Transcript Electronics for PARIS Working Group

Piotr Bednarczyk
Instytut Fizyki Jądrowej
im. Henryka Niewodniczańskiego
Polskiej Akademii Nauk
Electronics for PARIS
Searching for optimum solution
Outline
PARIS
Anc. detector –RFD
if time
(and audience)
permits…
P.Bednarczyk
PARIS design goals:
Design and build high efficiency detector consisting of 2 shells for medium
resolution spectroscopy and calorimetry of g-rays in large energy range.
Inner sphere, highly granular, will be made of new crystals LaBr3(Ce),
rather short (up to 2-4 inches). The readout might be performed with
PMTs or APDs.
Inner-sphere will be used as a multiplicity filter of high resolution, sumenergy detector (calorimeter) and detector for the gamma-transition up 10
MeV with medium energy resolution (better than 3%). It will serve also for
fast timing application (Dt<1ns).
Outer sphere, with lower granularity but with high volume detectors,
rather long( at least 5 inches), could be made from conventional crystals
(BaF2 or CsI), or using existing detectors (Chateau de Crystal or HECTOR).
The outer-sphere will measure high-energy photons or serve as an active
shield for the inner one.
P.Bednarczyk
Compatibility with other devices is key
+ NEDA,HYDE, RFD etc……
P.Bednarczyk
Basic requirements for the PARIS electronics
Serve 200-1000 detector channels (energy and time per
channel)
Deal with fast signals of LaBr3: risetime <1ns, decaytime ~20
ns
Stand rates up to 100 kHz per channel
Perform pulse shape analysis for neutron and gamma
discrimination (?) and for disentanglement of overlapping
signals from phoswitch detectors
Keep time resolution better than 1 ns, for TOF purposes
Measure energies up to ~50 MeV with 3% resolution.
Trigger less readout with timestamping
Provide a gamma time relative to an external signal and a
gamma energy (or series of energies if from phoswich) with a
corresponding timestamp
P.Bednarczyk
GAMMA-TELESCOPE
•E1
I
•LaBr3
•(2”x2”)
•E2
•CsI or BaF2
•(2”x6”)
•PMT
•PMT
•t1
•t2
•E1
•APD
II
•LaBr3
•(2”x2”)
•CsI or BaF2
•(2”x6”)
•E2
•PMT
•t1
III
•LaBr3
•(2”x2”)
•t2
•E1,E2
•CsI(NaI)
•(2”x6”)
•PMT
•T1,T2
P.Bednarczyk
Phoswich tests in Strabourg
O.Dorvaux, D.Lebhertz,
C.Finck, et al
CAEN V1751 1 or 2 GHz digitizer
NaI
TNT2 x4 (2.5 ns sampling)
LaBr3
P.Bednarczyk
Possible solutions for the PARIS FE
A hybrid consisted of analog and digital electronics
for time and energy determination respectively
Fully digital electronics with the fastest possible
flash ADC (3-8Gsample, 8 bit ?)
Milano solution: a card consisted of a first analog
stage used to shape a LaBr3 signal and a consecutive
digital part (100MHz sampling frequency) that is
used to extract both energy and time
(sub ns precision)
P.Bednarczyk
Krakow-GANIL collaboration on a common digitizer for
SPIRAL2
Krakow, April 8, 2009
Integration of the AGATA GTS
functionality with GANIL NUMEOX2
(VIRTEX)
P.Bednarczyk
AGAVA Description
MAGAVA Interface is a 1-unit wide A32D32 type VME/VXI
slave module. It is also the carrier board for the GTS (Global
Trigger and Synchronization) mezzanine card used in the AGATA
experiment for the global clock and time stamp distribution.
The main task of the AGAVA is to merge the triggerless time
stamp-based system with an acquisition system using trigger,
based on the VME or VXI Exogam-like environment.
It can also connect systems based on the triggers with the VME
Metronome and Shark_link systems.
The logic and tasks are controlled by the FPGA Virtex II Pro.
P.Bednarczyk
Example of merging ancillaries to AGATA DAQ through
AGATA VME ADAPTER
prompt trigger <500ns
GTS
supervisoSr
Digitizer
GTS
tr.
Ancillary
Analogue FEE Req.
Ancillary
VME
TrigReq. Val/Rej
GTS
AGAVA
tr.
Ancillary
readout
Pre-processing
USER provided:
P.Bednarczyk
PSA
Event Builder
Clock counter
Event Number
DATA
Slow control:
Kmax, Labview,
Midas, etc.
LLP
Ancillary Merge
Tracking
VME processor, DSP
software
NARVAL producer:
filtering, kinematics reconstr.
Data analysis
AGAVA
P.Bednarczyk
Block Diagram of NUMEXO2
•Power
•Inspections
•8 Fast ADCs
•14 bits, 100MHz
•Ethernet
•FPGA
•GTS mezzanine
•START/STOP
P.Bednarczyk
•Virtex 5
•Slow Control
•Optical Link
•(ADONIS)
•Ethernet Gbit
GTS functions embedded in the Virtex 5 of NUMEOX2
•MGT
•Clocks
•Fast serial links
•Parallel links
•Slow control
•Serial link
•Serial •Ethernet
•link
•100
•PROM
•GTS Fanin
•Delay
•Line
•Clocks
•(Local &
•Recovered)
•
P.Bednarczyk
•Flash (Linux)
•Common Logic
•Mux
•PROM
• (VHDL)
•Ethernet
•(Adonis) •Gigabit
•PPC
•(VHDL)
•Optical
• Link
•PCIe
•ADC Logic
Interface
•DPRAM
•(Physics,
•ADONIS)
ADC Logic
- FADC samples collection
- Digital Processing
- Trigger
- Data formatting
- Inspection control
•SDRAM
•SRAM
•(Oscilloscope)
•DACs
•(Test, control,
•inspection)
•FADC
The ancillary detector : Recoil Filter Detector
Installation at GASP 2008
Experiments 2009
LNL-02.07.08
P.Bednarczyk
ToF+q(g-HI) =V
Improvement of g-spectra by a coincident
recoil detection (with RFD)
92 MeV 16O + 0.4 mg/cm2 208Pb
68 MeV 18O + 0.8 mg/cm2 30Si
g-g
Pb X-rays
counts
brec~3%
gg-recoil
1200

