Storage cells for internal experiments with Atomic Beam Source at the COSY storage ring

Mitg

lied

de

r H

elm

hol

tz-G

em

ein

sch

aft

Petersburg Nuclear Physics Institute Russia

Storage cells for internal experiments

with Atomic Beam Sourceat the COSY storage ring

by Kirill Grigoryev

Institut fuumlr Kernphysik Forschungszentrum Juumllich Germany

Petersburg Nuclear Physics Institute Gatchina Russia

14092011

2


140911 Kirill Grigoryev ( PNPI amp FZJ )

Storage cell

Proposed by W Haeberli2nd International Symposium On Polarization Phenomena Basel 1966

Cyclotronbeam

ABS beam

3



Storage cell

The first cell Deuteron VEPP-3 PINTEX IUCF-Cooler

HERMES DESY ANKE COSY

4



COSY ndash COoler SYnchrotron

bull internal experiments ndash with the circulating beam bull external experiments ndash with the extracted beam

p p d dwith momenta up to 37 GeVc

5



Spectrometer ANKE

ANKE at COSY

Targetsbull Solid stripbull Cluster jetbull Polarized gas cell ( polarized gas jet )

Magnetsbull D2 ndash spectrometer magnetbull D1 D3 ndash beam bending magnets

Detector systemsbull Positive amp Negativebull Forward amp Backwardbull Spectator Detectors

6



Polarized Internal gas Target (PIT)

Lamb-shift polarimeter (LSP) foronline polarization measurements

Storage cell to increase target densityAtomic Beam Source (ABS)

Target gas Hydrogen or Deuterium

Beam intensity (2 HFS) 8 ∙ 1016 ats

ABS beam size σ = 285 plusmn 042 mm

Hydrogen polarization PZ = 089 plusmn 001

PZ = - 096 plusmn 001

Target density at ANKE jet ~ 15 middot 1011 atcm2

cell ~ 21 middot 1013 atcm2

talk by M Mikirtychyants15 September 2011 talk by R Engels

13 September 2011

7



Development of the storage cells

for internal experimentswith Atomic Beam Source

at ANKE COSY

8



Beam profile measurements setup

XY-table Vacuum chamber

Frame with diaphragms or a special diaphragm support

COSYbeam

9



Measurement at injection

-25 -20 -15 -10 -5 0 5 10 15 20 25

0

1

2

3

4

5

6

7

8

9

10

Nu

mb

er

of

the

pa

rtic

les

in t

he

rin

g

x 1

010

X [mm]

962 plusmn 153)1010

144 plusmn 009

758 plusmn 012

target OFF fit

-125 -100 -75 -50 -25 00 25 50 75 100 125

0

1

2

3

4

5

6

7

8

9

10

Y [mm]

Num

ber

of th

e pa

rtic

les

in th

e rin

g x

10

10

target OFF fit

(959 plusmn 101)1010

196 plusmn 004

368 plusmn 006

X [mm]

2y

2y

0

y

0 2

)y(exp1Ndy)y()y(N

y

Scraper

F Hinterberger and D Prasuhn NIM A 279 (1989) 413K Potter Beam profiles Yellow Report CERN 85-19 pp301-317

10



Measurement on flattop (265GeV)

Transverse fixed storage cell dimensions are 15 x 20 mm2

Transverse openable storage cell dimensions are 15 x 12 mm2

11



Cooling procedures at COSY

At injection energy

Stacking injection

bull 28 stacks with 2s electron cooling bull acceleration to 600 MeV after 1 minute bull maximum cooling energy lt 100 MeV

On the flattop

Stochastic cooling

bull Minimum energy is cooling is 831MeV

Cooling off

Cooling on

12



First double pol experiment (2007)

Storage cell amp support

bull storage cell size ndash 15 x 20 x 390 mm3

bull 25 μm thin Al foil (9995 Al)

+ 5 μm Teflon coating

bull high target density

bull unpolarized gas feeding system

LSP below the target chamber

bull online measurement of the

ABS beam polarization

Silicon tracking telescope (STT)

bull measurement of spectator protons

nearby the storage cell center

(10 mm away from the cell wall)

