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Power Supply activities at SOLEIL

Power Supply activities at SOLEIL. F. BOUVET. 3rd POCPA Workshop, 21-23 May 2012, DESY. Our main objectives for 2012 - 2014. SOLEIL power supplies and pulsed systems: Improvement of the equipment reliability Enhancement of the equipment availability Improvement of the performances of SOLEIL

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Power Supply activities at SOLEIL

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  1. Power Supply activities at SOLEIL F. BOUVET 3rd POCPA Workshop, 21-23 May 2012, DESY

  2. Our main objectives for 2012 - 2014 • SOLEIL power supplies and pulsed systems: • Improvement of the equipment reliability • Enhancement of the equipment availability • Improvement of the performances of SOLEIL • New power supply needs linked to the Storage Ring modification • New operating modes • Collaborations in which SOLEIL is engaged • Realisation of the compact X-ray source THOM-X • Know-how licence contract in the Pulsed Magnet Systems field with SIGMAPHI • Collaboration SOLEIL / MAX-4 • Collaboration with the international synchrotron light source SESAME (Jordan) • Participation in new projects • LUNEX-5 project  X-ray source of 5th generation

  3. Equipement reliability • Maximize the reliability of our equipement: • Preventive maintenance (Tightening of power connexions (every year), replacement of fans, electrolytic capacitors, etc…) • Systematic analysis of breakdowns • Corrective maintenance • Surveillance of equipment performances (PS current ripple, tracking error between Booster PS currents, current shape & jitter of pulsed systems, periodic verification of the value of the stored beam residual bump induced by the pulsed magnets at SR injection, …) % user beam unavailability vs scheduled beam time

  4. Equipement availability • Maximize the availibility of our equipement  Spares • Enhancement of the user beam availability constitutes a major target of the SOLEIL Sources and Accelerator Division for the coming years • Reasonable redundancy in major equipment is one of the keys to achieve the goal • Strategy originally set up for spare parts:  purchase complete equipment for low power devices (like quadrupole or corrector power supplies)  only spare parts for the main components and/or subsystems (IGBT assembly, …) in the bigger systems (like sextupole or dipole PS) Of course repairing such systems can take a long time depending on the failure complexity: SOLEIL experienced many hours of beam interruption in October 2008 (48 hours) or November 2009 (24 hours) during repairs of the Storage Ring dipole PS

  5. Equipement availability • To prevent this, it has been decided to build in-house a new power supply for the Storage Ring dipole magnets • In the event of a breakdown, the idea is to switch the dipole magnet chain from the power supply which is out of order to the spare power supply • This operation will take less than 15 minutes, thus avoiding long beam interruptions • Decision to build this PS in-house motivated by 3 considerations: • Reduced cost (no manpower-related costs) • Maintenance/development of the group member skills • Construction of a more reliable PS as compared to the existing unit which presents some design faults • PS specifications: • 580A / 610V Load: 1.05Ω ; 3.4H • Current resolution and stability (over 24 hours) respectively 5ppm and 10ppm of the nominal current • Efficiency: Above 95% at nominal power

  6. Equipement availability • Spare dipole power supply Changeover switch Buck converter

  7. Equipement availability • Spare dipole power supply • Topology based on 2 interleaved step-down converters switching @ 10kHz • Digital regulation • using a PSI digital control unit • The spare dipole PS will be in operation on the machine in September Control module

  8. Equipement availability • Other developments: • Mid-2012 – Mid-2013: In-house construction of a spare power supply (~ 50kW) for the 10 sextupole power supplies of the Storage Ring • 2013 – 2014: We plan to build a spare unit for some insertion device power supplies (~ 70kW) • For PS tests & repairs: • Since 2010: Realisation of several test benches • Purchase of a 70kW resistive test load (variable R)

  9. New power supply needs • New « long » beamlines • A 2,200 m2 extension to the SOLEIL experimental hall is currently under construction to accomodate 2 long (160m & 200m) beamlines dedicated to state of the art hard X-ray nano-imaging techniques. The photon sources of these 2 new beamlines are 2 in-vacuum undulators which have been installed in the same long straight section of the Storage Ring. The optics of this section has been changed with the introduction of new magnets. Needed PS for these magnets: - 2 PS 275A / 17V ± 5ppm + 3 PS 275A / 27V ± 5ppm+ 4 PS 10A / 5V ± 50ppm(+ spares) built in-house in 2011 - 3 power supplies 150A/50V ± 5ppm  Will be built in-house in 2013

  10. New power supply needs • Femto-second e- beam Slicing project (2012-2013) • Goal: Provide 100fs long pulses of soft and hard X-rays with a reasonable flux and a 1-10kHz repetition rate • 4 power supplies will be needed + 1 spare • We are waiting for specifications… • Interaction inside a wiggler of a laser beam ultra-short pulse with an e- bunch •  energy modulation of the electrons within a short section of that bunch (slice). Using non-zero dispersion sections, this slice gives 2 transversely separated satellites which will radiate in an undulator located downstream.

