1. Status of J-PARC,KEK, and Super-KEKB
KEK, High Energy Accelerator
Research Organization
Status of J-PARC,KEK, and Super-KEKB
Yasuhiro Okada
June 19, 2010
FALC Meeting, CERN

2. J-PARC Neutrino to Kamioka 500 m Joint Project between KEK and JAEA
Hadron Beam Facility
Materials and Life Science
Experimental Facility
Main Ring
(>0.75 MW)
500 m
Nuclear Transmutation
Neutrino to Kamioka
3 GeV Synchrotron
(25 Hz, 1MW)
Linac
(350m)
Facility for material-Life science (MLF) and Nuclear-Particle science
Consists of LINAC, Rapid Cylcling Synchrotron (RCS), and Main Ring
MR has two extractions; fast and slow
Joint Project between KEK and JAEA

3. T2K (Tokai to Kamioka) experiment
~500 members, 62 Institutes, 12 countries
High intensity nm beam from J-PARC MR to 295km
Discovery of ne app.  Determine q13
Last unknown mixing angle
Critical key to realize experiments to explore CPV in lepton sector
Precise meas. of nm disapp.  q23, Dm232
Really maximum mixing? Any symmetry? Any unexpected?
sinq12~0.5, sinq23~0.7, sinq13<0.2)

4. Milestones
1999: Nishikawa&Totsuka proposed to measure ne appearance as a next critical step toward CP measurement
2001: “The JHF-Kamioka Neutrino Project” report published
April 2004:
Officially approved by Japanese Government and 5yr Construction started
T2K international collaboration officially formed
March 2009: Construction completed as scheduled
April 23, 2009: First neutrino beam production and commissioning started
January 2010: Data taking for oscillation search started!
Feb. 24, 2010: First SuperKamiokande Event!

5. Started data taking for oscillation!
70kW
50kW
(2010)
Delivered # of protons: 2.34×1019 (Jan-May)
Continuous ~50kW level
Trial upto 100kW done

6. Observed SK events Event time distribution clearly show beam structureFC FC OD LE
Event time distribution clearly show beam structure
Observed # of Fully contained events: 22
Expected non-beam BG: <10-3evts

7. SK events Single-ring m-like event Two-ring event
Pink diamonds are placed on the wall in the beam direction starting from the reconstructed vertex.

8. Beam Lines & Experiments Ready at Hadron Hall
KL Rare Decay
K0Ｌ→ π0 ν ν
High Resolution Spectroscopy
Q+ via p(p-, K-) reaction
K0L→p+p-p0 d u s
Pentaquark Q+
K1.8
Strangeness Nuclear Matter KL
K1.8BR
K1.1
High momentum
kkp, phi, hyper, penta
K1.1BR
kaonic nuclei via stopped K-
for Test Experiments
FM Magnet is ready! 8

9. J-PARC/MLF NNRI iBIX S-HRPD NOP DNA NOBORU HRC PLANET TAIKAN 4SEASONS
12 neutron science instruments have already been constructed and additional 3 instruments are under construction. Construction of 3 instruments will start soon:
J-PARC/MLF
NNRI
Temperature dependence of the precise bondlengths l(Ru-O) was obtained at BL08.
iBIX
NOP
S-HRPD
NOBORU
DNA
HRC
PLANET
Multi-Ei measurement have been demonstrated for the first time (Nakamura et al., JPSJ )
TAIKAN
4SEASONS
AMATERAS
NOVA
ARISA-II
TAKUMI
Small amount of high-pressure-synthesized sample can now be used for structure solution. FeAs superconductor was studied with only 0.05 cc at BL08.
Structure of the polymer/water interface could be observed within 2 hours.
iMATERIA

10. J-PARC MUSE (Muon Science Establishment)
µSR
The world-most intense pulsed muon beam has been achieved at the proton power of 120 kW (since Novemebr 2009).
Muon source
Number of µ+/pulse
J-PARC MUSE
RAL ISIS (U.K.)
The first result from J-PARC: Insular superconductivity in Co-doped Iron-pnictides
CaFe1-xCoxAsF
J-PARC data
Inside the matter
Superconducting phase develops only around Co atoms (blue dots). Ca
Fe,Co
SC phase
Mag. phase
S. Takeshita et al., Phys. Rev. Lett. 103, (2009).
Domain size ~1 nm

11. KEKB and Belle

12. Achievement of the B Factories
Discovery of CP violation in BB system
Belle, July 05
B0J/yKS
B0J/yKS
Confirmation of KM mechanism
PDG2008

13. Possible hints for NP? SM Difference in CPV between B0 and B±
Anomalous CPV in b→s processes?
Anomaly in B→K*ll decay? SM
Inconsistency in unitarity triangle?
Unexpectedly large D0D0 oscillation
Theoretical calculations
using Vub, Dmd,eK
Direct
measurement

14. SuperKEKB x 40 Gain in Luminosity e- 2.3 A
Colliding bunches
Belle II
New IR
e- 2.3 A
New superconducting /permanent final focusing quads near the IP
SuperKEKB
New beam pipe
& bellows
e+ 4.0 A
Replace long TRISTAN dipoles with shorter ones (HER)
Add / modify RF systems for higher beam current
Low emittance positrons to inject
Positron source
Redesign the HER arcs to squeeze the emittance
Damping ring
New positron target / capture section
Low emittance gun
TiN-coated beam pipe with antechambers
Low emittance electrons to inject
x 40 Gain in Luminosity

15. Luminosity projection
50 /ab
1.2 /ab/month
(8 x1035 /cm^2/s)
0.9 /ab/month
(6 x1035 /cm^2/s)
計画の予定について述べる。
KEKB/Belle実験の運転は今年度一杯で終了し、3年間のシャットダウン期間で、加速器と測定器のアップグレードを行う。新しい実験を2013年にスタートし、3年程度で10ab-1蓄積を目指す。目標とする8x10^35のルミノシティーが達成されれば、2020年頃までに50ab-1の蓄積が可能である。
H26
0.6 /ab/month
(4 x1035 /cm^2/s)
Shutdown
for Upgrade
Learning Curve

16. Belle-II Collaboration has been formed
SuperKEKB LoI
KEK Roadmap
st Proto collaboration meeting
Detector study report
New collaboration, Belle-II, started
~300 collaborators from 43 institutions in 13 countries
~ th open collaboration meetings

17. Summary J-PARC commissioning is under way.
Data taking for the T2K experiment has started.
Charged and neutral Kaons are observed for experiments at Hadron Hall.
Neutron and muon beams are delivered for users at Materials and Life Science Facility (MFL).
We are ready for Super-KEKB and Belle-II.