v. parkhomchuk (binp, russia) -...
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THE ADVANCE TECHNOLOGY EXTRACTION FOR THERAPY IONS BEAM FROM CARBON STORAGE
RING WITH ELECTRON COOLINGV.V. Parkhomchuk, V.B. Reva, BINP, Novosibirsk-90,
Russia, 630090
V. Parkhomchuk (BINP, Russia)September 15,2011
Alushta, Ukraine
12–16 September, 2011
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AbstractThe electron cooling because of increasing the 6D phase space density of ion beams is the path for development compact accelerator ions beam therapy. The aperture magnets for the main synchrotron, the transport lines and the moveable ion gantry can be decreased very
fundamentally. The systems for the extraction ions will operate with the smaller aperture and the low fields that
improves reliability of dose control. The first experiments made at Landzow Institute of Modern Physics with
cooling carbon beam on the energy 200 and 400 MeV/uincreased enthusiasm of authors this report at these sort
of the therapy systems.
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CSRe cooler in IMP
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CSRe cooling carbon beam with energy 400 MeV/u, Je=1 ACenter initial injection Left and right evaluation Schottky spectra after changeElectron beam energy
Initial momentum spread
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neJe
1.6 10 19−⋅ π⋅ ae2⋅ c⋅ β⋅ γ⋅:= ne 7.244 106×=
λcool4 re⋅ ri⋅ ne⋅ c4⋅
V0i33⋅
3120
⋅:= τcoolγ
λcool:=
τcool 22.472=
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The ion beam current versus time whenprobe moved inside beam withvelocity 1 mm/sWithout cooling slow drop down ion beamCurrent With cooling al changing inside last mm.
Transverse profiles ion beamcalculated from scanning results
322 γπδνβε gNr ii=⊥
2.01.0 −≤δν
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1010=iN1.0=δν
The carbon beam emittance strongly function energy
for 7 Mev/u diameter 2 cm
but for the ion beam energy
400 MeV/u diameter only 2 mm
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Bunch beam cooling
0 0.2 0.4 0.6 0.8 1 1.20
1
2
3
4
time usec
sign
al fr
om p
icku
p V
3.341
0.1−
yk j,
1.0220 k dt⋅
Cooling tim
e
ION C(12)+6E=200 MeV/uJe=
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Initial moment bunch profile
Space charge waves at electron beam?
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At moment of maximal peak current
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History of cooling bunch beam
Initially very pure life time about 200 s and then the life timeup to 1000 s
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Electric fields inside bunch
The deformation of electric field gradient very significant
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Ion beam cooled up tospace charge limitation
• Transverse up to• Longitudinal up to
1.0≈Δ ⊥Q1/ ≈Δ ss QQ
Slow extraction of this dense beam with saving low emitanceare interesting scientific task.Especially for using at medicine application
ei
eiei M
mTT θθ *....... == For good design cooler Te->0
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Slow extraction with transformation high transverse
emittance of beam at beam with high longitudinal emittance but low
transverse
Fast extraction
Slow extraction
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3-ORDER RESONANCE EXTRACTION WITH COOLING
.
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3-ORDER RESONANCE EXTRACTION WITH COOLING
4 3 2 1 0 1 2 3 4
0.004
0.002
0
0.002
0.004
0.5 cm11.52.212.223549
x (cm)
vx (r
ad)
Single sextuplein the storage ringdivided the phaseplane spaceon stable-oscillation zoneand unstable-extraction zone
36.0=xν
.
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4 2 0 2 4 60.006
0.004
0.002
0
0.002
0.004
0.006
nu=0,36 S=2E-40.350.340.3351/3electrostatic septum knife position
x (cm)
vx (r
ad)
Modificationseparatrixwhen tunemoved to 1/3resonance
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2 2.2 2.4 2.6 2.8 35 .10 4
0
5 .10 4
0.001
0.0015
0.002
0.0025
0.003horizontal plan
x (cm)
vx (r
ad)
D1k1 1,
D1k1 1,D1k1 0, 0.8−
Fout−
⎛⎜⎝
⎞⎟⎠
10⋅
D1k1 0,
Extracted ion beamx*vx phase planeblue points the same butafter pass lens
(vy scale expanded 10 times
x*x’=2.0E-5 cm*rad
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The intensity extraction versustime:red- with constant tune tuneblue- with modulated tune feedback the extracted number
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The high cooling rate of the carbon beam can be obtainwith the perfect straightness magnet line at cooling section ionCooling time few msec!
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0 1 2 3 4 5 6300
200
100
0
100
time (msec)
volta
ge (V
)
U k
t k 1000⋅
0 1 2 3 4 5 61 .10 4
5000
0
5000
1 .10 4
time (msec)
indu
ctio
n at
Fe
(Gs)
B k
t k 1000⋅
SPLITING THE ION BEAM AT MOMENTUM SPACE
Using fast magnet for inductive shiftion beam energy
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Splitting the 400 MeV/u carbon beam at CSRe by hand manipulation the electron beam energy
Jump electron beam energy
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The experiment with extractionH0 atoms with energy 65 MeVon the nuclear emulsion detectordistance from cooler to film 10 mmark points space 1mm
Example of heavy ions extraction demonstrated at GSI:
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Main Ring
0
BU
M5
S1
DCCT
VAL5
VAL4
KES2SW
BU
M3
LUM
3
LUM2ESS
SQ
6
KES1
SQ
3HM
6M
6 -
ISM
LUM
1
SQ
1
PI 2
1 - B
PM21
PI 2
- BP
M2
V7
PI 1
- - B
PM
1
- B
PM
PI 1
1 -
PI 1
2 - -
BP
M
BC
PI 2
2 -
S3
BU
M6
SF
BU
MR
PB
PM
VA
L3
VA
L2
HM
1
HM2
M2 -
HM3M3 -
HM4M4 -
HM5
M5 -
M7
- HM
7
HM8
M8 -
HM9M9 -
M10 - HM10
HM11
M11 -
M12 - H
M12
BU
M2
BU
M4
V6
H13
RFC
VA
L8
VAL7
ESM
- BP
M22
QF1
4
V12
QD
14
BU
M1
V11BFM
KPI 20 - BPM20
QD13
V10
PI 19 - BPM19
QF12
S5
SQ5
PI 18 - BPM18
QD12
QF11PI 17 - BPM17
QF7
QD
6
SQ
2
VA
L1
QD
7 C
QD
9
QF8
QD
8
S4 QF9
SQ4
V8
QD11V9
PI 1
4 - B
PM14
QF10
VAL6
PI 16 - BPM16
PI 15 - BPM15
QD1
0
PI 1
3 - B
PM13
M1
-
V2PI
3 -
BPM
3
QD2
PI 5 - BPM5
V3QD3
PI 4
- BP
M4
QF3
QF4PI 6 - BPM6
QF6
QF5PI 7 - BPM7
V4QD4PI 8 - BPM8
S2
PI 9 - BPM9
SBRM
QD5V5
PI 10 - BPM10
QF1
3
QF2
KFM
QD
1
V1
QF1
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CONCLUSIONThe carbon ion beam system is based on a few approved key
innovations historically came from BINP (Novosibirsk) such as: electron cooling, using negative ions for stripping injection,
storage rings. Electron cooling helps to make operation of the system easier by decreasing the beam emittance which results in
stable ions energy and easy extraction. Example of CSRmoperation shows that electron cooler can stable operates many
months without any problems.
Thank you for attention
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