LIPAc Grounding Network - ORNL · J.M. Ayala ARW 2015 9 . Existing neutron sources do not provide...

5th Accelerator Reliability Workshop Oak Ridge National Laboratory

Knoxville

LIPAc Grounding Network Requirements and functional description

Juan Marcos Ayala

IFMIF/EVEDA Project Team

LIPAc Grounding Network ARW 2015 J.M. Ayala 2

Outline

Introduction to LIPAc Description of LIPAc Features of LIPAc

Introduction to IFMIF/EVEDA Introduction to the Broader Approach Agreement LIPAc electrical background

Electrical Distribution: Outline diagram LIPAc grounding network: Outline diagram

LIPAc present status of installation activities


Introduction to LIPAc

LIPAc (Linear IFMIF Prototype Accelerator) is a 125 mA CW and 9 MeV deuteron beam Linac presently under installation in Japan

for a total beam average power of 1.125 MW

It will validate the concept the accelerator of IFMIF (International Fusion Material Irradiation Facility)

a 40 MeV deuteron beam Linac accelerator for fusion materials testing

LIPAc subsystems are delivered by in-kind contribution from European Laboratories under the Broader Approach (BA) agreement between Japan and Europe (EU)


Description of LIPAc

Injector + LEBT CEA Saclay

RFQ INFN Legnaro

JAEA Tokai MEBT CIEMAT Madrid

SRF Linac CEA Saclay

CIEMAT Madrid HEBT

CIEMAT Madrid BD CIEMAT Madrid

Diagnostics CEA Saclay

CIEMAT Madrid RF Power

CIEMAT Madrid CEA Saclay

SCK Mol

Rokkasho

Oarai

KNASTER, J. et al., Installation and Commissioning of the 1.1 MW deuteron prototype Linac of IFMIF, IPAC 2013 Shanghai

Equipment designed and constructed in Europe

Installed and commissioned in Rokkasho

J. Knaster Forum Nucléaire Suisse 9 February 2015

In 1999 LEDA (Los Alamos) reached 100 mA

continuous wave at 6.7 MeV protons at the exit of the RFQ

Many of the lessons learnt have been

implemented in LIPAc

LIPAC will accelerate: • 125 mA at 5 MeV CW deuteron beam at the

exit of the RFQ • 9 MeV CW deuteron beam at the exit of the

SRF Linac

This will validate the operation at higher energies for IFMIF

Features of LIPAc

SCANTAMBURLO, F. et al., LIPAc, the 125 mA/9 MeV CW deuteron IFMIF’s prototype accelerator: what lessons

have we learnt from LEDA?, IPAC 2014



IFMIF/EVEDA IFMIF

International Fusion Materials Irradiation Facility

EVEDA Engineering Validation & Engineering Design Activities

A fruitful Japanese- European International collaboration

with 7 countries involved with the involvement of research labs in Europe and main universities in Japan


The Design of IFMIF is broken down in 5 Facilities Accelerator Facility

Lithium Target Facility Test Facility

Post-irradiation and Examination Facility Conventional Facilities

to maximize dpas on tested materials the availability of the full IFMIF >70% has demanded careful RAMI analysis for each Facility

Enric and Jose Manuel know well about it…

Lithium TargetThickness 25±1 mm Flow speed 15 m/s

Test Cell

Li Dump tank

EMP

Dump TankTi Trap Cold trapY Trap

Impurity control system

Cooling water from /to

Conventional Facilities

EMP

Quench tank

Pump

Secondary Heat

Exchanger

Dump Tank

Pump

Tertiary Heat

Exchanger

Heat removal system

Primary Heat

Exchanger

Secondary oil loop

Tertiary oil loop

Main Li loop

RFQ

Ion source

LEBTMEBT

HEBTSuperconductingcavities

100 keV 5 MeV 9 14.5 26 40 MeV

Access Cell

Test Modules Handling

cells

Test Facility

Ancillary systems

Test Facility

Be Hot Cell Lab.

Tritium Hot Cell Lab.

Liquid Metal Lab.

Macrography Lab.

Microscopy Lab.

