Current Status of the T2K Experiment JPARC PAC Jan. 14th, 2011 Dave Wark Imperial/RAL

n beam JPARC Accelerators Super Kamiokande Neutrino Beamline Goals of the T2K Experiment: Build the world’s most intense n beam. Perform the world’s most accurate measurement of nm disappearance. Perform the world’s most sensitive search for ne appearance – measure q13! Near n detectors

Super Kamiokande is running extremely well. 2010b

Beam Delivery during 2010a Period (Jan-June 2010) 3.3 x 1019 (~15.5 kW x 107 s) Total delivered p.o.t. ~ 1/6 planned, but enough to begin n measurements.

280m Calibration Taken from the TPC NIM.

2010a data inputs to Oscillation Analyses CCQE m CCQE m CCQE e Beam Prediction Tuned to NA61

(2010a)

SK events Super Kamiokande Beam Events Two-ring event Single-ring m-like event Two-ring event

2010a oscillation results soon... Two groups doing Preliminary each N1Rm NSK for 2010a 2010a oscillation results soon... ne appearance nm disappearance Two groups doing each analysis – they agree! Preliminary

280m Completion Summer 2010 (I) Monte Carlo Data !

Full ECAL Installed! 280m Completion Summer 2010 (II) 22301/22336 channels live Magnet Electricity Supply upgraded, now capable of running at (above) nominal 0.2T field

On to 2010b...

Machine Time History Days Scheduled downtime n allocation

Preliminary INGRID Results for 2010b

280m OA 2010b data.

(2010a)

Delivered POT v.s. goal If we continue running at 115 kW it is Removing beam tuning / study, Calibration of CT “Good spill” = 4.061019 POT SK DAQ efficiency=99.9% (Run29~34 Delivered= 3.351019, “Good spill”=3.261019) If we continue running at 115 kW it is clear we will not achieve 150 kW x 107 s Assuming * Apr for HD * May 1st~ for NU

1000[kWx1E7s] Mid term goal By summer 2014 (4 seasons) 0.0137 Now 1000[kWx1E7s] 0.0137 1900kW.1E7s LINAC 1 2 3 4

Conclusions (I) Construction is finished! The neutrino beamline has worked beautifully with ~95% reliability. All near detectors are now working and ready for more data. Super Kamiokande continues to run stably with extremely high efficiency. Much effort has gone into tools which now allow for rapid reduction and analysis of the data. We will be announcing our first physics results and publishing our first physics papers in a few months.

Conclusions (II) The accelerator group and the high-power task force have worked extremely hard to increase our available protons on target and have made many improvements, for which we are very grateful. We will need continuing improvements to keep ahead of our international competition: if q13 is large we face near-term competition from MINOS, OPERA, and Double-Chooz; and if it is small we face mid-term competition from NOvA and Daya Bay. Continued running at 115 kW will not achieve 150 kW x 107 seconds before the run ends in June. We therefore need the problem with the injection kicker solved as quickly as possible (see Koseki-san’s talk). After that, we would like to quickly see further high-power tests to see where the next problem lies. As the situation with the accelerators develops, and we see what results come from the experiment, we hope that the accelerator development programme can be optimized to keep us in the world lead (could one consider delaying the Linac upgrade?). We hope that every effort will be expended to maximize our integrated p.o.t during each calendar year!