AGATA Detector Meeting

March 16th, 2006, Cologne

Detector Acceptance Tests:

delivered: three symmetric detectors

S001 properties excellent S002 properties excellent S003 properties excellent

three asymmetric detectors

A001 does not meet specification B001 does not meet specification C001 test ongoing, one segment missing

Cologne test cryostat

Modified HeKoPreamplifiers: BNC output connectors

Acceptance test includes: energy resolution at 60 keV, 1.3 MeV with analogue electronics, energy resolution and crosstalk with digital electronics (XIA DGF4C, Rev. E)

0,00

0,50

1,00

1,50

2,00

2,50

Reihe1

Reihe2

Segment specifications

Guaranteed FWHM at 1.3MeV : <2.30keV, mean < 2.1keV at 60keV : <1.35keV, mean < 1.15keV Expected FWHM at 1.3MeV : mean < 2.05keV at 60keV : <1.00keV

FWHM at 1.3MeV

FWHM at 60keV

Mean(1.3MeV)=1.99keV

Mean(60keV)=1.14keV

Core specification

Guaranteed at 1.3MeV: 2.35keV at 122keV: 1.35keV

Core FWHM: at 1.3MeV : 2.10keVat 122keV : 1.20keV

IKP Cologne 001

0,00

0,50

1,00

1,50

2,00

2,50

Reihe1

Reihe2

Segment specifications

Guaranteed FWHM at 1.3MeV : <2.30keV, mean < 2.1keV at 60keV : <1.35keV, mean < 1.15keV Expected FWHM at 1.3MeV : mean < 2.05keV at 60keV : <1.00keV

FWHM at 1.3MeV

FWHM at 60keV

Mean(1.3MeV)=1.98keV

Mean(60keV)=1.07keV

Core specification

Guaranteed at 1.3MeV: 2.35keV at 122keV: 1.35keV

Core FWHM: at 1.3MeV : 2.08keVat 122keV : 1.19keV

GSI 002

0,00

0,50

1,00

1,50

2,00

2,50

Reihe1

Reihe2

Segment specifications

Guaranteed FWHM at 1.3MeV : <2.30keV, mean < 2.1keV at 60keV : <1.35keV, mean < 1.15keV Expected FWHM at 1.3MeV : mean < 2.05keV at 60keV : <1.00keV

FWHM at 1.3MeV

FWHM at 60keV

Mean(1.3MeV)=2.01keV

Mean(60keV)=1.03keV

Core specification

Guaranteed at 1.3MeV: 2.35keV at 122keV: 1.35keV

Core FWHM: at 1.3MeV : 2.13keVat 122keV : 1.10keV

INFN Padova 003

Detector 1

Detector 2

Detector 3

Crosstalk < 10for all three detectors

-3

Resolution of B001-73888

0

0,5

1

1,5

2

2,5

3

3,5

4

FW

HM

[k

eV

]

Reihe1

Reihe2FWHM at 1.3 MeV

FWHM at 60 keV

Resolution of A001-73892

0

0,5

1

1,5

2

2,5

3

FW

HM

[k

eV

]

Reihe2

Reihe1FWHM at 60keV

FWHM at 1.3 MeV

Resolution of A001-73892

Sample spectrum of segment A1 (2.7keV)

Sample spectrum of segment A3 (2.33keV)

Sample spectrum of segment A5 (3.66keV)

Detector B001

Examples of spectra at Vdet = 5000V:

Core: FWHM = 2.17 kev at 1.3 MeV Segment C2: FWHM = 1.92 keV at 1.3 MeV

Segment D5: FWHM = 2.60 keV at 1.3 MeV Segment D6: FWHM = 2.63 keV at 1.3 MeV

Detector A001

The three symmetric detectors are being mounted in test cryostats for scanning:

cryostat 1: delivered to Liverpool cryostat 2: almost ready for delivery to Orsay cryostat 3: detector to be mounted

Two of the asymmetric detectors were returned to Canberra for repair.

Acknowledgement:

symmetric detectors tested by D. Weißhaar analogue tests of asymmetric detectors by H. Hess, A. Wiens crosstalk measurement of test cryostats by N. Warr