rcs

0TH ORDER CONCEPTUAL DESIGN: 

0TH ORDER CONCEPTUAL DESIGN RAPID CYCLING SYNCHROTRON FOR PROTON ENGINEERING FRONTIER PROJECT YY LEE. BC CHUNG and YS CHO

CONCEPT: 

CONCEPT AS A POSSBLE EXTENSION TO THE 100(200) MeV LINAC SPALLATION NEUREON SOURCE OF 87KW INNITIALLY EXPANDABLE UP TO 800KW THROUGH 4 STAGES OF IMPROVEMENT CONSTRUCTION AND IMPROVEMENT CAN BE DONE IN STAGES TO ACCOMMODATE BUDGETARY CYCLE

Slide7: 

WHY PULSED NEUTRONS ONE CAN CHOOSE THE ENERGY OF THE NEUTRON

PARAMETERS: 

PARAMETERS INJECTION ENERGY 100~200MeV REPETTION RATE 30(15) ~ 60 Hz EXRACTION ENERGY 1 ~ 2 GeV BEAM POWER 87(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-

PARAMETERS cont.: 

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 MATCH WITH DIPOLE # DIPOLES 32 POWER SUPPLY TYPE RESONANT RF HARMONIC 2 RF VOLTAGE REQUIRED @ 30Hz 90(45) KV

LATTICE PHILOSOPHY: 

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

IMPROVEMENT PATH: 

IMPROVEMENT PATH STAGE INJ. E EJE,E REP. RT RF POWER MeV GeV Hz KV KW INNITIAL 100 1 15 45 44 IMP. I 100 1 30 90 87 IMP. III 100 2 30 130 174 IMP. III 100 2 60 260 350 IMP. IV 200 2 60 260 800

Slide12: 

SNS ACCUMULATOR RING

Slide13: 

SNS LATTICE FUNCTION

Slide14: 

Magnet layout in a super-period Achromatic arc 90o phase advance per cell High dispersion region with missing dipoles Dispersion free straight section at both ends

Slide15: 

Lattice structure - superperiod

Slide16: 

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

Slide17: 

Schematic layout of RCS ring

Slide18: 

Injection layout 2.6 Kgauss 7.17Kgauss *at 200MeV inj.

Slide19: 

Double dipole

Slide20: 

Double Septum

Slide21: 

Narrow open quadrupole

Slide22: 

6 cm 11.8cm 7 mr

Slide23: 

Correlated painting Anti-correlated painting

Slide24: 

Correlated painting with/without space charge

Slide25: 

Anti-correlated painting with/without space charge

Slide26: 

INJECTION USE CORELATED PAINTING ONLY 200p mm.mr 280p mm.mr PAINT LONGER AT THE DEGES TO ACCOMMODATE EXPANDED PHASE SPACE

Slide27: 

MAGNETIC CYCLE

Slide30: 

RESONANT SUPPLY WITH DC BIAS

Slide31: 

RESONANT SUPPLY WITH AC+DC

Slide32: 

POSSIBLE AC SUPPLY SCHEME

Slide33: 

EXTRACTION REGEON F D F D F LAMBERTSON SEPTUM FULL APERTURE KICKER 83 mm 40 mm orbit bump

Slide34: 

EXTRACTION REGEON F D F D F LAMBERTSON SEPTUM FULL APERTURE KICKER 42 mm 42 mm orbit bump

SUMMARY AND CONCLUSION: 

SUMMARY AND CONCLUSION SPALLATION NEUTRON SOURCE WITH PROTON POWER OVER ½ MEGAWAT IS EXPLORED CAN BE STAGED FROM 45 KW IN 4 STEPS TO 800KW FOUR FOLD SYMMETRIC FODO STRUCTURE RAPID CYCLING SYNCHROTRON WITH ADEQUATE INJECTION AND EXTRACTION SCHEME IS POSSIBLE SO FAR NO ENGINEERING DIFFICULTIES WERE UNCOVERED NOTE THAT AGS ACCELERATED OVER 1013 PROTONS WITH 200MeV INJECTION IN 50mm.mr ADMITTANCE WHAT THIS MACHINE CAN DO?