Report from ν-TAC - KEKT.Kobayashi (KEK) J-PARC NPFC Feb. 16, 2004 6 Q5P V2 PQ 2A PQ 4A PH 3 P 4B...

Feb. 16, 2004J-PARC NPFC 1T.Kobayashi (KEK)

Report from Report from νν--TACTACw/ recent status of neutrino facilityw/ recent status of neutrino facility

Takashi Kobayashi (KEK)

Nov.16,2003NPFC@KEK

1. Recent events (what’s new)2. Overview of facility3. Status of Design and R&D of each component4. Summary (Executive summary as conclusion)


•• Nov.12,13, 2003Nov.12,13, 2003ν-TAC (technical advisory committee)

•• Dec.20,2004Dec.20,2004– Neutrino project on the draft budget from

MOF. APPROVED!APPROVED!• 5 years project from JFY2004 ~ JFY2008• First year ~ 6oku¥ (total 159.6oku¥)• Beam line + near det. @ 280m (w/o 2km det.)• Start experiment in 2009

•• Jan. 27, 2004Jan. 27, 2004ν-TAC report is submitted.

Recent eventsRecent events


νν--TACTAC


Committee Members & ProgramCommittee Members & Program

2. Committee members Ewart Blackmore Head of Accelerator Technology

Division, TRIUMF General (incl. proton beam monitor, remote handling)

Konrad Elsener Project leader of CNGS (CERN Neutrinos to Gran Sasso), CERN

Target station, Decay pipe, Beam dump

Kenji Hosoyama Professor, Accelerator Laboratory, KEK (Responsible person for cryogenics for KEK-B SC RF cavity)

Cryogenics

James Hylen Leader of Neutrino Beam Devices group in NuMI Project, FNAL

Target, horn, target staion

Takahiko Kondo Head of Phys. Div. II, Institute for Particle and Nuclear Studies, KEK (Group leader of ATLAS-Japan)

Neutrino beam

Katsunobu Oide Head of Acc. Div. II, Accelerator Laboratory, KEK (Leader of commissioning group of KEK-B)

Proton beam optics

James Strait US LHC Accelerator Project Manager, Technical Division, FNAL

Superconducting magnets

Kiyosumi Tsuchiya Professor, Cryogenic Science Center, KEK (Responsible person for QCS for KEK-B and TRISTAN)

Superconducting magnets

8:50 9:10 0:209:10 9:30 0:20 Opening remark & status of J-PARC S.Nagamiya

9:30 10:00 0:30Status of J-PARC Kamioka neutrino experiment(Including organization for const., operation,maintenance, budget request, status of experiment

K.Nakamura

10:00 10:20 0:20 Overview of neutrino facility (including organization inneutrino facility group) T.Kobayashi

10:20 10:40 0:2010:40 11:10 0:30 Status of 50-GeV PS and R&D of fast extraction system S.Machida

11:10 11:55 0:45 Optics A.K.Ichikawa11:55 12:25 0:30 Normal conducting magnets incl. maintenance system E.Hirose12:25 13:55 1:3013:55 14:55 1:00 Superconducting magnets T.Ogitsu14:55 15:15 0:20 Cryogenics Y.Makida15:15 15:30 0:15 Vacuum & window system T.Ishii15:30 16:10 0:40 Primary proton beam monitors M.Iwasaki16:10 16:30 0:20

16:30 17:00 0:30 Neutrino beam optimization(target, horn, dv,..) A.K.Ichikawa17:00 17:30 0:30 Target Y.Hayato17:30 18:00 0:30 Horn development A.K.Ichikawa18:00 18:15 0:15 Horn power supply Y.Suzuki19:00 21:00 2:00

9:00 9:30 0:30 Target station Y.Yamada9:30 10:00 0:30 Decay volume M.Sakuda

10:00 10:40 0:40 Beam dump & muon monitor T.Ishida10:40 11:00 0:20 Near & medium neutrino detectors T.Nakaya11:00 11:20 0:20

11:20 11:40 0:20 Survey and alignment T.Ishii11:40 12:20 0:40 Radiation safety Y.Oyama12:20 12:35 0:15 Control & monitoring & DAQ system Y.Hayato12:35 12:50 0:15 Summary (Schedule, budget) T.Kobayashi12:50 14:20 1:3014:20

Party @ KEK restaurant

Note: the allocated time includes discussion of about 5min.

