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JRA01: ACTARCollaboration : GANIL, DAPNIA Saclay, CENBG Bordeaux, Univ. Liverpool,
Daresbury, GSI, Univ. Santiago de Compostela
Objectives: Investigate the best options for the realisation of active target detector concepts for exotic nuclei studies, and define the R&D effort.
Task J01-1: Physics constraints and detailed simulationsSubtask J01-1-1: Physics constraintsSubtask J01-1-1: Simulations
Task J01-2: Test modulesSubtask J01-2-1: detection/target gasSubtask J01-2-2: Readout chamberSubtask J01-2-3: Magnetic field configuration
Task J01-3: Electronics and data acquisition
Task J01-4: Particle tracking
Definition of geometry for the next generation active target
Active area R 7.5 – 250
13 Altro boards 128 channels20x200 mm
(including cooling)
R 300Solenoid
limit
1664 channels/quarter
Cylindrical geometry: symmetry around beam axis E // beam axis, uniform Projection on the endcap of the cylinder B // beam axis AnodePadsASIC cards
Cathode
O 50cm
Quantities to be measured: curvature radius, collected charge, range, anglesFor 0.5 mm position resolution, E/E=2R/R, expected energy resolution≈100 keV for cm>20°
50cm
Simulations : 78Ni(d,p)79Ni cm=20° Ex=0,1.5,3 MeV
Ex = 0, g.s.Ex = 1.5 MeVEx = 3 MeV
Einc= 8.5 A.MeVD2 at 1atmXreac= 5 cmB=2 T
Hector Alvarez-Pol, Esther Estevez-Aguado, USC
Task J01-2: Test modules30 cm
26 cm
20 cm
1.5 cm1 cm
5 cm
Frisch GridAmplificación wire
segmented cathode5 mm
CsI or Si wall
~50 V/cm
32 x 33 hexagonal cekk 5 mm
cathod
3 test modules :•MAYAFirst results of the new active target MAYA C. E. Demonchy et al. Jounal of Physics G 31 (2005) S1831•MAYA--ITO: measurement of ion ranges in various gases•Bordeaux TPC for 2p radioactivity studies
MAYA-ITO test runs at GANILRange of heavy ions in different gases: hydrogen, deuterium,He, Ne, Ar, Kr, isobutane
Ex: 13C results
F. Rejmund et al
Task J01-3Electronics and Data acquisition
Evaluation of existing ASICs (L. Pollacco)
3 chips can fulfill the requirements for active targets:
— GASSIPLEX (used in MAYA and MAYAITO)— ALTRO (developed for ALICE TPC)— T2K (developed for T2K experiment)
Test module under construction in collaboration with Orsaywill allow to test ALTRO in 2007 and T2K in 2008
Front-end ASIC Synopsis
Serial Interface
Trigger
CKIn Test
512 cells
SCAFILTER
Tpeak;Gain
CSA
1 channel
X64
BUFFER
SLOW CONTROLTEST SCA MANAGER
Stop CK
ADC
Asic T2K
GAIN
Number of channels 72 Signal Polarity Both
Number of Time bins 511
Sampling frequency 1MHz to 50MHz
Dynamic range 10 MIPS coded on 12bits Shaping Time16 peak times: 100ns to 2µs
MIP/noise100: 750 e- rms noise
in the 120fC range Read out frequency 20 to 25MHz
MIP value
12fC to 60 fC(4 possible gains settable by SC) Test
1 inj. capacitor / channel
I.N.L1% [0-3 MIPS];5% [3-10
MIPS]Power consumption <7.5mW/ chFrom E. Delagnes, P. Baron, D. Calvet
Prototype features • 4 AFTER chips (288 channels)• 1 STUC mother board• 1 STUC• 1 firmware (Xilinx program)• 1 softwares on PC
What others needs :• Power supply :
• 4.5V (FEC : 4.5W)• 3.3V (MB : 400mW)
•FE Shield : •Copper plan on both side
AFTER has no internal trigger:AFTER has no internal trigger:• Need an external signal Need an external signal (mesh,Scintillator …)(mesh,Scintillator …)• trigger software (efficiency)trigger software (efficiency)
Front end electronics T2K with STUC
Software architecture based on T2K DAQ : one system
Labview software
UDP USB translatorCommand Server
STUC + memory board
PC plateform
UDP
USB
Harware command
Front end or asic test bench board
C++Software:DAQ
79 channels (72 actives)x 4 AFTER x 512 cells x 12 bits ~ 2Mbits/ev
JRA 01 Milestones
Milestones[1]:M-J01-1.1.1
M-J01-1.1.2
M-J01-1.1.3
M-J01-1.2.1M-J01-1.2.2M-J01-2.1.1M-J01-2.1.2M-J01-2.1.3M-J01-2.2.1M-J01-2.2.2M-J01-2.2.3M-J01-3.1M-J01-3.2M-J01-4.1
Short title Date due[2] Date RemarkCollaboration meeting to initiate the project. Define in detail the execution plan for the first 18 months. Form working groups focusing on R&D for each task 29/01/09 29/01/09White paper
juin/ 09 nov-09Discussion of the white paper (6-7 June 2005 @ CENBG Bordeaux) 6-7Jun05 6-7June05Preliminary description of detector geometry and juil/ 10 june 06Final description of detector and geometry response Dec.07Detailed work program sep/ 09 Dec.05Installation of test benches Dec.05 sep/ 09Final description for detection/target gas Dec.07Detailed work program sep/ 09 dec.05Description of read-out chamber Dec.07Description of magnetic field options Dec.07Evaluation of existing electronics Dec.05 jan/ 10Establish specification of front end and readout Dec.07Description of tracking procedure Dec.07
LoI presented at the SPIRAL2 SAC Meeting, October 2006« Direct reactions with an active target »Spokerpersons: M.Chartier, D. Cortina, P. Roussel-ChomazSAC recommendations received November 29th