1. SiTPC status in Saclay David Attié SiTPC Phone Meeting,
P. Colas; X. Coppolani;
E. Delagnes; J. Derre;
E. Ferrer Ribas; Y. Giomataris;
A. Giganon; M. Riallot
SiTPC Phone Meeting,
NIKHEF – 20 February 2008
SiTPC Phone Meeting, NIKHEF –

2. SiTPC Phone Meeting, NIKHEF – 20.02.2008
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
SiTPC Phone Meeting, NIKHEF –

3. SiTPC Phone Meeting, NIKHEF – 20.02.2008
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)
SiTPC Phone Meeting, NIKHEF –

4. SiTPC Phone Meeting, NIKHEF – 20.02.2008
Melted bonding wires
The first one appears after an all-night standing sparking state
The second, probably during a powering down
After reparation, the first chip (mesh tested in air up to 650 V) did not recover and the second works fine
SiTPC Phone Meeting, NIKHEF –

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
SiTPC Phone Meeting, NIKHEF –

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
SiTPC Phone Meeting, NIKHEF –

7. Micro-TPC TimePix/Micromegas : mode Time
Puce Timepix
+ SiProt 20 μm
+ Micromegas
90Sr
Ar  He
Mode Time
z ~ 40 mm
Vmesh = -340 V
SiTPC Phone Meeting, NIKHEF –

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
SiTPC Phone Meeting, NIKHEF –

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
SiTPC Phone Meeting, NIKHEF –

10. Drift velocity measurement using TimePixsx sy st
Fitted with a gaussian x y t
Fitted with ft
Ar/Iso (95:5)
Edrift~500 V/cm
Example:
Histo x  σx
Histo y  σy
Histo time  σt
Example:
σr = cm
σt = us
Vdrift = 2.98 cm/μs
Simulation GARFIELD :
Edrift (500 V/cm) ~ 3.2 cm/μs
SiTPC Phone Meeting, NIKHEF –

11. Drift velocity measurement using TimePix
Argon/Isobutane (95:5)
Clock = 40 Mhz
Clock = 67 Mhz
SiTPC Phone Meeting, NIKHEF –

12. Pixel cluster multiplicities
Multiplicity = 1
Multiplicity = 3
Multiplicity = 5
Multiplicity = 2
Multiplicity = 4
Multiplicity = 6
SiTPC Phone Meeting, NIKHEF –

13. Histogram of the pixel cluster multiplicities
Example:
Mean ~ 2.5
Pixel cluster multiplicity
SiTPC Phone Meeting, NIKHEF –

14. Histogram of all events for 55Fe
SiTPC Phone Meeting, NIKHEF –

15. SiTPC Phone Meeting, NIKHEF – 20.02.2008
TimePix panel
SiTPC Phone Meeting, NIKHEF –

16. SiTPC Phone Meeting, NIKHEF – 20.02.2008
TimePix panel
Bottom side
SiTPC Phone Meeting, NIKHEF –

17. SiTPC Phone Meeting, NIKHEF – 20.02.2008
TimePix panel
Top side
SiTPC Phone Meeting, NIKHEF –

18. SiTPC Phone Meeting, NIKHEF – 20.02.2008
TimePix panel
Bottom side
SiTPC Phone Meeting, NIKHEF –

19. SiTPC Phone Meeting, NIKHEF – 20.02.2008
TimePix panel
Top side
SiTPC Phone Meeting, NIKHEF –

20. SiTPC Phone Meeting, NIKHEF – 20.02.2008
TimePix panel
Top side
SiTPC Phone Meeting, NIKHEF –

21. SiTPC Phone Meeting, NIKHEF – 20.02.2008
TimePix panel
Bottom side
SiTPC Phone Meeting, NIKHEF –

22. SiTPC Phone Meeting, NIKHEF – 20.02.2008
Micromegas panel
Saclay
Cornell
SiTPC Phone Meeting, NIKHEF –

23. SiTPC Phone Meeting, NIKHEF – 20.02.2008
Micromegas panel
Saclay
Cornell
SiTPC Phone Meeting, NIKHEF –