LHC status 1

Wednesday 13th February - last 24 hours

13-02-2013

07:41 Programmed dump of fill 3556 (510 bunches) after 5h 26min 09:01 Start injection of fill 3557 (1347 bunches) 10:30 Stable beams, initial lumi ~90E30 11:32 Beam dump

BLM spurious trigger on a BLM optical board in R1

14:07 Stable beams fill 3558, initial lumi above 100E30 15:15 Beam dump

RF fault

16:25 LHC in access mode (RF + MQK) 20:25 Patrol started in PM45 (lost during access) 21:39 Ready for injection

dump test for XPOC data collection test

22:40 Stable beams fill 3559 – initial lumi ~120E30 07:00 Beams dumped by OP

~2 pb-1 in 8h30m

Thanks to Matteo Solfaroli

for the slides!

LHC status 2

Total integrated luminosity at 1.38 TeV

13-02-2013

3557 3558

35593556(500b)

ATLAS total now ~3.5 pb-1

LHC status 3

Last 24 hours

13-02-2013

3557 3558 3559

Abort gap high cleaning

effect

LHC status 4

Fill 3557

13-02-2013

Intensity ~ 1.2E11 p/bunch

Injection B1 then B2

Big losses on B1 at start of collisions

Peak lumi ~95E30

Improvement on lifetime (~5h) when trimming the octupoles down from 3.0 to 2.6 units in collisions

LHC status 5

Fill 3557

13-02-2013

Strong excitation visible on B1 and B2 around 0.29 (8 kHz line?) which becomes more pronounced when going into collision. The line is visible already

before and seems to be most pronounced in the vertical plane.

B1H B1V

B2H B2V

0.29 0.29

0.290.29

LHC status 6

Fill 3558

13-02-2013

Lifetime dip and losses improvedchanges wrt previous fill

• Some time spent at flat-top to wait for the tunes to stabilise• Alternating injection B1 and B2• Reduced landau octupoles strength on the second part of the

collision BP from 3 to 2.6 (~120 A to 100A)

Peak lumi ~140E30

LHC status 7

Fill 3558 - dump

13-02-2013

Alarms on RF: ACSModuleM1B1 : Crowbar Grid current (LV side) out of range. Else HV-RF specialist intervention required to check and in case replace crowbar.

ACSLine4B1: Main HV Power not at NominalACSLine1B1: Main HV Power not at NominalACSLine3B1: Main HV Power not at NominalACSLine2B1: Main HV Power not at Nominal-> The power converter is not delivering a minimal nominal voltage (set to 40kV). Power converter off or wrong voltage output. Measurement system faulty. Check power converter settings and acquisition with expert interface. In case call power converter piquet or access required.

At 15:15 beam dump due to trip of RF module M1B1

LHC status 8

Access – Tuesday evening

13-02-2013

Access was given to RF zone to fix the fault on M1B1 In parallel access for the MQK – a test was performed to

check the MKQ functionality During the access the patrol on PM45 sector 1 was lost – had

to be redone

LHC status 9

Fill 3559

13-02-2013

Octupoles strength further lowered while in stable beams down to 1 unit, then

trimmed back to 1.2

Big improvement on lifetime

Octupoles to 2 units

Abort gap cleaning ON

Octupoles to 1.2 units

AGC had to be switched ON continuously during the fill

Peak lumi ~155E30

LHC status 10

Plans

Refill for physics (beam unavailable from Booster this morning for 4

hours) This afternoon – VdM – INDIVs

Plus loss map Operational development Fill overnight to finish – RPs in to 13 sigma 06:00 Thursday – start quench test program

No ions

13-02-2013

LHC status 11

Roman pots - request

At the end of the upcoming 1400 bunch fill we briefly insert the pots to the validated position of 22 sigma, just as a necessary condition for proceeding further in the plan. I remind that last night's insertion to 22 sigma from the 500 bunch fill was without any problem.

At the end of a low-intensity fill, possibly the VdM fill, we insert the pots to 13 sigma (where we would have physics acceptance) and do a quick loss map at dumping time.

If this loss map is ok, we insert to 13 sigma in the remaining fills.

13-02-2013

Mario Deile

LHC status 12

Accesses

Accesses for quench test: Scope installation in IP6 (12L6). 2 hours. It has priority over Q6L8 scope

installation Fast measurement system on RQ6.L8 (30 min in the UA83 by Jaromir

Ludwig). Ramp to 300 A afterwards. Access for circuit tests – in the shadow

Change hardware limits on all Individual Powered Quads EPC, 2 hours during working hours

13-02-2013