LHC Updates

[CharmQuark]

[chriwi]

Thanks Orion for the report.

[Stephen]

Any date yet for the actual collisions?

[Stephen]

That's pretty soon.

[CharmQuark]

If i start silently freaking out now then i should be alright before we actually start

[JNW]

The HCC main page updated today (27 Jan 2010) http://hcc.web.cern.ch/HCC/:

The LHC is being prepared for operations at 3.5 TeV:

* nQPS cables refurbishment is completed in all sectors

* ElQA HV test successfully performed on sectors 81 - 12 - 23 - 34 - 45. The test in ongoing in sector 56.


Sectors 81 - 12 - 23 - 34 are now managed by Hardware Commissioning Coordination:

Sector 12:

Powering in phase II ongoing.


Sector 81:

PIC2 tests successfully performed on RQD/F and RB (at 100A). RQD/F have been brought to injection (PLI1.b3) and then proper heaters firing has been verified. RRR measurement tests are ongoing.

Sector 23:

Powering in phase II ongoing.

Sector 34:

In preparation for powering.

[CharmQuark]

[Stephen]

"It’s a strange thing, but when you are dreading something, and would give anything to slow down time, it has a disobliging habit of speeding up." - Harry Potter and the Goblet of Fire.

The high energy collisions are approaching fast. Let's hope that everything goes okay, since there are going to be trillions of collisions. It's definitely a smart choice to take things easy and not rush for the 5 TeV energies so soon.

[CharmQuark]

Hiya Stephen

I am feeling the same as you i think you know this but i have been told many times over the past few weeks that there is nothing to worry about, makes sense but just the other night i went into freakout mode i got calmed pretty fast so it was not realy bad, your right we are heading into a scary time but also a very excing one and i have a feeling that they will be taking things slowly you know where i am if ya need me and remember stay happy

[JNW]

Looks like the LHC Cryo page has more green on it now: http://op-webtools.web.cern.ch/op-webto ... p?usr=LHC2

And the HCC main page has another update (30 Jan 2010): http://hcc.web.cern.ch/HCC/

The LHC is being prepared for operations at 3.5 TeV:

* nQPS cables refurbishment is completed in all sectors

* ElQA HV test successfully performed on sectors 81 - 12 - 23 - 34 - 45 - 56 - 67. Those sectors are now managed by Hardware Commissioning Coordination

Sector 81:

PIC2 tests successfully performed on RQD/F and RB (at 100A). RQD/F have been brought to injection (PLI1.b3) and then proper heaters firing has been verified. RRR measurement tests are ongoing.

Sector 12:

Powering in phase II ongoing. nQPS system hooked to the interlock loop.


Sector 23:

Powering in phase II ongoing. All 13kA circuits have been brought to 2kA. The nQPS system will be interlocked next week.

Sector 34:

Powering Phase II ongoing.

Sector 45:

Powering Phase I almost completed for the three 13kA circuits.

Sector 56:

Quench heaters power supply to be switched on next week.

Sector 67:

Quench heaters power supply to be switched on next week.

[chriwi]

according to the field sector 45 is also already in PO2 today, therby half of the ring is ready for 3.5Tev now.

beye

chriwi

[CharmQuark]

I like this

[DCWhitworth]

The 10 TeV collisions are likely to happen by June.

I think this is highly unlikely. The risk is likely too high for them to do this without a longer shutdown.

http://indico.cern.ch/getFile.py/access ... nfId=67839

"The current knowledge of the interconnect splices leaves no margin even for operation at 3.5TeV."

"5TeV running is excluded without major repairs after a warm up."

[Harbles]

The 10 TeV collisions are likely to happen by June.

I think this is highly unlikely. The risk is likely too high for them to do this without a longer shutdown.

http://indico.cern.ch/getFile.py/access ... nfId=67839

"The current knowledge of the interconnect splices leaves no margin even for operation at 3.5TeV."

"5TeV running is excluded without major repairs after a warm up."

Great find DC!

I believe the 1 Inverse fb at 7 TeV or Bust! http://blogs.discovermagazine.com/cosmi ... v-or-bust/? mode is in effect.

Small steps, don't break the apparatus and be patient.

[Stephen]

Great decision on their part. There's no need to rush anything.