Report on the Status C Weiss 28112013 EAR2 Beam Line Report on the Status 1 28112013 EAR2 Beam Line Report on the Status 2 Beam Dump EAR2 Exp Hall 2 nd Collimator Magnet Pit Shielding ID: 300799
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Slide1
EAR2 Beam LineReport on the Status
C. Weiss
28.11.2013
EAR2 Beam Line - Report on the Status
1Slide2
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2
Beam Dump
EAR-2 Exp. Hall
2
nd
Collimator
Magnet
Pit Shielding
Target
New Area
Existing Area
1
st
Collimator
Filter Box
S
hielding
Service Gallery
ISR Tunnel
h
[m]
0
9.8
18.1
24.4
EAR1Slide3
Beam Line - Design Considerations
Exchangeable components in order to allow new target installation (2018).
Minimum background to the experiment.
Maximum neutron fluence to the
experiment.Acceptable dose rate in working area close to beam
line (0.5 mSv/h in ISR
).
Maximum
flexibility for experiment
installation (capture &
fission setup
).Automatic alignment with neutron beam.
Feasibility :-)!28.11.2013EAR2 Beam Line - Report on the Status
3Slide4
Vacuum chambers
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EAR2 Beam Line - Report on the Status
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Special vacuum chamber at the beam dump with inserted shielding material (avoid backscattered neutrons).
Target
Special vacuum chamber at the 2
nd
collimator, to allow the insertion of the collimator and
to optimize shielding.
Special vacuum
chamber to get as close as possible to the
target and allow material irradiations close to target.
SiMon
: carbon
f
ibre
v
acuum
chamber(LNS / INFN).Slide6
n_TOF Target from the Top
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EAR2 Beam Line - Report on the Status
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Opening on top of the spallation target structure
EAR2 TOF tube goes through there Slide7
Vacuum Chamber 18.9 m total
length:‘Triangular’ shape for the first 1.1 mCylindrical shape (d = 317.9 mm) from top of target onwards
Window: 1.5 mm Al, concave shape 12 mm gap of air btw. target and window
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EAR2 Beam Line - Report on the Status
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Production on-going
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Vacuum chamber 1Slide9
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EAR2 Beam Line - Report on the Status
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New
guidings
for irradiation on target
Basket Ø160
Vacuum chamber 1Slide10
Collimators
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EAR2 Beam Line - Report on the Status
10Slide11
Collimators
Decisions on beam parameters:
n_TOF
coll. meeting May – capture beam
n_TOF tech. meeting in Sept. – fission beam
2nd collimator: 2 m Fe + 1 m PE (with B or Li)1
st
collimator: 1 m Fe
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EAR2 Beam Line - Report on the Status
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Measurement
Collimator & Shape
Inner Diameter [mm]Capture2nd: conicald2 = 20
d1 = 691st: cylindricald0
= 200Fission2nd: conicald2 = 85.6d1
= 124.6Slide12
1st Collimator
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Shutter replaced with vacuum chamber
Collimator
1:
1 m Fe
d
inner
= 200 mm
(will be inserted in vacuum chamber 1)
MagnetSlide13
PE
(+B or Li)
c
ore
260 kg
1.5 m
2 m
1 m
Steel core
2 t
Steel vacuum vessel
5 t
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2
nd
Collimator Slide14
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2
nd
Collimator
Multiple-step design
as conical is not
machinable
!Slide15
Beam line shielding
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EAR2 Beam Line - Report on the Status
15Slide16
Additional shielding
layer
on the floor of EAR2
for background reduction.
Steel balls above service gallery.
1.5 m concrete right above service gallery.
Fe
collar at the level of 1
st
collimator.
Concrete
around beam pipe up to service gallery.
h
[m]
0
9.8
18.1
Target
Service GallerySlide17
Service Gallery
Section 1
Section 2
Section 3
Section 4
Shielded Pit
Section 1
Section 2
Centering
pins
Section 3
Section
4
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EAR2 Beam Line - Report on the Status
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TargetSlide18
New Concrete
S
hieldings
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Steel forms for concrete taps
Green light for production
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Concrete Tap
B
locksSlide20
1.5 m
2 m
1 m
St steel balls 3 t (0.6m³)
Concrete 1.1 t
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20
Shielding
above
Service GallerySlide21
Service Gallery - Magnet and filter box
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Magnet and Filter Box
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Filter Box
Permanent Magnet: 0.2 Tm
r
eady by end 2013
1
st
collimator in ‘storage position’
Ducts for steel ball removalSlide23
Filter Box
*
Proposed by
E.
