A THOUGHT ON

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15 Νοε 2013 (πριν από 3 χρόνια και 10 μήνες)

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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


# P @ 100MeV INJECTION

1.7 10
13


INJECTED PARTICLE


H
-



PARAMETERS
cont.


CIRCUMFERENCE




224.15 m


LATTICE STRUCTURE



FODO


# CELLS






20


Q
X

,Q
Y






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

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


偓䕕䑏D㈰⁆佌䐠
SYMMETRY


EASY TO CREATE FAST INJECTION FAST BUMP


EASY TO CREATE EXTRACTION SLOW BUMP




Parameters


RCS lattice

Circumference (m)

223.824

Lattice structure

FODO

Number of cells

20

Super
-
period

4

Tunes of Q
X

/Q
Y

4.39/4.29

Transition

4.4

Number of dipole

32

Dipole field at 1 GeV (T)

0.56

Quadrupole Tip field (T)

0.56

Power supply type

Resonant

RF harmonic number

2

Required RF voltage at 30
Hz

45 kV

g


Large aperture
quadrupole (a = 17cm): 12



Normal aperture
quadrupoles (a = 11cm): 28

LATTICE FUNCTIONS

INJECTION

EXTRACTION

RF

RF

ES SEPTUM SLO EXT

SLO EXT SEPTUM

SUPER PERIODE

Q1

Q2

Q3

Q4

Q5

Q6

NAMING SCHEME

MOMENTUM

COLLIMATION

BETATRON

COLLIMATION

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


POWER UPGRADE PATH

K$
BNL TOTAL
134,983



TOT R&D
5,244



R&D
86071
R&D
5,098


TARGET
86340C
TARGET(CLOSED)
2


CONTROLS
86341C
CONTROLS(CLOSED)
144



1
129,739



1.1
6,201



1.1.3
5,115


1.1.3.1
86401C
LATTIC ACCLELERATOR
891


1.1.3.2
86402C
INJECTION AND EXTRACTION
1,899


1.1.3.3
86403C
RF AND BEAM DIAGNOSTICS
1,394


1.1.3.4
86404C
BEAM SCRAPPING & COLLIMATION (CLOSED)
931


1.1.3.5
86405C
FOIL FACTORY(CLOSED)
-


1.1.3.6
86406C
MACHINE CODE(CLOSED)
0



1.1.4.2
86491C
(CLOSED)
90



1.1.5
86410
150


MAGNET

SIZE

HxWxL(RxL)

FIELD*L

T@2GeV

KAMP
-
TURN

@2GeV

L

mH

DIPOLE

22X50X200

.9119

159.65

4.277

QD2,4

12X30.40

-
4.0529

36.26

1.143

QF1,5

12X30.74

4.0979

36.26

1.156

QD6,10

12X25.90

-
3.4532

36.26

.974

QD8

12X34.74

-
4.6332

36.26

1.307

QF3

17X41.30

3.8864

49.71

5.789

QF7,9

17X48.64

4.5778

49.71

4,915

TABLE OF MAIN MAGNETS




LC
f
1
2


0

Z
when

L

L

C

C



Z
AC +DC

DC

AC

TRADITIONAL RESONANT POWER SUPPLIES

MAGNET STRING

MAGNET STRING

CHOKE

CHOKE

MAGNET STRING

CHOKE

MAGNET STRING

CHOKE

AC DC

AC DC

AC DC

DC

MAGNET STRING

CHOKE

DC

MAGNET STRING

CHOKE

AC

Structure of BM Network

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


AC
Lch/2
Rch/2
Rm1
Lm1
Cm
Cch/2
Cch/2
Rch/2
Lch/2
Lm2
Rm2
DC
- DC +
AC PS
c
L
M
L
M
L
M
L
M
L
M
L
M
L
M
L
ch
L
ch
L
ch
L
ch
L
ch
L
ch
c
c
c
c
c
c
c
L
ch
L
ch
L
M
Structure of QM network

C
C
(AC+DC)
PS
L
m
C
L
m
L
m
L
m
L
m
L
m
L
m
L
ch
L
ch
L
ch
L
m
L
ch
L
ch
L
ch
L
ch
C
C
C
C
L
m
C
ch
L
ch
R
m
R
ch
AC+DC
C
m

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

SYSTEM

DIPOLE

12cm QUAD

17cm QUQD

#TURNS/POLE

12

12

24

#MOD.

8

1

1

#MAG/MODULE

4

4 x 7

4 x 3

L / MODUL

17.11 mH

31.4 mH

65.97 mH

I
DC
(1/2GeV) KA

2.557/3.857

1.224/1.846

.612/.923

I
AC
(1/2GeV) KA

1.495/2.795

.715/1.337

.358/.669

V
AC
(1/2GeV)KV

2.410/4.507

2.117/3.958

2.224/4.158

C m
-
F

6.580

3.585

1.707

L
CHOKE
mH

18

32

66

C
CHOKE

mF

6.254

3.518

1.706

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

MAGNET STRING

MAGNET STRING

AC DC

AC DC

SLOW BEAM RUNNING REQUIRES A SHORTING SWITCH

ACROSS THE CAPACITORS

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

SAMPLE VIEW OF THE STRANDED COIL


COUTESY CSNS

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

THE CROSS SECTION OF THE COIL

IS RATHER LARGE BECAUSE

IT HAS TO CARRY BOTH

DC AND AC CURRENTS

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

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

AC

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