1. Gaseous detectors Task 13.4.2 Resistive anode Micromegas
Preparation for large series production:
procedures and tools for large series resistive micromegas anodes

2. Resistive anode techniques
Resistive anode stabilizes Micromegas and allows a charge spreading necessary to improve resolution of Micromegas
Can be applied to other MPGDs but necessary for Micromegas
Many open ways to be explored to apply the resistive material: screen printing, sputtering, painting, film lamination, etc…
Several techniques to measure surface resistivity of a coverlay.
Resistive anode techniques

3. Screen printing at Saclay
Saclay MPGD workshop realize Micromegas bulk detector since 3 years.
In 2014 the workshop was upgraded with a serigraphy machine in order to manufacture resistive layer on top on PCB before the bulk process.
Goal of the screen Saclay:
Find the ad hoc process to make thin strips (thin inter strips, < 100 µm) on large surface (600 mm x 600 mm)
Realize detectors with nominal resistive strips
Make tests with different patterns of resistive coating (strips, plain layer, pad,…), different resistive paste (dilution or carbon adding) and/or silver conductive paste
This new machine coming in addition to bulk workshop and serval detector test bench in the same geographic place will allow us to make fast R&D iteration.
Screen printing at Saclay

4. The screen-printing machine
The Argon Unostar E machine is a professional tool well suited to the type of resistive polymer to be used.
Max possible area : 700 mm * 700 mm
Investment : 30 k€
Tests being carried out at the Saclay bulk lab (300 microns pitch)
See S. Aune’s talk RD51
The screen-printing machine

5. Project characteristics
Project leader : Stephan Aune
Beneficiary : CEA
Net EU contribution : 65 k€
Milestones (internal) : Purchase of material, screen design, Screen printing tests (M12), resistivity measurement techniques, tool design and purchase (M24); redaction of the protocol. Reports in RD51.
Deliverable : Resistive anode manufacturing (protocols and tools for the large-size and large-scale production of resistive anodes for MICROMEGAS)
Project characteristics

6. Gaseous detectors Task 13.4.7 MPGD detectors to industry
Preparation for large series production: standard production protocols of optimized MPGD components to ease technology dissemination

7. Precise etching on large area PCBs (Atlas/NSW, Compass, …)
Multilayer stacking
Layers alignment
Strips and pitch accuracy over large length (>2m)
Gluing process
Pillars manufacturing
Metrology
PCB thickness
Bulk (physics and imaging project, industrialization, …)
Mapping
Resistive layers (Atlas/NSW, Compass, TD2DM2, …)
Alternative read-out (Gbar, large area tomo, …)
Substrates quality
Masks alignment
2D read-out
Resistivity homogeneity
Multiplexing and mosaïc
Large areas
Connectics
Buried resistors
New geometries
Roadmap (R&D axis)

8. AIDA2020
Roadmap (timeline)

9. Project characteristics
Project leader : Fabien Jeanneau
Beneficiary : CEA
Other contributors : CERN, …
Net EU contribution : 35 k€
Milestones: Protocol and specifications for MPGD production and quality control (M36)
Internal Milestones: orders of detector series to at least two PCB companies (M8) characterization and tests and iterations.
Deliverable. Report on working detectors.
Project characteristics