Seminar hall, 1st floor, 4th building, KEK

Seminar hall, 1st floor, 4th building, KEK

Closed session for discussion

Nov. 13 (Thr)

Coffee break

Lunch

Common

Closed session for introduction

ν-TAC programNov. 12 (Wed)

Primary proton beam line

Neutrino beam production

Coffee break

Lunch

Coffee break

Chair


OverviewOverview


PV2PQ5

PQ2A

PQ4A

PH3 PQ4BPQ3B

PV1PD21.92 deg. bend

PQ3APQ2B PH1

1.9 2 deg. bend

PQ1

PD1 PH2

コン

プレ

ッサ

ー室

冷凍

機室

カー

ドル

置場

液体

窒素

タン

ク

バッファタンク

電気

室

NM1低温棟

5,800l/min(低温設備)　980l/min(磁石電源)

NM2

ヤード

~4,500l/min(磁石汚染)

トンネル空調TS換気

電気

ヤー

ド

機械ヤード

冷却棟

4%slope

保安林伐採エリア

ＮＤ１

ＮＤ２

μピ

ット

1鉄

置場

μピット

測定室

電源ヤード

DQ2

DD2

Horn1

DD1

DQ1

DD3

DQ3 DQ4

Horn2

電源室

シャ

ッタ

ー

電気室

DSV DSH

サブトンネルA

サブトンネルB

サブ

トンネ

ルC

サブ

トン

ネル

D

輸送道路レベルTP+9.3ｍへ。

土盛り上面はTP+10.8ｍ保存するため法面発生。

ニュートリノ建屋を輸送道路側へ３ｍ、８間道路から

離れる方向へ５ｍ移動。（０２０２０７小林隆）

建屋壁面より５ｍ離れたところまで保安林伐採。

伐採面積計：０．286ｈａSM1 ST1

SM2ST2

ST3 ST4

UD1

UQ3

UQ1 UQ2

UV1 UV2

UH3

UH2

UQ4電源棟UQ5

UD2 UH1

制御室

出入管理

WC

WC

適当

な広

さ

37.5

m4%

slope

放射

化物

保管

室

2.4 3.63.03.6 2.4

13.5

μピ

ット１

3.0

20.0

6.6

3.0

6.6

30.0

5.65.6

3.0

4.64.6

4.57.0

3.5

15.0

5.0 5.0 5.0 μピ

ット２

2 .50

2 .00

8.00

4.00

2 .50

1.50

3.00

3.50

1. 50 1.5 0

2.00

3. 50

60.0

130.0

25,000

decay pipe

Near detector

TargetStation

µ-pit280m

130m

3NBT

Neutrino beam facility OverviewNeutrino beam facility OverviewSpecial FeaturesSpecial Features

Superconducting magnetsOff-axis beam

ComponentsComponentsPrimary proton beam line

Normal conducting magnetsSuperconducting arcProton beam monitors

Target/Horn systemDecay pipe (130m)

cross w/ 3NBTCover OA angle 2~3 deg.

Beam dumpmuon monitorsNear neutrino detector


ビーム振り下げ

FH1F

Q1

PD11.92 deg. bend

PC4PQ5 PH3

PC3 PQ3PQ4

PV2PC2 PC1

1.92 deg. bend

PD2PV1

引き出し基準点x=49615028.58, y=69561283.94

ニュートリノ・ビームライン

PQ2A PQ1

PH1PH2

サスペンション型

クレーン(20t x 2)

FV2

FQ4

FV1

FQ3

FH2

FV2

FQ2

Primary beam linePrimary beam line

Preparation sectionNormal conducting

Arc Section (R=105m)SuperconductingSuperconducting combined functioncombined function magnets

•First application in the world•Reduce cost (40 28mags) comp. w/ sep. func.•Larger acceptance

Final Focusing SectionNormal conducting

• Single turn fast extraction• 8 bunches/~5µs• 3.3x1014proton/pulse• 3.94 (3.64) sec cycle

