OUTLINE of the K-HALL
K.H. Tanaka for NP Facility Construction TeamK-HALL

Experimental Hall for 50GeV-15μA Slow Beam
The First (Only One?) KAON FACTORY in the WorldSY and K-HALL

Elevation: 2.9m/80m

K-HALL Design

Permanent Concrete
Movable Concrete
IronCopper

K1.8 Separated
Kaon Beamline• Double Stage• 42m - 44m• 4.5msr.% – 4.7msr.%• 60M – 70M K- (1.8GeV/c)• K/π > 1

Technical Issue
Problem is:• JHF (50GeV) PS: More than 100 times Higher
Beam Power than KEK (12GeV) PS.
– More than 100 times Higher Radiation Dose.
– More than 100 times Larger Heat Deposit.

How to Handle MW-Class Beam?
For the Stable Operation• Tight/Enormous Radiation Shield.
• Radiation/Heat Resistant Beam Line Elements.
• Facility Design Oriented for the Maintenance.
– Quick disconnect Devices

K-HALL CROSSSECTION
Water Cooled
Bus Duct:Electric Power
SupplyPermanent
Concrete Shield

Concrete Block
Service Space: QD for Water,
Power, Vacuum and Signal
Cooling
Water Supply

TrenchBeam Transport Part

Concrete BlockIron Shield

MagnetK-HALL Cross Sections

Radiation/Heat Resistant Beam lineElements• High Radiation Resistance• High Heat ResistanceNatural Solution: Remove Organic
Materials from the Beam Line.
Rubber, Plastic, Oil, Paint, andSemiconductors, etc. etc.

2500A Class Mineral Insulation Cable

MI Cable: Completely Inorganic High Power Cable!

Magnet Coil Winding by 60m
2500A HC-MIC

High-Pot. leak test

Coil Winding!

The first coil of 60m-2500A HC-MIC

Heat Up of Beam Dump
by 750kW Beam

• Without Water Cooling: Copper melts• With Water Cooling: Copper Temp. go down to 300 ℃

Production target (T1)
Rotating target and water cooling
Thermal evolution by ANSYS (M. Minakawa)Max~100ºC

T1 prototype (Y. Yamanoi)
Air control

monitor
85RPM(1 per 0.7sec)

CoolingwaterBeam

φ50cm x 6cmt , Ni200
Nickel disk (φ24cm x 6cmt, 24kg)

Production target (T1)
Schematic view of the T1 target
Target support
Moving system
Alignment pins
Ni target disk
φ50cm x 5.4cmT
Water pipe
Bearing

Beam

Cooling water
Alignment pins

Target off

Production target (T1)
Schematic view of the whole system~18m
Concreteshield block~10m

Service space(2mW x 1mH)

Iron shield
ConcreteshieldWaterpump2m

Targetchamber

Beam
The whole system will be tested by the T1 mock-up.

Collimator and Beam Duct
Schematic view of the T1 target area
Extraction at
6 degree2m

Ni target (12kW)

D1(4.1kW)

Q1(<1kW)
K1.8/1.1

BS2Dump

BeamWindow(0.02kW)

Beam duct
Iron block(1.4kW)

Cu collimator(60kW)

Test line ?
K0 ? K1.1?
Need special typeCu beam duct
(36kW)Collimator
Thermal evolution by MARS+ANSYS (H. Takahashi & M. Minakawa)Cu collimator (1.5mH x 1.5mW x 0.2mT)• Aperture size
Beam1.5m

Min~100ºC
0.2m0.75mMax400ºC– H=±10 cm (16cm)– V=±0.8cm (0.8cm)• Acceptance– x=±50mrad– y=±10mrad• 30cm away from T1
To be optimized

T1 Collimator
Configuration

Permanent Concrete
Movable Concrete
IronCopper

Moving Beam Dump
Phase 2Phase 3

Beam dump must be moved for the future extension!

K-HALL Beam Dump
How to move it safely
Dump total weight ~ 1000 t
650 cm/hr
Wire lopeJack up

Tir tank

Guide rail

• Need to be balanced carefully• Guarantee flatness of the floor~50 mConcrete floor

K-HALL Beam DumpRadiation protection (preliminary)
Fe shield(φ4m)

Cu core(φ2 m)

Concreteshield•

3H (T =12.3 year) production at the1/2

surface of Cu core
– ~100 Bq/cc/1 month for 11 m3 Volume(Notice: 20 cm thick cooling water)•

Residual dose rate at contact after 1year irradiation and 0.5 year cooling(KEK safety limit: 500 µSv / day)– 90 mSv/12 hr (averaged) at Cu surface(R=0.8-1.0m)– 0.12 µSv/12 hr (averaged) at Fe end(Z=7.8-8.0m)– 320 µSv/12 hr (averaged) at Fe surface(R=1.8-2.0m)

4m

5m3m

Beam Dump Housing

PermanentConcrete
MovableConcrete
IronCopper

Cooling of Beam-Dump Core

Movable Concrete
IronCopper

STATUS• Tight/Enormous Radiation Shield.
– Design Completed• Radiation Resistant Parts/System.
– Almost Ready.

• Heat Resistant Parts/System.
– Final Stage of Design/R&D.

• Remote Handling System/Maintenance
Scenario.
– Final Stage of Design/R&D.

Construction Schedule at Tokai
2003+

2005

20032004

2005

Magnet Installation in SY is Scheduled in 2004+
Magnet Installation in KH is scheduled in 2006-Magnet Transfer Schedule

Problem： Can K2K be Finished in the summer 2004?

Magnet Collection Project• The budget situation of the J-PARC/JHF is NOT verygood.
• Let us construct the JHF as an international
facility/collaboration!
• Let us collect USED magnets from all through theworld!!!!
– Magnets for secondary lines• Dipoles– Gap: 12 - 20cm
– Width: 30 - 40 cm– Length: 〜1 m or longer– B: 〜2T•Quadrupoles–Bore: 20 – 30 cm–Length: 〜1 m
–B: 〜1 Tesla at pole

• Spectrometers• Contribution from SLAC, CERN, CEA(Saturne),Tsukuba U, and LANL, BNL………

Magnet Collection Projectfrom Saturne near Paris•2 Spectrometer Systems (SPES-I,II)•40 Q-Mags, 30cmΦ0.8-1.6mL, 1T@pole•12 D-Mags, 15-20cm Gap, 1-2mL, 2T

SPES-I arrived at KEK from SATURNE

SPES-I(A23) Magnets

Magnet Collection project fromCERN, SLAC, Tsukuba

Antiproton Accumulator Ring from CERN
Fixed Target Facility Magnets from SLAC
Medical Facility Magnets from Tsukuba U.

Radioactive Iron from DURATEC• 1$/10t• 100$/1t includingtransport fee.
• 1/10 of NormalIron• Max. 2mR atSurface.
• Less than 2nCi/gr(74Bq/gr)• Nuclear Wastes?
• Scheduling?
• Possible in Japan?

Design & Construction of K-HALL

Hadron Beam-Line Subgroup is Responsible