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Contents
 Overview of Neutron Beam facilities of
HANARO
 Cold Neutron Guide Project
 Thermal Neutron Guide Project
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HANARO Reactor Hall
ENF
PGAA
RSI
NRF
HRPD
T-TAS
Bio-C
Bio-D
FCD
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•14 in operation
7 thermal: HRPD, FCD, RSI, NRF, ENF, PGAA , Bio-D
7 cold: 18M & 40M SANS, REF-V, DC-ToF, Bio-REF,
G-TS , KIST-USANS
•5 under commissioning
Th-TAS, Bio-C , Cold-TAS, C-PGAA, C-NDP
DS-TOF
18M-SANS
40M-SANS
Bio-REF
USANS
C-TAS
RDF-V
G-TS
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Overview of CNRF Project at HANARO
 Project : Establishment of infrastructure for cold neutron
research facilities at HANARO
 Project start : July. 2003
 Project end : May. 2010 (start of normal operation)
 Project objectives :

Development of a cold neutron source

Development of a neutron guide system

Development of five new spectrometers


40-m SANS, Cold-TAS, DC-TOF, HR-SANS, Guide Test Station
Re-location of three (3) spectrometers existing in the reactor hall

REF-V

Bio-REF

6m-SANS  18m-SANS
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Cold Neutron Guide system
 5 neutron guide(M=2) with different cross-section installed in the beam plug
starting at position with a distance of 1.84m from the cold source.
 After the beam plug filled with helium, the main rotary shutter located outside
the biological shielding operating with vacuum.
 After the main shutter, the guides start to curve, in order to remove the gamma
rays and fast neutrons having different curvatures. Two of the guides seperated
into 2 guides. (total 7 cold neutron guides)
The layout of the beam plug guides
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Cold neutron guide (detail)
Guide tubes at the reactor wall (to guide shielding room)
In-pile Plug
Removable Shielding
Guide
Guide tube in the beam tube
at the entrance position from
the cold source of 1.83m
Primary Shutter
Guide Support
Fig 4. Neutron Guide System
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Cold Neutron Instruments
•
•
Five new neutron scattering instruments had developed and installed in
the cold neutron guide hall, and three neutron instruments were moved
from reactor hall to guide hall.
The layout of the instruments in the cold neutron guide hall had been
determined throughout simulations to optimize the performance of each
instruments.
Guide
(dimension)
CG1
(20x150mm)
CG2
(50x150mm)
CG5
(50x150mm)
Curvature
Length of
curved part
Line of sight
+3.04
400m↗
26m
8m
800m↗
24m
17.9m
(40M-SANS)
350m↗
26.3m
11.8m
(Cold-PGA)
2500m↗
25.6m
24.5m
(DC-TOF)
2500m↗
32m
36.8m
***
600m↘
16m
15.5m
(Hr-SANS)
(Bio-REF)
(18M-SANS)
1500m↘
26m
31.4m
(Cold-TAS)
CG2A
(50 x 50mm)
CG2B
(50 x 95mm)
CG3
(30x150mm)
CG4
(50x150mm)
incline
angle
CG4A
(50x50mm)
CG5A
(50x150mm)
(Mirror-Test)
(V-REF) (NDP)
+2.03
+0.54
CG4B
(50x95mm)
Instrument
-0.93
-2.50
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Layout of cold neutron instruments
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Guide Hall
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Tracing Neutron Guide Performance
Cold neutron guide and cold source performance
have been traced at each cold neutron instruments
with measuring neutron flux.
Measured neutron intensity with a standard sample (silica) at 40M SANS
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Neutron guide fabrication


Sputtering : magnetron sputtering system (4 magnetron guns + ion gun)
Neutron guide of KAERI : M2 Supermirror, Reflectivity : 88% at critical angle
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Thermal Neutron Guide Project
 2014 : Planning project milestone
 2015~2016 : Preliminary conceptual design of ST1 beam plug, main
shutter and neutron guide shielding, High-M neutron guide
development
 2016 :Thermal neutron guide project proposal
 2017 : Project start
 2020 : Project end
 Project objectives :

Development of a thermal neutron guide system including neutron
guide production

Development of four new spectrometers



I-RSI, I-HRPD, T-NR, Raue diffractometer
Re-location of three (3) spectrometers existing in the reactor hall
Bio-C/D, RSI
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Neutron flux at beam port noses
Beam tube
Thermal neutron flux
< 0.625eV
ST1
1.89 x 1014
ST2
2.22 x 1014
ST3
2.24 x 1014
ST4
2.53 x 1014
CN
9.68 x 1013
NR
4.32 x 1013
IR
2.70 x 1014
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Thermal guide (beam port ST1)
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Reactor hall and guide hall
comm
Cold guide hall
Reactor hall
NR
In op
RSI, ENF
T-TAS
Thermal Guide
Bio-C, D
HRPD, FCD
Cold TAS
KIST-USANS
Bio-REF
18M SANS
GT-S
REF-V
CONAS
Length from beam nose to reactor wall : 14.47m
Length from reactor
wallbuilding
to thermal guide shielding wall : 30.3m
Aux
Length from beam nose to main shutter end : 5.7m
Total length form beam nose to thermal guide shielding wall : 44.47
Available total length for the curved guide : 38.77
Length of line of sight for a neutron guide with a width of 50mm
Curvature 1500m  31.4m
Curvature 2000m  33.8m
40M SANS
DC-TOF
Thermal neutron guide
 Some information for simulation
- Beam nose : f 88mm
- Neutron guide starting position : 1.78m from beam nose
- Neutron guides : 3 guides (50mmW x 150mmH)
- Neutron guide curvature :1500m
- Neutron flux at beam nose : 1.89x10 14 𝑛/𝑐𝑚 2 ∙ 𝑠𝑒𝑐
- Length of the 1st straight part of the neutron guide 3.94m
- Length of the curved neutron guide after the main shutter : 32m
- Length of the 2nd straight part of the neutron guide : 30m
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Thermal guide
 Neutron flux calculation
McSTAS(ver.2.1)
Measurement At main shutter
position
Neutron flux
Neutron flux
Neutron flux
Neutron flux
At curved guide
end
At straight guide
end
M=2 (SM for plug&main
M=2 (SM for curved
M=2 (SM for straight
shutter guide)
guide)
guide)
3.45E10 n∙cm 2 ∙sec
4.92E9 n∙cm 2 ∙sec
4.28E9 n∙cm 2 ∙sec
M=2
M=3
M=2
3.45E10 n∙cm 2 ∙sec
1.04E10 n∙cm 2 ∙sec
6.48E9 n∙cm 2 ∙sec
M=2
M=3
M=3
3.45E10 n∙cm 2 ∙sec
1.04E10 n∙cm 2 ∙sec
8.16E9 n∙cm 2 ∙sec
M=3
M=3
M=3
4.18E10 n∙cm 2 ∙sec
1.18E10 n∙cm 2 ∙sec
8.81E9 n∙cm 2 ∙sec
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Simulation result (M3M3M3)
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Simulation result
 Maxwell distributions of thermal neutrons at straight guide end position
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Simulation result (M2M3M3)
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Layout of thermal neutron guides
Cold neutron guide
Thermal neutron
guide
Thermal neutron instrument
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Summary
 Six cold neutron guides were successfully
installed and stabilized.
 Seven cold neutron instruments are operating
and open to domestic and international users.
 Three instruments are under commissioning
will and open next year.
 A proposal for development of thermal
neutron guides and thermal neutron
instruments will be submitted late 2016, and
the project will start in 2017.
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Thank you for your attention!!
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