CAT of AGATA detectors & The AGATA triple cluster detector

CAT of AGATA detectors &The AGATA triple cluster detector

AGATA Week July 2008

University of CologneAndreas Wiens

B. Birkenbach, B. Bruyneel, J. Eberth, H. Hess, D. Lersch, G. Pascovici, P. Reiter - IKP Cologne

H.-G. Thomas - CTT

Overview

• Acceptance test results

• Status of the triple cluster detectors

• Crosstalk in triple cluster detector

• Summary

Core

at 1.3MeV: ≤ 2.35keVat 122keV: ≤ 1.35keV

Segments

at 1.3MeV: ≤ 2.30keV, mean ≤ 2.10keVat 60keV: ≤ 1.30keV, mean ≤ 1.20keV

Crosstalk ≤1‰

Experimental setup & specifications

Test results A002 & A003 after gluing core contactA002 - FWHM

A1 A6 B6 C1

D1

D6 E6 F10

0,5

1

1,5

2

2,5

Core B1 C6 E1 F6

FW

HM

[k

eV

]

59.6 keV 1332.5 keV Specification low energy 1,3 Specification high energy 2,3

A003 - FWHM

A1 A6 B6 C1 D1 D6 E6 F1

0

0,5

1

1,5

2

2,5

3

Core B1 C6 E1 F6

FW

HM

[k

eV

]

59.6 keV 1332.5 keV Specification low energy 1,3 Specification high energy 2,3

A003 detector accepted

A002 detector accepted

Test results C004

f6f1e6e1d6d1c6c1b6b1a6core a10

0,5

1

1,5

2

2,5

59.6 keV 1332.5 keV Specification low energy Specification high energy

detector accepted

Test results A004

a1core a6 b1 b6 c1 c6 d1 d6 e1 e6 f1 f6

0

0,5

1

1,5

2

2,5

3


Very good performance at low energies

low impurity concentration: crystal properties? trapping?

detector rejected

front seg. A1

back seg.F5

FWHM:2.66 keV

FWHM:2.83 keV

Test results B001

leakage current

damage at the contact or the implantation layer of A3 and C3 ?

detector rejected

1,2 MeV 1,3 MeV

Core 6 µs 2,66 2,77

3 µs 2,43 2,45

A3 6 µs 3,03 3,06

3 µs 2,44 2,53

C3 6 µs 2,48 2,48

3 µs 2,16 2,29

0

0,5

1

1,5

2

2,5

3

3,5

Core B1 C6 E1 F6

FW

HM

[ke

V]

59.6 keV 1332.5 MeV Specification low energy Specification high energy

C3

2.06 keV @ 59.5 keV

Test results B004First delivery: Dec 08B004 – missing segment F6 after first delivery

Second delivery: Jun 08Core @ 59.5/122 keV FWHM: 1.5/1.6 keV @ 1.3 MeV FWHM: 2.7 keV

High noise level at segment F4 (100 mV after Amp, without HV)

0

0,5

1

1,5

2

2,5

3

Core B1 C6 E1 F6

FW

HM

[ke

V]


60 keV122 keV

Core 6 µs 1.5 1.6

3 µs 1.5 1.55

F4 6 µs 1.9

3 µs 1.87

Core 5000 V

FWHM:1.74 keV@ 122 keV

Segments of sector F grounded:

Core @ 1.3 MeV FWHM: 2.72 keV

C001 in new TU Munich cryostat delivered to Liverpool for scanning

Mean FWHM @ 60 keV: May 06: 1147 +/- 63 eVJan 08: 1083 +/- 61 eV

f6f1e6e1d6d1c6c1b6b1a6core a1

0

0,5

1

1,5

2

2,5

3

59.6 keV May 06 59.6 keV Jan 08 1332.5 keV May 06

1332.5 keV Jan 08 Specification low energy Specification high energy

Mean FWHM @ 1.3 MeV:May 06: 2.13 +/- 0.1 keVJan 08: 2.1 +/- 0.1 keV

Summary acceptance tests

B001 06/07 Padova Rejected - damage of contacts of segments A3 & C3

A002 06/07 München Accepted

C004 09/07 Ankara Accepted

A004 09/07 Ankara Rejected - low impurity concentration and/or trapping

A003 10/07 Liverpool Accepted

B004 12/07 Ankara Tested, not in specification

A005 12/07 Uppsala Test ongoing (Saclay & Cologne)

C005 12/07 Uppsala Test at Saclay

B005 12/07 Uppsala Test at Saclay

A004 07/08 Ankara Test at Cologne

Asymmetric AGATA Triple Cryostat

Mechanical precision of the end caps

bending under vacuum within tolerances

Exact positioning of the detectors inside the triple endcap

Spacing 0.5 mm

LN2 consumption

Thermal properties

HV box fits

Tripel Cluster 1 Energies: Single vs Triple cryostat

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

Core A1A2A3A4A5A6 B1B2B3B4B5B6 C1C2C3C4C5C6 D1D2D3D4D5D6 E1E2E3E4E5E6 F1 F2 F3 F4 F5 F6

59,6 keV Single 59.6 keV Triple Specification low energy

0

0.5

1

1.5

2

2.5

3


1332,5 keV Single 1332,5 keV Triple Specification high energy

A0

01

– F

WH

M [

keV

]B

00

2 –

FW

HM

[ke

V]

