ESS-Bilbao Initiative Workshop. The CSNS rotating target concept and test programme.

CSNS Rotating target concept

CSNS target team

ESS-bilbao initiative
Bilbao Spain
March 16-18, 2009

Outline

• CSNS project overview

• CSNS project present status

• CSNS rotating target concept

Jia et.al, CSNS Rotating target, ESS-bilbao initiative , March 16-18, 2009

CSNS layout


Future of CSNS

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CPM plan and budget

• 6.5 years after ground breaking, 2 billion CNY (300 million USD)


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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


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.


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


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)


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).


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


The Conceptual Solution for the CSNS Rotating Target Disk
()
Complete with coolant
enclosure

with coolant enclosure
removed


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

Target dummy


Rotating shaft


Rotating shaft continue


Rotating shaft support


Support bearing


Shaft support (Segmented lower radial bearing )


lower radial bearing


Rotating joint


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Mock-up running report

• Leakage from rotation union 1 l/month ( not good)

• Temperature at stationary ring of bearing 50 C (RT)

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• 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)


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


Target Station Overview


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

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?)


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


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

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


Geometry of three moderators configuration


Spectra from three moderators


Pulse Peak Intensity


CHM Surface Intensity Distribution (all energy)

Target side


DWM Surface Intensity Distribution (100meV)

Target side


DPHM broad side Surface Intensity Distribution (10meV)

Target side


ESS-Bilbao Initiative Workshop. The CSNS rotating target concept and test programme.

ESS-Bilbao Initiative Workshop. The CSNS rotating target concept and test programme.

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