GEMTimepix 2 in the framework of CERNSCHOOL project

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GEM+Timepix 2 in the framework of CERN@SCHOOL project Gabriele Croci, Matteo Alfonsi on behalf

GEM+Timepix 2 in the framework of [email protected] project Gabriele Croci, Matteo Alfonsi on behalf of CERN-GDD Group RD 51 Miniweek, 23 -25 February 2010

Motivations • Build a small TPC equipped with MPGDs+Time. Pix chip gives the possibility

Motivations • Build a small TPC equipped with MPGDs+Time. Pix 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+Time. Pix 2 detectors have been already implemented by other groups in RD 51 -> a lot of experience is already present in the collaboration G. Croci - GEM+Time. Pix 2 - [email protected] 2

Examples of MPGDs+Time. Pix 2 (1) Ingrid + Time. Pix small TPC 55 Fe

Examples of MPGDs+Time. Pix 2 (1) Ingrid + Time. Pix small TPC 55 Fe Paul Colas (CEA), 3 rd RD 51 Collaboration Meeting Crete Timepix chip + Si. Prot + Ingrid: Sr B= 1 T 90 G. Croci - GEM+Time. Pix 2 - [email protected] L. De Nooij (NIKHEF), RD 51 Workshop, Amsterdam 3

Examples of MPGDs+Time. Pix 2 (2) Triple GEM (Standard) + Time. Pix Triple GEM

Examples of MPGDs+Time. Pix 2 (2) Triple GEM (Standard) + Time. Pix Triple GEM (Fine Pitch) + Time. Pix e- beam U. Renz et Al, Activities on Si-TPC , Micro Pattern Gas Detectors. Towards an R&D Collaboration, CERN, Sept 2007 Triple GEM TPC equipped with Time. Pix 2 Chip µ- beam G. Croci - GEM+Time. Pix 2 - [email protected] J. Kaminski et Al, Measurements during the October test beam with the GEMTPC and Timepix, 4 th 4 RD 51 Collab Meeting

GEM+Time. Pix Project for CERN@SCHOOL • • Small TPC (1 cm drift gap) Amplification

GEM+Time. Pix Project for [email protected] • • Small TPC (1 cm drift gap) Amplification given by a Triple GEM or a Double GEM stage Readout by Time. Pix Chip Build the TPC on top of Time. Pix PCB that will serve as backplane; the TPC must be only on top of the chip PCB used for Si+Time. Pix: It will be redesigned The gas volume will be limited this area Pad for the chip G. Croci - GEM+Time. Pix 2 - [email protected] 5

Specifications • We want to have a miniaturized detector in order to get a

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 FR 4 -> 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 RD 51 we know that there are groups that are developing portable HV : joining 6 efforts can be useful G. Croci - GEM+Time. Pix 2 - [email protected]

State of the art • We have already designed the GEMs and they are

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 G. Croci - GEM+Time. Pix 2 - [email protected] 7

Pad for the chip 11 mm 3 mm ~19. 5 mm 3 mm GEM

Pad for the chip 11 mm 3 mm ~19. 5 mm 3 mm GEM Design 8 m Timepix logic 1 mm 15 mm 17 mm ~ 19. 5 mm Timepix active area ~ 16 mm 14. 08 mm 8 m m GEM has been designed in order to cover only the active area of the chip 2 mm hole diameter (smaller marker) G. Croci - GEM+Time. Pix 2 - [email protected] 2 mm 4 mm Minimum size 43 mm 8

GEM Dimensions Pitch Hole Diameter Thickness Standard GEM 140 µm 50 µm Fine Pitch

GEM Dimensions Pitch Hole Diameter Thickness Standard GEM 140 µm 50 µm Fine Pitch GEM 1 60 µm 30 µm 50 µm Fine Pitch GEM 2 50 µm 25 µm All the three geometries will be tested G. Croci - GEM+Time. Pix 2 - [email protected] 9

Conclusion and future plan • We are just at the beginning of the project

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!!!!! G. Croci - GEM+Time. Pix 2 - [email protected] 10