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

CSNS Rotating target concept

CSNS target team

ESS-bilbao initiativeBilbao Spain

March 16-18, 2009

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

Outline

• CSNS project overview

• CSNS project present status

• CSNS rotating target concept


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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Outline

• CSNS project overview

• CSNS project present status

• CSNS rotating target concept


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


R&D 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

� Long shaft

� Shaft support

� Rotating joint

� Driven unit

� Cooling system

� Test stand

� Measurement 1

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protons

Helium enclosure


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��

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

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• 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

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The Conceptual Solution for the CSNS Rotating Target Disk

Upper target container plate welded to hub → requires similar materialsUpper and lower plate of inner disk have different shapes → check effect on costLower target container plate not supported in centre → check for deformationCheck Al-hub (temperature) in case of loss of coolant

Involute shaped segments with grooves on surface

Target shaft

Rotating target window

Hub (transition piece)Tie bolts


Target dummy


Rotating shaft


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Rotating shaft support


Support bearing


Shaft support (Segmented lower radial bearing )


lower radial bearing


Rotating joint


Driven system

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Mock-up running report

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

• Temperature at stationary ring of bearing < 50

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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 � � � � ��

Proton beam

Inner (steel) shielding

Outer (concrete) shielding

Block house

Plug for neutron guides

Water feed and support unit

Drive unit

Reflector

Target plug (ca 60 cm Ø)


Target Station Overview


Target Plug

Two half-shells around target shaft,Bolted together and attached to target plug top plate

Upper reflector(vertically segmented)

Cooled shielding(vertically segmented)

Target plug vessel

Stacked plates

Target shield central

cylinder

Consider square cross section for

central target shield

Reflector and shield cooling(in series for each side)

Approx. weight (3, 5 m high) 55x55 square block: 8.3 t(55cm diam. cylinder: 6.5 t)

3,5 m

openings in vessel to

make connections

55 cm

Tie rods


Outer liner

Inner linerTarget and upper reflector plug

Upper moderator plug

Vertical Insertion of Target and Upper Moderator

≈ 4m

Design for segmented upper target plug (ca 2 m) to reduce weight for lift

Target plug subdivided into sector-segments in upper region

Top lid

Inlet plate for lower reflector cooling (premod?)

Lower reflector plug shielding


Schematic Plan View of the Target Block

Reflector

Add on shielding for neutron guide bunker

cold

cold thermal

thermal

Moderator plug

Target plug

Removable shield plug for guide bundle

Proton beam tunnel

Storage for radioactive or spare plugs


Possible Arrangement of Buildings

Target and instrument

hall

possible extension

possible extension

Fast neutron station

User and experiment

control rooms(2nd and 3rd floor)

User and experiment control rooms(2nd and 3rd floor)

possible extension for neutron guide

hall

Utility rooms on upper floor Shielded bunker on ground floor

(intermediate active storage)

ca 40 m


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


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


Rotating target thermal hydraulic

MM MM

100KW, stationary targetNN NN

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TU V P QR STU V P QR STU V P QR STU V P QR S

Tmax = 243 C WW WW Tout= 28 C

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100KW, rotating target)


Temperature distribution

Tmax = 54 C WW WW Tout= 28 Ccoolant flow coolant pressure

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thermal hydraulic

MM MM

100KW, stationary and rotating target)

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Temperature

The shell and target rotate at a speed of 3.14rad/s

Tmax = 142 C WW WW

Tout= 41.5 CCoolant flow coolant pressure


Unsteady simulation:

variation of target from rotating to rest


Technology

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