Current Events Discussion

The place to discuss the LHC. Commissioning, operation, issues, events ....
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CharmQuark
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Re: Current Events Discussion

Post by CharmQuark » Sat Apr 17, 2010 2:19 pm

LarryS wrote:No, No, No, it is "date" based:

May the 4th ... be with you

LMAOOOOOOOOOOOOOOOOOOOOO :clap: that works so well :whistle:
Anyone who doesn't take truth seriously in small matters cannot be trusted with large ones either by Albert Einstein.

Kasuha
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Re: Current Events Discussion

Post by Kasuha » Sat Apr 17, 2010 5:36 pm

I wonder where did B2 go?

tomey36
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Re: Current Events Discussion

Post by tomey36 » Sat Apr 17, 2010 8:33 pm

i gueess they decided they didnt need it.

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mrgumby
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Re: Current Events Discussion

Post by mrgumby » Sun Apr 18, 2010 12:37 am

This is not a post it is a screwup...... :oops:
Last edited by mrgumby on Sun Apr 18, 2010 12:42 am, edited 1 time in total.

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mrgumby
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Re: Current Events Discussion

Post by mrgumby » Sun Apr 18, 2010 12:39 am

LarryS wrote:No, No, No, it is "date" based:

May the 4th ... be with you
We should vote on it....

may the "for"s be with you..

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CharmQuark
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Re: Current Events Discussion

Post by CharmQuark » Sun Apr 18, 2010 1:41 am

mrgumby wrote:
LarryS wrote:No, No, No, it is "date" based:

May the 4th ... be with you
We should vote on it....

may the "for"s be with you..
:lol:
Anyone who doesn't take truth seriously in small matters cannot be trusted with large ones either by Albert Einstein.

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Xymox
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Re: Current Events Discussion

Post by Xymox » Sun Apr 18, 2010 7:56 am

May the upcoming 4 20 be a good day for you.

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March_Hare
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Re: Current Events Discussion

Post by March_Hare » Mon Apr 19, 2010 4:27 pm

LarryS wrote:If the Strong Force brings them together ... how can the then separate again?
Hawking radiation? :occasion-santa:
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tomey36
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Re: Current Events Discussion

Post by tomey36 » Mon Apr 19, 2010 5:49 pm

how much longer are they going to do squeez commissioning? isn"t it about time for collisions with squeezed beams!

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DCWhitworth
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Re: Current Events Discussion

Post by DCWhitworth » Mon Apr 19, 2010 5:58 pm

tomey36 wrote:how much longer are they going to do squeeze commissioning? isn"t it about time for collisions with squeezed beams!
They've listed 14 days for commissioning squeezing, higher intensity beams and physics with partial squeeze.

My impression of the squeeze commissioning is that things are going a bit slowly relative to the plan, but the plan is just that, a plan. There's no fixed deadlines, they'll take as long as they feel they need to get things working properly, you can't hurry this sort of stuff.
DC

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Kasuha
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Re: Current Events Discussion

Post by Kasuha » Mon Apr 19, 2010 7:01 pm

I'm pretty sure they'd go forward if they had it done. Just now I can see they lost about half the beam intensity when squeezing IP8 so apparently they still need to figure out how to do it better. Losing so much (and in fact even way less) at ultimate beam intensity would mean damaging the machine.
They had quite a few problems during last few days too, accidental beam dumps while commissioning do not speed things up.

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mrgumby
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Re: Current Events Discussion

Post by mrgumby » Mon Apr 19, 2010 9:38 pm

It seems that higher intensity beams + squeezing = dump at the moment. There is too much at stake and too much risk of damage to hurry things. Its only 20 days since the first 7TeV collisions so things are moving along quite quickly.
Patience is required. :)

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Re: Current Events Discussion

Post by Kasuha » Tue Apr 20, 2010 7:07 am

Problems they had with sirens was rather funny. Looks like destroying a siren in the LHC tunnel is a viable way of getting whole LHC out of order...

Glacialis
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Re: Current Events Discussion

Post by Glacialis » Tue Apr 20, 2010 5:21 pm

Can you post a link to the siren issue, or give more details? Sounds like the stuff that in-joke legends are made of.

Kasuha
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Re: Current Events Discussion

Post by Kasuha » Tue Apr 20, 2010 8:03 pm

It's mentioned in yesterday's presentation:
19:00: Access finished and machine closed:
- Problems closing the tunnel (sirens); beam only back at 03:00am.

Before they can start using the accelerator, all people must leave the tunnel. A siren must go for five minutes to warn everybody in that area to leave. One of these sirens was malfunctioning and the system did not let them start till they repaired it, which took several hours.

On serious note, leaving someone down there during work might be deadly so all these security measures have good reason. The funny part is just that there apparently is no backup procedure for a malfunctioning siren such as someone personally checking the tunnel or double checking all employees are out.

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