– (depend on abort scenario)ε=6π mm.mr, ∆p/p=0.31% @50GeV ε=7.5π mm.mr, ∆p/p=0.36% @30GeV

• Total bending = 84.5o


FQ4

FQ3B

FQ3A

FH2

FV2

FV1

ビーム振り下げ

FQ2 B

F Q2 A

FH1

FQ1

PQ4BPH3

PV2PQ5

PV1 PQ3BPQ4A 1.92 deg. bend

PQ2B

PD2PQ3APD1

PQ1

1.92 deg. bend

PQ2A

ニュートリノ・ビームライン

PH1PH2

サスペンション型

クレーン(20t x 2)

• No way to know absolute beam loss

• Assumed by HAND • 1W/m to assure hands on

maintenance (arc sect).– Below quench limit.

• Shielding design based on the assumption

• Same order as KEK-PS beam line• ~102 relative

suppression!! Challenging

Fast ext.(kicker, septum)1.125kW (0.15%)

Preparation section(ctrl’ed loss by collimator)

0.75kW (0.1%)

50GeV ring0.5W/m

Final Focusing section0.25kW (0.03%)

Beam LossBeam Loss


OpticsOptics

beam

Arc section

Prep. section

Well Matched w/ Arc

collimators

~1cmArc section

Monitorshorizontalvertical

15mm @ target

Upstream part

Ichikawa, Tanabe, Iwamotow/ help Doornbos, Noumi, Oide

downstream part

6πmm.mr

• Optics design/optimization finished (Ichikawa)– 28 combined function SC magnets in arc.– >200π mm.mrad acceptance at arc– 60π at prep. and focusing sections

• Collimator optimization going (Tanabe, Ichikawa)– Minimize beam loss/heat load at superconducting arc– Baseline design (dimensions) determined

• Alignment tolerance & field quality under studies (Iwamoto, Ichikawa)


Recommendations: OpticsRecommendations: Optics• The design of the beam optics of the proton beam line looks

quite reasonable, showing that the use of combined function magnets is quite feasible. No fatal flaw or difficulties were found in the design.

• There should be better interaction between the 50 GeV main ring group and the neutrino facility design group to specify the extracted beam emittance and expected profiles (beam tails, halos etc).

• The tolerances of the beam parameters (orbit, Twiss, etc.) at the target must be specified considering the neutrino performance, the heating of the target and the dump by the proton component, etc. A strategy of the orbit/optics correction must be shown to achieve such tolerances under possible machine errors including errors in the ring.


Superconducting Superconducting magnetsmagnets


Coil

Iron yoke

Plastic collarCorrector

Magnet Cryostat

Current：~7000ADipole field ：2.6T x 3.3mQuadrupole：18.6T/m Precision: 10-3@5cmTotal 28 mags(14cell) Quench margin ~70%

Share parts w/ LHC mags.Reduce cost

Magnet and cryostat designMagnet and cryostat designCryo.Sci.C, KEK


Development of Superconducting magnetsDevelopment of Superconducting magnets

Test winding of a coil

Cryo.Sci.C. KEK


with full magnets

with half magnetsCommission

InstallAssembleTRT etc.

InstallPurchasePS etcInstallPurchaseCryogenics

68Mag. Install3553Cryostat2111181Magnet

20082007200620052004FY

ScheduleSchedule

Construction

R&DR&D• Short Mechanical Model Test ~Mar.04• Prototype Winding Apr.04• Prototype Test Jun.04


Recommendations: Superconducting Recommendations: Superconducting magnetsmagnets

• Build and test the prototype as soon as possible, which contains sufficient instrumentation to be able to determine the cause of any performance issues.

• Make a plan that will allow rapid construction of a second prototype, if necessary, that includes design modifications that address problems found in the first prototype.

• Do the beam studies necessary to determine the required set of correction magnets and prototype them as early as possible.

• As part of a study of the overall beam vacuum system, consider eliminating the inner beam tubeand using the cold bore tube as the beam tube.