Hot Cell Laboratory

Post Irradiation Examination Facility

100 keV 5 MeV 9 14.5 26 40 MeVRFQ

Ion source

Superconducting

cavities

LEBTMEBT

Accelerator Facility

PIEF

Anc

illar

y sy

stem

sM

aint

enan

ce

syst

ems

RH systems

Test Modules

Target system

Lithium Target Facility

Conventional Facility

BuildingsSite General InfrastructuresPlant Services

AF Ancillary systems

LF Maintenance systems

LF Ancillary systems

EMFM

Lithium TargetThickness 25±1 mm Flow speed 15 m/s

Test Cell

Li Dump tank

EMP

Dump TankTi Trap Cold trapY Trap

Impurity control system

Cooling water from /to

Conventional Facilities

EMP

Quench tank

Pump

Secondary Heat

Exchanger

Dump Tank

Pump

Tertiary Heat

Exchanger

Heat removal system

Primary Heat

Exchanger

Secondary oil loop

Tertiary oil loop

Main Li loop

RFQ

Ion source

LEBTMEBT


100 keV 5 MeV 9 14.5 26 40 MeV

RFQ

Ion source

LEBTMEBT


100 keV 5 MeV 9 14.5 26 40 MeV

RFQ

Ion source

LEBTMEBT


100 keV 5 MeV 9 14.5 26 40 MeV

Access Cell

Test Modules Handling

cells

Test Facility

Ancillary systems

Test Facility

Be Hot Cell Lab.

Tritium Hot Cell Lab.

Liquid Metal Lab.

Macrography Lab.

Microscopy Lab.

Hot Cell Laboratory

Post Irradiation Examination Facility

100 keV 5 MeV 9 14.5 26 40 MeVRFQ

Ion source

Superconducting

cavities

100 keV 5 MeV 9 14.5 26 40 MeVRFQ

Ion source

Superconducting

cavities

100 keV 5 MeV 9 14.5 26 40 MeVRFQ

Ion source

Superconducting

cavities

LEBTMEBT

Accelerator Facility

PIEF

Anc

illar

y sy

stem

sM

aint

enan

ce

syst

ems

RH systemsRH systems

Test Modules

Target system

Lithium Target Facility

Conventional Facility



AF Ancillary systems

LF Maintenance systems

LF Ancillary systems

EMFM

Availability of the Facility >70%


14 MeV neutrons through stripping reactions

Neutrons would be mainly produced through their stripping from a deuteron beam

Li(d,xn) Accelerated deuterons would react with Lithium to generate neutrons in the forward direction typically with an energy 0.4 Einc

SERBER, R., The Production of High Energy Neutrons by Stripping, Phys. Rev. Vol. 72, No 1, December 1947

n deuteron


Existing neutron sources do not provide the needed answers 56Fe(n,α)53Cr and 56Fe(n, p)56Mn presents transmutation thresholds >3 MeV

Fission reactors n average energy ~2 MeV Spallation sources present a wide spectrum with tails in the order of hundreds of MeV Generation of light isotopes in the order of ppm

No efficient p+ or α-particle generation

Watt Distribution

(fission n spectrum)

Fission and spallation sources no fusion n relevant

10 J. Knaster Forum Nucléaire Suisse 9 February 2015

Introduction to the Broader Approach Agreement


Steady State Electrical Network: About 3.5 MVA continuous power Main consumers: • Cooling water system • Radio Frequency chains, HEBT, Cryoplant • Building services

Pulsed Power Electrical network: About 6 MVA peak pulse Main consumers: • Radio Frequency

LIPAc Electrical Distribution: outline diagram


LIPAc Grounding Network: outline diagram


LIPAc grounding network, scenario faced

Two independent grounding networks were installed The two grounding networks were unified possibly because of misunderstanding of the TN-S distribution system not frequent in Japan.

The impedance of the grounding network has not been assessed

The ground resistance is about 2,5 Ω

No specific EMC recommendations were observed


EU acceptance test conditions are not necessarily the same to those of the LIPAc installation:

The electro magnetic interference (EMI) environment is different The grounding network design in each EU Laboratory is different

Electrical power quality can be different

LIPAc grounding network, scenario faced

Thus EMC performance in LIPAc can be different…


LIPAc grounding network: Tackling uncertainties

Understand the problem EMI and EMC affects reliability. How? Common mode…. Leak currents, induced voltages, thunderbolts

Tackle uncertainties Know your grounding network Agree on standards to apply: IEC-61000-5-2 Create your own working guidelines and use them Upgrade your grounding network to cope with EMC Protect your electronics or be ready to lose them


Upgrading the grounding network Create a grounding network mesh or interconnect the chassis creating a mesh



Protect your electronics creating multiple paths for CM currents Intercept your signals close to the receiver



LIPAc Present status of installation

Ion source and LEBT under commissioning on p+ on-going Ion source and power supplies cooling skids are running RF power system (RFQ, MEBT and SRF Linac) starting June 2015

HV deck, ECR source Accelerator column LBET and Diagnostics


Conclusions

The Lipac commissioning has started at good progress The grounding network at Lipac will be updated to include EMC considerations The lack of an own EMC guideline makes it the usual excuse to explain faults, downtime and signal distorsion However, simple solutions can still be implemented to protect the electronics against the observed EMI issues


Thanks

Thank you for your attention

LIPAc Grounding Network - ORNL · J.M. Ayala ARW 2015 9 . Existing neutron sources do not provide...

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