0

0.5

1

1.5

2

2.5

3



0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6


59.6 keV Single 59.6 keV Triple Specification low energy

0

0.5

1

1.5

2

2.5

3



0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6


59,6 keV Single 59,6 keV Triple Specification low energy

C0

02

– F

WH

M [

keV

]

Resolution 60keV line Resolution 1.33MeV line

Excellent energy resolution in new triple cluster

Mean values segments @ 60 keV :

A001 : 1011 +/- 53 eV

B002 : 1039 +/- 70 eV

C002 : 965 +/- 63 eV

especially at low energies (electronic noise):

- glued detector less microphonics

- HEKO AGATA preamp

- electronic assembly (grounding, cabling)

For any 1406keV single event in the detector:

-3.0

-2.5

-2.0

-1.5

-1.0

-0.5

0.0

0 6 12 18 24 30 36

Hit segment number

Ba

selin

e S

hift

in A

1 (

keV

)

Cross talk : intro

A2..A6

B1 F1

Co

re to

se

g X

talk

= u

nd

erst

ood

!

Segment labeling:

Sectors: A...F

Rings: 1...6

X

A001 in Triple Cryostat 5000 V

-0,0025

-0,002

-0,0015

-0,001

-0,0005

0

0 200 400 600 800 1000 1200 1400

segment "i" + 36x segment "j"

Xta

lk a

mp

litu

de

s fr

om

se

g "

i" t

o s

eg

"j"

[%

]

Measured Cross talk

Core to Seg Xtalk (theory)

A2 B2

C2D2

E2 F2

Smallest capacities in ring 2

B002 in Triple Cryostat @ 5000 V

-0.25%

-0.20%

-0.15%

-0.10%

-0.05%

0.00%

0 200 400 600 800 1000 1200


Xta

lk a

mpl

itude

s fro

m s

eg "

i" to

seg

"j"

[%]

Measured Cross talk

Core to Seg Xtalk (theory)

Smallest capacities in ring 2

A2

B2 C2 D2 E2 F2

C002 in Triple Cryostat @ 5000 V

-0,25%

-0,20%

-0,15%

-0,10%

-0,05%

0,00%

0 200 400 600 800 1000 1200


Xta

lk a

mp

litu

de

s fr

om

se

g "

i" to

se

g "

j" [%

]

No cross talk between detectors in Triple Cryostat

-0.25%

-0.20%

-0.15%

-0.10%

-0.05%

0.00%

0.05%

0 200 400 600 800 1000 1200 1400 1600

-0.25%

-0.20%

-0.15%

-0.10%

-0.05%

0.00%

0.05%

0 200 400 600 800 1000 1200 1400 1600

-0.25%

-0.20%

-0.15%

-0.10%

-0.05%

0.00%

0.05%

0 200 400 600 800 1000 1200 1400 1600

A001 B002 C002

Co

re B

Co

re C

Co

re A

Co

re C

Co

re A

Co

re B

Sector A Sector F

Sector A Sector F Sector A Sector F

A00

1B

002

C00

2

Tripel Cluster 2 Energies: Single vs Triple cryostat

0

0,2

0,4

0,6

0,8

1

1,2

1,4

1,6

[A 0

03 -

FW

HM

]keV 59,6 keV Single 59,6 keV Triple Specification low energy

0

0,2

0,4

0,6

0,8

1

1,2

1,4

1,6

[B 0

03 -

FW

HM]k

eV 59,6 keV Single 59,6 keV Triple Specification low energy

Mean values segmens @ 60 keV :A001 : 1053 +/- 65 eVB002 : 995 +/- 73 eVC002 : 1149 +/- 105 eV

Resolution 60keV line

0

0,2

0,4

0,6

0,8

1

1,2

1,4

1,6

C0

04

- F

WH

M [

ke

V]

59,6 keV Single 59,6 keV Triple Specification low energy

preliminary

AGATA Triple Clusters: Summary and outlookAGATA Triple Cluster Detectors operational:-first triple: cryostat, mechanics, vacuum o.k. seg-preamps, core preamp & pulser o.k. energy resolution o.k. no cross talk between detectors second triple: commissioning phase

-

AGATA Triple Cluster Detectors operational:-first triple: cryostat, mechanics, vacuum o.k. seg-preamps, core preamp & pulser o.k. energy resolution o.k. no cross talk between detectors second triple: commissioning phase

-

Outlook: Demonstrator at Legnaro:

-- transport to Legnaro of ATC1 - in July 2008 -- assembly of third triple- constrained by available detectors

ATC2

ATC3

ATC1

Core pulser result: measurement of segment capacities in 1. triple

A001 5000 V

0

0,2

0,4

0,6

0,8

1

1,2

1,4

1,6

1,8

Ring 1 Ring 2 Ring 3 Ring 4 Ring 5 Ring 6

C [

pF

]

A

B

C

D

E

F

B002 5000 V

0

0,2

0,4

0,6

0,8

1

1,2

1,4

1,6

1,8


C [

pF

]

A

B

C

D

E

F

C002 5000 V

0

0,2

0,4

0,6

0,8

1

1,2

1,4

1,6

1,8


C [

pF

]

A

B

C

D

E

F

CAT of AGATA detectors & The AGATA triple cluster detector

Documents

Transcript of CAT of AGATA detectors & The AGATA triple cluster detector