advanced implantation detector array (aida): project summary & status tom davinson school of...
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Advanced Implantation Detector Array (AIDA):Project Summary & Status
Tom DavinsonSchool of Physics & AstronomyThe University of Edinburgh
presented byTom Davinson
on behalf of the AIDA collaboration(Edinburgh – Liverpool – STFC DL & RAL)
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AIDA Project
Project web site
http://www.ph.ed.ac.uk/~td/AIDA/welcome.html
The University of Edinburgh (lead RO)Phil Woods et al.
The University of LiverpoolRob Page et al.
STFC DL & RALJohn Simpson et al.
Project Manager: Tom Davinson
Project commenced: September 2006
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DESPEC: Implantation DSSD Concept
• SuperFRS, Low Energy Branch (LEB)• Exotic nuclei – energies ~ 50 – 200MeV/u• Implanted into multi-plane, highly segmented DSSD array• Implant – decay correlations• Multi-GeV DSSD implantation events• Observe subsequent p, 2p, , , , p, n … decays• Measure half lives, branching ratios, decay energies …• Tag interesting events for gamma and neutron detector arrays
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Implantation DSSD Configurations
Two configurations proposed:
a) 8cm x 24cm “cocktail” mode many isotopes measured simultaneously
b) 8cm x 8cm high efficiency mode concentrate on particular isotope(s)
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AIDA: DSSD Array Design
• 8cm x 8cm DSSDscommon wafer design for 8cm x 24cm and 8cm x 8cm configurations
• 8cm x 24cm3 adjacent wafers – horizontal strips series bonded
• 128 p+n junction strips, 128 n+n ohmic strips per wafer• strip pitch 625m• wafer thickness 1mm• E, Veto and up to 6 intermediate planes
4096 channels (8cm x 24cm)• overall package sizes (silicon, PCB, connectors, enclosure … )
~ 10cm x 26cm x 4cm or ~ 10cm x 10cm x 4cm
courtesy B.R
ubio
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ASIC Design Requirements
Selectable gain 20 1000 20000 MeV FSRLow noise 12 600 50000 keV FWHM
energy measurement of implantation and decay events
Selectable threshold < 0.25 – 10% FSRobserve and measure low energy detection efficiency
Integral non-linearity < 0.1% and differential non-linearity < 2% for > 95% FSRspectrum analysis, calibration, threshold determination
Autonomous overload detection & recovery ~ sobserve and measure fast implantation – decay correlations
Nominal signal processing time < 10sobserve and measure fast decay – decay correlations
Receive (transmit) timestamp datacorrelate events with data from other detector systems
Timing trigger for coincidences with other detector systemsDAQ rate management, neutron ToF
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Schematic of Prototype ASIC Functionality
Note – prototype ASIC will also evaluate use of digital signal processing
Potential advantages• decay – decay correlations to ~ 200ns• pulse shape analysis• ballistic deficit correction
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• High (20MeV FSR), intermediate (1GeV FSR) and low gain (20GeV FSR) channels in parallel
• Blocks are sequenced to follow signal’s flow (“left to right”)
• Shaper and peak hold at back end to minimize noise
• 400m x 6mm
400m
~6mm
Preamplifiers + feedback
700pF feedback capacitor
High speed buffer
Fast comparators
Slow comparator
Shapers
Peak Holds + MUX
Prototype AIDA ASIC: Channel Layout
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• Analogue inputs left edge
• Control/outputs right edge
• Power/bias top and bottom
• 16 channels per ASIC
• Prototypes delivered May 2009MPW run100 dies delivered
• Functional tests at STFC RAL OK
Prototype AIDA ASIC: Top level design
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Prototype AIDA ASIC: Analogue input and bias reference
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Prototype AIDA ASIC: Analogue outputs
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Prototype AIDA ASIC
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Input signals (voltage step capacitive-coupled)
Preamp buffered output(Low-Medium Energy Channel)
Trigger output
“Data Ready” signal
Variable medium-energy (ME) event followed after 5us by a second fixed ME event: the energy of the first event (11.75pC, 23.5pC, 35.25pC) does not affect the response to the second (11.75pC).
1: Medium Energy (ME) + ME
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Input signals (voltage step capacitive-coupled)
Analog output (peak-hold multiplexed output)
Trigger output
“Data Ready” signal
When the data ready signal is active, the correct value is present at the analogue output (after the hit has been detected and the correct address been fed into the output multiplexer).NB: the test environment is very noisy and that affects the measurements.
