Older Events and discussion 3/22/10
- DCWhitworth
- LHCPortal Guru
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Re: ** Current Events and discussion **
Pre-cycling now, looking good
DC
The LHC - One ring to rule them all !
The LHC - One ring to rule them all !
Re: ** Current Events and discussion **
Both beams back at 2032.
- BillyPilgrim
- Posts: 7
- Joined: Fri Nov 20, 2009 11:05 pm
Re: ** Current Events and discussion **
It looked like a disaster when first we heard of a fire, alarms etc. But I take solice in the facts that the machine has been running fantastic. We see a nQPS system that is sometimes too sensitive, beams circulating and systems performing as designed. So it appears that an emergency stop system, or circuit, or device triggered the latest scary event. Instead of worry, I rejoice that an emergency stop system worked. Power was cut, beams of (n)energy and intensity were effectively dumped safely, without damage to machine, man, or planet. Inject and dump studies suggest that all this can function, but there is nothing like an unplanned push of the button to truly test the system. It appears that it works. Congrats CERN. A marvelous machine indeed. Onward to greater energies and discoveries!!
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- LHCPortal Guru
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Re: ** Current Events and discussion **
I wonder if it's "Scheduled F..."? Going by how all the SFs are a fair way in the future and are a whole shift, it might be scheduled slack time of some sort.
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- LHCPortal Guru
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Re: ** Current Events and discussion **
Darn Vistars are stuck. 21:42:09.
Reset the Display Crate!
Seems like a lot of rebooting crate going on. A lot of crates I suppose. Any one know about how the multi processor network is managed? Heartbeat?
Reset the Display Crate!
Seems like a lot of rebooting crate going on. A lot of crates I suppose. Any one know about how the multi processor network is managed? Heartbeat?
Re: ** Current Events and discussion **
Funny thing is that the ALICE site is still showing the Page 1 status notes - maybe these are sent through a different system than the VISTARs?
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- LHCPortal Guru
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Re: ** Current Events and discussion **
I'm guessing but what I found was this; "RESQP execution steps (SF: Safe failures, DF: Dangerous failures, MF: Main failures)." from document ( https://lhc-commissioning.web.cern.ch/l ... ober09.pdf ~5MB
So I guess it's testing the various systems under various conditions to ensure Safe Failure.
As I say only a guess as there are several days in the schedule http://lhc-commissioning.web.cern.ch/lh ... hedule.pdf allocated to "SF".
Any more guesses or even confirmed fact? lol
Re: ** Current Events and discussion **
The reporting via LHCPortal and MELTRONX are both frozen at the exact same times. Viewing the LHC OP logs shows this is the exact point when the "ramp-up" reached 1.18 TeV. This was followed by some cryo problems and some "trips" during the following "ramp-down."
From what I can interpret it is a series of small problems and with nothing major.
From what I can interpret it is a series of small problems and with nothing major.
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- LHCPortal Guru
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Re: ** Current Events and discussion **
LarryS wrote:The reporting via LHCPortal and MELTRONX are both frozen at the exact same times. Viewing the LHC OP logs shows this is the exact point when the "ramp-up" reached 1.18 TeV. This was followed by some cryo problems and some "trips" during the following "ramp-down."
From what I can interpret it is a series of small problems and with nothing major.
It's the op-vistar sub system that's pooched.
If one checks CMS daq screen http://cmsonline.cern.ch/daqStatusSCX/a ... tusGre.jpg notice the upper left quadrant screen an image of LHC1 alternates with L1 scalers. If you CTRL+ a few times ( I have old eyes) you can see the time stuck there too but the cms clock time (just above LHC1 area) has current time.
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- LHCPortal Guru
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Re: ** Current Events and discussion **
Ok thanks for that,
So am I right in thinking there wont be any "new record" energy collisions before the end of march?
All i can see is ramps and testing with some 900 gev Collisions which im assuming is to fine tune the experiments?.
So am I right in thinking there wont be any "new record" energy collisions before the end of march?
All i can see is ramps and testing with some 900 gev Collisions which im assuming is to fine tune the experiments?.
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- LHCPortal Guru
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Re: ** Current Events and discussion **
Knowing how CERN likes pleasant surprises and the way the dates line up I wouldn't put it past them to try a few collisions on Fri 25 Mar. But who knows? Tuesday 30 th would be fine if they actually meet the timeline.
Uh Oh from the schedule it looks no beam till Friday " No beam from Thursday 04:00 onwards (nQPS work and cleaning of cryo filters) for 32 h!" from http://lhc-commissioning.web.cern.ch/lh ... -news.html.
Just a few more weeks.
Uh Oh from the schedule it looks no beam till Friday " No beam from Thursday 04:00 onwards (nQPS work and cleaning of cryo filters) for 32 h!" from http://lhc-commissioning.web.cern.ch/lh ... -news.html.
Just a few more weeks.
Re: ** Current Events and discussion **
Does anyone know when they will do the higher energy colissions?
- DCWhitworth
- LHCPortal Guru
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Re: ** Current Events and discussion **
Best you can says is "When they're ready" to be honest. Fairly soon I would thinkWallmott wrote:Does anyone know when they will do the higher energy colissions?
DC
The LHC - One ring to rule them all !
The LHC - One ring to rule them all !
Re: ** Current Events and discussion **
DCWhitworth wrote:Best you can says is "When they're ready" to be honest. Fairly soon I would thinkWallmott wrote:Does anyone know when they will do the higher energy colissions?
Have they done any collisions at all this year?