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

Task J01-1: Physics constraints and detailed simulations

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

rosier@ipno.in2p3.fr

Cylindrical geometry: symmetry around beam axis E // beam axis, uniform Projection on the endcap of the cylinder B // beam axis AnodePadsASIC cards

Gangnant@ganil.fr

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

TPC for 2p radioactivity studies

B. Blank 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

SEDI, DAPNIA

T2K ASIC (Tokai to Kamioka)

Read-out chamber

ADC 10bits10 & 40 MHzPower hungry (35 mW/channel)

ALTRO for ALICE TPC

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