CryogenicsCryogenics


2. Heat Load 2. Heat Load -- SummarySummary

• Magnet 22W/cryostat×14sets = 308W (+α Beam Pipe)• Transfer lines 300W <main tunnel> + 80W <sub tunnel>

= 380W• Beam halo 150m×1W/m = 150W• Control valves 3W×3sets = 9W• Current leads 1g/sec (8kA)×1pair = 1g/sec

= 30ℓ/hr(LHe) = 90W• Thermal anchor & shield 46W×14sets = 644W <magnet>

110W+300W = 410W <transfer line>644W <mag.>+410W<T.L> = 1054W

Total thermal load Refrigeration Capacity937W @4.5K 1.5 kW refrigeration @ 4.5K w/o LN2

2.0 kW refrigeration @ 4.5K w/ LN2 1054W @80K 1.5 kW @ 80K

Y.Makida (Cryo. G, IPNS, KEK)


Col

d Bo

x

Purif

ier

10m

UH1

UQ3UQ2UQ1

ST2SM1 ST1

UQ5 UH3

UH2

UQ4

ST4ST3

SM2

UD1UV2UV1

UD2

Buffe

r Tan

k

Buffe

r Tan

k

Evac

uatio

nPu

mp

Power Supplies

Utilities

Mai

n C

ompr

esso

r

Oil

Sepa

rato

rUtilitiy Yard

Que

nch

Buffe

r

Que

nch

Buffe

rPower Utilities

Tube

Tra

iler

Gas

War

mer

LN2

Tank

ＰＳ

Max Refrigeration:2.0kWMax Liquefaction : 800ℓ/hLHe pot : 2000ℓ

Max Compression : 800kW, 1.8MPa, 200g/s

Gas Tank (for CMP)Volume 100m3×2

Gas Tank (for Quench)Volume 100m3×2

LN2:30000 ℓ4000 ℓ/day (12000 ℓ/day @ pre-cooling)

Gas Tank (for Quench)Volume 100m3×2

Magnet / Transfer TubeVolume 1300ℓ, Mass200ton(Fe)

Specification of cryogenic componentsSpecification of cryogenic components


Recommendations: CryogenicsRecommendations: Cryogenics

• The heat load as calculated appears to be very conservative. More effort should be made to reduce the heart load and therefore the size and cost of the refrigeration system.


Normal Normal conducting conducting

magnetsmagnets


Summary of specifications of normal Summary of specifications of normal conducting magnetsconducting magnets E.Hirose (Kusano)

(5)(0)(5)(MIC)

20812Total

794Total2(H)3(H)+2(V)Steer.

42(V)Focusing52(H)Prep.Quad.Dipole

0

1

2

3

4

5[X106]

Abs

orbe

d D

ose

[Gly

/400

0hou

r]

PH1

PH2

PQ1

PQ2

PDA

PDB

PV1

PC1

PC2

PQ3

PV2

PC3

PQ4

PC4

PH3

PQ5

average in 5cm thickness

(Tanabe)MIC

• Magnet design using FEM are done

• Dose >1MGy/yr MIC

• Other magnets Polyimide insulated

Exp’ed radiation dosePreparation Section

Focusing Section


空調ダクト

300

700

5000

600

1000

900

7000

?250

Cross section of the normal Cross section of the normal conduction magnet tunnelconduction magnet tunnel

E.Hirose

Remote control hook

Remote&quickalignment mechanism

Quick water connector


Recommendations: Normal conducting Recommendations: Normal conducting magnetsmagnets

• The number of beam line magnets that have to be made radiation hard should be carefully assessed after better knowledge of beam halos is obtained from the accelerator group and included in the optics design.


Beam Beam monitorsmonitors

Feb. 16, 2004 J-PARC NPFC 26

Current status of the Beam Monitor R&D

Position Loop-Pickup monitor (LPM)J.Kameda, H.NoumiPlaced a prototype at the K2K beam-line

Profile Segmented Secondary Emission Monitor (SSEM)K.Tanabe, Y.Yamanoi, M.Iwasaki, H.AiharaPlaced a prototype at the K2K beam-dump.

Residual Gas Beam Profile Monitor (RGBPM)R.Ishida, M.Iwasaki, H.Aihara, Y.SatoInstalled a prototype in the steering magnet at the K2K beam-line.

