construction of the iren 1-st stage

Construction of the IREN 1-st stage

V. Shvetsov

FLNP

September 27 2007 JINR SC 102-nd session

TOC

Brief history of the IREN project Decision on project reduction IREN 1-st stage parameters Scientific program for the IREN 1-st stage Tasks completed in 2006-2007 Accident with SLAC 5045 klystron –

consequences & decision fork Conclusion


IREN history

Project started in 1993 with 3 years schedule, was approved by the CPP

1015 n/s integral intensity at 400 ns pulse width promised 30-50 gain in source quality in comparison with IBR-30

Designed parameters put IREN in range with most intensive resonance neutron sources (LANSCE, ORELA, GELINA)


IREN history

Within 1993-1997 project financing formed k$ 870 at designed budget cost M$ 3.7

Within 1998 – 2005 project financing reached about M$ 2.4, but the project cost also raised seriously due to inflation and was estimated about M$ 5.3

At that time about 80% of accelerator equipment (including accelerating sections) were delivered to JINR; fuel elements were manufactured and delivered to JINR; IBR-30 was decommissioned


Decision on project reduction

In the end of 2005 becomes clear that resources of the “Neutron Nuclear Physics” scientific direction are not sufficient for project realization

FLNP directorate proposed to reduce the project down to electron linac with nonmultiplying target

It was discussed at the JINR Directorate meeting (October 13 2005) and JINR Scientific Council 99-th session (January 19-20 2006)

“The Scientific Council recommends that the Directorate and this PAC [on nuclear physics] estimate the impact of this choice on the excellence of the scientific programme which may be reduced. “


Decision on project reduction

Scientific program for reduced IREN project was reported at the 24-th meeting of the PAC for Nuclear Physics (April 6-7 2006)

“The PAC recommends that the JINR and FLNP directorates maintain the momentum of the project implementation, extend cooperation with other laboratories and institutions to construct by the end of 2007 the 1-st stage of IREN, including the electron accelerator, the stand for applied research and the neutron production target”

At the 101-st session of JINR SC the following resolution was approved: “The Scientific Council is pleased to hear that the construction of Phase I of the IREN facility is progressing on schedule and looks forward to the commissioning of IREN in late 2007. It would like to hear more about the scientific opportunities presented by Phase I of IREN.”


IREN 1-st stage parameters

Initial data: E=100 MeV, I=2.5 A, dt=100 ns, f=50(150) Hz



Neutron flux density at sample position:Neutron flux density at sample position:

)uexp()(

)(

L

S)E(E s

smpl

0

0

2

1

4 2

Target 238U W

Intensity loss

87

240

Flux density at sample position loss*

5.8 (10 eV)

3.5 (100 eV)

15.8 (10 eV)

9.4 (100 eV)



IREN neutronics


Ti C

u

Cu

e-

e-

H2 O

H2 O

Al

W


Gamma-source at IREN 1015 s-1



Irradiation channels for NAAThermal neutrons spatial distribution (5.7-6.3)*109 n/cm2*s


RQCDmax 10 6

Nuclear fissionNuclear fission

FundamentalFundamental

AppliedApplied

Fundamental Fundamental symmetriessymmetriesIn neutron In neutron

induced reactionsinduced reactions

Ultracold neutronsUltracold neutrons

Highly excitedHighly excitedstates of the nucleistates of the nuclei

Neutron activation Neutron activation analysisanalysis

Fundamental properties Fundamental properties of the neutronof the neutron

Neutrons in spaceNeutrons in space

Construction of the Construction of the IRENIREN


Scientific program for the IREN 1-st stage

Isotopes production at IREN 1-st stageIsotopes production at IREN 1-st stage

More than 50 isotopes could be efficiently produced at IREN gamma More than 50 isotopes could be efficiently produced at IREN gamma source with (gamma, n), (gamma, 2n), (gamma, p) reactionssource with (gamma, n), (gamma, 2n), (gamma, p) reactions

FLNR experience in particular isotopes:FLNR experience in particular isotopes:

Yield calculated for IREN 1-st stage from experimental data obtained at FLNR microtronYield calculated for IREN 1-st stage from experimental data obtained at FLNR microtron

Nuclides Lifetime, h Reactions Target nuclei Reaction threshold,

MeV Yield*, (kBq / mkA h mg)

Mo9942 66 ),(100 nMo 9.62 % -8.29 240

Ac22589 240 ),(226 nRa 0.65 mkg -6.75 40

U23792 162 ),(238 nU 99.27 % -6.15 80



Isotopes production at IREN 1-st stageIsotopes production at IREN 1-st stage

0.1586

2/1

2/3

2/11

0.0

0.3146

Snm11750 (13.60 d)

Sn11750

ZrG1

Mo3

Au1a

Sn118

Au2a

Sn

Au3a

Mo

Au4a

Mo4

ZrG2

Monitors (Zr, Au, Mo)

