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February 6, 2014 CLIC Workshop 2014 @CERN , Switzerland. “Review of electron linac based neutron sources for nuclear data study". Mitsuru Uesaka (Nuclear Professional School, University of Tokyo), ○ Walter Wuensch (CERN ). CONTENTS.

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review of electron linac based neutron sources for nuclear data study

February 6, 2014CLIC Workshop 2014@CERN, Switzerland

“Review of electron linac based neutron sources for nuclear data study"

Mitsuru Uesaka (Nuclear Professional School, University of Tokyo), ○ Walter Wuensch (CERN)

contents
CONTENTS
  • Necessity of more precise nuclear data for melt fuel analysis in Fukushima and design of ADS
  • S-band electron linac neutron system in Belgium, USA and Japan
  • L-band electron linac neutron system in Japan

4. Proposal of new X-band linac system

slide3

Hideo Harada (JAEA)

Research Background and Purpose

Debris in TMI-2 have been analyzed by INEL (USA).

EC and Canada also analyzed debris supplied by USA.

JAERI (JAEA) also analyzed debris obtained at 1991.

J. M. Broughton, et al., “A Scenario of the Three Mile Island Unit 2 accident”, Nucl. Technol. 87, 35 (1989).

H. Uetsuka, et al., “Gamma Spectrometry of TMI-2 Debris” (written in Japanese), JAERI-Research 95-084.

Non-destructive measurement method of nuclear fuels in melted core hasn’t been developed yet.

Quantity of nuclear materials in melted cores which are generated in nuclear accident like Fukushima is measured by non-destructive and high accuracy methods

conceptual diagram of nrd facility

Hideo Harada (JAEA)

Conceptual Diagram of NRD Facility

Accelerator for pulsed neutron generation

  • By NRTA, 3-7 kg of small sized MF will be measured within 20 min.

(The 3-7 kg: a MF area of 300-700 cm2 and a thickness of 10 g/cm2).

  • By NRCA, 30 g of MF including 109Bq(mainly 137Cs) will be measured within 1 hourfor each beam line.

Neutron detector

n ~1012 n/sec

Gamma detector

Sample for NRTA

Beam dump

Sample for NRCA

tof measurement by small pulse n eutron source
TOF Measurement by Small Pulse Neutron Source

Hideo Harada (JAEA)

Flight path = 5 m for NRTA

A Rough Sketch of Prototype Neutron Resonance Densitometer

typical nrta data of nuclear materials

Hideo Harada (JAEA)

Typical NRTA Data of Nuclear Materials

236U

239Pu

238U

240Pu

242Pu

239Pu

241Pu

238U

133Cs

145Nd

152Sm

243Am

241Am

235U

238U

131Xe

235U

235U

Transmission

4

6

8

10

20

40

2

1

Neutron Energy / eV

Behrens et al., Nucl. Techn. 67 (1984) 162

contents1
CONTENTS
  • Necessity of more precise nuclear data for melt fuel analysis in Fukushima and design of ADS
  • S-band electron linac neutron system in Belgium, USA and Japan
  • L-band electron linac neutron system in Japan

4. Proposal of new X-band linac system

tof facility gelina

FLIGHT PATHS NORD

ELECTRON LINAC

TARGET HALL

FLIGHT PATHS SOUTH

TOF - Facility GELINA
  • Pulsed white neutron source
    • (10 meV < En < 20 MeV)
  • Neutron energy : time – of – flight (TOF)
  • Multi-user facility: 10 flight paths (10 m - 400 m)
  • Measurement stations with special equipment to perform:
    • Total cross section measurements
    • Partial cross section measurements

Mondelaers and Schillebeeckx, Notizario 11 (2006) 19

hokkaido university 45 mev electron linac
Hokkaido University 45 MeV electron linac
  • Neutron room
  • 21.1m

3.5m

  • 6.4m
  • 1.96m
  • 45 MeV LINAC

3.5m

  • 6.12m
  • Target room
  • 1m
  • Target room + LINAC =42.5 m
  • 17
performance of hokkaido university 45 mev electron linac
Performance of Hokkaido University 45 MeV electron linac

S-band electron linear accelerator

Maximum energy:45 MeV

Maximum current: 140μA

Repetition: single 10pps~200pps

Pulse width: 10ns ~3μs

The electron beam is transported to the target room.

