nTOF CollaborationCollaboration Board Lisbon 1315 December 2011 1 Proposal of Experimental Area 2 EAR2 ITEMS nTOF CollaborationCollaboration Board Lisbon 1315 December 2011 Why EAR2 ID: 921293
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Slide1
E.Chiaveri on behalf of the n_TOF Collaboration
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Proposal of Experimental Area 2 (EAR-2)
Slide2ITEMSn_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011Why EAR-2Scientific Motivation
Dosimetry and Radiation Damage Facility Performance (see Christina Talk)Radiation Protection Analysis
Civil Engineering
Budget & Tentative planning List of Examples of EAR-2 Proposals
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Slide3n_TOF target
New
Experimental
Area (EAR-2)
EAR2
EAR-1
(at 185 m)
~ 20 m
Flight-path length : ~20 m
at 90° respect to p-beam direction
expected neutron flux enhancement
drastic reduction of the t
0
flash
10 m
n_TOF
Collaboration/Collaboration Board
Lisbon, 13/15 December 2011
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Slide4EAR-2 ExperimentsExperiments in EAR-2 can be performed : on very small samples
(important to reduce mass of unstable samples and in cases where sample material is limited)
on isotopes with very small cross sections (where signal/background ratio is crucial)
in much shorter time
(measurements can be eventualy repeated to reduce systematic uncertainties)
Measurements of neutron-induced cross sections at high energies (E
n
>10-100 MeV), which are not possible in the existing EAR-1, will benefit from largely reduced the
-flash.
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide5Scientific Case for EAR-2Astrophysical ResearchNuclear Technology ApplicationBasic Nuclear Researchn_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 20115
Slide6Dosimetry and Radiation Damage StudiesCharacterization and calibrations of passive and active dosimeters as well as of detectors. Test in its stray radiation field the
radiation resistance of electronic and structural components as well as of cablesn_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide7Dosimetry and Radiation Damage StudiesPosition 1: at 1.4-1.8 m above the targetPosition 2: the standard EAR-2 experimental area at about 19 m from the target n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide8Dosimetry and Radiation Damage Studiesn_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
1 MeV (Si) equivalent neutron fluence rate. This quantity is a measure for displacement damage in (electronic) silicon-based devices. It can be correlated to its long term damage
Ambient dose equivalent (H*(10)) rate. This quantity is of relevance for passive and active dosimeters and radiation monitors
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Slide9Dosimetry and Radiation Damage Studiesn_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
Neutron Spectrum at Position 19
Slide10Basket for samplesn_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201110
Slide11View of complete linen_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201111
Slide12Beam line with Permanent magnetn_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201112
Permanent magnet
Slide13View of Basketn_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201113
Slide14View of Shuttern_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201114
Slide15Shutter on the Beam Linen_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201115
Shutter
Slide16Beam Line near the Targetn_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201116
Slide17Radiation Protection StudySource termBunker ShieldingDump ShieldingConclusionsn_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide18Source term NeutronNeutron spectrum from Christina and Marco (integral = 8.0E06 neutron/cm-2) Source routine to sample from the energy distribution and considering an annular beam 30 cm diameterNormalization for prompt dose rate calculations : = 8.0x1006 x p x 30/2 x 30/2 x 4 / 16.8
1.62E09 neutrons/s entering the area
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide19Prompt dose rateTwo scenarios :Full beam goes to the dump (thin samples….)Thick target inside the bunker scatters the incoming neutrons (detectors, samples for irradiation, flanges….)Scoring prompt dose rate outside the bunker n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide20Shielding criteriaEdms 810149 : AREA CLASSIFICATION
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201120
Slide21EAR-2 Geometryn_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201121
Slide22Calculation for 8 cm collimatorThick wall compatible with 8 cmand 30 cm collimators
Shielding for8 cm collimator
Additional shielding for
30 cm collimator upgrade
Dose profile (next slides)
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide23Dose profile for 8 cm collimator8 cm collimator considered for the normalization (below the design limit for non permanent workplace = 2.5 mSv/h)Considering a scattering target in the experimental area
Non permanent
workplace
