j-parc japan proton accelerator research complex · los alamos national laboratory . christine...

Sep 18, 2011 Shin'ya Sawada @ JPS Meeting, Hirosaki

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18pSL-6 FNALドレル・ヤン実験 SeaQuestの開始と展望

澤田真也，後藤雄二A，Florian SanftlB，柴田利明B，竹内信太郎B，竹谷篤A，中野健一B，宮坂翔

B，宮地義之C，他 SeaQuest Collaboration 高エネ研，理研A，東工大B，山形大C

FNAL = Fermi National Accelerator Laboratory, Fermilab


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内容

Fermilab E906/SeaQuest experiment Current status Schedule Possible statistics with the 1st beam Summary


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Fermilab Drell-Yan Experiments

(E605/772/789/866)

Open-aperture Closed-aperture Beam-dump (Cu)

J/Ψ J/Ψ

Ψ’

σ(J/ψ) ~ 15 MeV σ(J/ψ) ~ 150 MeV

σ(J/ψ) ~ 300 MeV

Meson East Spectrometer


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海クォークの構造：これまでの実験データ

pQCD – Gluon splitting? i.e. NMC (Gottfried Sum Rule)

NA51 (Drell-Yan)

E866 (Drell-Yan)

1

2 20

1

0

[( ( ) ( )) / ]

1 2 ( ( ) ( ))3 3

( )13 p p

p nG

p p

S F x F x x dx

u x d

i

x dx

f u d

= −

= −

= =

+

∫

∫

SG = 0.235 ± 0.026 Fittingの結果


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E906の目的・概要

目的：0.25 < x < 0.45 でdbar/ubarを測定し、より広い範囲でのdbar/ubarとそのx依存性を明らかにする。

陽子ビーム：FNAL Main Injector からの120GeVビーム – 2x1012/sec on target

スペクトロメータ:既存の資産を最大限生かしながら建設する。 – 日本グループはStation 3を主として

担当している。 – 17pSK-9 Commissioning Status of

the Drift Chamber for a Di-Muon Spectrometer at the E906/SeaQuest Experiment at Fermilab, Florian Sanftl 他

Tevatron 800 GeV

Main Injector 120 GeV


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FNAL SeaQuest Collaboration

Los Alamos National Laboratory

Christine Aidala, Gerry Garvey, Mike Leitch, Han Liu, Ming Xiong Liu, Pat McGaughey, Andrew Puckett

University of Maryland

Betsy Beise, Kaz Nakahara

University of Michigan Chiranjib Dutta, Wolfgang Lorenzon, Richard Raymond, Michael Steward

National Kaosiung Normal University

Rurngsheng Guo, Su-Yin Wang

University of New Mexico Imran Younus

RIKEN

Yoshinori Fukao, Yuji Goto, Yuji Taketani

Rutgers University Lamiaa El Fassi, Ron Gilman, Ron Ransome, Yawei Zhang

Thomas Jefferson National Accelerator Facility

Dave Gaskell, Patricia Solvignon

Tokyo Institute of Technology Shou Miyasaka, Ken-ichi Nakano, Florian Sanftl, Toshi-Aki Shibata, Shintaro

Takeuchi

Yamagata University Yoshiyuki Miyachi

Abilene Christian University Branden Bowen, Brianna Edlund, Tyler Hague, Donald Isenhower, Ben Miller,

Tim Sipos, Rusty Towell, Shon Watson

Academia Sinica Wen-Chen Chang, Jai-Ye Chen, Yen-Chu Chen, Shiu Shiuan-Hal, Da-Shung

Su

Argonne National Laboratory John Arrington, Kevin Bailey, Don Geesaman*, Kawtar Hafidi, Roy Holt,

Harold Jackson, Tom O’Connor, David Potterveld, Paul E. Reimer*, Josh Rubin

University of Colorado Ed Kinney, Po-Ju Lin

Fermi National Accelerator Laboratory

Chuck Brown, Dave Christian

University of Illinois Bryan Dannowitz, Markus Diefenthaler, Dan Jumper, Bryan “B.Z.” Kerns,

Naomi C.R Makins, R. Evan McClellan, Jen-Chieh Peng

KEK Shin'ya Sawada

Ling-Tung University

Ting-Hua Chang

*Co-Spokespersons

Solid Iron Magnet (focusing magnet,

hadron absorber and beam dump)

Station 1 (hodoscope array,

MWPC track.)

Station 4 (hodoscope array, prop tube track.)

Targets (liquid H2, D2,

and solid targets)

Drell-Yan Spectrometer for E-906/SeaQuest (25m)

Station 2 (hodoscope array,

drift chamber track.)

Station 3 (Hodoscope array, drift chamber track.)

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KTeV Magnet (Mom. Meas.)

Iron Wall (Hadron absorber)


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FNALPAC approval in 2001. But experiment was not scheduled due to concerns about “proton economics”

Spectrometer upgrade funded by DOE/Office of Nuclear Physics.

MOU was made in 2008, Fermilab PAC 2nd stage approval in 2008 Scheduled to run for 2 years in 2010, 2011 Data analysis will last for 3 years after the beamtime.

2008

2007

2010

Expt. Funded

2009 Magnet Design Experiment And construction Construction

Experiment Runs

Data Analysis

2011

History and Original E906 Time Line

Current Schedule

Proton beam has not come to the experiment yet. – Beam line construction by Fermilab was delayed. – Addition of shielding was required by a safety committee. – Vacuum leak is being repaired by an outside company:

critical path.


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8-Aug 15-Aug 22-Aug 29-Aug 5-Sep 12-Sep 19-Sep 26-Sep 3-Oct 10-Oct 17-Oct 24-Oct 31-Oct Preparation for Job and G2, NM1 cleanout Subcontractor Survey Mid America Underground & Fermilab Contracting Mid America Underground Installation of Dipole Dog Leg

Beam will come by November 1st. Two month commissioning can be assumed. At least three months for physics run until one-year

shutdown from the spring, 2012.

Spectrometer Readiness

Hodoscopes – Ready, waiting for the beam. – Need for initial commissioning.

Drift chambers – Great contribution from SeaQuest-J: Florian Sanftl, Shou

Miyasaka, Kenichi Nakano. – Old chambers have been repaired. – Noise reduction and readout test going on.

Target – Almost ready to be installed.

Magnets – Ready.


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Recent Scene


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Possible Statistics for the 1st Run

Assumptions – Instantaneous rate: Assume 4e11 protons/s (20% of

proposal rate) – Accelerator efficiency: 70% – Experiment efficiency:70%

With three month physics run (assuming Jan to Mar), 4e11/s*4 s*60*24*30*3 month*0.7*0.7= 10 e16

protons = 2% of MOU (between SeaQuest and Fremilab).

There is a possibility for the run to be extended till May (~two months gain).

Note that the full amount of the protons on target defined in the MOU will be delivered finally.


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Possible Physics Cases for Run 1

Drell-Yan dbar/ubar J/Psi dbar/ubar Drell-Yan N dep J/Psi N dep …


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Summary & Outlook

Preparation for E906/SeaQuest progresses. The experiment is ready for beam commissioning.

SeaQuest-J has great contribution especially for chamber construction, refurbishment, and readout.

Expecting the 1st beam in November, and three month physics run until March, 2012. – Two month extension may occur.

With three month physics run, 2% of the final goal of the statistics may be taken.

Even with the limited statistics, good physics output can be foreseen.

SeaQuest-J plans to construct a new Station 3 – chamber, which covers the lower half of the Station 3.

St.3- Chamber


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