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

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.

CSRe cooler in IMP

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

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=

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

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

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=

Initial moment bunch profile

Space charge waves at electron beam?

At moment of maximal peak current

History of cooling bunch beam

Initially very pure life time about 200 s and then the life timeup to 1000 s

Electric fields inside bunch

The deformation of electric field gradient very significant

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

Slow extraction with transformation high transverse

emittance of beam at beam with high longitudinal emittance but low

transverse

Fast extraction

Slow extraction

3-ORDER RESONANCE EXTRACTION WITH COOLING

.

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

.

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

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

The intensity extraction versustime:red- with constant tune tuneblue- with modulated tune feedback the extracted number

The high cooling rate of the carbon beam can be obtainwith the perfect straightness magnet line at cooling section ionCooling time few msec!

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

Splitting the 400 MeV/u carbon beam at CSRe by hand manipulation the electron beam energy

Jump electron beam energy

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:

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

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