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide24Dose profile for 30 cm collimator30 cm collimator considered for the normalization (below the design limit for non permanent workplace = 2.5 mSv/h )Considering a scattering target in the experimental area
Non permanent
workplace
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide25Dump shieldingNothing intercept the beam, maximum neutron flux (30 cm diam. collimator)Shielding criteria is 2.5 mSv/h (limit for low occupancy unclassified area)Shielding requirements :Iron 150 cmx150 cm x 150 cmSurrounded 25 cm of borated poly (5 %) on sides and 50 cm along beam directionSurrounded by 20 cm of concrete (sides) and 25 cm along beam direction
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide26Beam to the dumpDesign for 30 cm collimator
Dose profile
Dose profile
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide27Conclusions shielding analysisBeam dump thickness and material specified (would allow 30 cm collimator operation)Experimental area walls thickness specified (shielding of the walls except the “shared” wall could be implemented in two steps if 30 cm upgrade is decided)Integration in the ISR8 being studied (shielding in the technical gallery to mitigate the higher radiation levels due to the removal of the plug)n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide28Requirements for EAR2The Experimental Area on surface must be Work Sector Type A (WSTA)The main requirements with proposed main Actor are:Drilling of the shaft on top of the Target (~10m) GSBuilding on surface (WSTA conditions)
GS+DGS/RPVertical beam dump (reduced neutron albedo
) EN/STI +DGS/RP
Monitored and filtered ventilation (WSTA conditions) EN/CV + DGS/RP
Changing room/Material Entrance (WSTA Conditions)
EN/MEFMonitoring: dose rate, aerosol concentration, hand-foot monitor, portable monitor
DGS/RP
Controlled Access
GS/ASE
Since October 2010 Five Meeting
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide29n_TOF barracksTOTEM barracks to be relocated
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide30n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201130
Slide31Overview of the n_TOF spallation target arean_TOF target pit
Technical gallery (@10 m from pit)
EAR2 (@20 m from pit, above ground)
Existing hole
To be built
ISR
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide32EAR-2 Geometryn_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201132
Slide33EAR-2 Geometryn_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201133
Slide34EAR-2 Geometryn_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201134
Slide35EAR-2 Geometryn_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201135
Slide36Overview of the n_TOF EAR2n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201136
Slide37Overview of the n_TOF EAR2n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide38n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011EAR2 Installation
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Slide39n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201139
Slide40Existing fireplace
Roof ISR
Ep.mini
1300mm
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide41Slab 200mmPhase II
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide42Slab 200mmPhase II
Shielding
Phase
II
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide43n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201143
Slide44Vacuum chamber 1
Gap 12mm (air)
Pre centering
(to be added)
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide45Vacuum chamber 1
bellow
Fixe point
New shielding
Gap 35mm
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide46Vacuum chamber 2
Shaft Ø600 int
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide47Collimator
Steel4x0.5m
borated polyethylene 2x0.5m
aligment
±30mm
3 points
positionment
5 tons !
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide48Collimator
Bellow(±30 mm)
Vacuum chamber 3
Ø80 mm
Connection without flange
Concrete
arround
shaft Ø900 ?
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide49Sectionsn_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201149
Slide50Vacuum window-Aluminium alloy EN AW-6082 forged-Machined
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide51Vacuum windown_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201151
Slide52Vacuum windown_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201152
Slide53Cost estimation for EAR2Dismantling barrack 559Drilling of the shaft on top of the TargetConstruction of the Laboratory (~64m2 WSTA)Vertical beam dumpCooling & Ventilation
RP Monitoring General ServicesContingency
n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 2011
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Slide54n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201154
Slide55Cost EAR-2n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201155
Slide56Cost Ear-2n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201156
Slide57Staff EAR-2n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201157
Slide58Staff EAR-2n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201158
Slide59Planning EAR-2n_TOF Collaboration/Collaboration Board Lisbon, 13/15 December 201159