Berthoumieux
, F. Gunsing
and C.
Lederer
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Filter
EAR1
AvailableEAR2Proposedd [mm]Cd*
✗0.5Ag
✔0.5W
*✔0.8
Mo*
✔
1Co*
✔
0.25Na*
✗10Al*
✔ / ✔
30 / 80S*✗
80
C
✔
60Slide24
Filter Box
EAR2: 276 mm available length, each filter:
350 x 350 mm
2
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Filter
EAR1
Available
EAR2
Proposed
d [mm]
Cd*✗?0.5
Ag
✔✔0.5
W*✔
✔
0.8Mo
*
✔
✔1Co*
✔✔
0.25Na*
✗✔10
Al*
✔
/
✔
✔ / ✗
30 / 80S*
✗
✔
80C
✔
?
60Slide25
Filters: Transmission Probabilities
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Beam dump
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Beam Dump28.11.2013
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Design constraints:
Background situation in EAR2 (
n_TOF
)
Dose rate outside (Radioprotection)
Maximum weight (Civil
E
ngineering)
Outer dimensions
(to be confirmed by RP):Concrete: 3.2 x 3.2 x 2.4 m3Iron: 1.6 x 1.6 x 1.6 m3Slide28
Beam Dump Entrance28.11.2013
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Vacuum chamber Ø200
Borated polyethylene
Borated polyethylene
Concrete block
Gap 60mm
Alignment accuracy to be defined!
Al window (300
m
m)Slide29
Experimental area
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Additional Shielding in EAR2
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Additional shielding below beam dump.
Additional shielding above 2
nd
collimator
= false floor (20 cm).
C6D6 detectors in FLUKA.Slide31
Capture Setup
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SiMon
and sample exchanger (INFN) included in model.
Support for sample exchanger to be modified (less material, detector closer to sample).
Beam-line reductions before and after sample not included yet.
Small
Kapton
windows planned before and after sample (like in EAR1).
Valve below
SiMon (vacuum + safety).Additional shielding not included yet (false floor + below beam dump).Slide32
Capture Setup
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Vacuum Valve
1 m from beam centre to pillarsSlide33
Capture + Fission Setup
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Top part of the beam line will have to be dismantled before the crane can be used.
Vacuum chamber with inserted shielding different for capture and fission => also needs to be removed when changing the collimators.Slide34
From Capture to Fission(and reverse!)
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Vac. chamber + shielding in roof
To be dismantled and remounted:
Beam Line + Detectors
2
nd
Collimator
False Floor = Shielding
1
st
Collimator in Service Gallery!
4-5 days!Slide35
6Li or 10B
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EAR2 Beam Line - Report on the Status
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InvestigationsUse
6Li(n,a)
3H instead of 10
B(n,a)
7Li for 2nd collimator and all shielding material in
EAR2.Cross-section of 6Li(
n,
a
)
3
H
is 4 times smaller than 10B(n,a)7
Li – higher neutron background expected.See presentation of Silvia for details about the simulations.Available material: 7.5
% natLithium-Polyethylene.Material properties: machinable like normal PE, no safety issues reported.Budget: Approximately 10 000 Euros for 1 m3
.28.11.2013EAR2 Beam Line - Report on the Status
36Slide37
Conclusions
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ConclusionsProduction
started for various elements:Vacuum chamber 1All needed bellows
Magnet (almost ready)To be decided:
Filters (proposed: Ag, W, Mo, Co, Na, Al, S)
10B or 6Li
Monitoring system (capture)Error margins for beam dump alignmentSafety margins for vacuum chambers inside EAR2
To Do:
Supports (detectors, sample exchanger, etc.)
Equipment in EAR2 (tools, sources, etc.)
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Master Mind Sylvain Girod
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What have we forgotten?Thank you for your attention!
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Backup
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1.5 m
2 m
1 m
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Collimator 2
Material
Thickness 20 mm
Gap 60 mm
Minimum aperture Ø320 mm
Pit Ø800 mm
175 mm available for chicanes on radius
.
(Here 3x58mm)
Maximum gap: 2mmSlide43
Additional shielding
layer at the floor of EAR2
for background reduction
Steel balls above service
gallery
1 m Concrete right above service galleryFe + Concrete wall in ISR
tunnel
Fe
collar at the level of 1
st
collimator
Concrete
around beam pipe up to service gallerySlide44
1
st
Collimator:
Removal
The green shielding is brought above the collimator with
a trolley on the rails
The collimator is lifted inside the green shielding with
a hoist
The rails guide the trolley to the storage position
The collimator is lowered in the storage pit
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Hoist 0.5t