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

2. 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

3. Super Kamiokande is running extremely well.
2010b

5. 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.

6. 280m Calibration
Taken from the TPC NIM.

7. 2010a data inputs to Oscillation Analyses
CCQE m
CCQE m
CCQE e
Beam Prediction Tuned to NA61

8. (2010a)

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

10. 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

11. 280m Completion Summer 2010 (I)
Monte Carlo
Data !

12. 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

13. On to 2010b...

14. Machine Time History
Days
Scheduled
downtime
n allocation

15. Preliminary INGRID Results for 2010b

16. 280m OA 2010b data.

17. (2010a)

18. 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

19. 1000[kWx1E7s] Mid term goal By summer 2014 (4 seasons) 0.0137
Now
1000[kWx1E7s]
0.0137
1900kW.1E7s
LINAC 1 2 3 4

20. 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.

21. 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!