Monitors (Zr, Au, Mo)

Samples: Natural tin 163.5 mg118Sn (98.5%) 30.4 mg

118Sn(,n)117mSnRSA ( NECSA) proposalRSA ( NECSA) proposal

Experiment performed in Feb. – March 2007 at FLNR Microtron accelerator



Gamma spectra from enriched tin sample

117mSn

Recoil energy Recoil energy ~1 keV - ~1 keV - Investigations on Investigations on chemical process for chemical process for 117m117mSn extraction are in Sn extraction are in progress. RSA students progress. RSA students and young scientists will and young scientists will join in the end of 2007join in the end of 2007



Radio-nuclides

Half -life

Main Energy,

keV

Photons Intensity,

%

Production Reaction

Reaction Energy,

MeV

Abundance of target, %

Yields, Bq/

μA h mg

117mSn 13.6 d 158.40 65.00

117Sn (γ,γ’) 118Sn (γ,n)

119Sn (γ,2n)

-0.32 -9.65 -16.13

7.57 24.01 8.5

1.02E+5

117mSn 13.6 d 158.40 65.00 118Sn (γ,n) -9.65 98.5 1.91E+5* 111In 2.83 d 171.29

245.35 91.00 94.00

112Sn(γ,p) -7.73 0.95 3.13E+4 4.04E+4

113Sn 115 d 391.71 245.35

64.17 94.00

114Sn(γ,n) 115Sn(γ,2n)

-10.32 -17.85

0.65 0.34

1.15E+5

123Sn 129 d 1032.00 1089.00

0.04 0.59

124Sn(γ,n) - 8.51 5.98 5.13E+4

99Mo 66.02 h

140.50 181.06 739.70

4.95 6.00 12.10

100Mo(γ,n) -8.29 9.62

5.4E+5

196Au 6.2 d 333.00 355.72

24.40 93.60

197Au(γ,n) -8.09 100.00 1.5E+6

89Zr 78.4 h 909.10 99.00 90Zr(γ,n)

91Zr(γ,2n) -11.99 -19.19

51.46 11.23 5.2E+5

Preliminary results of 117mSn production using FLNR Microtron electron accelerator



Neutron/gamma activation analysisNeutron/gamma activation analysisIBR-2 will stop for modernization in 2007, IBR-2 will stop for modernization in 2007, sector of NAA is planning to continue sector of NAA is planning to continue research at IREN 1-st stage:research at IREN 1-st stage:

R elative un its

Zn

Tula

Zaokskiy

Aleksin

Suvorov

Belev

Odoev

Yasnogorsk

Novom oskovskSchekino

PlavskBogoroditsk

Arsen’evo

Chern’

Efrem ov

Uzlovaya

Teploe

Kurkino

Venev

Kireevsk

Kim ovsk

Volovo

V

Tula

Zaokskiy

Aleksin

Suvorov

Belev

Odoev

Yasnogorsk


PlavskBogoroditsk

Arsen’evo

Chern’

Efrem ov

Uzlovaya

Teploe

Kurkino

Venev

Kireevsk

Kim ovsk

Volovo

Ni

Tula

Zaokskiy

A leksin

Suvorov

Belev

O doev

Yasnogorsk


P lavskBogoroditsk

Arsen’evo

Chern’

E frem ov

Uzlovaya

Teploe

Kurkino

Venev

K ireevsk

K im ovsk

Volovo

As

Tula

Zaokskiy

Aleksin

Suvorov

Belev

Odoev

Yasnogorsk


PlavskBogoroditsk

Arsen’evo

Chern’

Efrem ov

Uzlovaya

Teploe

Kurkino

Venev

Kireevsk

Kim ovsk

Volovo

BiomonitoringBiomonitoring Material scienceMaterial science BiotechnologyBiotechnology



((n,p), (n,alpha) reactions investigations at high energyn,p), (n,alpha) reactions investigations at high energy