220

800
Th X-rays



0
100
200
219
Ra
Ra
217
Ra
218


400
Th
Th
221


300
g-ray energy
400
(keV)
500
Heavy systems:
 fission background reduction
 low cross sections s ~ 0.1 mbarn
P.Bednarczyk
Large recoil velocity:
 reduction of the Doppler broadening
Estimation of a short lifetime based on the
recoil velocity measurement (with RFD)
Energy of a g-ray emitted in a target (B)
is not sufficiently Doppler corrected
A level lifetime can be expressed by
number of decays in vacuum (A) relative
to a total g-line intensity (A+B)
P.Bednarczyk
p(g9/2)1 n(g9/2)2 , Imax=49/2
69As
t ~ 40 fs  b~0.5
EUROBALL + EUCLIDES
69As
A.Bruce et al,. PRC 62 027303 (2000)
I.Stefanescu et al,. PRC 70 044304 (2004)
Variety of shapes in
40Ca(32S,3p)69As
GASP+RFD
GASP + RFD ‘2009
At HS (I~20) expected prolate SD, b=0.45
Low spin prolate triaxial, b~0.3
GS oblate b~0.3
P.Bednarczyk
Perspectives fo RFD
RFD at intense stable beams :
 EXOGAM (GANIL)
 GALILEO(GASP)
 AGATA
RFD may be a good solution for measurements with radioactive
beams
 projectiles do not irradiate any part of the setup, can be transported to a FC distant from the
experimental area.
 detectors are far from the beam-line, are not sensitive to any kind of radioactivity
 RFD doesn’t need much space, however the distance target-RFD should be adjusted to a
particular experiment in order to optimize the projectile/recoil separation and the efficiency
Possible future modifications
 replacement of scintillators by ultra fast diamond detectors
 new (more compact) chamber
 use of digitalal electonics
P.Bednarczyk