Performance of the first three AGATA triple cluster detectors · re A1 A 3A5 B2 B 4 B6 C1 C 5 D2 D4...

Performance of the first three AGATA triple cluster detectors

AGATA Week Mar 2009IKP Cologne

University of CologneAndreas Wiens

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

H.-G. Thomas - CTT

Experimental setup

digital

analog

Frequency analyzer

ATC2 withAGATA HV

Tripel Cluster 1 Energies: Single vs Triple cryostat

Resolution 60keV line Resolution 1.33MeV line

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

Core A1A2A3A4A5A6 B1B2B3B4B5B6 C1C2C3C4C5C6 D1D2D3D4D5D6 E1E2E3E4E5E6 F1F2F3F4F5F6

59,6 keV Single 59.6 keV Triple Specification low energy

0

0.5

1

1.5

2

2.5

3

Core A1A2A3A4A5A6 B1B2B3B4B5B6 C1C2C3C4C5C6 D1D2D3D4D5D6 E1E2E3E4E5E6 F1F2F3F4 F5F6

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

0

0,5

1

1,5

2

2,5

3

Core A1A2A3A4A5A6 B1B2B3B4B5B6 C1C2C3C4C5C6 D1D2D3D4D5D6 E1E2E3E4E5E6 F1F2F3F4F5F6


0

0,2

0,4

0,6

0,8

1

1,2

1,4

1,6

1,8

Core A1 A2 A3 A4 A5 A6 B1 B2 B3 B4 B5B6 C1 C2 C3 C4 C5 C6 D1 D2 D3 D4 D5 D6 E1 E2 E3 E4 E5 E6 F1 F2 F3 F4 F5 F6

59,6 keV Legnaro 59.6 keV Triple Specification low energy

0

0,2

0,4

0,6

0,8

1

1,2

1,4

1,6


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

0

0,5

1

1,5

2

2,5

3


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

Excellent energy resolution in new triple cluster

Mean values segments @ 60 keV :

A001 : 1011 +/- 53 eV

B002 : 1039 +/- 70 eV

C002 : 965 +/- 63 eVespecially at low energies (electronic noise):- glued detector → less microphonics- HEKO → AGATA preamp - electronic assembly (grounding, cabling)

Cross talk in AGATA Triple Cluster

-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

Cor

e B

Cor

e C

Cor

e A

Cor

e C

Cor

e A

Cor

e 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

Core A2 A5 B1 B4 C3 C6 D2 D5 E1 E4 F3 F6

]A00

3 - F

WH

M [k

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

Resolution 60keV line

0

0,5

1

1,5

2

2,5

3

Core A1 A3 A5 B2 B4 B6 C1 C3 C5 D2 D4 D6 E1 E3 E5 F2 F4 F6

FWH

M [k

eV]


0

0,2

0,4

0,6

0,8

1

1,2

1,4

1,6

Core A2 A5 B1 B4 C3 C6 D2 D5 E1 E4 F3 F6

]B00

3 - F

WHM

[keV

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

0

0,5

1

1,5

2

2,5

3


FWH

M [k

eV]


0

0,5

1

1,5

2

2,5


FWHM

[keV

]


0

0,2

0,4

0,6

0,8

1

1,2

1,4

1,6


C00

5 -

FWH

M [

keV

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

Mean values segments @ 60 keV :A003 : 1140 +/- 80 eVB003 : 1060 +/- 70 eVC005 : 970 +/- 60 eV

Mean values segments @ 1333 keV :A003: 2.10 +/- 0.13 keVB003: 2.08 +/- 0.11 keVC005: 2.04 +/- 0.12 keV

1,33MeV

36.5, 73, 110 MHz

10, 40 MHz

Temporary HF oscillation deteriorates performance

FWHM decreased by oscillation

Problems for PSA

25 mV amplitude

digital aquisition

20ns rise time7% over shoot

Pulser with rise time of 1ns

Capacities used for adjusting rise time to specified value

Rise time of cold FET is 20% faster than for warm FETs

Rise time adjustment of preamps

10MHz2MHz 50MHz

38ns rise timeNo over shoot

before modification

after modification

ATC1 @Legnaro

Modification on Milano preamp by Alberto Pullia

Oscillation on first of 3 channels @ 10-18 MHz

The jumpers to the FET drain pins, were replaced with 22 Ohm resistors

The variable capacitor was turned to maximum value

->Very good performance for both types ofsegment preamps

before modification

after modification

Modifications in cold part

before modification

4, 6.8, 9.5 MHz

after modification

Clean signal

Use of return current wires

One common ground!

ca. 3 mV noise band

Modification in warm part

40MHz 73MHz

Short connection of ground pins on preamp PCB & connecting to common warm PCB due to weak micro match connector

Lost contact for a segment pin in micro match connector– signal bypassed

Quality of micro match connector?

ca. 30 mV noise band

Clean signal after modifications in ATC2

before modification

15, 33, 40, 73 MHz

before modification

4, 9.5, 110 MHz

after modifications No HF oscillation since modification!

HF Performance of ATC3

after modification before modification

4, 7, 15 + 40 MHz

Modifications also partly applied in ATC1

No HF oscillation since modification!

Performance of ATC3

B005 upright B005 upside down

0

0,2

0,4

0,6

0,8

1

1,2

1,4

1,6

Core A1A2A3A4A5A6 B1B2B3B4B5B6 C1C2C3C4C5C6 D1D2D3D4D5D6 E1E2E3E4E5E6 F1F2F3 F4F5F6

FWH

M [k

eV] @

60

keV

- A

002

59.6 keV Triple Specification low energy

0

0,2

0,4

0,6

0,8

1

1,2

1,4

1,6

1,8

Core A1A2A3A4A5A6 B1B2B3B4B5B6 C1C2C3C4C5C6 D1D2D3D4D5D6 E1E2E3E4E5E6 F1F2F3 F4F5F6

FWHM

[keV

] @ 6

0 ke

V -

C00

3

59.6 keV Triple Specification low energy

FWHM @ 60 keV

A1 1.11

B1 1.08

C1 1.12

D1 1.18

E1 1.14

F1 1.15

FWHM at 60keV: Core: 1.88keV (6µs)

1.89keV (3µs) Segment F1: > 4keV

-> out of specification

FWHM at 60 keV: Core: 1.30 keVF1: 1.15 keV

-> within specification

A002 C003

Summary & Outlook

3 triple clusters operational

ATC1 operated in Legnaroneeds modification in cold part

ATC2 optimized & operational with AGATA HV boxes

ATC3 operational & consistent with ATC2 B005 & B006 with leakage current

Relevant oscillation located and removed

Modification on Milano preamp by �Alberto PulliaSummary & Outlook

Performance of the first three AGATA triple cluster detectors · re A1 A 3A5 B2 B 4 B6 C1 C 5 D2 D4...

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Transcript of Performance of the first three AGATA triple cluster detectors · re A1 A 3A5 B2 B 4 B6 C1 C 5 D2 D4...