lecr5 development and status report...32+ ≥ 50 eua the requirement of the ecr ion source ecris c....

C. Qian - ECRIS2020, MSU, 1

LECR5 Development and Status ReportC. Qian1,2, L. T. Sun1,2, Z. H. Jia1,3, W. Lu1, L. B. Li1,2, X. Fang1, J. W. Guo1, J. J. Chang1, J.

R. An1, J. D. Ma1, H. Wang1, Y. M. Ma1, Y. C. Feng1, X. Z. Zhang1, and H. W. Zhao1,2

1)Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China2)School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing

100049, China3)School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China

E-mail address: [email protected]


Design of LECR5

Testing setup and Platform construction

Commissioning for Ion Beams• Gaseous ion beams production• Metal ion beams production

Summary

Outline


Design of LECR5



Summary

Outline


Background introduction

DTL + RFQ

Synchrotron0.28 ~ 2.8 T·m

MEBT

HEBT

LEBT

Space Environment Simulation Research Infrastructure (SESRI)Heavy Ion Energy 8 ~ 85 MeV/u (Proton Energy100 ~ 300 MeV)

Ions Current Ion energy NRMS

H2+ ≥250 euA

4 keV/u

≤0.24He2+ ≥200 euA

≤0.1584Kr18+ ≥84 euA209Bi32+ ≥50 euA

The requirement of the ECR ion source

ECRIS


Ions Charged State LAPECR2 (eμA) LECR3-14.5 GHz (eμA) LECR4-18 GHz (eμA)40Ar 8+ 310 1100 1717

9+ 200 720 1075

11+ 105 325 503209Bi 28+ 45 207Pb30+/18 118

31+ 20 70

Design considerations of ECRIS

• All permanent Magnet ECRIS and 14.5 GHz room temperature

ECRIS can’t meet the requirement of the bismuth ion beam.

• High performance 18 GHz room temperature ECRIS can meet all ion

beam requirements.

Beam intensity produced by two types of typical ECRIS in IMP


Design parameters of LECR5

LECR5 LECR4 SECRAL(18 GHz)f (GHz) 18 18 18Binj (T) ≥2.5 2.4 2.5

Bmin (T) 0.33~0.53 0.53 ~0.5Bext (T) ≥1.2 1.3 1.4Brad (T) ≥1.2 (r=40) ~1.0 (r=38) 1.4 (r=63)

Mirror length 340 mm 307 mm 420 mmPlasma Chamber 80 mm 76 mm 126 mm

Design parameters in comparison of other ECRIS

The magnetic field configurations of the LECR5 are similar for those

of SECRAL operating at 18 GHz.

• Injection and radial magnetic field as high as possible.

• The minimum magnetic field in the middle can be adjusted.

• Plasma chamber as large as possible.


Layout structure of LECR5

Extraction CoilsInjection Coils

Middle Coils for Bmin

Hexapole Magnet(Halbach-36 blocks)

L: 620 mm

D: 640 mm

Insert Iron for Binj

Φin=88 mmΦout=188 mm


Design of LECR5



Summary

Outline


Source Assembly of LECR5Injection component Plasma Chamber and

Hexpole MagnetPlasma Electrode

Screening Electrode andGround Electrode

Axial Coils

Insulating Layer


Radial magnetic field of LECR5

-1.3

-1.1

-0.9

-0.7

-0.5

-0.3

-0.1

0.1

0.3

0.5

0.7

0.9

1.1

1.3

0 40 80 120 160 200 240 280 320 360Br (T

)

Angle(°)

R=40 mm Measurement Dates


Axial magnetic field of LECR5

0.00

0.50

1.00

1.50

2.00

2.50

3.00

0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340

Bz

(T)

Z (mm)

1300-500-1200-Caculation

1300-500-1200-Measurement

Insert Iron

100%

Plasma Electrode


Testing Platform of LECR5

LECR5Solenoid

Dipole

Beam Diagnostic


Beam optical design of Testing PlatformHV=8 kV, I0= 1.5 emA, H2

+＝500 euA, SSC=70%Beam spot size X emittance Y emittance

HV=26.125 kV, I0= 5.0 emA, Bi32+＝65 euA, SSC=70%Beam spot size X emittance Y emittanceBeam spots position


Performance Testing of LECR5Data:01-18-2020

0

500

1000

1500

2000

2500

0 0.5 1 1.5 2 2.5

Beam

Inte

nsity

(eμA

)

Microwave Power (kW)

LECR4 SECRAL@18 GHz

Testing conditions:

•Heating frequency: 14.5 +18 GHz

•Plasma chamber material: Stainless steel

•Plasma Electrode Aperture: Φ8 mm

•Screening Electrode Aperture: Φ16 mm

•FC Negative Biased Voltage: -150 V

O6+

LECR5 has demonstrated its performance.