1: Medium Energy (ME) + ME
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Three high-energy (HE) events (610pC, 430pC, 250pC) followed by a ME event (28.8pC): the initial HE event does not affect the response to the second.[The roll-of of the L-ME channel preamplifier is due to the HE channel amplifier becoming active: the two are effectively in parallel. Note the Range signal changing status after the HE event]
Input signals (voltage step capacitive-coupled)
Preamp buffered output(Low-Medium Energy Channel)
“Range” signalHigh = high-energy channel active
“Data Ready” signal
2: High Energy (HE) + ME
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Analog output (peak-hold multiplexed output)
“Data Ready” signal
Although the low-medium energy channel preamp saturates, the correct value is stored and multiplexed to the Analog Output when the “Data Ready” signal is active.
Preamp buffered output(Low-Medium Energy Channel)
2: High Energy (HE) + ME
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Fixed high-energy (HE) event (610pC) followed by three ME events (15pC, 30pC, 45pC): the ASIC recovers autonomously from the overload of the L-ME channel and the second event is read correctly.
Input signals (voltage step capacitive-coupled)
Preamp buffered output(Low-Medium Energy Channel)
“Range” signalHigh = high-energy channel active
“Data Ready” signal
3: High Energy (HE) + ME
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Fixed high-energy (HE) event (610pC) followed by three ME events (15pC, 30pC, 45pC): the ASIC recovers autonomously from the overload of the L-ME channel and the second event is read correctly.
Input signals (voltage step capacitive-coupled)
Preamp buffered output(Low-Medium Energy Channel)
“Range” signalHigh = high-energy channel active
“Data Ready” signal
3: High Energy (HE) + ME
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First value (constant) given by the High-Energy channel, second by the Medium-Energy channel.
Input signals (voltage step capacitive-coupled)
“Range” signalHigh = high-energy channel active
“Data Ready” signal
Analog output (peak-hold multiplexed output)
3: High Energy (HE) + ME
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• 4x AIDA ASICs
64 channels• Design complete• Delivery November 9
20 units
Prototype AIDA Mezzanine
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Prototype AIDA FEEM
ult
iple
x
read
out
Digital readout
FPGA, Memory, Gbit
Clock distribution Power SuppliesMezzanine
• Design complete• Production complete
8 units (4x AIDA, 2x DL DDG, 2x LYCCA)• Delivered week commencing 21.9.09
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Prototype FEE card• Initial tests underway (STFC DL DDG)
- FPGA Virtex 5 configuration- PowerPC with internal memory & terminal- DDR2 memory tests- Gbit ethernet- ASIC comms and discriminator timing- Analog buffers & ADCs- etc
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FEE Assembly Sequence
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Prototype AIDA Enclosure
• Prototype mechanical design• Based on 8cm x 8cm DSSSD
evaluate prior to design for 24cm x 8cm DSSSD• Compatible with RISING, TAS, 4 neutron detector
• 12x 8cm x 8cm DSSSDs 24x AIDA FEE cards
• 3072 channels
• Design complete
• Mechanical assembly in progress
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Prototype AIDA Enclosure
- Design drawings (PDF) available http://www.eng.dl.ac.uk/secure/np-work/AIDA/
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AIDA Project Timeline
• November/December 2009Systems integration (ASIC+Mezzanine+FEE)Bench tests
• February 2010In-beam tests
• March 2010Design revisions
• April 2010 ASIC engineering runFEE production run
• June 2010Production delivery complete
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Acknowledgements
My thanks to:
STFC DL Ian Lazarus, Patrick Coleman-Smith,Jonathan Strachan & Paul Morrall
STFC RAL Steve Thomas & Davide BragaEdinburgh Zhong LiuLiverpool Dave Seddon, Sami Rinta-Antila & Rob Page
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Prototype AIDA FEE:
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Design Study Conclusions
• 4’’ or 6” Si wafer technology?- integrated polysilicon bias resistors (15M)- separate coupling capacitors (require 22nF/200V+)
• Radiation damage mitigation measures essential- detector cooling required
• Noise specification (12keV FWHM) … “not unreasonable”
• Discriminator - low threshold (<50keV) – slow, compromised for ID > 100nA- separate timing discriminator – higher threshold
• x1000 overload recovery ~ s achievable- depends on input pulse shape- optimisation requires more information