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Introduction - CLIC klystron modulator studies at CERN

Introduction - CLIC klystron modulator studies at CERN . Davide Aguglia 8 th of December 2011. CLIC studies & klystron modulators specs. ~1600 klystron Modulators required here. Pulse efficiency definition. CLIC studies goal: Demonstrate technical feasibility

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Introduction - CLIC klystron modulator studies at CERN

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  1. Introduction - CLIC klystron modulator studies at CERN Davide Aguglia 8th of December 2011

  2. CLIC studies & klystron modulators specs ~1600 klystron Modulators required here Pulse efficiency definition • CLIC studies goal: • Demonstrate technical feasibility • Full scale kly. mod. prototypes required • Resources + time schedule = Mandate! • Some financial resources for feasibility demo + realisation of 2 protos for 2016 (2018?) • Collaboration needed to improve resources & expertises for this challenging project! ~300MW required for kly. mod. CLIC studies on klystron modulators technical meeting

  3. R&D philosophy - @ CERN vs. collaborations Again, global design approach! The R&D process needs a global approach to the system! Need for partners in specialized fields Each partner doesn’t have global view on project &/or expertises in all required fields CERN (EPC/FPC) has to coordinate R&D with partners / keep up to date with spec changes / gather expertises and methodologies for evaluation and for sharing them with other partners CERN must be the center of R&D program – buying solution not permitted – collaboration for optimal results is the solution! Specifications from grid and from klystrons What are the specs for each modulator sub-components? CLIC studies on klystron modulators technical meeting

  4. Current R&D @ CERN–Fellows' work • Goal for R&D @ FPC: provide missing specs for modulators’ sub-components design! Let’s illustrate the concept with an example: • Fellows’ work: • Generally • provide models, methods to help deriving specifications for modulators sub-components • Specifically • Pulse-to-pulse reproducibility of SMPC (Rudi) • Power quality on utility grid studies (Eleni) • Questions to be answered (samples) • What is the charger voltage reproducibility? • Compromises between charger voltage reproducibility & power quality? Results will be useful to every partner! CLIC studies on klystron modulators technical meeting

  5. Pulse-to-pulse reproducibility challenges • 10ppm of pulse-to-pulse reproducibility! (100ppm maybe) A real challenge…currently we are not even able to measure this! • Open or closed voltage loop operation? • If voltage measurements are not reproducible, better not to close the loop! • If control electronics not reproducible, better not to close the loop! One solution is to foresee an open voltage loop operation – in either cases the open loop reproducibility of the power converters (charger and PFS) must be estimated for any topology!!! … Rudi’s work! Many phenomena can influence the reproducibility of a power converter, for SMPC we are studying the influence of switches jitter on reproducibility. CLIC studies on klystron modulators technical meeting

  6. Power quality issues • General layout selection (1) Division by LV sectors How many of them? power quality respected at this level • Is this layout optimal? • Can each charger meet utility grid specifications? • (as you will see this depends on PC bandwidth) What are in this case the design compromises to be considered? Eleni’s work! CLIC studies on klystron modulators technical meeting

  7. Power quality issues • General layout selection (2) • What if we don’t meet the utility grid specs at the charger level? • What kind of Energy Storage Systems (ESS) is most suitable? • Where to place ESSs?...LV, MV • How many of them? CLIC studies on klystron modulators technical meeting

  8. Power quality issues • General layout selection (3) • What about LV Active Front Ends (AFE)? • Do they have enough bandwidth to provide constant power consumption? • Do we need high bandwidth step-up DC/DC converters? • How to select the LV level? • What is the AFE bandwidth vs. voltage level? CLIC studies on klystron modulators technical meeting

  9. Power quality issues • General layout selection (4) Typically main capacitor bank nominal voltage around 5kV – 15kV • What about connecting the modulators directly to MV (~17kV – 20kV) via AFEs? • Can we imagine HVDC lines to supply several PFS? • Can we imagine HVDC lines to supply several PFS? • Do we need ESSs and SVCs to compensate for poor MV AFEs bandwidth & harmonics production? CLIC studies on klystron modulators technical meeting

  10. Power quality issues To find a globally optimal solutions for power quality improvements, extended knowledge on AFEs, ESSs & SVC technology is required. These knowledge go beyond FPC expertise and before starting an external collaboration, do we have the resources in EPC? HPC… MPC…

  11. Rudi, Eleni, you have the floor! CLIC studies on klystron modulators technical meeting

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