Multi Beamlett Extraction Experiments and Sector

Magnet Field Investigation

Platform Ground

Pulsed Extract Power

Supply

Extraction Electrode,

Coldbox and Analysing Magnet all

Pulsed

+

17kV-

Platform DC Power Supply

35kV

Post Extraction

Acceleration Gap

Laboratory Ground

+-

18kV

35keV H- Beam

Profile Measurements for Different Extraction Voltages

2.5

mA/cm2

2.0

1.5

1.0

0.5

0.0

17 kV Extraction Voltage

35 kV Platform Voltage

18 kV Post Acceleration Voltage

47 mA Beam Current

355 mm downstream from ground plane of post acceleration gap

2.5

mA/cm2

2.0

1.5

1.0

0.5

0.0

16 kV Extraction Voltage

35 kV Platform Voltage

19 kV Post Acceleration Voltage

42 mA Beam Current

355 mm downstream from ground plane of post acceleration gap

2.5

mA/cm2

2.0

1.5

1.0

0.5

0.0

15 kV Extraction Voltage

35 kV Platform Voltage

20 kV Post Acceleration Voltage

40 mA Beam Current

355 mm downstream from ground plane of post acceleration gap

2.5

mA/cm2

2.0

1.5

1.0

0.5

0.0

14 kV Extraction Voltage

35 kV Platform Voltage

21 kV Post Acceleration Voltage

38 mA Beam Current

355 mm downstream from ground plane of post acceleration gap

2.5

mA/cm2

2.0

1.5

1.0

0.5

0.0

13 kV Extraction Voltage

35 kV Platform Voltage

22 kV Post Acceleration Voltage

35 mA Beam Current

355 mm downstream from ground plane of post acceleration gap

2.5

mA/cm2

2.0

1.5

1.0

0.5

0.0

12 kV Extraction Voltage

35 kV Platform Voltage

23 kV Post Acceleration Voltage

32 mA Beam Current

355 mm downstream from ground plane of post acceleration gap

2.5

mA/cm2

2.0

1.5

1.0

0.5

0.0

11 kV Extraction Voltage

35 kV Platform Voltage

24 kV Post Acceleration Voltage

28 mA Beam Current

355 mm downstream from ground plane of post acceleration gap

2.5

mA/cm2

2.0

1.5

1.0

0.5

0.0

10 kV Extraction Voltage

35 kV Platform Voltage

25 kV Post Acceleration Voltage

25 mA Beam Current

355 mm downstream from ground plane of post acceleration gap

2.5

mA/cm2

2.0

1.5

1.0

0.5

0.0

9 kV Extraction Voltage

35 kV Platform Voltage

26 kV Post Acceleration Voltage

21 mA Beam Current

355 mm downstream from ground plane of post acceleration gap

2.5

mA/cm2

2.0

1.5

1.0

0.5

0.0

8 kVExtraction Voltage

35 kV Platform Voltage

27 kV Post Acceleration Voltage

17 mA Beam Current

355 mm downstream from ground plane of post acceleration gap

2.5

mA/cm2

2.0

1.5

1.0

0.5

0.0

7 kV Extraction Voltage

35 kV Platform Voltage

28 kV Post Acceleration Voltage

13 mA Beam Current

355 mm downstream from ground plane of post acceleration gap

2.5

mA/cm2

2.0

1.5

1.0

0.5

0.0

6.5 kV Extraction Voltage

35 kV Platform Voltage

28.5 kV Post Acceleration Voltage

12 mA Beam Current

355 mm downstream from ground plane of post acceleration gap

2.5

mA/cm2

2.0

1.5

1.0

0.5

0.0

6 kVExtraction Voltage

35 kV Platform Voltage

29 kV Post Acceleration Voltage

10 mA Beam Current

355 mm downstream from ground plane of post acceleration gap

2.5

mA/cm2

2.0

1.5

1.0

0.5

0.0

5.5 kV Extraction Voltage

35 kV Platform Voltage

28.5 kV Post Acceleration Voltage

9 mA Beam Current

355 mm downstream from ground plane of post acceleration gap

2.5

mA/cm2

2.0

1.5

1.0

0.5

0.0

17 kV Extraction Voltage

35 kV Platform Voltage

18 kV Post Acceleration Voltage

47 mA Beam Current

355 mm downstream from ground plane of post acceleration gap

17 kV Extract Potential

-60 -600-30 30

0

50

100

-50

-100

x (mm)

x ‘(m

Ra

ds)

-60 -600-30 30

0

50

100

-50

-100 y (mm)

y ‘(mRads)

0.84 πmm-mRad norm rms 0.92 πmm-mRad norm rms

47 mA Beam Current

The Present Situation

Multi Beamlett Extraction

12345

H2CsCs

To study beam transport aperture plates with 5 separate 1 mm diameter holes have been constructed.