13



Achievements in 2007

Stacking injection

120 injectionswith 10 s e-cooling

0 20 50Time min

Acceleration withoutgas in the storage cell

Switching on the gasto feed the storage cell

Flat top

30 min to haveabout 23 duty time

00E+00

10E+09

20E+09

30E+09

40E+09

50E+09

60E+09

70E+09

80E+09

8 12 16 20 24 28 32 36 40 44

Number of particles

Time min

~7 109 polarized deuteronsXY - distribution of the

particle trajectories

cellcell

Y - distribution of theparticle trajectories

14



H2 PIT ANKE status 2007

In 2007 commissioning of the Polarized Internal hydrogen gas

Target at COSY was completed successfully

The first 5 weeks production run with hydrogen PITwas performed in October 2009 (Exp 1721)

Another 7 weeks of data taking with hydrogen PITin May 2011 (Exp 205)

Polarized target density in the cell dt ~ 2 1013 atcm2

COSY-beam N ~ 7 109 d

Luminosity in the experiment L ~ 25 1029 s-1cm-2

Hydrogen polarization in the cell Qy = 075 plusmn 006

Deuteron COSY-beam polarization Pz ~ 051 plusmn 004

rarr

RESULTS

REngels - PSTP rsquo07 proceedingsAIP Conf Proc 980 161 (2008)

15



PIT ANKE in 2009

Fall 2009 beamtime at ANKE with polarized hydrogen source intensity- 8 middot 1016 atstarget density - 134 middot 1013 atcm2

expected density - 144 middot 1013 atcm2 (~7 more)

Storage cell configurationdimensions 15x20x370 (140+230) mm3

material 25μm Al + 5μm Teflon

16



Storage cell for ANKE

not openable storage cell for ANKE experiments

17



New storage cell

New experiments requires higher density

of the polarized H2 D2 target

Loosing intensity on the cell walls

Loosing time with stacking injection

Loosing density with fixed storage cell

ANKE needs an openable storage cell

18



Cell dimensions optimization (1)

19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21



Target chamber and 4 STT

22



Openable cell and 2 STT

23



Openable cell

24



Openable storage cell for ANKE

25




The opening mechanism was slightly

shifted from its original positionand the storage cell stop moving

at the end of the machine development

26



Conclusion

Fixed storage cell configurationdimensions 15x20x370 (140+230) mm3


Atomic hydrogen target density - 134 middot 1013 atcm2

Openable storage cell configurationdimensions 11x11x390 (190+200) mm3


Expected atomic hydrogen target - 47 middot 1013 atcm2

27



spare

28



First exp with storage cell (2006)

target thickness ~ 21 1013 cm-2

luminosity ~ 1029 cm-2s-1

Target ndash storage cellwith unpolarized ABS beam

cell region D2 region

target thickness ~ 1013 cm-2

Hydrogen in HFS 1 only

Target ndash storage cellwith (un)polarized ABS beam


AB

S-je

t de

nsit

y c

m-3

Target ndash ABS jetwith unpolarized Hydrogen

D2 regionABS-jet region

29



Magnetic field along the COSY

and PIT beams was measured

at different D2 currents

(from stand-by to max)

2



Storage cell

Proposed by W Haeberli2nd International Symposium On Polarization Phenomena Basel 1966

Cyclotronbeam

ABS beam

3



Storage cell



4






5



Spectrometer ANKE

ANKE at COSY




6










PZ = - 096 plusmn 001




13 September 2011

7





at ANKE COSY

8






COSYbeam

9




-25 -20 -15 -10 -5 0 5 10 15 20 25

0

1

2

3

4

5

6

7

8

9

10

Nu

mb

er

of

the

pa

rtic

les

in t

he

rin

g

x 1

010

X [mm]

962 plusmn 153)1010

144 plusmn 009

758 plusmn 012

target OFF fit

-125 -100 -75 -50 -25 00 25 50 75 100 125

0

1

2

3

4

5

6

7

8

9

10

Y [mm]

Num

ber

of th

e pa

rtic

les

in th

e rin

g x

10

10

target OFF fit

(959 plusmn 101)1010

196 plusmn 004

368 plusmn 006

X [mm]

