The ri beams from the tokai radioactive ion accelerator complex triac
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The RI Beams from the Tokai Radioactive Ion Accelerator Complex (TRIAC). Collaborator. A. Osa, S. Abe, T. Asozu, S. Hanashima, T. Ishii, N. Ishizaki, H. Kabumoto, K. Kutsukake, M. Matsuda, M. Nakamura, T. Nakanoya, Y. Otokawa, H. Tayama, Y. Tsukihashi

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The RI Beams from the Tokai Radioactive Ion Accelerator Complex (TRIAC)

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The ri beams from the tokai radioactive ion accelerator complex triac

The RI Beams from the Tokai Radioactive Ion Accelerator Complex (TRIAC)


Collaborator

Collaborator

  • A. Osa, S. Abe, T. Asozu, S. Hanashima, T. Ishii,

    N. Ishizaki, H. Kabumoto, K. Kutsukake, M. Matsuda,

    M. Nakamura, T. Nakanoya, Y. Otokawa, H. Tayama,

    Y. Tsukihashi

    Japan Atomic Energy Agency (JAEA), Tokai, Japan

  • S. Arai, H. Ishiyama, N. Imai, M. Okada, M. Oyaizu,

    S.C. Jeong, K. Niki, Y. Hirayama, Y. Fuchi, H. Miyatake,

    Y.X. Watanabe,

    High Energy Accelerator Research Organization (KEK), Tsukuba, Japan


Jaea tandem facility

JAEA-Tandem facility

Tandem

Booster

Tandem Accelerator:VT=18MV (MODEL 20 UR)

TRIAC

Superconducting Booster:Vacc=30MV

Completion

JAEA-Tandem AcceleratorAug. 1982Superconducting BoosterSep. 1994 TRIACMar. 2005

TRIAC:~1.1MeV/u


Usage of beam times in fy2008

Usage of beam times in FY2008

  • Operation of TRIAC: 23days

  • Nuclear physics

  • Material Science

  • Accelerator development


Upgrade of jaea tandem facility

Upgrade of JAEA-Tandem facility

  • Replacement of acceleration tubes

  • Replacement of 180-degree analyzing magnet at the high-voltage terminal

  • Replacement of in-terminal ion source to a permanent-magnet type 14.5 GHz ECR ion source, SUPERNANOGAN

  • Treatment of degraded superconducting resonators

  • Fabrication of a prototype low beta superconducting twin quarter wave resonator (low-b twin-QWR)


Upgrade of jaea tandem facility replacement of acceleration tubes

Upgrade of JAEA-Tandem FacilityReplacement of acceleration tubes

Initial performance of the maximum terminal voltage, VT =17MV, got worse for years.

Replaced to compressed geometry tubes for the improvement of VT up to 18-20 MV

Original type33gap/MV

VT=18MV

Ultrasonic

Cleaning

Remove micro-particles on

the inside tube wall

→Reduce the conditioning time

Compressed type42gap/MV

Replaced at

Jun. 2003

Ultrapure

water

High-pressure

Water-jet Rinse

Baking in vacuum

200oC, 2 weeks

Filled with N2 gas to store

Compressed Air


Upgrade of jaea tandem facility recover of superconducting resonator

Upgrade of JAEA-Tandem FacilityRecover of Superconducting Resonator

[email protected]=4W with the age

Average Eacc [MV/m]

Year

Effect of HPWR

6.5MV/m @4W

3.6MV/m @4W

Quality factor Q0

Eacc [MV/m]

The acceleration electric field (Eacc) of superconducting cavities decreases to 4MV/m.

To remove small contaminations on the surface of niobium, treatment of superconducting resonators by using High-Pressure Water jet Rinse (HPWR) was carried out.

Cavity

Rotating nozzle

HPWR

Water flow: 6 l/m, Pressure: 6~8 MPa


Upgrade of jaea tandem facility replacement of in terminal ecris

Upgrade of JAEA-Tandem FacilityReplacement of in-terminal ECRIS

180o bending magnet

10GHz

ECRIS

NANOGAN(1998~)

HIAT 8th Matsuda et al.

Faraday cup

(10GHz ECRIS)

Electrostatic quadrupole

triplet lens

Pre-acceleration tube

90o injection magnet

14.5GHz ECRIS

Turbo Molecular pump

Aperture

& Faraday cup

14.5GHz

ECRIS

Ion pump

High Energy side

Low Energy side

Ion beam

Xe30+ has been accelerated.

