Let's keep an eye on the first collision of the SuperKEKB, the world's most-powerful accelerator !


The world’s most-powerful accelerator “SuperKEKB” began its operation last month. We will livestream the moment of the 1st collision, when electrons and positrons meet for the first time with this newborn machine.

On last April, we livestreamed the unification of the SuperKEKB accelerator and the Belle II detector with commentary of scientists which took over eight hours. This time we will go beyond. Since no one know when the 1st collision might happen, we decided to livestream until then.

Keep your eyes open and let’s enjoy the delighted moment together !

Overview of the livestream

TitleLet’s keep an eye on the first collision of the SuperKEKB, the world’s most-powerful accelerator !
Datefrom Apr. 20th (Fri) 12:00 until the 1st collision happens

Live streaming URL

Apr. 20〜 http://live.nicovideo.jp/watch/lv312372695
Apr. 23〜http://live.nicovideo.jp/watch/lv312661713
Apr. 26〜http://live.nicovideo.jp/watch/lv312711315
You need to create Niconico account to watch the “Timeshift”.


We will livestream from the Belle II shiftroom at B3 floor of the Tsukuba experimental hall. During lunchtime (12:00 - 13:00 UTC+09), we will have commentary on the experiment with researchers.

  • 12:00 - 13:00   LIVE streaming
  • 17:00 - 18:00   recorded streaming
  • 22:00 - 23:00   recorded streaming


We welcome questions about the SuperKEKB and the Belle II experiment. Let’s tweet with the hashtag #AskKEK to @kek_en or @kek_jp.

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