2y

2y

0

y

0 2

)y(exp1Ndy)y()y(N

y

Scraper


10






11




At injection energy

Stacking injection


On the flattop

Stochastic cooling


Cooling off

Cooling on

12

















13




Stacking injection


0 20 50Time min



Flat top


00E+00

10E+09

20E+09

30E+09

40E+09

50E+09

60E+09

70E+09

80E+09

8 12 16 20 24 28 32 36 40 44

Number of particles

Time min



cellcell


14













rarr

RESULTS


15



PIT ANKE in 2009





16





17



New storage cell







18




19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







3



Storage cell



4






5



Spectrometer ANKE

ANKE at COSY




6










PZ = - 096 plusmn 001




13 September 2011

7





at ANKE COSY

8






COSYbeam

9




-25 -20 -15 -10 -5 0 5 10 15 20 25

0

1

2

3

4

5

6

7

8

9

10

Nu

mb

er

of

the

pa

rtic

les

in t

he

rin

g

x 1

010

X [mm]

962 plusmn 153)1010

144 plusmn 009

758 plusmn 012

target OFF fit

-125 -100 -75 -50 -25 00 25 50 75 100 125

0

1

2

3

4

5

6

7

8

9

10

Y [mm]

Num

ber

of th

e pa

rtic

les

in th

e rin

g x

10

10

target OFF fit

(959 plusmn 101)1010

196 plusmn 004

368 plusmn 006

X [mm]

2y

2y

0

y

0 2

)y(exp1Ndy)y()y(N

y

Scraper


10






11




At injection energy

Stacking injection


On the flattop

Stochastic cooling


Cooling off

Cooling on

12

















13




Stacking injection


0 20 50Time min



Flat top


00E+00

10E+09

20E+09

30E+09

40E+09

50E+09

60E+09

70E+09

80E+09

8 12 16 20 24 28 32 36 40 44

Number of particles

Time min



cellcell


14













rarr

RESULTS


15



PIT ANKE in 2009





16





17



New storage cell







18




19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







4






5



Spectrometer ANKE

ANKE at COSY




6










PZ = - 096 plusmn 001




13 September 2011

7





at ANKE COSY

8






COSYbeam

9




-25 -20 -15 -10 -5 0 5 10 15 20 25

0

1

2

3

4

5

6

7

8

9

10

Nu

mb

er

of

the

pa

rtic

les

in t

he

rin

g

x 1

010

X [mm]

962 plusmn 153)1010

144 plusmn 009

758 plusmn 012

target OFF fit

-125 -100 -75 -50 -25 00 25 50 75 100 125

0

1

2

3

4

5

6

7

8

9

10

Y [mm]

Num

ber

of th

e pa

rtic

les

in th

e rin

g x

10

10

target OFF fit

(959 plusmn 101)1010

196 plusmn 004

368 plusmn 006

X [mm]

2y

2y

0

y

0 2

)y(exp1Ndy)y()y(N

y

Scraper


10






11




At injection energy

Stacking injection


On the flattop

Stochastic cooling


Cooling off

Cooling on

12

















13




Stacking injection


0 20 50Time min



Flat top


00E+00

10E+09

20E+09

30E+09

40E+09

50E+09

60E+09

70E+09

80E+09

8 12 16 20 24 28 32 36 40 44

Number of particles

Time min



cellcell


14













rarr

RESULTS


15



PIT ANKE in 2009





16





17



New storage cell







18




19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







5



Spectrometer ANKE

ANKE at COSY




6










PZ = - 096 plusmn 001




13 September 2011

7





at ANKE COSY

8






COSYbeam

9




-25 -20 -15 -10 -5 0 5 10 15 20 25

0

1

2

3

4

5

6

7

8

9

10

Nu

mb

er

of

the

pa

rtic

les

in t

he

rin

g

x 1

010

X [mm]

962 plusmn 153)1010

144 plusmn 009

758 plusmn 012

target OFF fit

-125 -100 -75 -50 -25 00 25 50 75 100 125

0

1

2

3

4

5

6

7

8

9

10

Y [mm]

