1. JRA01: ACTAR Collaboration : 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 simulations Subtask J01-1-1: Physics constraints Subtask J01-1-1: Simulations Task J01-2: Test modules Subtask J01-2-1: detection/target gas Subtask J01-2-2: Readout chamber Subtask J01-2-3: Magnetic field configuration Task J01-3: Electronics and data acquisition Task J01-4: Particle tracking

2. Task J01-1: Physics constraints and detailed simulations

3. Definition of geometry for the next generation active target Active area R 7.5 – 250 13 Altro boards 128 channels 20x200 mm (including cooling) R 300 Solenoid limit 1664 channels/quarter rosier@ipno.in2p3.fr Cylindrical geometry: symmetry around beam axis E // beam axis, uniform Projection on the endcap of the cylinder B // beam axis Anode PadsASIC cards Gangnant@ganil.fr Cathode O 50cm Quantities to be measured: curvature radius, collected charge, range, angles For 0.5 mm position resolution,  E/E=2  R/R, expected energy resolution≈100 keV for  cm >20° 50cm

4. Simulations : 78 Ni(d,p) 79 Ni  cm =20° E x =0,1.5,3 MeV E x = 0, g.s. E x = 1.5 MeV E x = 3 MeV E inc = 8.5 A.MeV D 2 at 1atm X reac = 5 cm B=2 T Hector Alvarez-Pol, Esther Estevez-Aguado, USC

5. Task J01-2: Test modules 30 cm 26 cm 20 cm 1.5 cm 1 cm 5 cm Frisch Grid Amplificación wire segmented cathode 5 mm CsI or Si wall ~50 V/cm 32 x 33 hexagonal cekk 5 mm cathod 3 test modules : MAYA First 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

6. MAYA-ITO test runs at GANIL Range of heavy ions in different gases: hydrogen, deuterium, He, Ne, Ar, Kr, isobutane Ex: 13 C results F. Rejmund et al

7. TPC for 2p radioactivity studies B. Blank et al

8. Task J01-3 Electronics 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 Orsay will allow to test ALTRO in 2007 and T2K in 2008

9. SEDI, DAPNIA T2K ASIC (Tokai to Kamioka)

10. Read-out chamber ADC 10bits 10 & 40 MHz Power hungry (35 mW/channel) ALTRO for ALICE TPC

11. Front-end ASIC Synopsis Serial Interface Trigger CK In Test 512 cells SCA FILTER Tpeak;Gain CSA 1 channel X64 BUFFER SLOW CONTROL TESTSCA MANAGER StopCK ADC Asic T2K GAIN Number of channels72Signal PolarityBoth Number of Time bins511Sampling frequency1MHz to 50MHz Dynamic range10 MIPS coded on 12bitsShaping Time 16 peak times: 100ns to 2 µ s MIP/noise 100: 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)Test1 inj. capacitor / channel I.N.L1% [0-3 MIPS];5% [3-10 MIPS]Power consumption<7.5mW/ ch From E. Delagnes, P. Baron, D. Calvet

12. 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: Need an external signal (mesh,Scintillator …) Need an external signal (mesh,Scintillator …) trigger software (efficiency) trigger software (efficiency) Front end electronics T2K with STUC

13. Software architecture based on T2K DAQ : one system Labview software UDP  USB translator Command 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

14. JRA 01 Milestones LoI presented at the SPIRAL2 SAC Meeting, October 2006 « Direct reactions with an active target » Spokerpersons: M.Chartier, D. Cortina, P. Roussel-Chomaz SAC recommendations received November 29th