Reaction Q, MeV Abund., %

30, b 100 eV –

1 keV 1 keV – 10 keV

10 keV – 100 keV

32S(n,)29Si 1.525 95.02 8.7·10-6 7.0·10-6 45

3.2·10-6 19

1.2·10-6 7.3

35Cl(n,p)35S 0.615 75.77 1.6·10-3 1) 8.3·10-3 56000

1) 3.5·10-4 2400

1) 1.6·10-5 110

10 res. up to 110 keV,

36Ar(n,)33S

2.001 0.337

4.9·10-5 2.2·10-6 91

8.2·10-7 37

3.4·10-7 15

45Sc(n,p)40Ca 0.526 100 9.1·10-6 3.5·10-5 35

1.4·10-5 13

5.7·10-6 5.9

50V(n,p)50Ti 2.999 0.25 3.9·10-4 7.7·10-8 3.5

3.0·10-8 1.3

1.2·10-8 0.53

64Zn(n,)61Ni 3.866 48.6 2.4·10-4 1) 4.2·10-4 2) 2900

1) 7.6·10-4 2) 5200

8.0·10-6 2) 53

2 res. up to 3 keV

67Zn(n,)64Ni 4.879 4.1 3.1·10-4 1) 1.7·10-6 11

1) 1.4·10-6 9.1

8.0·10-7 5.3

9 res. up to 4 keV

96Ru(n,)93Mo 6.381 5.52 1.5·10-5 2.1·10-7 1.5

8.3·10-8 0.53

3.3·10-8 0.23

99Ru(n,)96Mo 6.822 12.7 4.3·10-5 1.5·10-6 10

6.1·10-7 4.0

2.3·10-7 1.5

7 res. up to 600 eV

147Sm(n,)144Nd 10.114 15.0 3.2·10-5 1) 1.3·10-5 2) 91

3.3·10-7 2) 12

1.2·10-7 2) 4.6

104 res. up to 1 keV, (E) up to 300 keV



(n,p), (n,alpha) reactions investigations at high energy(n,p), (n,alpha) reactions investigations at high energy

1E-3 0,01 0,1 1 10 100 1000 100001E-11

1E-10

1E-9

1E-8

1E-7

1E-6

1E-5

1E-4

1E-3

0,01

0,1

1

arbi

trar

y un

its

En, keV

kT=8 keV

kT=256 keV

Nuclear physicsNuclear physics

0 200 400 600 800-0,4-0,3-0,2-0,10,00,10,20,30,4

1E-3

0,01

0,11

10

100

fb

En, eV

np

, b

35Cl(n,p)35S reaction cross section 35Cl(n,p)35S reaction cross section and forward-backward coefficient. and forward-backward coefficient. Dashed lines indicate error corridor Dashed lines indicate error corridor due to uncertainties of experimental due to uncertainties of experimental data (solid squares) data (solid squares)

Astrophysical aspectsAstrophysical aspects



Methodical research with polarized neutrons and nucleis

s

x

y

y

z

z

H

H

I

I

k

target assemble

guidechannel

polarizer

a)

b)

x=[Ixk]

3-fold correlation, polarized nuclear target

][ kIs

5-fold correlation, aligned nuclear target

kIkIs

][

IkEpIksDpksCIsBpAf ttt

][0

Orthogonality should be better than 10Orthogonality should be better than 10-4-4

Nuclei polarization uniformityNuclei polarization uniformity Energy dependence of the false effectsEnergy dependence of the false effects

IREN 1-st stage potential:IREN 1-st stage potential:• neutron polarization vector control with precision 0.7 10neutron polarization vector control with precision 0.7 10 -3 -3 rad/dayrad/day• nuclei polarization – accuracy less than 1% per hournuclei polarization – accuracy less than 1% per hour• False effects energy dependence within 0.2 – 5 eV interval with accuracy 1%False effects energy dependence within 0.2 – 5 eV interval with accuracy 1%


Tasks completed in 2006-2007

Working projects of water/power supply, fire prevention, radiation safety and other systems were finished, necessary equipment manufactured or purchased;

Until November 2007 all engineering infrastructure in accelerator building will be installed;

Until November 2007 main control room and auxiliary rooms will be repaired and ready for equipment assembling

About 70% of LUE-200 equipment was mounted on site, partly tested and certified;

Nonmultiplying target is under construction and will be ready by the end of 2007.

JINR Directorate provides financing of the project in accordance with approved time schedule and project budget.


Accident with SLAC 5045 klystron – consequences & decision fork

Time schedule of the project was directed to the linac startup at the end of 2007. At present time one have to acknowledge that this goal will not be reached: in June 2007 during operation on SLAC 5045 klystron mounting it was severely damaged. It was the only klystron and we do not have possibility to replace it.



One option to start IREN 1-st stage with lower energy of electrons is to adjust spare TH2129 klystron from Linac 800 accelerator. With one accelerating section electron energy 60-70 MeV instead of 100 MeV could be reached with the same average current and increased peak current. Neutron and gamma yield will be 1.7 – 2.1 times lower.

Work on integration of integration of the TH2129 klystron is in progress. Estimated time – about 3 months.



Another option is to purchase from SLAC the klystron tube.

Negotiations with SLAC are in progress, cost of the klystron tube is k$ 350 + shipping and insurance. Delivery time – not earlier than February 2008

This cost is twice more than annual project budget and to realize this option additional financing is necessary


Conclusion

The future of the project is seriously jeopardized by klystron accident;

Nevertheless, project management appeals to the Scientific Council with application to give us the chance and put IREN 1-st stage into operation starting with TH2129 klystron by the middle of 2008.

construction of the iren 1-st stage

Documents

stage of iren

project reduction iren

reduced iren project

iren projectdecision

commissioning of iren

iren facility

project financing

project cost