Intensity Current Transformer (CT)(J. Kameda, M. Ieiri:K2K experience)

Interlock Beam Loss Monitor (BLM)Y.SatoInstalled prototype monitors at the K2K beamline

U.Tokyo(M.Iwasaki, et.al.)T&M group @ KEK IPNS (Noumi)


Beam test at the K2K beam dump

10-6Torr

K. Tanabe (U.Tokyo) et.al.

Cathode Ti strip(5µmt 2mmw)

R&D of proton beam monitorsR&D of proton beam monitorsSegmented Secondary Emission Monitor (SSEM):

Profile w/ diff. beam position


Recommendations: Beam monitorsRecommendations: Beam monitors

• The group should try to make use of existing monitor designs wherever possible.

• There should be careful engineering of the monitors that must be installed in the high radiation areas for reliability and serviceability.


VacuumVacuum


PV2PQ5

PQ2A

PQ4A

PH3 PQ4BPQ3B

PV1PD21. 92 de g. bend

PQ3APQ2B PH1

1. 92 de g. bend

PQ1

PD1 PH2

サブトンネルA

サブトンネルB

サブ

トンネ

ルC

サブ

トン

ネル

D

放射

化物

保管

室

60.0

Preparation Section (PS)

ARC Section

Final Focusing Section (FF)

Target Station (TS)

PS vacuum window (?)

50GeV ring

Emergency valve15m

Overview of vacuum systemOverview of vacuum systemIshii

<10-4Pa

• 50GeV-PS: 10-6Pa• <10-1Pa to control beam

loss• Arc: <10-4Pa (cryo.

pumping)• Window or diff. pumping

at prep. sect.


Recommendations: VacuumRecommendations: Vacuum

• The baseline design should be made with no vacuum window separating the main ring from the proton beam line. This reduces potential beam spill loss into beam line components and makes it unnecessary to carefully monitor the beam size at this window location.


Overview of target areaOverview of target area33m

Iron shield

Concrete blocks

Target & 1st horn

Beam window

2nd horn 3rd horn

Final focus

Decay volume

Concrete structure

Beam window?

Ground level

Baffle

• Target– 20kW (60kJ/pulse)

load– Graphite– 3cmφ x 90cm– Water or He gas

cooled• Horns

– 3 horn– 320kA pulsed

current– Water cooled

• Baffle– protect horn from

mis-steered beam• All placed in He

vessel– Reduce 3H and NOx


Target Target StationStation


Target stationTarget station• In conceptual design phase• Highly radio-activated everywhere• Target area filled w/ Helium reduce NOx/3H production• 20cm thick Al for inner wall Reduce residual dose by factor ~10• Remote maintenance (open ceiling)

Iron shield

Helium vessel

Machine room

Service pit

Sto

rage fo

r hig

hly

activ

ate

d s

tuff

Iron shield

Concrete block

Target/1st horn

Beam window

2nd horn 3rd horn

Final focus

Decay volume

Built-in concrete

Beam window

Baffle

22m 33m

11m40ton crane

GL

Y.Yamada


Recommendations: Target StationRecommendations: Target Station

• Check possible effect of enhanced horn electrical breakdown from the use of helium atmosphere.

• Make a layout in the machine room of all of the equipment that will be needed to determine if there is enough space.


TargetTarget


Target R&DTarget R&D• Cooling

– Water or He gas cooling– FEM (& analytical) calc. max.

T=~240deg w/ water cooling.– Cooling test underway.

• Thermal stress– FEM analysis– Max. stress 6.8MPa (safety fact.

3~4 available.)• Radiation damage• And so on,..

Target temperature vs time (α=6kW/m2/K)Example of FEM (by T.Nakadaira)

Water cooling testWater cooling testHeat load by DCConfirmed 20kW can be removed Confirmed 20kW can be removed

by direct water coolingby direct water cooling

Target in water pipe

Hayato, Nakadaira, Ichikawa, ..Target&Monitor G.(Noumi)


Recommendations: TargetRecommendations: Target

• Determine whether the target water jacket also needs to be protected by the baffle and whether the baffle needs to be water-cooled.