Position of Caesium and Hydrogen dispensing holes

Hole Index

VARY EXTRACTION VOLTAGE

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap

6 kV Extraction Voltage

18 kV Post Acceleration Voltage

7 kV Extraction Voltage

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap

18 kV Post Acceleration Voltage

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap

8 kV Extraction Voltage

18 kV Post Acceleration Voltage

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap

9 kV Extraction Voltage

18 kV Post Acceleration Voltage

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap

10 kV Extraction Voltage

18 kV Post Acceleration Voltage

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap

11 kV Extraction Voltage

18 kV Post Acceleration Voltage

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap

12 kV Extraction Voltage

18 kV Post Acceleration Voltage

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap

13 kV Extraction Voltage

18 kV Post Acceleration Voltage

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap

14 kV Extraction Voltage

18 kV Post Acceleration Voltage

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap

15 kV Extraction Voltage

18 kV Post Acceleration Voltage

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap

16 kV Extraction Voltage

18 kV Post Acceleration Voltage

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap

17 kV Extraction Voltage

18 kV Post Acceleration Voltage

0

5

10

15

20

25

30

35

40

6 8 10 12 14 16 18

Extraction Voltage (kV)

Be

am

Cu

rre

nt (

mA

) HOLE1

HOLE2

HOLE3

HOLE4

HOLE5

ALL

SUM

5

H2CsCs

4 3 2 1

Beam Current Variation with Extraction Voltage

Mapping the Field

5

H2CsCs

4 3 2 1 θ

r

r = 105 mm

r = 55 mmB

B

0

0.1

0.2

0.3

0.4

0.5

0.6

0 10 20 30 40 50 60 70 80 90

Angle (Degrees)

B (

T)

r = 55

r = 60

r = 65

r = 70

r = 75

r = 80

r = 85

r = 90

r = 95

r = 100

r = 105

Sector Magnet Field

0

0.1

0.2

0.3

0.4

0.5

0.6

55 60 65 70 75 80 85 90 95 100 105r (mm)

B (

T)

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

0

0.1

0.2

0.3

0.4

0.5

0.6

55 60 65 70 75 80 85 90 95 100 105r (mm)

B (

T)

0.00

0.99

1.98

2.97

4.05

5.05

6.04

7.03

8.02

9.01

10.00

0

0.1

0.2

0.3

0.4

0.5

0.6

55 60 65 70 75 80 85 90 95 100 105r (mm)

B (

T)

80.00

80.99

81.98

82.97

83.96

85.05

86.04

87.03

88.02

89.01

90.00

Angle (Degrees)

Magnetic Field

0

0.5

1

1.5

2

55 60 65 70 75 80 85 90 95 100 105r (mm)

n

0.00

0.99

1.98

2.97

3.96

5.05

6.04

7.03

8.02

9.01

10.00

0

0.5

1

1.5

2

55 60 65 70 75 80 85 90 95 100 105r (mm)

n

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

0

0.5

1

1.5

2

55 60 65 70 75 80 85 90 95 100 105r (mm)

n

80.00

80.99

81.98

82.97

83.96

85.05

86.04

87.03

88.02

89.01

90.00

Angle (Degrees)

Field Index

Overall Field Index

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

55 60 65 70 75 80 85 90 95 100 105

r (mm)

n

Sector Magnet Modifications

5

H2CsCs

4 3 2 1

Sector Magnet Modifications

5

H2CsCs

4 3 2 1

Sector Magnet Modifications

5

H2CsCs

4 3 2 1

Sector Magnet Modifications

5

H2CsCs

4 3 2 1

VARYPOST ACCELERATION

VOLTAGE

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap23 kV Post Acceleration Voltage

7 kV Extraction Voltage

HOLE 1 HOLE 2

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap25 kV Post Acceleration Voltage

7 kV Extraction Voltage

HOLE 1 HOLE 2

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap26 kV Post Acceleration Voltage

7 kV Extraction Voltage

HOLE 1 HOLE 2

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap27 kV Post Acceleration Voltage

7 kV Extraction Voltage

HOLE 1 HOLE 2

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap28 kV Post Acceleration Voltage

7 kV Extraction Voltage

HOLE 1 HOLE 2

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap29 kV Post Acceleration Voltage

7 kV Extraction Voltage

HOLE 1 HOLE 2

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap30 kV Post Acceleration Voltage

7 kV Extraction Voltage

HOLE 1 HOLE 2

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap31 kV Post Acceleration Voltage

7 kV Extraction Voltage

HOLE 1 HOLE 2

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap32 kV Post Acceleration Voltage

