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GEM+Timepix2 in the framework of CERN@SCHOOL project. Gabriele Croci , Matteo Alfonsi on behalf of CERN-GDD Group RD51 Miniweek , 23-25 February 2010. Motivations. - PowerPoint PPT Presentation
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GEM+Timepix2 in the framework
of CERN@SCHOOL projectGabriele Croci, Matteo Alfonsi
on behalf ofCERN-GDD Group
RD51 Miniweek, 23-25 February 2010
G.Croci - GEM+TimePix2 - CERN@School 2
Motivations
• Build a small TPC equipped with MPGDs+TimePix chip gives the possibility to measure tracks for different particles (MIPs, HIPs,…)– Very interesting for a teaching purpose– …but also for measurements of basic physics (e.g.
measurement of cluster size and distribution,..)• MPGD+TimePix2 detectors have been already
implemented by other groups in RD51 -> a lot of experience is already present in the collaboration
G.Croci - GEM+TimePix2 - CERN@School 3
Examples of MPGDs+TimePix2 (1)Ingrid + TimePix small TPC
55 FePaul Colas (CEA), 3rd RD51 Collaboration Meeting Crete
Timepix chip + SiProt + Ingrid:
90 SrB= 1 T
L. De Nooij (NIKHEF), RD51 Workshop, Amsterdam
G.Croci - GEM+TimePix2 - CERN@School 4
Examples of MPGDs+TimePix2 (2)Triple GEM (Standard) + TimePix
U. Renz et Al, Activities on Si-TPC , Micro Pattern Gas Detectors. Towards an R&D Collaboration, CERN, Sept 2007
Triple GEM (Fine Pitch) + TimePix
e- beam
Triple GEM TPC equipped with TimePix2 Chip
J. Kaminski et Al, Measurements during the October test beam with the GEMTPC and Timepix, 4th RD51 Collab Meeting
µ- beam
G.Croci - GEM+TimePix2 - CERN@School 5
GEM+TimePix Project for CERN@SCHOOL• Small TPC (1 cm drift gap) • Amplification given by a Triple GEM or a Double GEM stage• Readout by TimePix Chip• Build the TPC on top of TimePix PCB that will serve as
backplane; the TPC must be only on top of the chip
PCB used for Si+TimePix:It will be redesigned
Pad for the chip
The gas volume will be limited this area
6
Specifications• We want to have a miniaturized detector in order to get a good
portability: the GEM active area will be less than 2 cm* 2 cm• We want to have an “almost” sealed detector: change the gas
once per year– > Material selection is very important: no outgassing material
-> use ceramic PCB instead of FR4-> use a non-outgassing material for GEM frames (like Peek)
• We want to test both double GEM and Triple GEM– > Double GEM with respect to Triple GEM (at the same
effective gain) gives the possibility to have more charge per pixel since it introduces less diffusion
• Test Standard GEM and Fine Pitch (see later) GEM• Both Triple and Double GEM will be powered using resistor
divider: we have to design a small high-power HV divider chain – In RD51 we know that there are groups that are developing portable HV : joining
efforts can be usefulG.Croci - GEM+TimePix2 - CERN@School
G.Croci - GEM+TimePix2 - CERN@School 7
State of the art
• We have already designed the GEMs and they are in production
• The first test of this GEM will be made in standard detector boxes without chips
• We are going to design the small HV resistor chain
• We are looking for non-outgassing materials
8
GEM Design
14.08 mm
14.0
8 m
m ~ 16 mm
Timepix active area
Timepix logic
~ 19.5 mm
~19.5 mm
15 m
m
17 mm
1 mm
4 mm2 mm hole diameter(smaller marker)
8 mm
8 mm
11 mm3 m
m
3 m
m
Minimum size 43 mm
2 mmGEM has been designed in order to cover only the active area of the chip
Pad for the chip
G.Croci - GEM+TimePix2 - CERN@School
G.Croci - GEM+TimePix2 - CERN@School 9
GEM DimensionsPitch Hole Diameter Thickness
Standard GEM 140 µm 50 µm 50 µm
Fine Pitch GEM 1 60 µm 30 µm 50 µm
Fine Pitch GEM 2 50 µm 25 µm 25 µm
All the three geometries will be tested
G.Croci - GEM+TimePix2 - CERN@School 10
Conclusion and future plan
• We are just at the beginning of the project• First test of GEMs in 2 weeks• This is a “small” (in dimensions) but big
project: a lot of R&D is required!!!
Any advise is welcome!!!!!