HornHorn


100 cm100 cm

900472

2500

1400

2000

809

Horn statusHorn status

Target

φφνµνµ

Arb

. Uni

t.

Ichikawa

• Optimization of magnetic field configuration finished– 320kA x 3 horns– Optimized to the level of ideal

horn design• Engineering design started

– Iteration of• Fine tuning of horn shape• Thermal stress analysis

• R&D on-going


Horn R&DHorn R&D

• Goal of stress < 25MPa– diameter of inner conductor 52mmφ

60mmφ– use more realistic cooling condition

in FEM analysis

• 1.09x107 repetition• 50MPa stress at maximum position•• The damage by repetition fatigue The damage by repetition fatigue

was not found.was not found.

Pulsed load Test

FSW

HITACHI, Ltd.

Welding methodWelding method““Friction Stir WeldingFriction Stir Welding”” (FSW)(FSW)

Horn1 inner conductor52mmφ case

Max~60MPa

Thermal stress analysis (time dep.)

Yamanoi, Ichikawa


Recommendations: HornsRecommendations: Horns

• The design group should compare an optimized two horn beam to the proposed three horn beam to demonstrate what the gain is with horn material included.

• A specification for horn construction tolerances should be documented, based on physics systematic error concerns.


Decay Decay volumevolume


Decay volumeDecay volume

• Cover OAB 2~3deg.– Peak Eν ~ 500-800MeV

• Helium filled to reduce absorption.• Water-cooled He vessel inside

concrete shield• 71.4m part of vessel purchased.• Start construction of crossing part:

May 2004

3NBT

130m

5.4mOA2o

OA3o

He vessel wall equipped w/ water piping

Sakuda


Recommendations: Decay VolumeRecommendations: Decay Volume• Although there is a slightly higher cost, there must be as

many independent water-cooling loops as possible. The safety margin in the water-cooling capacity must allow to close off some of the cooling loops in the event of leaks.

• It would be preferable to be able to fill helium in the decay volume without pumping the volume (i.e. by flushing –reduces risks for the entrance/exit windows and risk of the volume buckling under vacuum).

• Since the water cooling circuits are located on the inside of the decay volume, a scheme for (a) detecting a water leak (b) emptying the water at the bottom end of the decay volume (c) storing the radioactive water in a tank near the hadron stop area (etc.) needs to be developed.

• The design of the exit flange must be robust enough to withstand a few "shots" of the full 4 MW beam. In particular, water-cooling pipes must be placed outside the range, which is potentially hit by a (possibly mis-steered) proton beam.


Dump & Dump & muon muon

monitormonitor


Conceptual design of Beam Dump and Muon PitConceptual design of Beam Dump and Muon Pit

Cooling Cooling pathpath

MuMuPitPit

Iron block Iron block 660t660t

(DURATEC?)(DURATEC?)

CoreCoreCu 230tCu 230t

• Boundary conditions– Total shield thickness radiation dose– Max temp. in core heat load– Thermal shock heat load– Cooling water radio-activation hadron flux

• Conceptual design satisfying all conditions done. (MARS, FEM,..)• Muon penetrating to muon pit : threshold ~5GeV

T.Ishida


3.0 cmtargetproton beam

Muon monitor threshold study Muon monitor threshold study

•• Energy threshold below ~ Energy threshold below ~ 5GeV necessary5GeV necessary

• Env. aft. 5GeV equiv. shield– 2.4x1014 muons/cm2/year– Same level as LHC

• Possible detector options– Ionization chamber– Diamond– Silicon (possible rad. damage to

be assessed.)

Examplex=5mm off center

Proton Position on Target (cm)

Muo

n P

rofil

e C

ente

r (cm

)

Sensitivity of profile on proton position on target

Kameda


Recommendations: Beam dump & Muon Recommendations: Beam dump & Muon monitoringmonitoring

• Extra space should be reserved in the beam dump / muon monitor cavern to allow for an evolution in the design of the beam dump (aluminium or graphite instead of or together with copper).

• Independent cooling loops in the beam dump water-cooling system must ensure that there is enough cooling capacity even if several loops have to be closed off due to leaks.

