Title: J-PARC and Dimuon Experiments
1J-PARC and Dimuon Experiments
- Shinya Sawada
- KEK
- (High Energy Accelerator Research Organization,
Japan)
2J-PARC Facility
- The budget for about 2/3 of the entire project
has been approved by the Japanese government from
JFY2001 as Phase 1. - Phase 1 (151 billion Yen) consists of major
accelerator components and a part of experimental
facilities.
3LINAC
RCS
n
MLF
50GeV-PS
Hd
Birds eye photo in Feb. 2008
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5Acceleration and Extraction at 3 GeV
500ns
Beam Current inside the Ring
Beams remain inside the ring for 20 ms.
Current
Beam Loss
Time
3NBT Beam Current (Extracted Beams)
Magnetic Field
3GeV
Current
20 ms
Injection at the minimum field and the extraction
at the maximum field
Beam Current Detected at 3NBT
Time
181MeV
Successful Acceleration and Extraction !!!
Acceleration
Injection
Extraction
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8Performance of the 50-GeV PS
Numbers in red are design values.
Numbers in parentheses are ones for the beginning
of Phase 1. Energy recovery of the linac to 400
MeV is planned just after the completion of the
Phase-1 construction in 2009.
- Beam Energy 50GeV ELinac 400MeV
- (30GeV for Slow Beam) ELinac (180MeV)
- (30GeV for Fast Beam)
- Repetition 3.4 5-6s
- Flat Top Width 0.7 2-3s
- Beam Intensity 3.3x1014ppp, 15mA
- (21014ppp, 9mA)
- Beam Power 750kW
- (270kW)
9Slow Extraction Beamline (Phase 1)
NP-HALL 56m(L)60m(W)
50-GeV PS
A-Line
Switch Yard
T1 Target 30 Loss
Split Point 2 Loss
T0 Target 0.5 Loss
Beam Dump 750kW
Plan to extend the hall downstream (50m) in the
Phase 2.
10Hadron Hall July 2007
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11Beamlines at the Hadron Hall
12Hadron Hall Today
13Hadron Experimental Hall (Phase I)
A-Line
Beam Dump
Extension in Phase II
56 m
14Oct.
Dec.
Neutrino
15Important Schedule
- May-June, 2008 Beam injection to the 50-GeV
synchrotron and trial of beam capture - Summer, 2008 Installation of slow extraction
equipments - December 2008 Acceleration up to 30 GeV and the
first slow extraction to the Hadron facility - December, 2008 February, 2009 First
experiments using slow extracted proton beam at
K1.8BR - April, 2009 First neutrino production
16Results of the 4th PAC (Jan 2008)
16
17 Measurement of High-Mass dimuon Production at
J-PARC (P-04)
Collaboration
Abilene Christian University, Argonne National
Laboratory, Duke University, High
Energy Accelerator Research Organization,
University of Illinois at Urbana-Champaign, Kyoto
University, Los Alamos National
Laboratory, Pusan National University, RIKEN,
Seoul National University, Tokyo Institute of
Technology, Tokyo University of
Science, Yamagata University
Collaboration members
J.K. Ahn, J. Chiba, Seonho Choi, D. Dutta, H.
Gao, Y. Goto, L.D. Isenhower, T. Iwata, S.
Kato,M.J. Leitch, M.X. Liu, P.L. McGaughey, J.C.
Peng, P. Reimer, M. Sadler, N. Saito, S.
Sawada,T.-A. Shibata, K.H. Tanaka, R. Towell,
H.Y. Yoshida
(Spokesperson S. Sawada and J. C. Peng)
18(A part of) Physics with Dimuon Measuremet at
J-PARC
19dbar/ubar at larger x
20PAC Message on P04
21Prospect and Relation with E906
- Major equipments of E906 will be shipped to
J-PARC after E906, in 2012? - Radiation especially of M1 be OK? Core part of
the beam dump can be built as a separate module? - Beamline for P04 has not been funded, and we
continue to make efforts. - The beam energy would be 30 GeV at the beginning
of the J-PARC experiments. - Physics cases even after E906 should be more
emphasized, such as spin related measurements
even without polarized beam and/or target. - Discussion on responsibilities of P04 and
modified P24 would be important.
22Polarized Proton Acceleration at J-PARC (P24)
23Status of P24
- PAC
- No decision yet.
- Although the PAC recognizes that polarized beam
acceleration in the MR can be one of the future
options in J-PARC, judgement of the technical
feasibility of this proposal is beyond the
present PACs scope - The PAC would like to hear a separate proposal
with more specific discussion of the physics and
proposed measurements - Revised P24 (or another number), with physics
emphasis, will be submitted to the next PAC
meeting (October 2008).
24Hadron hall Users Association
- Hadron hall Users Association HUA was
founded in March, 2007. - Now the Chair of HUA is a member of J-PARC Users
Steering Committee - Send email to hua-sec_at_rcnp.osaka-u.ac.jp to join.
25 Users Steering Committee
- New members were elected in November of 2007.
- Representatives from four communities are
included. - Roadmap of the future J-PARC will be discussed at
this committee. - Discussion items by this committee were
re-identified. - The committee will start intense discussions from
February about future plans of the J-PARC.
Phase 2 for J-PARC will be discussed first at
this Committee
26Summary
- J-PARC has achieved 3-GeV beams at RCS and the
50-GeV synchrotron already. - The first 30-GeV slow extracted beam is expected
around the end of this year. - Our proposals, P04 for unpol. dimuon measurement
and P24 for pol. proton acceleration with
experiments, are deferred. - HUA has been founded. Your participation is very
much welcome.