SUPERNANOGAN(2007~)


Tokai radioactive ion accelerator complex triac layout of triac

Tokai Radioactive Ion Accelerator Complex (TRIAC)Layout of TRIAC

Booster

Ion source

Tandem Accelerator:

Primary beam Driver to ISOL

Ion source: RI production and ionization

ISOL: RI separator and injector to TRIAC

ISOL

Primary beam from Tandem Accelerator

H+32MeV ~1mA

7Li3+64MeV ~200 pnA

Radioactive nuclear beam

Tandem Accelerator


Jaea isol

JAEA-ISOL

  • Danfysik 9000-T (ISOLDE type)

  • Resolving power: 1200

Primary beam

Mass separation

ISOL IS


Jaea isol safety handling system of target ion source module

JAEA-ISOLSafety Handling System of Target-Ion source Module

Shielding cell

Carrying system


Tokai radioactive ion accelerator complex triac layout of triac1

Tokai Radioactive Ion Accelerator Complex (TRIAC)Layout of TRIAC

Booster

Ion source

Tandem Accelerator:

Primary beam Driver to ISOL

Ion source: RI production and ionization

ISOL: RI separator and injector to TRIAC

CB-ECRIS: Charge-breed 1+ ion to q+ ion

ISOL

CB-ECRIS

Primary beam from Tandem Accelerator

H+32MeV ~1mA

7Li3+64MeV ~200 pnA

Radioactive nuclear beam

Tandem Accelerator


Tokai radioactive ion accelerator complex triac 18 ghz ecris as the charge breeder

Tokai Radioactive Ion Accelerator Complex (TRIAC)18 GHz ECRIS as the charge breeder

micro wave: f=18 GHz, P=1 kW

1+-ion

from ISOL

Vacc=VCB

mirror coils: Bmax/Bmin

~1.5 /0.4 T

correction coil: Bmax~0.4 T

movable

deceleration

electrodes

q+-ion

VCB=2•A/q kV

to SCRFQ

sextupole magnet: length=300mm

fin=82.5 mm

Bmax~1.1 T at 75mmf


Tokai radioactive ion accelerator complex triac layout of triac2

Tokai Radioactive Ion Accelerator Complex (TRIAC)Layout of TRIAC

Booster

Ion source

Tandem Accelerator:

Primary beam Driver to ISOL

Ion source: RI production and ionization

ISOL: RI separator and injector to TRIAC

CB-ECRIS: Charge-breed 1+ ion to q+ ion

SCRFQ-linac: Accelerate to 0.17MeV/u

IH-linac: Accelerate to 1.1MeV/u

ISOL

CB-ECRIS

SCRFQ

IH linac

Experimental Apparatus

Primary beam from Tandem Accelerator

H+32MeV ~1mA

7Li3+64MeV ~200 pnA

Radioactive nuclear beam

Tandem Accelerator


Tokai radioactive ion accelerator complex triac performance of linacs

Tokai Radioactive Ion Accelerator Complex (TRIAC)Performance of Linacs

Beam

SCRFQ

Split-coaxial-RFQ (SCRFQ) linac Very compact (diameter = 0.9m) RF frequency25.96MHz Input energy2.1keV/u Output energy178kev/u (A/q≤28) Transmission>90% Vane length8.6m

Inter-digital H (IH) linac 4 cavity tanks, 3 magnetic-quadrupole triplets RF frequency51.92MHz Input energy178keV/u Output energy0.14-1.09MeV/u (A/q≤9) Total length5.6m

Total transmission of two linacs~85%

Duty factor20% ⇒ 100%

IH-linac

Beam


Development of target ion source system schematic view of target ion source systems

Development of Target-Ion Source SystemSchematic view of Target-Ion Source systems

UCx target

Proton beam

Target container

Filament-2

Thin foil

EB heat cathode

Anode with grid

Gas inlet

Outlet Electrode

Ionizer

Radioactive

ion beam

Radioactive

ion beam

Connection pipe

Heat shields

Filament-1

Target container with heater

Proton beam

Uranium Target-Surface Ionization IS

Uranium Target-FEBIAD-B2 IS

UCx target

T=1600oC

T=2100oC

Alkali, alkaline earth, and rare-earth elements

Gaseous and volatile elements

We could not observe short-lived isotopes of In, Sn.


Outlooks

Outlooks

Development of Target-Ion Source SystemU-FEBAID-E Ion Source

Gas inlet

EB heat cathode

Anode with grid

Outlet Electrode

Radioactive ion beam

Connection pipe

Proton beam from

tandem accelerator

Target container

Filament

U-FEBIAD-B2 (1600oC)

Separation efficiencies were miserably decreased for short-lived isotopes.

We could not observe short-lived isotpes of In, Sn

FEBIAD-E + Target container (>2000ºC) →Short release time is expected.

On-line test is in progress.


