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[email protected] SiTPC Phone Meeting, NIKHEF – 20.02.2008 1
SiTPC status in SaclaySiTPC status in Saclay
David AttiéP. Colas; X. Coppolani;
E. Delagnes; J. Derre;
E. Ferrer Ribas; Y. Giomataris;
A. Giganon; M. Riallot
SiTPC Phone Meeting, NIKHEF – 20 February 2008
[email protected] SiTPC Phone Meeting, NIKHEF – 20.02.2008 2
News
• Second Micro-TPC available soon
• TimePix works with USB1.1 readout (but Clock < 7 MHz)
• First measurements in Helium– 55Fe source– 90Sr source
• Preliminary data analysis
• The TimePix panel with a matrix of 2x4 chips have been designed and will be delivered next Tuesday official release planned for March 17th EUDET SC meeting
• The Micromegas panel designed at Saclay fits to the endplate
[email protected] SiTPC Phone Meeting, NIKHEF – 20.02.2008 3
Micro-TPC prototype
• A second detector will be available next week, for the community?
• But, we need an extra readout system (MUROS or USB1.2)
[email protected] SiTPC Phone Meeting, NIKHEF – 20.02.2008 4
Melted bonding wires
• After reparation, the first chip (mesh tested in air up to 650 V) did not recover and the second works fine
• The first one appears after an all-night standing sparking state• The second, probably during a powering down
[email protected] SiTPC Phone Meeting, NIKHEF – 20.02.2008 5
Micro-TPC TimePix/Micromegas : mode Time
• Puce Timepix+ SiProt 20 μm+ Micromegas
• 55Fe
• Ar/Iso (95:5)
• Mode Time
• z ~ 40 mm
• Vmesh = -340 V
[email protected] SiTPC Phone Meeting, NIKHEF – 20.02.2008 6
Micro-TPC TimePix/Micromegas : mode Time
• Puce Timepix+ SiProt 20 μm+ Micromegas
• 90Sr
• Ar/Iso (95:5)
• Mode Time
• z ~ 40 mm
• Vmesh = -340 V
[email protected] SiTPC Phone Meeting, NIKHEF – 20.02.2008 7
Micro-TPC TimePix/Micromegas : mode Time
• Puce Timepix+ SiProt 20 μm+ Micromegas
• 90Sr
• Ar He
• Mode Time
• z ~ 40 mm
• Vmesh = -340 V
[email protected] SiTPC Phone Meeting, NIKHEF – 20.02.2008 8
Micro-TPC TimePix/Micromegas : mode Time
• Puce Timepix+ SiProt 20 μm+ Micromegas
• 90Sr
• He/Iso (80:20)
• Mode Time
• z ~ 40 mm
• Vmesh = -430 V
[email protected] SiTPC Phone Meeting, NIKHEF – 20.02.2008 9
Micro-TPC TimePix/Micromegas : mode Time
• Puce Timepix+ SiProt 20 μm+ Micromegas
• 55Fe
• He/Iso (80:20)
• Mode Time
• z ~ 60 mm
• Vmesh = -430 V
[email protected] SiTPC Phone Meeting, NIKHEF – 20.02.2008 10
sxsy
st
Fitted with a gaussian x y
t
Fitted with a gaussian
Fitted with ft
Ar/Iso (95:5) Edrift~500 V/cm
Example:
Drift velocity measurement using TimePix
tσ)tx(
tt e
σ)tx(
A)x(f0
20
t
yx
t
rdrift σ
σσ
2
1σσ
V22
Example:
• σr = 0.129 cm• σt = 0.0432 us
Vdrift = 2.98 cm/μs
Simulation GARFIELD : Edrift (500 V/cm) ~ 3.2 cm/μs
• Histo x σx
• Histo y σy
• Histo time σt
[email protected] SiTPC Phone Meeting, NIKHEF – 20.02.2008 11
Drift velocity measurement using TimePix
• Argon/Isobutane (95:5)
• Clock = 67 Mhz• Clock = 40 Mhz
[email protected] SiTPC Phone Meeting, NIKHEF – 20.02.2008 12
Multiplicity = 6
Pixel cluster multiplicities
Multiplicity = 5
Multiplicity = 4
Multiplicity = 3
Multiplicity = 2
Multiplicity = 1
[email protected] SiTPC Phone Meeting, NIKHEF – 20.02.2008 13
Histogram of the pixel cluster multiplicities
Pixel cluster multiplicity
• Example:
Mean ~ 2.5