Num

ber

of th

e pa

rtic

les

in th

e rin

g x

10

10

target OFF fit

(959 plusmn 101)1010

196 plusmn 004

368 plusmn 006

X [mm]

2y

2y

0

y

0 2

)y(exp1Ndy)y()y(N

y

Scraper


10






11




At injection energy

Stacking injection


On the flattop

Stochastic cooling


Cooling off

Cooling on

12

















13




Stacking injection


0 20 50Time min



Flat top


00E+00

10E+09

20E+09

30E+09

40E+09

50E+09

60E+09

70E+09

80E+09

8 12 16 20 24 28 32 36 40 44

Number of particles

Time min



cellcell


14













rarr

RESULTS


15



PIT ANKE in 2009





16





17



New storage cell







18




19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







6










PZ = - 096 plusmn 001




13 September 2011

7





at ANKE COSY

8






COSYbeam

9




-25 -20 -15 -10 -5 0 5 10 15 20 25

0

1

2

3

4

5

6

7

8

9

10

Nu

mb

er

of

the

pa

rtic

les

in t

he

rin

g

x 1

010

X [mm]

962 plusmn 153)1010

144 plusmn 009

758 plusmn 012

target OFF fit

-125 -100 -75 -50 -25 00 25 50 75 100 125

0

1

2

3

4

5

6

7

8

9

10

Y [mm]

Num

ber

of th

e pa

rtic

les

in th

e rin

g x

10

10

target OFF fit

(959 plusmn 101)1010

196 plusmn 004

368 plusmn 006

X [mm]

2y

2y

0

y

0 2

)y(exp1Ndy)y()y(N

y

Scraper


10






11




At injection energy

Stacking injection


On the flattop

Stochastic cooling


Cooling off

Cooling on

12

















13




Stacking injection


0 20 50Time min



Flat top


00E+00

10E+09

20E+09

30E+09

40E+09

50E+09

60E+09

70E+09

80E+09

8 12 16 20 24 28 32 36 40 44

Number of particles

Time min



cellcell


14













rarr

RESULTS


15



PIT ANKE in 2009





16





17



New storage cell







18




19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







7





at ANKE COSY

8






COSYbeam

9




-25 -20 -15 -10 -5 0 5 10 15 20 25

0

1

2

3

4

5

6

7

8

9

10

Nu

mb

er

of

the

pa

rtic

les

in t

he

rin

g

x 1

010

X [mm]

962 plusmn 153)1010

144 plusmn 009

758 plusmn 012

target OFF fit

-125 -100 -75 -50 -25 00 25 50 75 100 125

0

1

2

3

4

5

6

7

8

9

10

Y [mm]

Num

ber

of th

e pa

rtic

les

in th

e rin

g x

10

10

target OFF fit

(959 plusmn 101)1010

196 plusmn 004

368 plusmn 006

X [mm]

2y

2y

0

y

0 2

)y(exp1Ndy)y()y(N

y

Scraper


10






11




At injection energy

Stacking injection


On the flattop

Stochastic cooling


Cooling off

Cooling on

12

















13




Stacking injection


0 20 50Time min



Flat top


00E+00

10E+09

20E+09

30E+09

40E+09

50E+09

60E+09

70E+09

80E+09

8 12 16 20 24 28 32 36 40 44

Number of particles

Time min



cellcell


14













rarr

RESULTS


15



PIT ANKE in 2009





16





17



New storage cell







18




19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







8






COSYbeam

9




-25 -20 -15 -10 -5 0 5 10 15 20 25

0

1

2

3

4

5

6

7

8

9

10

Nu

mb

er

of

the

pa

rtic

les

in t

he

rin

g

x 1

010

X [mm]

962 plusmn 153)1010

144 plusmn 009

758 plusmn 012

target OFF fit

-125 -100 -75 -50 -25 00 25 50 75 100 125

0

1

2

3

4

5

6

7

8

9

10

Y [mm]

Num

ber

of th

e pa

rtic

les

in th

e rin

g x

10

10

target OFF fit

(959 plusmn 101)1010

196 plusmn 004

368 plusmn 006

X [mm]

