20/01/09

OPERA general meeting NagoyaCNGS report

Expectations for 2008 (from collaboration meeting in June 08):

• nominal intensity for 2008 of 2x10E13 pot/extraction • 123 effective beam days from the SPS schedule;• super-cycle of 48 s (including LHC cycle), 80% efficiency, during day-time (50% of the time);• super-cycle 42 s (removed MD cycle) during the nights,

we would eventually expect ~2.28x1019 pot, ~120 interactions/week, ~2200 interactions integrated over the whole 2008 run.

2008 budget:

Intensity 2.0E13/extraction reached in August

First part of the run very inefficient due to many general problems occurred at the CERN machine complex

Recovered performance in October due to the LHC accident and semi-dedicated operation mode

Extraction 1

Extraction 2

2.0E13 pot

Beam loss, vacuum accident 27/6-2/7

2.0E13 pot

Fri 20/63 cycles

Unix Time

Unix Time

pot

pot

Wed 18/6 17:00Start of commissioning at low intensity

Long MD stop + MTE kicker problem7/7 6:00 – 10/7 12:00

10/7 21:00 Earth fault on the PSmagnet

PS magnet repairno beam until Fri 18/7 23:08

18KV cable accident25/7

PS septum + Long MD8-14/8

3/11 8:00

Horn filters

PS vacuum

CNGS quadrupole

MD Horn filters

60% average efficiency

Extraction 1 (pot)

Extraction 2 (pot)

Average intensity:1.75E13 pot

Average intensity:1.84E13 pot

CNGS distribution of the intensity per extraction during all the run

Super-cycle without MD

Semi-dedicated mode

1.782E19 pot

Beam loss, vacuum accident 27/6-2/7

Unix Time

pot

Wed 18/6 17:00Start of commissioning at low intensity

10/7-18/7 Earth fault on the PSmagnet

Long MD stop + MTE kicker problem7/7 6:00 – 10/7 12:00

3/11 8:00 1.782E19 pot

18KV cable accident25/7

PS septum + Long MD8-14/8

Horn + PS vacuumWeek 1/9

CNGS quadrupole14-17/9

6-8/10 MD

Horns filters19-20/10

Half of statistics in October

Past CERN performance for the running of the West Area Neutrino facility(Chorus+Nomad)

2008

Statistics:

Increase in the duty cycle since September 24th (suppression of LHC pilot cycle) further increas after November 6th (stop of north area) allowed to partially recover the bad performance since the beginning of the run, about1E19 pot collected during this last period .

Final numbers:

1.782E19 pot collected, corresponding to 10058 on time events and 1690 candidates in the bricks.Number of events expected with 1.762E19 pot (black outs removed) = 1700

Multi-turn extraction:

A necessary tool in order to achieve nominal beam performance

-Remove bottleneck due to beam losses at the extraction from the PS- Cleaner beam for SPS, less crytical tuning of the machine- Less radiation damage, less troubles, better efficiency

Under commissioning since the beginning of the runFirst extraction to SPS achieved on August 1st

MTE

Work not finished, to be continued next year (suffered a lot from low resources)

Tests perfomed even with CNGS beam at the end of the run, last day neutrinos sent to LNGS with 1.3E13 pots/extraction in one over five CNGS cycles

CT extraction not dismantled, will work in parallel still at the beginning of next year

Once MTE works it will be needed a robust effort to improve the PS performance, we have to make sure that there will be resources for that

Start May 14th

End November 23rd

What we learnt for 2009 ?

Average efficiency of 80% was achieved in the last part of the runIntensity of 2.0E19 achieved 2.4E19 to be demonstratedMTE work has to be finished ~couple of months then PS tuning has to be performed in order to increase the intensity

Expectations for 2009:

173 days48s supercycle80% efficiency2.4E13 pot/extraction

3.6E19 pot 3500 events