7 kV Extraction Voltage

HOLE 1 HOLE 2

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap33 kV Post Acceleration Voltage

7 kV Extraction Voltage

VARY SECTOR MAGNET CURRENT

HOLE1

5.5 A Sector Magnet Current

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap7 kV Extraction Voltage

28 kV Post Acceleration Voltage

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

6.0 A Sector Magnet Current355 mm downstream from ground plane of post acceleration gap

7 kV Extraction Voltage 28 kV Post Acceleration Voltage

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

6.5 A Sector Magnet Current355 mm downstream from ground plane of post acceleration gap

7 kV Extraction Voltage 28 kV Post Acceleration Voltage

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

355 mm downstream from ground plane of post acceleration gap

7.0 A Sector Magnet Current

7 kV Extraction Voltage 28 kV Post Acceleration Voltage

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

7.5 A Sector Magnet Current355 mm downstream from ground plane of post acceleration gap

7 kV Extraction Voltage 28 kV Post Acceleration Voltage

HOLE 1 HOLE 2 HOLE 3

HOLE 4 HOLE 5 ALL 5

8.0 A Sector Magnet Current355 mm downstream from ground plane of post acceleration gap

7 kV Extraction Voltage 28 kV Post Acceleration Voltage

VARY SCINTILATOR POSITION

HOLE 3 ALL 5

355 mm downstream from ground plane of post acceleration gap8 kV Extraction Voltage

27 kV Post Acceleration Voltage

HOLE 3 ALL 5

405 mm downstream from ground plane of post acceleration gap8 kV Extraction Voltage

27 kV Post Acceleration Voltage

HOLE 3 ALL 5

455 mm downstream from ground plane of post acceleration gap8 kV Extraction Voltage

27 kV Post Acceleration Voltage

HOLE 3 ALL 5

505 mm downstream from ground plane of post acceleration gap8 kV Extraction Voltage

27 kV Post Acceleration Voltage

HOLE 3 ALL 5

555 mm downstream from ground plane of post acceleration gap8 kV Extraction Voltage

27 kV Post Acceleration Voltage

HOLE 3 ALL 5

605 mm downstream from ground plane of post acceleration gap8 kV Extraction Voltage

27 kV Post Acceleration Voltage

HOLE 3 ALL 5

655 mm downstream from ground plane of post acceleration gap8 kV Extraction Voltage

27 kV Post Acceleration Voltage

HOLE 3 ALL 5

705 mm downstream from ground plane of post acceleration gap8 kV Extraction Voltage

27 kV Post Acceleration Voltage

HOLE 3 ALL 5

755 mm downstream from ground plane of post acceleration gap8 kV Extraction Voltage

27 kV Post Acceleration Voltage

0 μs

10 μs

20 μs

30 μs

40 μs

50 μs

60 μs

70 μs

80 μs

90 μs

100 μs

110 μs

120 μs

130 μs

140 μs

150 μs

160 μs

170 μs

180 μs

190 μs

200 μs

210 μs

220 μs

Cause of the cobra head

5

H2CsCs

4 3 2 1

Hydrogen causing the meniscus to blow out?

2.5

mA/cm2

2.0

1.5

1.0

0.5

0.0

10 kV Extraction Voltage

35 kV Platform Voltage

25 kV Post Acceleration Voltage

25 mA Beam Current

SLIT

2.5

mA/cm2

2.0

1.5

1.0

0.5

0.0

10 kVExtraction Voltage

35 kV Platform Voltage

25 kV Post Acceleration Voltage

5.8 mA Beam Current

HOLE

Additional

VARY EXTRACT ELECTRODE GAP

0

10

20

30

40

50

60

70

80

6 8 10 12 14 16 18

Extraction Voltage (kV)

Be

am

Cu

rre

nt (

mA

)

= 10 mm Post Ac. Gap / 1.1 mm Ext. Jaws= 10 mm Post Ac. Gap / 2.1 mm Ext. Jaws= 55 mm Post Ac. Gap / 2.1 mm Ext. Jaws

2.1 mm ext elec new PAE level with em scanners

1.1 mm ext elec new PAE level with em scanners

2.1 mm ext elec new PAE level with em scanners

1.1 mm ext elec new PAE level with em scanners

2.1 mm ext elec new PAE level with em scanners

1.1 mm ext elec new PAE level with em scanners

0.00E+00

5.00E+08

1.00E+09

1.50E+09

2.00E+09

2.50E+09

3.00E+09

0 2 4 6 8 10 12 14

Extraction Voltage (kV)

Inte

rgra

ted

Co

un

t

1.1mm

2.1mm

Integrated Light output for different extract jaw gaps

-2

-1

0

1

2

3

4

55 60 65 70 75 80 85 90 95 100 105

n