GANIL Meeting November 29th, ) Discussion of ACTAR Yellow book (30 mn) 2)Simulations : Lola, Hector, Roy, Beatriz (2 h) 3)Tests with MAYA-ITO: Fanny, Laurent (30mn) 4)Tests with Bordeaux TPC: Bertram (30 mn) 5)Collaboration ACTAR-TACTIC: Roy, Alison, Patricia (30 mn) 6)Electronics, tests of existing ASICs: Roy, Lolly (1 h) 7) Summary of EURONS Meeting, Preparation of first Annual report: Fanny, Patricia (30mn) 8) Cost statement Active Target GSI : Peter, Patricia (15 mn) 9) Next meeting: When? Where? (15 mn)

Summary of EURONS Meeting Annual report due by December 12 th Publications: do not forget to acknowledge EURONS support Supported through EURONS (European Commission contract ) Publications should be sent to activity coordinator, and linked on the activity web page Web page Next meeting April , Mainz

Summary of EURONS Meeting

ACTAR Milestones

Deliverables

R3B cost statement Detector cell/Mechanics30 kEuros Cables/Crates/data acquisition200 kEuros New ASIC development150 kEuros Ancillary detector (Si+CsI telescope)725 kEuros Solenoid kEuros, to be studied N.B. MAYA: Detector+Tank: 25 kEuros Electronics/cables: 80 kEuros Acquisition (crates, CRAMS): 40 kEuros Si detectors (3 rows of 5, 5*5 cm 2 ):50 kEuros CsI detectors: 55 kEuros (+25 kEuros 2006) Total : 275 kEuros Planar Ge detectors: 5*5*2 cm 3 segmented in 25 = 70 k Euros after negociation !!!!

Simulations Use of FEMLAB at Liverpool? TRIUMF/TACTIC: Development of advanced tools by G. Ruprecht. Event generator + GEANT4: geometry+ physics processes + Monte Carlo + Femlab/Garfield In beam tests at Saclay and Bordeaux: direct light ion beams. When? Tests of different readout systems: wires (GANIL), Gems (Bordeaux), Micromegas (Saclay) Electronics/TRIUMF: FADC 50 Mhz 12 bits ready to be tested. Database open by Pierre Andre Amaudruz to collect ASIC’s spec’s: open-card.org Fund request made by TRIUMF to build GEMS and develop ASICs Ancillary detectors: wall of Si (Lolly)?? Magnetic field: Herve has officially asked to transfer SOLENO at GANIL (2 superconducting Coils 3T large solid angle) Questions/Information

Task 2-1 and 2-2: Detection gas/ Readout chamber Tests of different readout systems: wires (GANIL), Gems (Bordeaux), Micromegas (Saclay) – for wires: test of different configurations e.g. alternance of amplification wire and mass wire -for Gems: induction/granularity -for Micromegas? Definition of quality criteria -energy resolution (total charge) -range resolution -position resolution (–> angular resolution and vertex)

Task 2-2: Readout chamber Gases study: Determine  E/  x curve, TRIM calculation : factor 6 between the  E/  x at the Bragg peak and at the low ionization part of the curve (10 MeV proton in 1 atm C 4 H 10 ). MAYA : factor ≈ 2. This is coming from the detector response (induced charge). But for the GEM the response will be different (direct charge collection) and this point is critical for the electronics specification, as the dynamics of the preamplifiers. Localization: GEM readout is mainly based on charge collection Studies done by Carleton University : difficult and not efficient to use the induced signal on the pads in the vicinity). Charge may be collected on a single pad. Same algorithm as for MAYA cannot be used. 3 solutions: - Decrease the size of the pixels - Spread the charge on several pads, ex: Carlton Univ. - Combination of both charge dispersion and small pixels.

Task 2-2: Readout chamber

8 Li( ,n) 11 B 7 Be(p,p)

TPC De Geronimo IEEE 51 (2004) ≈ 8000 channels Pads= 24 concentric circles 5mm radial pitch, 2mm angular pitch (zigzag) LEGS experiment Detection of pions

BoNuS at CEBAF

BONUS