RIGHT: Pulsed cold neutron source

CENTER: Pulsed thermal neutron source, electron beam irradiation

LEFT: Fast neutron experiments

typical neutron and photon source
Typical Neutron and Photon Source
  • • 2mm thick lead radiator
  • • Electron Beam Energy = 25 MeV
  • • Pulse Width = 0.2 μs
  • • Rep.rate = 50 pps
  • • Electron beam current = 2 μA
  • Intensity 20~30MeV ~1012 (1/s)
  • Bremsstrahlung photon
  • PHITS
  • Simulation
  • Intensity of neutrons
  • Below 25.3meV 1.0×103 (1/cm2/s)
  • @L=6m
  • 4.8×10^9(1/s)@Neutron Source
  • exp
  • Cold neutron
  • By Prof. Kiyanagi, and Prof. Kino’s presentation
contents2
CONTENTS
  • Necessity of more precise nuclear data for melt fuel analysis in Fukushima and design of ADS
  • S-band electron linac neutron system in Belgium, USA and Japan
  • L-band electron linac neutron system in Japan

4. Proposal of new X-band linac system

slide21

Present status of KURRI-L-band Linac

Research Reactor Institute,

Kyoto University

Jun-ichi Hori

・Specification of injector

electric gun : YU-156(EIMAC)

incident voltage : 100kV DC, incident current : Max 10A

・Specification of RF driver

output : 3kW, frequency : 1300.8 MHz

・Energy of electron for neutron generation : ~30 MeV

・Peak current : ~5A (short pulse) 2~100ns width

~0.5A(long pulse) 0.1~4 ms width

・Frequency:1~300 Hz (short pulse)

1~100Hz (long pulse)

・Neutron target : Ta with H2O moderator

・Power on target : Maximum 6 kW (200mA, 30MeV)

・Electron beam diameter on target : 1 cm

・Neutron production : ~8×1012 n/s @6kW

slide22

Injector and accelerator tubes

Target room

Water moderator in Al case

Ta target

Ta target and water moderator (Type-2)

Ta target and water moderator (Type-1)

2 flight path
2. Flight path

Cooling tower

Measurement room at 24m

Measurement room at 10m

Measurement room at 12.7m

Target room

Ta target

Lead spectrometer

Experimental room

Flight tube : 2 lines

Flight path :

10.0, 12.7, 24.2 m

Control room

contents3
CONTENTS
  • Necessity of more precise nuclear data for melt fuel analysis in Fukushima and design of ADS
  • S-band electron linac neutron system in Belgium, USA and Japan
  • L-band electron linac neutron system in Japan

4. Proposal of new X-band linac system

tof time of flight system for nuclear data measurement

X

X

レーザー

レーザー

電子ビーム

電子ビーム

TOF(Time-Of-Flight) system for nuclear data measurement

Ce:LiCAF

X-ray

Laser

existing x band 30 mev electron linac will be moved for neutron source

X

X

レーザー

レーザー

電子ビーム

電子ビーム

Existing X-band 30 MeV electron linacwill be moved for neutron source

More than 10 mTOF

planning area

5 m TOF

planning area

More than 40 mTOF

planning area

30 MeV X-band Linac

70 cmaccelerator tube

Klystron and power

source are set

around the reactor

20 keVelectorngun + 5 MeVbuncher+30 MeV structure

+ Neutron target

    • Peak Beam current: 250mA (Beam energy: 30MeV・Pulse width: 1μsec)
    • Beam Power:0.375kW (50pps)
  • (S-band 30MeV⇒1kW(Hokkaido Univ.))
s band vs x band
S-band vs X-band
  • Electron Energy: Both are available
  • Charge per microbunch: X is ~1/10
  • Bunches for RF pulse: X is 3~4 times
  • Charge and Peak Current per RF pulse and Average Current/Power: S is higher by ~2.
  • However, X-band 6 MW 400Hz Klystron is
  • under development so that the current/power
  • becomes closer.
  • Size: X is smaller.
  • Price is linear to Beam Power, maybe.
summary
Summary
  • Several L/S-band electron linac neutron sources are operating for nuclear data study in the world.
  • Precision of nuclear data must be improved for Fukushima accident analysis and design of new nuclear system such as ADS.
  • New X-band electron linac neutron source is proposed and under construction at University of Tokyo.
  • Almost all L/S-band systems are older than 40 years and it is the time of renewing.
  • Due to compactness of X-band system, it can be installed in existing shielding facilities. Even its intensity is expected to be upgraded by new X-band high rep rate klystron.

Thank you for your attention.