Detector Module Three 36-fold segmented detectors 111 preamplifiers Cryostat Jürgen Eberth University of Cologne Detector Team: Dirk Weißhaar Preampl. Team: Alberto Pullia Status Report 2/2005

The 36-fold segmented, encapsulated detector symmetric detectors: No. Delivered accepted 1 May 04 July 04 2 May 04 July 04 3 Dec 04 Feb 05

Detector Acceptance Test at IKP Cologne Dedicated cryostat: Internal layout as in triple cryostat (optimised for minimum crosstalk), cold FET‘s, low power (23 mW/FET) Heko preamp, single ended output Measured: Energy resol. at 60, 1333 keV Cross talk from coincidences, Efficiency

Segment specifications Guaranteed FWHMat 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 : 2.10keV at 122keV : 1.20keV IKP Cologne 001

Segment specifications Guaranteed FWHMat 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 : 2.08keV at 122keV : 1.19keV GSI 002

Segment specifications Guaranteed FWHMat 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 : 2.13keV at 122keV : 1.10keV INFN Padova 003

„Crosstalk“ between the segments 0.6 keV 1.5keV Crosstalk < 10 -3

Detector 1 Detector 2 Detector 3 Crosstalk < 10 for all three detectors -3

AGATA test cryostat for single detectors

AGATA test cryostat for individual detectors 1 cryostat available (used to characterise detector 001 at Liverpool) 1 ordered (Italy) 1 to be ordered (France) Task: Characterisation of individual detectors in different labs Specifications: Detector temp. 90 K Dewar volume 3 ltr LN holding time 20h pow. 26h unp. AGATA preamps diff. output 2

CSPs for the first AGATA_Detector Segments Test SpecificationIN2P3_Ganil FR4 substrate (FET_ BF862 ) INFN-Milan Alumina substr. (FET_BF 862) IKP-Cologne (Miniball He_Ko) (FET_BF862) Sensitivity ( mV / MeV ) ~ 100 mV/MeV ( differential ) ~ 100 mV/MeV ( differential ) ~ 175 mV/MeV (single ended ) Resolution (Cd= 0pF; cold FET) ~ 600 eV~ 600 eV (*)~ 600 eV Slope ( + eV/ pF [Cd] ) < 10 eV / pF ( cold FET ) < 10 eV / pF ( warm FET *) ! < 10 eV / pF ( cold FET ) Rise time (Cd= 0pF; cold FET) ~ 20 ns (*) ( warm FET) ! ~ 9 ns (*) ( warm FET) ! ~ 15 ns ( cold FET) Slope ( + ns/ pF [Cd]) ~ 0.6 ns ( ~30 ns / 15 pF ) ~ 0.25 ns ( ~ 13.5 ns / 23 pF ) ~ 0.3 ns ( ~ 26 ns / 33 pF ) U (out)/(50 Ohm) / Power (mW) ~ 1.5V / ~ 290 mW ( +/- 6V & +/-12V ) ~ 1.5 V / ~290 mW ( +/- 6V & +/-12V ) ~ 4.5V / ~ 450 mW ( + /- 12V ) Open Loop Gain (calc.) ~ 10,000> 100,000 ~ 20,000

SpecificationIKP-Cologne (a) (FET_BF862) IKP-Cologne (b) (FET_IF1320) IKP-Cologne (Miniball) (FET_IF1320) Sensitivity ( mV / MeV ) ~ 100 mV/MeV ( differential ) ~ 100 mV/MeV ( differential ) ~ 175 mV/MeV ( single ended ) Resolution (Cd= 0pF; cold FET) ~ 600 eV Slope ( + eV/ pF [Cd] ) < 10 eV / pF ( cold FET ) 10 eV / pF ( cold FET ) < 10 eV / pF ( cold FET ) Rise time (Cd= 0pF; cold FET) ~ 10 ns ( cold FET) ~ 15 ns ( cold FET) ~ 15 ns ( cold FET) Slope ( + ns/ pF [Cd]) ~ 0.25 ns ( ~ 18 ns / 33 pF ) ~ 0.3 ns ( ~ 26 ns / 33 pF ) ~ 0.3 ns ( ~ 26 ns / 33 pF ) U (out)/(100 Ohm) / Power (mW) ~ 2.0V /~ 290 mW ~ 4.5V /~ 450 mW ( + /- 12V ) Charge Sensitive Stage Saturation equiv. 20 MeV equiv. 100 MeV Open Loop Gain (calc.) > 100,000~ 20,000 CSPs for the first AGATA_Detector Core Test

AGATA Core Pulser

AGATA CORE & PULSER Am 241 ~ 1.25 keV Pulser ~ 1.25 keV

AGATA CORE & PULSER Co 60 ~ 2.15/2.26keV Pulser ~ 1.28 keV

AGATA symmetric triple cryostat 111 preamps with cold FET‘s, differential output Separate cooling for detectors and FET‘s Readout through 3M-RDM26 video cables Specifications: Detector temp. 90 K Dewar volume 4.5 ltr Holding time 18h pow. 30h unp. LN level readout Weight 45 kg 2

AGATA symmetric triple Cryostat

Done in 2004/05: Detectors: Three detectors tested in Cologne, Energy resolution very good, well within specs Crosstalk < 0.1 % Preamplifiers: Development of segment preamps (PACAGA5A- GANIL and PB-B1-Milano) and of core preamp COREKöln almost finished Cryostats: Cologne test cryostat (HeKo preamps) AGATA test cryostat (GANIL preamps) with detector 001 moved to Liverpool for scanning Symmetric Triple Cryostat

Next Steps: March/April 2005: Test of the different preamps for core and segments with detectors in the triple cryostat April/May 2005: Final assembly of symmetric triple detector module June/July 2005: Performance measurements of the symmetric detector module with radioactive sources and in-beam using MINIBALL XIA electronics Fall 2005: Transfer of the three detectors to individual test cryostats for detector characterisation and performance tests of new electronics November 2005: Delivery of the first asymmetric capsule June 2006: First asymmetric detector module