Darsebury 12-13 June - Lolly

ACTAR

Darsebury 12-13 June - Lolly

20 40 60 80 100 120 140 160

0.1

1

10

100

Ere

coil (

Me

V)

lab

(deg)

132Sn(p, p) E=740 MeV/u, E* = 0 MeV

18C(, ) E=400 MeV/u, E* = 0 MeV

18C(p, p') E=400 MeV/u, E* = 25 MeV

196Pb(, ') E=400 MeV/u, E* = 15 MeV

196Pb(3He, t) E=400 MeV/u, E* = 0 MeV

12Be(3He, t) E=400 MeV/u, E* = 0 MeV

22C(p, d) E=15 MeV/u, E* = 0 MeV

132Sn(d, p) E=15 MeV/u, E* = 0 MeV

Si – TOF/ Active Target

Si - PSD

Si – DE-E

Si/CsI - Tracking

SPIRAL2

NuStar

A 50 keV resoln 1019 target optionSi - detectors

Darsebury 12-13 June - Lolly

Sum Numbers

• Proton at 2 MeV in Si

• Range ~ 50 µm

• C3H6 0.25 mg/cm² = 1019

• Resoln ~ 50 KeV

• Resoln ~0.3°

• Protons 30 MeV• Range 5 mm Si

• Protons at 2 MeV (0.15 MeV) in H2 1 atm

• Range 32 cm (0.42 cm)

• H2 gas 10 cm = 3.1020

• Resoln 40 KeV (30 keV)

• Ne = 125e-/mm (750e- /mm)

• Resoln ~ 2°

• Protons 30 MeV• Range 45,000 mm

Darsebury 12-13 June - Lolly

• Dynamic range for p or alphas x10 to x20

• Resolutions for Bragg (Z & A) is approx 15% for Micromegas – is this enough for Z resoln.

• Can we get 40keV resoln in energy? What is the resoln. that we request.

Darsebury 12-13 June - Lolly

Large angle scattering:No magnet option.

• Estimates on Range of p in H2

• Thresh at 1 Atm ~ 0.5 MeV

• Thresh at 0.1 Atm ~ 0.1 MeV

• 1021 target

• Gamma detection possible

50 cm

20 40 60 80 100 120 140 160

0.1

1

10

100

Ere

coil (

MeV

)

lab

(deg)

132Sn(p, p) E=740 MeV/u, E* = 0 MeV

18C(, ) E=400 MeV/u, E* = 0 MeV

18C(p, p') E=400 MeV/u, E* = 25 MeV

196Pb(, ') E=400 MeV/u, E* = 15 MeV

196Pb(3He, t) E=400 MeV/u, E* = 0 MeV

12Be(3He, t) E=400 MeV/u, E* = 0 MeV

22C(p, d) E=15 MeV/u, E* = 0 MeV

132Sn(d, p) E=15 MeV/u, E* = 0 MeV

Darsebury 12-13 June - Lolly

Gamma detectionin coincidence

with low energy recoils

IPN ORSAYIPN ORSAY

Darsebury 12-13 June - Lolly

Small angle scatteringNo magnet option.

• Estimates on Range of p in H2

• Thresh at 1.0 Atm ~ 0.5 MeV• Thresh at 0.2 Atm ~ 0.1 MeV

• 1021 target

50 cm

20 40 60 80 100 120 140 160

0.1

1

10

100

Ere

coil (

MeV

)

lab

(deg)

132Sn(p, p) E=740 MeV/u, E* = 0 MeV

18C(, ) E=400 MeV/u, E* = 0 MeV

18C(p, p') E=400 MeV/u, E* = 25 MeV

196Pb(, ') E=400 MeV/u, E* = 15 MeV

196Pb(3He, t) E=400 MeV/u, E* = 0 MeV

12Be(3He, t) E=400 MeV/u, E* = 0 MeV

22C(p, d) E=15 MeV/u, E* = 0 MeV

132Sn(d, p) E=15 MeV/u, E* = 0 MeV

Darsebury 12-13 June - Lolly

T2K

SEDI

CEA Saclay

Darsebury 12-13 June - Lolly

TPC for T2K

• Micromegas chosen as gas amplifier– 30x30 cm² ie 1400 of 0.8x0.8cm²

• Saclay is responsible for the FEE electronics. Namely ASIC + Front-end board+ADC

• ASIC T2K has 72 channels ie 20 chip/micomegas

• System slow 20Hz – needs trigger

Micromegas : Micro Mesh Gaseous Detector

Darsebury 12-13 June - Lolly

Some Info

• Gain options – 120, 240, 360, 600fC

• Shaping times - 0.1, …, 2µs

•

Darsebury 12-13 June - Lolly

Darsebury 12-13 June - Lolly

Darsebury 12-13 June - Lolly

Darsebury 12-13 June - Lolly

Needs

• Need to check the gain and dynamic range

• Shaping time – drift time of H2 might be too long for high pressure. Limitation approx 2µsec.

• Need to have a post doc for 12 to 18 months.

• ACTAR test set-up option ~ July 2007– Order immediately?

Darsebury 12-13 June - Lolly

• 100 e- /mm deposit• 103 - 104 gain from gas amplifier• 105 -106 e- /mm = 16 – 160fC/mm

Micromegas

Mic

rom

egas

Spat

ial r

esolu

tion

Darsebury 12-13 June - Lolly

MWPC, GEM & Micromegas Performances

MWPC GEM Micromegas

Rate capability 10^4Hz/mm^2 >5x10^5Hz/mm^2 10^6Hz/mm^2

Gain High 10^6 low 10^3 (single)

> 10^5 (multi GEM)

High > 10^5

Gain stability Drops at 10^4Hz/mm^2

Stable over 5*10^5Hz/mm^2

Stable over 10^6Hz/mm^2

2D Readout ? Not really Yes and flexible Yes, not flexible

Position resolution > 200 µm (analog) 50 µm (analog) Good < 80 µm

Time resolution ~ 100 µs < 100 ns < 100 ns

Magnetic Field effect High Low Low

Cost Expensive, fragile Cheap, robust Cheap, robust