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A THOUGHT ON RCS

A THOUGHT ON RCS. Y Y LEE BROOKHAVEN NATIONAL LABORATORY (RETIRED). RCS PARAMETERS. INJECTION ENERGY 100~200MeV REPETTION RATE 15 ~ 60 Hz EXRACTION ENERGY 1 ~ 2 GeV BEAM POWER 44 ~800 KW ADMITTANCE 560 mm.mr BEAM EMITTANCE 200(280) mm.mr LASLETTE TUNE SHIFT .2

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A THOUGHT ON RCS

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  1. A THOUGHT ONRCS Y Y LEE BROOKHAVEN NATIONAL LABORATORY (RETIRED)

  2. RCS PARAMETERS • INJECTION ENERGY 100~200MeV • REPETTION RATE 15 ~ 60 Hz • EXRACTION ENERGY 1 ~ 2 GeV • BEAM POWER 44 ~800 KW • ADMITTANCE 560 mm.mr • BEAM EMITTANCE 200(280) mm.mr • LASLETTE TUNE SHIFT .2 • # P @ 100MeV INJECTION 1.7 1013 • INJECTED PARTICLE H-

  3. PARAMETERS cont. • CIRCUMFERENCE 224.15 m • LATTICE STRUCTURE FODO • # CELLS 20 • QX ,QY 4.39/4.29 • TRANSITION g 4.4 • DIPOLE FIELD @1 GeV .56 T • QUADRUPOLE TIP FIELD 0.8 T MAX • # DIPOLES 32 • POWER SUPPLY TYPE RESONANT • RF HARMONIC 2 • RF VOLTAGE REQUIRED @ 15Hz 45 KV

  4. LATTICE PHILOSOPHY • FOUR FOLD SYMMETRY • DISPERSION FREE LONG STRAIGHT • SHORT STRAIGHT WITH DISPERSION TO MOMENTUM COLLIMATION • LONG STRAIGHT CAN ACCOMMODATE RF FOR 2 GeV AND 60 Hz FUTURE UPGRADE • MINIMUM BUT ADEQUATE CELL LENGTH TO ACCOMMODATE INJECTION(@200MeV AND EXTRACTION@2GeV ~5 m • REGULAR FODO STRUCTURE  PSEUDO 20 FOLD SYMMETRY • EASY TO CREATE FAST INJECTION FAST BUMP • EASY TO CREATE EXTRACTION SLOW BUMP

  5. Parameters – RCS lattice • Large aperture quadrupole (a = 17cm): 12 • Normal aperture quadrupoles (a = 11cm): 28

  6. LATTICE FUNCTIONS

  7. NAMING SCHEME INJECTION D7,8 Q10 D5,6 Q9 ES SEPTUM SLO EXT Q8 D3,4 Q7 D1,2 Q6 Q5 Q4 RF Q3 RF Q2 SUPER PERIODE Q1 BETATRON COLLIMATION SLO EXT SEPTUM MOMENTUM COLLIMATION EXTRACTION

  8. POWER UPGRADE PATH STAGE INJ. E EJE,E REP. RT RF POWER MeV GeV Hz KV KW INNITIAL 100 1 15 45 58 IMP. I 100 1 30 90 116 IMP. II 100 2 30 130 232 IMP. III 100 2 60 260 464 IMP. IV 200 2 60 260 899

  9. TABLE OF MAIN MAGNETS

  10. TRADITIONAL RESONANT POWER SUPPLIES L C L when C MAGNET STRING MAGNET STRING DC AC +DC CHOKE CHOKE AC

  11. MAGNET STRING MAGNET STRING AC DC AC DC AC DC CHOKE CHOKE MAGNET STRING MAGNET STRING DC DC CHOKE CHOKE AC

  12. Structure of BM Network 24 meshes BM resonant network with separated AC & DC power supply

  13. Structure of QM network 8 QM families with combined AC & DC power supply

  14. POWERING SCHEME FOR 15Hz RUNNING • LIMIT THE AC VOLTAGE TO BE <5KV • 4 DIPOLES IN EACH MODUL INNITIALLY • ALL 12cm QUADRUPOLES IN ONE STRING • ALL 17cm QUADRUPOLES IN ONE STRING • THE CHOKES AND CAPACITERS FOR EACH MODULE SHALL BE DIVISIBLE BY 4 • DC SUPPLIES HAVE VOLTAGE CAPABILITY TO RUN SLOW EXTRACTED BEAM OPERATION

