Piotr Bednarczyk Instytut Fizyki Jdrowej im Henryka Niewodniczaskiego
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 La. Br 3(Ce), (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, resolution sumenergy detector (calorimeter) and detector for the gamma-transition up 10 Me. V with medium energy resolution (better than 3%). 3% It will serve also for fast timing application (Dt<1 ns). t<1 ns Outer sphere, sphere with lower granularity but with high volume detectors, rather long( at least 5 inches), could be made from conventional crystals (Ba. F 2 or Cs. I), 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 La. Br 3: risetime <1 ns, decaytime ~20 ns Stand rates up to 100 k. Hz 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 Me. V 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 • E 1 I • La. Br 3 • (2”x 2”) • Cs. I or Ba. F 2 • (2”x 6”) • PMT • E 2 • PMT • t 1 • t 2 • E 1 • APD II • La. Br 3 • (2”x 2”) • Cs. I or Ba. F 2 • (2”x 6”) • E 2 • PMT • t 1 III • La. Br 3 • (2”x 2”) • Cs. I(Na. I) • (2”x 6”) • t 2 • E 1, E 2 • PMT • T 1, T 2 P. Bednarczyk
Phoswich tests in Strabourg O. Dorvaux, D. Lebhertz, C. Finck, et al CAEN V 1751 1 or 2 GHz digitizer Na. I TNT 2 x 4 (2. 5 ns sampling) La. Br 3 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 -8 Gsample, 8 bit ? ) Milano solution: a card consisted of a first analog stage used to shape a La. Br 3 signal and a consecutive digital part (100 MHz sampling frequency) that is used to extract both energy and time (sub ns precision) P. Bednarczyk
Krakow-GANIL collaboration on a common digitizer for SPIRAL 2 Krakow, April 8, 2009 Integration of the AGATA GTS functionality with GANIL NUMEOX 2 (VIRTEX) P. Bednarczyk
AGAVA Description MAGAVA Interface is a 1 -unit wide A 32 D 32 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 <500 ns GTS superviso. Sr Digitizer GTS tr. Ancillary Analogue FEE Req. Ancillary VME Trig. Req. Val/Rej GTS AGAVA tr. Clock counter Event Number DATA Ancillary readout Pre-processing USER provided: Slow control: Kmax, Labview, Midas, etc. P. Bednarczyk LLP PSA Event Builder Ancillary Merge Tracking VME processor, DSP software NARVAL producer: filtering, kinematics reconstr. Data analysis
AGAVA P. Bednarczyk
Block Diagram of NUMEXO 2 • Power • Inspections • 8 Fast ADCs • 14 bits, 100 MHz • GTS mezzanine • START/STOP P. Bednarczyk • FPGA • Virtex 5 • Ethernet • Slow Control • Optical Link • (ADONIS) • Ethernet Gbit
GTS functions embedded in the Virtex 5 of NUMEOX 2 • MGT • Clocks • Fast serial links • Parallel links • Slow control • Serial link • Serial • Ethernet • link • 100 • PROM • Mux • GTS Fanin • Delay • Line • Clocks • (Local & • Recovered) • P. Bednarczyk - Trigger - Data formatting - Inspection control • SDRAM • ADC Logic Interface • DPRAM • (Physics, • ADONIS) ADC Logic - FADC samples collection - Digital Processing • PROM • (VHDL) • Flash (Linux) • PPC • Common Logic • (VHDL) • Optical • Link • PCIe • Ethernet • (Adonis) • Gigabit • 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 To. F+q(g-HI) =V
Improvement of g-spectra by a coincident recoil detection (with RFD) 92 Me. V 16 O + 0. 4 mg/cm 2 208 Pb 68 Me. V 18 O + 0. 8 mg/cm 2 30 Si brec~3% Heavy systems: ü fission background reduction ü low cross sections s ~ 0. 1 mbarn P. Bednarczyk Large recoil velocity: ü reduction of the Doppler broadening
Estimation of a short lifetime recoil velocity measurement based on the (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
Variety of shapes in 69 As t ~ 40 fs ® b~0. 5 EUROBALL + EUCLIDES 69 As A. Bruce et al, . PRC 62 027303 (2000) I. Stefanescu et al, . PRC 70 044304 (2004) p(g 9/2)1 n(g 9/2)2 , Imax=49/2 40 Ca(32 S, 3 p)69 As 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 at intense stable beams : Ø EXOGAM (GANIL) Ø GALILEO(GASP) Ø AGATA RFD may be a good solution for measurements with radioactive beams ü projectiles do not irradiate any part of the setup, can be transported to a FC distant from the experimental area. ü detectors are far from the beam-line, are not sensitive to any kind of radioactivity ü 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 ü replacement of scintillators by ultra fast diamond detectors ü new (more compact) chamber ü use of digitalal electonics P. Bednarczyk
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