Design of LECR5



Summary

Outline


Gaseous Ion Beams Production385eμA-40Ar12+

0

20

40

60

80

100

120

140

160

180

200

90 95 100 105 110 115 120 125 130

Beam

Inte

nsity

(eμA

)

Dipole Current (A)

23+

HV=28 kV, I0=2.64 emASV=-0.9 kV, IS=0 emAP18GHz=1.5 kW, 23+Iq=73 eμA

24+25+

26+

22+ 21+ 20+ 19+18+

17+

O3+/16+O4+O5+

15+

Optimizing the production of highly charged krypton ion beams

Tuning Conditions:• Heating frequency: Single 18 GHz• Plasma chamber material: Stainless steel• Plasma Electrode Aperture: Φ8 mm

• Screening Electrode Aperture: Φ16 mm• FC Negative Biased Voltage: -150 V


Gaseous Ion Beams Production338eμA-129Xe20+

145eμA-129Xe27+

Optimizing the production of highly charged xenon ion beams

0

50

100

150

200

250

300

350

400

100 110 120 130 140 150 160

Beam

Inte

nsity

(eμA

)

Dipole Current (A)

HV=28 kV, I0=4.31 emASV=-0.9 kV, IS=0 emAP18GHz=1.5 kW, 27+Iq=145 eμA

17+18+19+20+21+22+23+

25+26+

27+

28+

29+30+

31+

O4+ O3+/24+ O2+/16+

16+

Tuning Conditions:• Heating frequency: Single 18 GHz• Plasma chamber material: Stainless steel• Plasma Electrode Aperture: Φ8 mm

• Screening Electrode Aperture: Φ16 mm• FC Negative Biased Voltage: -150 V


Gaseous Ion Beams Production

LECR5 has the potential to produce intense highly charged ion beams.

Ions Charged State LECR5(eμA)18 GHz＜2 kW

LECR4(eμA)18 GHz＜2 kW

SECRAL(eμA)18 GHz ＜3.2 kW

16O 6+ 2120 21107+ 458 560

16Ar 11+ 521 62012+ 385 430 51014+ 121 185 27016+ 25 23 73

86Kr 18+ 22020+ 12023+ 7326+ 32

209Xe 20+ 338 430 50523+ 263 27526+ 200 205 41027+ 145 135 30628+ 104 92

Gaseous ion beam results of LECR5 in comparison with other ECR ion sources


Intense highly charged Ion beam Emittance

HV=28 kV, Io=4.31 emA, 129Xe27+=145 eμA

H: 0.1(nrms) V:0.11(nrms)


Metal Ion Beams ProductionMicro-oven

Off-line test results

Micro-Oven 2D Section

Tuning Conditions:• Heating frequency: 14.5 +18 GHz• Plasma chamber material: Aluminum• Micro-oven port Aperture: Φ4 mm• Plasma Electrode Aperture: Φ8 mm• Screening Electrode Aperture: Φ16 mm• FC Negative Biased Voltage: -150 V


0

10

20

30

40

50

60

98 103 108 113 118 123 128 133 138 143 148

Beam

Inte

nsity

(eμA

)

Dipole Current (A)

HV=25 kV, I0=1.28 emASV=-0.4 kV, IS=0.22 emAP18GHz=1.8 kW, P14.5GHz=0.26 kW41+Iq=22 eμA,

2527

2829

303132

3334353637

3840

414243

4445

4647

48

O4+ O3+ O2+

49

Optimizing the production of highly charged bismuth ion beams

LECR5 can produce highly charged heavy ion beams.

Metal Ion Beams Production


81eμA-Bi32+

41eμA-Bi36+

Ion Beam Spots with different charged state.



Ions Charged State LECR5(eμA)14.5+18 GHz＜2.2 kW

LECR4(eμA)18 GHz＜2 kW

SECRAL(eμA)18 GHz ＜3.2 kW

209Bi 30+ 119 191

31+ 101 92 150

32+ 81 63

41+ 22 22

45+ 12.5 1550+ 3.8 1.5

Bismuth ion beam results of LECR5 in comparison with other ECR ion sources

X:0.07(nrms) Y:0.09(nrms)



Commissioning for project requirements

Ions Intensity（eμA） X (nrms) Y (nrms)H2

+ 266＞250 0.14＜0.2 0.15＜0.24He2+ 204＞200 0.15 ≤ 0.15 0.14＜0.15

84Kr18+ 88＞84 0.09＜0.15 0.11＜0.15209Bi32+ 51＞50 0.05＜0.15 0.05＜0.15

Results of ion beams commissioning in comparison with requirements

SlitX=12mmSlitY=12mm




H2+ 4He2+ 84Kr18+ 209Bi32+


LECR5 Milestone and Status

02. 2016 ─ Project proposed, called LECR5-SESRI.

07. 2018 ─ Final Overall design finished.

07. 2019 ─ Overall assembly and first beam analyzed at IMP.

04. 2020 ─ LECR5-SESRI commissioning for intense highly

charged ion beams.

Next: Ready to transport to Harbin, Commissioning with RFQ.


Design of LECR5


Commissioning for ion beams• Gaseous ion beams production• Metal ion beams production

Summary

Outline


Summary

1. A high performance 18 GHz room temperature ECR ion source was

successfully constructed.

2. Some outstanding results of highly charged ion beams have been

produced.

3. Excellent quality of intense heavy ion beam has been obtained.

Better results will be obtained by further optimizing conditions:

1. Multi-frequency heating.

2. Higher microwave power up to 3 kW.


谢谢！Thanks for your attention!

lecr5 development and status report...32+ ≥ 50 eua the requirement of the ecr ion source ecris c....

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