7. CPM plan and budget
• 6.5 years after ground breaking, 2 billion CNY (300 million USD)
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
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Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
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Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
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Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
13. 2 RCS
Ring injection and extraction magnet and power supply:
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Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
15. 4 Instrument
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Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
18. Summary of Main Advantages of a Rotating Target
• Longevity - expectation is one target for the life of the facility
– Reduced waste; independence of W-price development and manufacturer;
high availability of facility; reduced life cycle cost.
• Radiation damage independent of horizontal bam profile
• No attached hot cell needed for replacement (if at all necessary)
– Substantial cost savings; better utilization of building
• Reduced coolant activation; easier water loop
• Wear parts (bearings, drive and rotating union) can be replaced
hands on.
• More neutron beam ports
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
19. RD on rotating target concept (CSNS mock-up test stand)
• Test the validity of this concept and to gain first experience
with a rotating target.
• Provide first demonstration of the viability of the above concept
by using a full model of the target head components and shaft
and a dummy target with the right diameter and weight;
• Confirm that acceptance criteria can be reached;
• Gain experience in running a rotating target;
• Verify certain parameters obtained by calculations.
• To produce a sound basis for a decision as to whether or not
CSNS wants to adopt a rotating target as the preferred solution.
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
20. Rotating target mock-up
Dummy target
5
Long shaft 4
Shaft support Helium 3
enclosure
Rotating joint
Driven unit 2
Cooling system 3
Test stand
1
Measurement protons
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
21. CSNS Rotating Target Mock-up Stand
• Use dummy disk of correct diameter and weight (adjust
thickness)
• Short circuit coolant flow in the disk with orifice to simulate
pressure drop (allows replacement with “real” prototype)
• Keep full length of shaft accessible to allow varying position
of lower radial bearing
• Use gear box and cardan joint to connect to motor
• Use variable speed motor to explore range of revolution
frequencies (0.5 – 5Hz)
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
22. Uses of Test Stand
• Use Test Stand to practice exchange of target bearing and
rotating union.
• Practice greasing of bearing
• Test stand can be used to develop position monitoring for target
disk, spill water recovery, monitoring of bearing, etc.
• At a later stage replace lower bearing support plate by target plug
inner shielding block with integrated lower bearing.
• If available, replace dummy target by assembly demonstration
target (SS or Al-alloy)
• The final target can be tested for tightness and smooth running
on the test stand (acceptance criteria).
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
23. Acceptance Criteria for Mock-up
• Leakage from rotation union 1 l/month
• Temperature at stationary ring of bearing 50 C
• Vibration amplitude at shaft transition 1mm
• Lateral force on lower bearing 10 kg
• Vertical deflection at outer edge of target disc
1mm
• Horizontal deflection at circumference of target
1mm
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
24. The Conceptual Solution for the CSNS Rotating Target Disk
()
Complete with coolant
enclosure
with coolant enclosure
removed
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
25. The Conceptual Solution for the CSNS Rotating Target Disk
Involute shaped segments with grooves on surface
Target shaft
Hub
(transition
Tie bolts Rotating target window
piece)
Upper target container plate welded to hub → requires similar materials
Upper and lower plate of inner disk have different shapes → check effect on cost
Lower target container plate not supported in centre → check for deformation
Check Al-hub (temperature) in case of loss of coolant
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
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Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
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36. Mock-up running report
• Leakage from rotation union 1 l/month ( not good)
• Temperature at stationary ring of bearing 50 C (RT)
v
v
vv
• Vibration amplitude at shaft transition 1 mm (0.4mm )
• Lateral force on lower bearing 10 kg (1kg)
• Vertical deflection at outer edge of target disc
1mm (0.15 mm)
• Horizontal deflection at circumference of target
1mm (0.4 mm)
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
37. CSNS
Drive unit
Block house
Water feed and
Target plug
support unit
(ca 60 cm Ø)
Outer
(concrete)
shielding
Reflector
Proton
beam
Plug for
Inner (steel) shielding neutron
guides
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
39. Target Plug Reflector and shield cooling
(in series for each side)
Two half-shells around target shaft,
Bolted together and attached to target
plug top plate
Tie rods
Target
Consider square
shield
cross section for
central
central target shield
cylinder 3,5 m
Stacked plates
openings in
Target plug vessel to
vessel make
Cooled shielding connections
(vertically segmented)
Upper reflector
(vertically segmented)
Approx. weight (3, 5 m high)
55x55 square block: 8.3 t
(55cm diam. cylinder: 6.5 t)
55 cm
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
40. Vertical Insertion of Target and Upper Moderator
Upper
moderator Design for segmented upper target
plug
plug (ca 2 m) to reduce weight for lift
Outer liner Top lid
Inner liner
Target
Lower
and upper
reflector
plug reflector
shielding
Target plug
plug
subdivided
≈ 4m
into sector-
segments
in upper
Inlet plate for lower region
reflector cooling
(premod?)
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
41. Schematic Plan View of the Target Block
cold thermal
Reflector
Moderator
plug
Add on
Removable
Proton beam shielding for
shield plug for
neutron
tunnel
guide bundle
guide bunker
Storage for Target
radioactive or plug
cold
spare plugs thermal
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
42. Possible Arrangement of Buildings
possible extension
User and User and
experiment experiment control
control rooms rooms
(2nd and 3rd floor) (2nd and 3rd floor)
Target and
instrument
hall
possible
extension for
neutron guide
hall
Fast neutron
station ca 40 m
Utility rooms on upper floor
Shielded bunker on ground floor
possible (intermediate active storage)
extension
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
43. Rotating target neutronics Dr. Liang Tianjiao
• 3 moderators
• Upper moderator: Decoupled poisoned Hydrogen (20k) and
Water Moderator,
• Lower moderator: Coupled Hydrogen Moderator (20k)
• Be + SS304 reflector
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
44. Geometry of three moderators configuration
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
45. Geometry of three moderators configuration
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
46. Geometry of three moderators configuration
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
47. Geometry of three moderators configuration
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
48. Geometry of three moderators configuration
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
49. Spectra from three moderators
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009
50. Spectra from three moderators
Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009