June 20, 2008Shin'ya Sawada @ Fermilab E9061 J-PARC and Dimuon Experiments Shin’ya Sawada KEK (High Energy Accelerator Research Organization, Japan)

June 20, 2008 Shin'ya Sawada @ Fermilab E906 1

J-PARC and Dimuon Experiments

Shin’ya Sawada

KEK (High Energy Accelerator Research Organization, Japan)


J-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.


ＭＬＦ

RCS

ＬＩ

ＮＡ

Ｃ

50GeV-PS

HdBird’s eye photo in Feb. 2008


3 GeV

Linac

Materials & LifeExperimental Hall

Hadron Experimental Hall

NeutrinoTargetArea


MagneticField

Beam Current inside the Ring

Injection Extraction

Acceleration

Acceleration and Extraction at 3 GeV2007.10.31.14h03m23s

Current

181MeV

3GeV

20 ms

Injection at the minimum field and the extraction at the maximum field

Beams remain inside the ring for 20 ms.

Beam Loss

3NBT Beam Current（ Extracted Beams)

Time

Beam Current Detected at 3NBT

Successful Acceleration and Extraction !!!

500ns

Time

Current




Performance of the 50-GeV PS

Beam Energy ： 50 ＧｅＶ 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, 15A

(2×1014ppp, 9A) Beam Power: 750kW

(270kW)

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.


Slow Extraction Beamline (Phase 1)

NP-HALL56m(L)×60m(W)

50-GeV PS

T1 Target

30% LossBeam Dump

750kW

Switch Yard A-Line

T0 Target

0.5% Loss

Split Point

2% Loss

Plan to extend the hall downstream (~50m) in the Phase 2.


Hadron Hall July 2007

コンクリート躯体の中には鉄遮蔽体が埋め込まれています


Beamlines at the Hadron Hall


Hadron Hall Today


Hadron Experimental Hall (Phase I)

Beam Dump

A-Line

56 mExtensionin Phase II


Oct.

Dec.

Neutrino


Important 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


Results of the 4th PAC (Jan 2008)


Measurement of High-Mass dimuon Production at J-PARC (P-04)

CollaborationAbilene 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

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

Collaboration members

(Spokesperson: S. Sawada and J. C. Peng)


(A part of) Physics with Dimuon Measuremet at J-PARC

Drell-Yan (at 50 GeV):

/ flavor asymmetry at large

Antiquark distributions in nuclei

Quark ene

/ Production (at 30 or 50 GeV):

/ nuclear depend

rgy

S

loss

ence

/ via / production

in nuclei

d u

d u J

x

J

J

pin physics with dimuons (mostly with polarized beam/target):

Drell-Yan with polarized beam/target

(Sea-quark polarizations, transversity, Sivers function)

/ with polarized beam/target

(Quark p

J

olarization, transversity, Sivers function)

Unpolarized Drell-Yan decay angular distributions

(Boer-Mulder's distribution function)


dbar/ubar at larger x

1 21 2

1 at fixed ,DYd

x xdx dx s

DY cross section is 16 times larger at 50 GeV than at 800 GeV

2 2

12

50-cm long / targets

10 protons per spill (3 s)

60-day runs

assuming 50% efficienc

for each t

y

argets

LH LD

D-Y at 50GeV also

directly measure at large

p p

u x


PAC Message on P04


Prospect 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.


Polarized Proton Acceleration at J-PARC (P24)


Status 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 PAC’s 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).


Hadron 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 [email protected] to join.


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


Summary

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.

Documents

June 20, 2008Shin'ya Sawada @ Fermilab E9061 J-PARC and Dimuon Experiments Shin’ya Sawada KEK (High Energy Accelerator Research Organization, Japan)