2y

2y

0

y

0 2

)y(exp1Ndy)y()y(N

y

Scraper


10






11




At injection energy

Stacking injection


On the flattop

Stochastic cooling


Cooling off

Cooling on

12

















13




Stacking injection


0 20 50Time min



Flat top


00E+00

10E+09

20E+09

30E+09

40E+09

50E+09

60E+09

70E+09

80E+09

8 12 16 20 24 28 32 36 40 44

Number of particles

Time min



cellcell


14













rarr

RESULTS


15



PIT ANKE in 2009





16





17



New storage cell







18




19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







9




-25 -20 -15 -10 -5 0 5 10 15 20 25

0

1

2

3

4

5

6

7

8

9

10

Nu

mb

er

of

the

pa

rtic

les

in t

he

rin

g

x 1

010

X [mm]

962 plusmn 153)1010

144 plusmn 009

758 plusmn 012

target OFF fit

-125 -100 -75 -50 -25 00 25 50 75 100 125

0

1

2

3

4

5

6

7

8

9

10

Y [mm]

Num

ber

of th

e pa

rtic

les

in th

e rin

g x

10

10

target OFF fit

(959 plusmn 101)1010

196 plusmn 004

368 plusmn 006

X [mm]

2y

2y

0

y

0 2

)y(exp1Ndy)y()y(N

y

Scraper


10






11




At injection energy

Stacking injection


On the flattop

Stochastic cooling


Cooling off

Cooling on

12

















13




Stacking injection


0 20 50Time min



Flat top


00E+00

10E+09

20E+09

30E+09

40E+09

50E+09

60E+09

70E+09

80E+09

8 12 16 20 24 28 32 36 40 44

Number of particles

Time min



cellcell


14













rarr

RESULTS


15



PIT ANKE in 2009





16





17



New storage cell







18




19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







10






11




At injection energy

Stacking injection


On the flattop

Stochastic cooling


Cooling off

Cooling on

12

















13




Stacking injection


0 20 50Time min



Flat top


00E+00

10E+09

20E+09

30E+09

40E+09

50E+09

60E+09

70E+09

80E+09

8 12 16 20 24 28 32 36 40 44

Number of particles

Time min



cellcell


14













rarr

RESULTS


15



PIT ANKE in 2009





16





17



New storage cell







18




19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







11




At injection energy

Stacking injection


On the flattop

Stochastic cooling


Cooling off

Cooling on

12

















13




Stacking injection


0 20 50Time min



Flat top


00E+00

10E+09

20E+09

30E+09

40E+09

50E+09

60E+09

70E+09

80E+09

8 12 16 20 24 28 32 36 40 44

Number of particles

Time min



cellcell


14













rarr

RESULTS


15



PIT ANKE in 2009





16





17



New storage cell







18




19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







12

















13




Stacking injection


0 20 50Time min



Flat top


00E+00

10E+09

20E+09

30E+09

40E+09

50E+09

60E+09

70E+09

80E+09

8 12 16 20 24 28 32 36 40 44

Number of particles

Time min



cellcell


14













rarr

RESULTS


15



PIT ANKE in 2009





16





17



New storage cell







18




19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







13




Stacking injection


0 20 50Time min



Flat top


00E+00

10E+09

20E+09

30E+09

40E+09

50E+09

60E+09

70E+09

80E+09

8 12 16 20 24 28 32 36 40 44

Number of particles

Time min



cellcell


14













rarr

RESULTS


15



PIT ANKE in 2009





16





17



New storage cell







18




19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







14













rarr

RESULTS


15



PIT ANKE in 2009





16





17



New storage cell







18




19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







15



PIT ANKE in 2009





16





17



New storage cell







18




19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







16





17



New storage cell







18




19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







17



New storage cell







18




19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







18




19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







19




20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







20




100 ~ 134 middot 1013 atcm2

328 ~ 440 middot 1013 atcm2

21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







21




22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







22




23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







23



Openable cell

24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







24




25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







25







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







26



Conclusion







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







27



spare

28












AB

S-je

t de

nsit

y c

m-3



29







28












AB

S-je

t de

nsit

y c

m-3



29







29







Documents

Storage cells for internal experiments with Atomic Beam Source at the COSY storage ring