Darsebury 12-13 June - Lolly ACTAR. Darsebury 12-13 June - Lolly Si – TOF/ Active Target Si - PSD...
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Transcript of Darsebury 12-13 June - Lolly ACTAR. Darsebury 12-13 June - Lolly Si – TOF/ Active Target Si - PSD...
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
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
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