• Muon monitors should be built based on robust, existing technology such as ionisation monitors. R&D efforts for muon monitors are to be avoided.


T&M group(~10)

Hadron beam/hall group

ν const. group (~13)

In reality,In reality,……..

~2~5 ~6

3rd Phys. Div., IPNS

~3

KEKKEK--K2KK2Kgroupgroup(P8, T1)(P8, T1)

12GeV12GeV--PS Beam PS Beam Channel GroupChannel Group(P7,T6)(P7,T6)

Cryo.Sci.C.

ν SC mag. G

Cryo.G.,IPNS

OpticsNormal con.Power supplyVacuumSurvey/AlignmentWindow/HornTS/DV/DumpRemote handlingFacility/civil.Radiation protection280m ND hall

TargetProtonmonitor

Supercon.mags

ν cryogenics

~8

~5

We absolutely need more man power…..


Civil const. schedule requestedCivil const. schedule requested2004 2005 2006 2007 2008

DV crossing part

Primary beam tunnel

Upstreambuilidings

DV remaing part

TS

Dump/µ-pit

280m hall

• Goal: beam on Jan.2009• Present inconsistencies

– Primary beam line• 50GeV on Oct.2007• Still some work needed in 2008 in primary

line• Longer shutdown in 2008?

– Target station (serious)• TS civil/build. end Sep.2009?• Target/horn installation: Apr.2008~• TS vessel, instrumentation:Jan.2008~• Want TS const. 1yr earlier


Recommendations: Radiation & Safety Recommendations: Radiation & Safety IssuesIssues

• Further studies should be carried out to determine the optimum configuration of shielding to permit access to the proton beam tunnel during commissioning and operation of the 50 GeV main ring (without fast extraction).


Recommendations: ScheduleRecommendations: Schedule

• The construction of the target hall should be advanced by one year to allow sufficient time for the installation of the target/horn components and the checkout of the remote handling methods.


Possible contribution from abroadPossible contribution from abroad• Jan.11,12,2004 “T2K” collaboration meeting

– Discussed mainly on possibilities of foreign contributions• Normal conducting magnets

– Russia,…• Superconducting magnet

– LHC parts: Europe– Corrector : US(BNL,SUNY-SB)

• Cryogenics– Europe

• Proton beam monitors– TRIUMF, Saclay, RAL,…

• Remote maintenance system– TRIUMF, Saclay, RAL, …

• 280m detector– Almost all institutions


Executive summary Executive summary (as conclusion)(as conclusion)

• The committee feels that there are no “show stoppers” in terms of meeting the design goals for 0.75 MW operation.

• A time frame of 5 years for the completion of the neutrino facility is a realistic goal.

• more people (even if only available part-time) with expertise in accelerator design, beam instrumentation, ………. must be assigned to the project.

• One design constraint that has already been established is the repetition rate of the 50 GeV ring, with a cycle time of 3.53 s (2.83 s if the standby state is removed). This leads to a rather high intensity of 3.3 x 1014 protons/pulse for 0.75 MW operation and presents some interesting design challenges in handling the thermal shock from the beam. The design group has made good progress in solving the beam intensity issues for this power level.

• Support from the KEK Director and from the J-PARC Project Directorwill be required to ensure that the necessary resources are applied to make this project a success.

• Another area where improved cooperation seems to be required is between the 50 GeV accelerator group and the neutrino facility construction group.


Proposal to make Proposal to make νν--tactac as standingas standing• Neutrino facility is now one of the largest projects

in J-PARC (~160M$)• J-PARC neutrino experiment is really international

project (12 countries)• Neutrino beam line is the critical component for the

success of the experiment.• The neutrino facility design, development and

construction must be open internationally and be exposed under regular critical reviews to ensure success.

• Place to answer advices and home works we got from the committee

Report from ν-TAC - KEKT.Kobayashi (KEK) J-PARC NPFC Feb. 16, 2004 6 Q5P V2 PQ 2A PQ 4A PH 3 P 4B...

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Transcript of Report from ν-TAC - KEKT.Kobayashi (KEK) J-PARC NPFC Feb. 16, 2004 6 Q5P V2 PQ 2A PQ 4A PH 3 P 4B...