JRA01: ACTAR

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 J01-1Physics constraints and detailed

simulations

Subtask J01-1-1: Physics constraintsTask leader: B. BlankWhite paper achieved in November 2005available via ftp://ftpcenbg.in2p3.fr/pub/nex/ACTAR

Subtask J01-1-1: SimulationsTask leader: D. CortinaFramework constructed, first simulations performed

Overview of ActarSim

H. Alvarez Pol USC

ActarSim : geometry

Physics constraints and simulations

— Large dynamics needed: 0.2-20 MeV— Either magnetic field or ancillary detectors (many)— Energy resolution:

50 keV for Si detectors=>10% at 0.5 MeV, 0.5% at 5 MeV

Position resolution 0.25mm=>2.5% for 1cm, 0.25% for 10cm

—Cubic geometry :Problem with deflection of the beam with BSolid angle reduced by factor 2(4)

—Cylindrical geometry: Problem at small angles (ancillary detectors below 5°)Varying rise times of the pulses

—Preliminary simultations in favor of cylindric geometry with longitudinal electric and magnetic field for reactions related toresonant elastic scattering, inelastic scattering (giant resonances) and transfer reactions.

2 main questions: Cubic or Cylindrical geometry? Magnetic field or not?

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 J01-2Test modules

Subtask T-J01-2-1: detection/target gasSubtask T-J01-2-2: readout chamberSubtask T-J01-2-3: magnetic field configuration

For subtasks 1 and 2:Three test modules within ACTAR:

Bordeaux TPC (B. Blank et al) using GEMSMAYA (W. Mittig, H. Savajols) and MAYAITO(F. Rejmund, A. Villari), both at GANIL and using wires

Contact established with TACTIC group (York, TRIUMF)

New test module under construction in collaboration with IPN Orsayand LAL for MICROMEGAS

Bertram Blank, CENBG

TPC for 2p radioactivity studies

Daughter boards

Hybrid boards

GEM: Gas electron multiplierbeam

1500 electronics channels

Hybrid boards

Daughter boards

TPC for 2p radioactivity studies

TPC chamber

Detector mount

Detector mount

Electronics card

Strip-strip matrix

GEM

= 70md = 100m

TPC for 2p radioactivity studies

TPC for 2p radioactivity studies

x energy | x time | y energy | y time

Implantation at entrance Implantation at end

saturation

Different implantation depths by changing the B

Entrance of TPC Center of TPC End of TPC

Threshold for implantation events

Threshold for radioactivity events

48Ca + 9Be 26P, 25Si,….

x

y

beam

Silicon detector

TPC: implantation events

x energy | x time | y energy | y time

Collimated source -delayed decay

-delayed decay -delayed decay

x

y

beam

Silicon detector

TPC : Decay events

MAYA-ITO test runs at GANIL

F. Rejmund et al.

MAYA-ITO test runs at GANIL

Beams used 13C @ 3 - 4.35 - 11MeV/u16O @ 3.4 - 8.4 MeV/u36S @ 3.92 - 11.32 MeV/u208Pb @ 4.5 MeV/u

Gases:H,D,He,Ne,Ar,Xe, Isobutane

Gas (STP)

[mg/cm3] Pressure [mbar]

Inflexion point [mm]

(Expt.)

Inflexion point [mm]

(SRIM]

Inflexion Point [mm] (Expt)

Inflexion Point [mm]

(SRIM)

Range [mm]

(SRIM)

Ne 0.9 1500 120.9 115.6 123.2 Ne 0.9 1860 97.0 93.2 100.7 98.36 99.4 Ar 1.78 710 162.9 152.’ 161.5 Ar 1.78 1005 114.1 107.7 114.9 112.6 114.1 Xe 5.85 500 108.6 123.9 110.0 107.8 124.8

Isobutane 2.59 500 81.6 73.4 81.6 73.65 75.2

H2 0.09 1800 148.95 141.9 150.9 162.8 152.8 D2 0.18 1800 149.22 150.5 160.3 D2 0.18 1950 137.6 138.9 138.8 146.7 148.0 He 0.18 1900 173.4 188.5 173.7 199.6 207.8

(a) Ion: 13C 4.35 MeV/n ( ~ 56 MeV after the 1.5 m myler window)

(a1) Ion: 13C 3.01 MeV/n ( 38.4~ MeV after the 1.5 m myler window)

MAYA-ITO test runs at GANIL: 13C results

(a2) Range Straggling. Ion: 13C 4.35 MeV/n

Gas pressure Straggling exp [mm]

Straggling SRIM [mm]

Ne 0.9 1860 5.3 6.5 Ar 1.78 1005 2.5 2.2 Xe 5.85 500 3.6 2.2 C4H10 2.59 500 4.1 1.38

MAYA-ITO test runs at GANIL: 13C results

Gas (STP)

[mg/cm3] Pressure [mbar]

Range [mm] (Expt.)

Range [mm] (SRIM)

Xe 5.85 1500 153.8 149.2 Isobutane 2.59 1880 105.7 98.2

TRIUMF Annular Chamber for the Tracking and

Identification of Charged Particles

Original concept: L. Buchmann, TRIUMF

TACTIC: York-TRIUMF Collaboration

How is it going to work?

● 90% helium 10% CO2 gas mixture● Pressure of a few hundred mbar● Drift voltage ~100V/cm

Task J01-3Electronics and Data acquisition

Evaluation of existing ASICs

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

L.Pollacco

T2K ASIC (Tokai to Kamioka)

Read-out chamber

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

ALTRO for ALICE TPC

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

JRA 01 Budget

Remarks-France: all budget for personnel has been given to GANIL which redistributes to Bordeaux and Saclay. One postdoc starts at Bordeaux on December 15th for 9 months. Saclay will have 8 months in 2007.-Spain (USC):one sudent has also started-GB (Liv+Daresbury): a large fraction of budget spent

Remark: ACTAR probably extended until the end of Eurons (instead of end 2007)

Ganil Bordeaux Saclay CCLRC Liverpool USC GSI

Detector: double-sided microstrip detector (CERN)

GEM: Gas electron multiplier (CERN)

Detector gas: P10 at 1atm

Active detection volume: 15 x 15 x 15 cm3

ASICS: VAT/TAT by IDEAS, Norway

TAC window: 10 s

channels per chip: 32 time and energy

Electronics and data acquisition: PXI – VME

Dead time: 1.5 ms (max)

4 GEMs to increase the gain

new a source collimation system

non-linearity of the gain (-30% on sides)

retract drift frames

TPC for 2p radioactivity studies