Development of target ion source system surface ionization is for heavy ion reaction

Development of Target-Ion Source SystemSurface Ionization IS for Heavy ion reaction

W-window

7Li

99% enriched 13C sintered pellet target

Measurement of Li diffusion coefficients in Li ionic conductors

Search of highly excited state of 10Be using deuteron elastic reaction to 8Li

Search of highly excited state of 11Be using deuteron elastic reaction to 9Li

8Li

13C(7Li, 8Li)

7Li3+ beam 67MeV ~100 pnA

1 x 106 ions/s

9Li(T1/2=178 ms) ~102 pps

Request: >5 x 103 pps

Increase a target weight

Increase a beam energy/current

Increase a release speed?


Development of target ion source system release profile of li

Development of Target-Ion Source SystemRelease profile of Li

Release profile of Li by

Heavy ion implantation technique

Separation yield of 8Li/9Li

A 99% enriched 13C sintered pellet target

8Li: ~105 ions/s @100pnA 7Li

9Li: ~102 ions /s @100pnA 7Li

BN Hot pressed sheet target

8Li: ~105 ions/s @100pnA 7Li

9Li: ~104 ions/s @100pnA 7Li


Outlook

OUTLOOK

  • Continuous upgrade enabled JAEA-Tandem facility to deliver a variety beams for experiments.

  • Until now, TRIAC facility provides relatively weak intensity and low energy RNBs. However, we have produced good results by using 8Li beam which is specialty of TRAIC facility.

  • It is expected to allow furtherapplications and progresses especially by use of the RNBs of medium-heavy neutron-rich isotopes.

  • Development of the target-ion source system is one of the highest priority issues on operation of RNB facility.

  • We will carry on the development for the facility.


The ri beams from the tokai radioactive ion accelerator complex triac

Thank you for your attention.


In terminal ecris supernanogan acceleration results and performance

In-terminal ECRIS: SUPERNANOGANAcceleration results and performance


Development of target ion source system release profile of li1

Development of Target-Ion Source SystemRelease profile of Li

Release profile of Li by

Heavy ion implantation technique

Separation yield of 8Li/9Li

A 99% enriched 13C sintered pellet target

8Li: ~105 ions/s @100pnA 7Li

9Li: ~102 ions /s @100pnA 7Li

BN Hot pressed sheet target

8Li: ~105 ions/s @100pnA 7Li

9Li: ~104 ions/s @100pnA 7Li

Thickness dependence

Release time

0.6mmttfast=1.9s

0.2mmttfast=120ms

Separation yield

The ratio 9Li/8Li~1/10 did not change !!

Improved


Application by use of 8 li beam profile of 8 li beam

Application by use of 8Li beamProfile of 8Li beam

  • Beam spot size ~ 7 mmf (FWHM)

  • Energy resolution ~ 2 % (FWHM)

FWHM : 3.8%

@ TRIAC

Yields

Energy (MeV)


Application by use of 8 li beam diffusion study

Application by use of 8Li beamDiffusion Study

/Cu

S.C. Jeong et al., Nucl. Instrum. Meth. B230(2005)596.

SSD

Decay-a

8Li beam

(~0.3MeV/u)

Pulsed beam

(On/Off=1.5s/4.5s)

sample

  • Non-destructive measurement of diffusion

  • Rapid diffusion mechanism of Li-ions in the super ionic conductor materials

  • Time spectrum of detected alphas: Diffusion and lifetime of 8Li


Application by use of 8 li beam production of polarized rnbs

Application by use of 8Li beamProduction of Polarized RNBs

  • b-decay spectroscopy of spin-polarized RNB

  • Nuclear electro-magnetic moments

  • application for material science

Tilted foil method

1. Asymmetric electron transfer

Atomic Polarization PRL47(‘81)487

2. Hyper-fine interaction

Atomic Nuclear Polarization

12B (t1/2=20.2ms, Ip=1+)

carbon foil [email protected] deg.

E=83 keV/u

~ 0.013c

How about higher energy ?

heavier nuclei ?

( PRL 51 (‘83) 180)


Application by use of 8 li beam experiment of polarization of 8 li

Application by use of 8Li beamExperiment of polarization of 8Li

carbon foil

b-NMR setup

Magnet ( 500 Gauss)

plastic scintillator (3 layers)

RF coil, Pt stopper

Tilted-foils

# of foil

Refrigerator

[email protected]

8Li beam @178keV/u

Feasibility study of tilted foil method

with 8Li (Ip=1+ T1/2=838ms)

Spectroscopy of polarized RNBs

around 132Sn

8Li beam

10 tilted foils @ 70 deg.

carbon foil: 10mg/cm2 ~ 45 nm

polystyrene foil: 10~30 nm

42mm

14mm

Y. Hirayama et al.


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