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A THOUGHT ON RCS. Y Y LEE BROOKHAVEN NATIONAL LABORATORY (RETIRED). RCS PARAMETERS. INJECTION ENERGY100~200MeV REPETTION RATE15 ~ 60Hz EXRACTION ENERGY1 ~ 2GeV BEAM POWER44 ~800 KW ADMITTANCE560 mm.mr BEAM EMITTANCE 200(280) mm.mr LASLETTE TUNE SHIFT.2

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A THOUGHT ON RCS

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A THOUGHT ONRCS

Y Y LEE

BROOKHAVEN NATIONAL LABORATORY

(RETIRED)


RCS PARAMETERS

  • INJECTION ENERGY100~200MeV

  • REPETTION RATE15 ~ 60Hz

  • EXRACTION ENERGY1 ~ 2GeV

  • BEAM POWER44 ~800 KW

  • ADMITTANCE560 mm.mr

  • BEAM EMITTANCE 200(280) mm.mr

  • LASLETTE TUNE SHIFT.2

  • # P @ 100MeV INJECTION1.7 1013

  • INJECTED PARTICLEH-


PARAMETERS cont.

  • CIRCUMFERENCE224.15 m

  • LATTICE STRUCTUREFODO

  • # CELLS20

  • QX ,QY4.39/4.29

  • TRANSITION g4.4

  • DIPOLE FIELD @1 GeV.56 T

  • QUADRUPOLE TIP FIELD 0.8 T MAX

  • # DIPOLES32

  • POWER SUPPLY TYPERESONANT

  • RF HARMONIC2

  • RF VOLTAGE REQUIRED @ 15Hz 45 KV


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


Parameters – RCS lattice

  • Large aperture quadrupole (a = 17cm): 12

  • Normal aperture quadrupoles (a = 11cm): 28


LATTICE FUNCTIONS


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


POWER UPGRADE PATH

STAGEINJ. E EJE,E REP. RTRFPOWER

MeV GeV HzKVKW

INNITIAL100 1 15 4558

IMP. I100 1 3090116

IMP. II100 2 30130 232

IMP. III100 2 60260464

IMP. IV200 2 60260899


TABLE OF MAIN MAGNETS


TRADITIONAL RESONANT POWER SUPPLIES

L

C

L

when

C

MAGNET STRING

MAGNET STRING

DC

AC +DC

CHOKE

CHOKE

AC


MAGNET STRING

MAGNET STRING

AC DC

AC DC

AC DC

CHOKE

CHOKE

MAGNET STRING

MAGNET STRING

DC

DC

CHOKE

CHOKE

AC


Structure of BM Network

24 meshes BM resonant network with separated AC & DC power supply


Structure of QM network

8 QM families with combined AC & DC power supply


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


INNITIQL STAGE 15 Hz OPERATION


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


15 Hz

30 Hz


SLOW BEAM RUNNING REQUIRES A SHORTING SWITCH

ACROSS THE CAPACITORS

MAGNET STRING

MAGNET STRING

AC DC

AC DC


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!!!!


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


EXAMPLE CALCULATIONS AT CSNS

COURTESY CSNS


ALTERNATE WAY TO POWER THE RCS

EACH MAGNETS HAVE TWO SETS OF COILS

ONE DC

ONE AC


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


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


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


THANK YOU


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