Ⅱ-9. Instrumentation

RIKEN Accel. Prog. Rep. 49 (2016)

Testsofofthe
theAdvanced
Advanced Implantation
Implantation Detector
Tests
DetectorArray
Array(AIDA)(AIDA)atatRIBF
RIBF
C.J. Griffin,*1 T. Davinson,*1 A. Estrade,*1 D. Braga,*2 I. Burrows,*3 P. Coleman-Smith,*3 T. Grahn,*4 A. Grant,*3L.J. Harkness-Brennan,*4 G. Kiss,*5 M. Kogimtzis,*3 I. Lazarus,*3 S. Letts,*3 Z. Liu,*1 G. Lorusso,*5 K. Matsui,*5,*6S, Nishimura,*5 R.D. Page,*4 V. Phong,*5 M. Prydderch,*2 V. Pucknell,*3 S. Rinta-Antila,*4 O. Roberts,*7 D. Seddon,*4J. Simpson,*3 J. Strachan,*3 S.L. Thomas*2 and P.J. Woods*1

Fig. 1: A photograph of the fully constructed AIDA assembly.

The Advanced Implantation Detector Array (AIDA)1)
represents the latest generation of silicon implantation
detectors for use in decay spectroscopy measurements ofexotic nuclei at fragmentation beam facilities.
Designed to improve upon current generation, AIDA
features high detector pixilation and fast overload recovery(~1 Ps), required at modern RI facilities with increasingly
high secondary beam intensity and access to isotopes withvery short half-lives.
Application specific integrated circuits (ASICs)2) were
specifically designed to meet the above requirements. One
ASIC can process 16 data channels, each with two
dedicated preamplifiers: one, with selectable gain to cover
the low and medium energy ranges of up to 1 GeV, and theother, a low-gain amplifier covering the full dynamic rangeof 20 GeV. Detector signals are carried via flexible Kapton
PCBs to the front end electronics (FEE) cards, which
support 64 channels of instrumentation. The FEE cards
contain: multiple analogue-to-digital converters (ADCs) for
use in signal processing; a field-programmable gate array(FPGA) for control, signal processing and datamanagement; and additional supporting electronics.
As each FEE card runs a separate data acquisition system
School of Physics and Astronomy, University of Edinburgh
STFC Rutherford Appleton Laboratory
㻖㻟
STFC Daresbury Laboratory㻖㻠
School of Physical Sciences, University of Liverpool
㻖㻡
RIKEN Nishina Centre㻖㻢
Department of Physics, University of Tokyo㻖㻣
School of Engineering and Mathematics, University of Brighton㻖㻝㻖㻞(DAQ), reading data from just 64 channels, dead-time isvastly reduced compared to current generation detectors
dealing with high pixelation. Fig. 1 shows the full AIDA
assembly.
To study the response of AIDA to implantation of heavyions, in-beam tests have been conducted at the Radioactive
Ion Beam Factory (RIBF) at RIKEN. The tests wereconducted parasitically to experiments part of theSEASTAR campaign, placing AIDA at the F11 focal plane.
In the most recent test configuration, AIDA comprised threeMSL BB18-1000 type DSSSDs, each with a thickness of 1mm and featuring 128 strips with a 0.625 mm pitch in boththe x and y directions.
These tests have demonstrated both the capability of AIDA
to detect position and energy of fast fragment beams andtheir decay products, as well as our ability to integrate
multiple DAQs – AIDA, and the BigRIPS in-beam
detectors for particle identification – into one data stream.
DAQ integration is achieved through the timestamping of
all data items in each data stream, which are thentime-ordered in the analysis software. This forms one
continuous stream of data containing information on theimplant positions, decay positions and energies, and particle
identification data from BigRIPS. A method has also beendeveloped by which the BRIKEN/AIDA DAQs can besynchronised, which will be tested with the full-scale
BRIKEN array once it has been assembled. In addition tothis, an online monitor has been developed to check thestatus of the DAQ synchronisation and to provide somebasic analysis in real-time.
Preliminary analysis of the data collected during these tests
is underway, from which we hope to see some early resultsin the near future. Further steps must still be taken to better
understand the efficiency of the analysis software incorrelating implants and decays, and in characterising thebackground to reduce the likelihood of random correlations.
With promising progress being made on all fronts, AIDA isplanned for use at RIBF throughout 2016-2017 with two
main focuses: E-decay half-life and decay spectroscopy
measurements with the EURICA J-ray detector, andmeasurements of E-delayed neutron emission probabilities
as part of the BRIKEN collaboration.
References1) C.J. Griffin, T. Davinson, A Estrade et al., POS(NIC XIII) 097 20142) D. Braga, P. J. Coleman-Smith, T. Davinson, I. H. Lazarus, R. Page,
and S. Thomas in ANIMMA 2nd International Conference, IEEE, 2011.

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