Search found 96 matches

by dukwon
Wed May 02, 2018 8:10 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 15172

Re: 2018 Operation

16L2 news: a combination of a bump and controlling the corrector current have dramatically reduced the loss spikes at 16L2 for B2. They are currently doing the same for B1, but it will only be effective until halfway through the squeeze. B2 is also behaving weirdly: a larger satellite population, de...
by dukwon
Wed May 02, 2018 5:02 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 15172

Re: 2018 Operation

I don't quite see how they can go to 2556 bunches if the max luminosity is limited to 2.0\nb/s.
There are more ways to control luminosity than number of colliding bunches. All IPs have routinely used levelling since last year.
by dukwon
Fri Apr 27, 2018 9:42 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 15172

Re: 2018 Operation

There's a new lumi plot interface on the LPC website:
https://lpc.web.cern.ch/cgi-bin/plots.py?year=2018
by dukwon
Thu Apr 26, 2018 6:09 am
Forum: Off topic
Topic: Meanwhile, in Japan...
Replies: 4
Views: 1142

Re: Meanwhile, in Japan...

They have had their first collisions:

https://www.kek.jp/en/newsroom/2018/04/26/0700/
by dukwon
Wed Apr 25, 2018 11:39 am
Forum: New Users Start Here
Topic: HI
Replies: 2
Views: 2058

Re: HI

Welcome!

Don't be put off by the lack of posts recently, and if you're an IRC user, check out #lhc on irc.gnome.org
by dukwon
Tue Apr 24, 2018 7:29 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 15172

Re: 2018 Operation

Good news: the intensity ramp is about 7–10 days ahead of schedule, although some of that extra time may be spent on extra MDs. Bad news: the problem at 16L2 has not gone away, and seems to be identical to last year. It was responsible for 5 dumps during the scrubbing run yesterday. As a reminder: 1...
by dukwon
Mon Apr 23, 2018 8:09 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 15172

Re: 2018 Operation

We've had 2 fills with 339b. Scrubbing all of today until tomorrow morning. Then a third 339b fill with 48 bpi. Might switch to 600b Wednesday afternoon.
by dukwon
Sat Apr 21, 2018 11:37 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 15172

Re: 2018 Operation

We've had 3 fills with 75b, where the third was with BCMS beams. I believe the next step will be 300b.
Currently scrubbing with 2605b. More scrubbing planned on Monday.
by dukwon
Wed Apr 18, 2018 1:37 pm
Forum: Off topic
Topic: Meanwhile, in Japan...
Replies: 4
Views: 1142

Re: Meanwhile, in Japan...

Hm, no, while the beam currents are higher than the LHC by a factor of ~5, the LHC still has 3 orders of magnitude more energy per particle. Maybe they just mean luminosity.
by dukwon
Wed Apr 18, 2018 1:32 pm
Forum: Off topic
Topic: Meanwhile, in Japan...
Replies: 4
Views: 1142

Re: Meanwhile, in Japan...

Stored energy in the ring, perhaps? It's certainly the highest-luminosity collider (800 kHz/µb)
by dukwon
Wed Apr 18, 2018 11:51 am
Forum: Off topic
Topic: Meanwhile, in Japan...
Replies: 4
Views: 1142

Meanwhile, in Japan...

There will be a livestream starting Friday 12:00 (Japanese time) for the first collisions of SuperKEKB https://www.kek.jp/en/newsroom/2018/04/12/1300/ If you want to watch some monitoring plots, there are some here: http://www-linac.kek.jp/skekb/snapshot/dailysnap.html http://www-linac.kek.jp/skekb/...
by dukwon
Tue Apr 17, 2018 11:10 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 15172

Re: 2018 Operation

Screenshot from 2018-04-17 13-07-37.png
3DTower.png
Screenshot from 2018-04-17 13-07-00.png
by dukwon
Tue Apr 17, 2018 11:02 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 15172

Re: 2018 Operation

Stable beams with 3 bunches per beam!
lhc1.png
by dukwon
Mon Apr 16, 2018 6:47 pm
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 15172

Re: 2018 Operation

Latest news is that we could see stable beams after tomorrow's morning meeting (so in about 12 hours or more)
by dukwon
Sat Apr 14, 2018 11:21 am
Forum: The Accelerator
Topic: 2018 Operation
Replies: 78
Views: 15172

Re: 2018 Operation

ADT tests (necessary for train injections and abort gap cleaning) have been given priority over first stable beams w/ 3b, so the latter has been pushed back to Tuesday.