  15. INNITIQL STAGE 15 Hz OPERATION

  16. UPGRADE TO 30Hz ALL MODULE COMPONENTS MAGNETS, CHOKES AND CAPACITORS SPLIT INTO TWO DOUBLE THE POWER SUPPLIES 16 DIPOLE SUPPLIES 2 12cm QUADRUPOLE SUPPLIES 2 17cm QUADRUPOLE SUPPLIES UPGRADE TO 60 Hz ALL COMPONENTS BE SPLIT FURTHER INTO TWO RE DOUBLING THE NUMBER OF SUPPLIES

  17. 15 Hz 30 Hz

  18. SLOW BEAM RUNNING REQUIRES A SHORTING SWITCH ACROSS THE CAPACITORS MAGNET STRING MAGNET STRING AC DC AC DC

  19. COIL CONSTRUCTION CONSIDERATION • STRANDED WIRES AROUND COOLING PIPE • HOLLOW COPPER CONDUCTOR • EDDY LOSS---SOME CASES ITS LARGER THAN RESISTIVE LOSS • ONLY A PART OF EDDY LOSS IS POWER LOSS FROM POWER SUPPLY • REST ARE MARE HEAT LOSS • ENOUGH COOLING TO OVERCOME EDDY LOSS • EDDY LOSSES ARE CONCENTRATED AROUND THE POLE • COULD WE LAMINATE THE CONDUCTORS? • NEED OPTIMIZATION STUDY!!!!

  20. IN ORDER TO AVOID SIGNIFICANT POWER LOSS DUE TO EDDY CURRENTS AND RESISTIVE LOSS THE CROSS SECTION OF THE COIL IS RATHER LARGE BECAUSE IT HAS TO CARRY BOTH DC AND AC CURRENTS SINCE THE EDDY LOSS IS PROPORTIONAL TO THE SQUARE SURFACE AREA OF THECONDUCTOR SOPHISCATED STRANDED COIL MANUFACTURING IS NEEDED A SMALLER STANDARD COPPER COIL MAY BE USED BUT NEED TO HAVE MANY MORE TURNS THUS INCREASED INDUCTANCE SAMPLE VIEW OF THE STRANDED COIL COUTESY CSNS

  21. EXAMPLE CALCULATIONS AT CSNS COURTESY CSNS

  22. ALTERNATE WAY TO POWER THE RCS EACH MAGNETS HAVE TWO SETS OF COILS ONE DC ONE AC

  23. DC,AC DC,AC AC DC AND AC CIRCUITS ARE SEPARATED BUT ARE COUPLED BY TRANSFORMER ACTION OF THE MAGNET DC CIRCUIT ALSO HAVE AC CAPABILITY TO BUCK THE VOLTAGE INDUCED BY THE COUPLEING OF THE COIL—NO AC POWER ELIMINATE MUTUAL INDUCTANCE WILL HAVE SOMEWHAT MORE RESISTIVE LOSS DUE TO SMALLER AC COIL

  24. ADVANTAGES ELIMINATED THE CHOKES AND HALF THE CAPACITORS ONLY ONE RESONANT SYSTEM TO DEAL WITH NO SHORTING SWITCHS ARE NEEDED FOR SLOW EXTRACTED BEAM RUNNING SMALLER AC COIL TO REDUCE EDDY LOSS ie LARGER DC CONDUCTOR CAN BE USED TO SAVE POWER SIMPLER COIL CONSTRUCTION DISADVANTAGES SOMEWHAT LARGER OHMIC LOSS EXTRA AC POWER SUPPLIES

  25. SUMMARY POWERING SCHEM FOR THE PEFP RCS IS DEVELOPED WITH EASY WAY TO DOULBE AND QUADRUPLE THE REPETITION RATE POSSIBILITY OF CONSTRUCTING EDDY SHIELDS ARE PROPOSED POSSIBILITY OF ALTERNATE WAY OF POWERING HAS BEEN EXPLORED FOR CONVENIENT WAY TO SWITCH BETWEEN RCS AND SLOW EXTRACTED RUNNING DETAILED “OPERA” CALCULATION TO EVALUATE THE SCHEME IS NEEDED

  26. THANK YOU

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