  11. Improvement of SOLEIL performances • Reduction of the stored beam residual bump @ Storage Ring injection •  Active correction in V plane under study •  Study of injection scheme on axis • by a pulsed multipole magnet • New project part of the collaboration with MAX-4 • Results in 2010 (Target = 10% beam size): • These results are excellent but the target is not completely met Thick septum residual bump H-plane  bump ~10 μm pk V-plane  bump ~8 μm pk

  12. New operating modes 5-10 mA 390 mA in 312 bunches • Low-alpha operating mode •  Production of short bunches. Bunch length = 4.8ps • For THz and X-ray short buch science • Pseudo-Single Bunch mode • = special hybrid mode in which the isolated • bunch is orbiting on a different closed orbit. Implementation of a new optics on the machine requiring the power supply polarity reversal of 24 quadrupoles and 2 sextupole chains  Installation of the polarity inverters Purpose: Satisfy simultaneously two user communities for time resolved experiments (like in single bunch operation) & high flux/brilliance experiments (like in multibunch operation) A fast kicker system (pulses of ~1ns) operating at a high repetition rate (1kHz-1MHz) is required to kick the isolated bunch on a different vertical closed orbit  Realisation in 2013 - 2014

  13. Collaborations • THOM-X Project (Orsay, France) • Labs involved: LAL / SOLEIL / C2RMF / CELIA / INSERM / Néel / ESRF + industrial partner Thales • New hard X-ray source based on Compton Back Scattering • Very compact source, which can produce an intense X-ray flux (1012-1013 ph/s) • Applications: Medical science (imagery & therapy) and cultural heritage preservation (museum) • The demonstrator construction phase has started • Realisation of the injection pulsed systems • (2012-2014) • - Design of the pulsed magnets: • 1 in-vacuum eddy current septum + 2 very fast • kickers (with their ceramic vacuum chambers) • - And their pulsed power supplies • DC power supplies: • About 50 PS ranged from sev. tens of W to sev. tens of kW • 2012-2014: Specs + call for tenders + acceptance tests + installation Kicker current pulse shape challenging

  14. Collaborations • THOM-X Project (Orsay, France)

  15. Collaborations • Knowledge transfer to Industry • Know-how licence contract in the Pulsed Magnet Systems field has been signed in December 2009 with the French company SIGMAPHI (ΣΦ), involved in the design and manufacturing of magnets for accelerators. • End 2009: Design for ΣΦ of an innovative solution for the call for tender concerning the injection and extraction kicker systems of an antiproton and ion decelerating ring (FAIR facility, Germany) • Challenge: Produce high current pulses with variable amplitude, rise time and flat top duration • 2011-2012: Design, tests and validation of the pulsed power supply • Intellectual property currently under discussion with ΣΦ

  16. Collaborations • Collaboration MAX-4 / SOLEIL – « MIK » • MAX-Lab laboratory (Lund, Sweden) is building a new synchrotron radiation facility MAX-4, replacing the existing laboratory consisting of the MAX-1, 2 and 3 Storage Rings. • Purpose: Production of synchrotron radiation with optimal characteristics in a wide energy region, fulfilling the needs of most diverse research areas. • Collaboration agreement with Max-Lab to develop their 2 multipole injection kicker (MIK) systems  2012 – 2013 • As the « Non-Linear Kicker » principle recently developped at BESSY-II seems to be a promising solution, we have proposed to associate BESSY-II in this collaboration. Courtesy of P. Kuske, BESSY-II On-axis kick experienced by the stored beam should ideally be zero

  17. Collaborations • SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East) • First international 3rd generation synchrotron light source in the Middle East region (Jordan) • Under construction near Amman (Jordan), under umbrella of UNESCO • Members: Bahrain, Cyprus, Egypt, Israel, Iran, Jordan, Pakistan, Palestinian Authority, Turkey • Purpose: Foster excellent science and technology in the Middle East (and prevent or reverse the brain drain) + Build bridges between diverse societies, and contribute to a culture of peace through international collaboration in science • Collaboration between SESAME & SOLEIL engaged since 2007

  18. Collaborations • SESAME • 2010-2011: Support to the SESAME team for • The Booster equipment electrical distribution • 1Hz Power supplies (manufactured by BRUKER): Bid analysis, design review, factory & site acceptance tests • Booster pulsed systems: Tests of the systems coming from BESSY-I  diagnosis of equipment condition 2012-2013: Support for the Booster commissioning Tracking error between power supply currents: ± 2. 10-3

  19. New projects LUNEX-5: A free electron laser project towards the 5th generation in France Labs involved:SOLEIL / ESRF / LAL / LOA / CEA / LCPMR / PhLAM Objectives: • Investigation of the production of short intense and coherent pulses in the soft X rays region with 4th generation light scheme on a conventional linear accelerator • Probing the potentialities of a so-called 5th generation light source using a laser wake field accelerator and seeded FELs • 2011: Participation in the CDR phase • About 70 PS are needed, ranged from sev. tens of W to sev. tens of kW • 2012: R&D phase on transport LWFA, cryo-ready undulator, fs synchronization, diagnosis, …

  20. Questions • Thank you for your attention. • Questions ?

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