's confession as to the non-existent calibration curve by writing to him and requesting his confession anew: danzmann@aei.mpg.de
[1] www.kritik-relativitaetstheorie.de/2018/12/luitpold-mayr-theorie-der-zeit/
[2] www.kritik-relativitaetstheorie.de/2013/08/petition-beim-bundestag-wegen-datenmanipulation-beim-experiment-hafelekeating/
[3] www.change.org/p/prof-karsten-danzmann-beantworten-sie-bitte-3-fragen-über-das-ligo-experiment/u/23649808
[4]www.kritik-relativitaetstheorie.de/2018/11/umstrittenes-ligo-experiment-physiker-bezweifeln-nachweis-von-gravitationswellen/
[5] PHYSICAL REVIEW D 95, 062003 (2017)
@Ψ : No, you are wrong. The Earth is not flat.
@@stevecrothers6585 Denial is not going to make the evidence disappear.
@@AliothAncalagon there is no evidence. Also gravitational waves have been detected before…
@@mat7can106 What are you trying to say?
It seems as if you wanted to deny the evidence for gravitational waves only to then claim that evidence exists in the next sentence.
@@AliothAncalagon I replied to the wrong comment but what I’m saying is there’s not evidence that the earth is flat and that gravitational waves are proven to exist.
Imagine loosing all this information and technology just because of some world leader that only wants war. Painful.
lose the music.
Interesting story, but the background music is a bit racist, no?
No.
wtf dude
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lol
its jaaapaaaan rrroflflff