Rui De Oliveira Vienna March 2014 Industrialisation of Micromegas detector for ATLAS Muon spectrometer upgrade 1

Principle of the detectorPrinciple of the detector Structure of the detector : BULK or STDStructure of the detector : BULK or STD Production techniquesProduction techniques Technology transfer to industry statusTechnology transfer to industry status Other similar projectsOther similar projects PricesPrices OUTLINE 2

Principle 3

Resistive Bulk Micromegas real cross section 4

Read-out board with Cu strips and resistive strips Laminated Photoimageable coverlay Frame SS Stretched mesh on metal frame Laminated Photoimageable coverlay Exposure Development + cure BULK Micromegas production steps 5

BULK Micromegas examples Largest size produced: 1.5m x 0.6m Limited by equipment BULK Technology DUPONT PC 1025 coverlay BOPP Meshes T2K ILC DHCAL 6

Read-out board with CU strips and Res strips Laminated Photoimageable coverlay SS Mesh on metallic frame Exposure Development + cure STD Micromegas detector production steps 7

STD Micromegas structure Mechanical support Drift electrode Pillars (128 µm) 8

Mechanical support STD Micromegas structure 9

Limited dead zones at the edge ( good for TPC application) The PCB is the detector, it can be tested at the production site Perfect for low mass detector Self supporting 100% compatible with mass production tools available in industry Cylindrical detectors BULK advantages: BULK disadvantages: Production in a clean room is mandatory to avoid dust trapping Needs temporary frames during production Limited to 0.6m width in industry (1m at CERN) STD advantages: Extra Large possible sizes (2.4m x 1m) Can be re-opened and re-cleaned Low cost for large detectors 100% compatible with mass production tools available in industry STD disadvantages: Needs stiff and flat panels to handle read-out board and drift board Planarity below 150um is mandatory (but was easily reached in all prototypes) Paradoxically difficult to build in small size 10

Semi automatic machine Printing area 1.5m x 0.9m Screen printed resistive layer : 50um Kapton + resistive strips 50um Kapton 11

Stretching and gluing of the mesh 12

ATLAS NSW project Quantity 1728 modules including 192 spares Around 1200 m2 Size 1/3  2.3m x 0.5m 2/3  2m x 0.5m Timescale 1year Targeted Companies for mass production PCB producer Screen print frame producer Screen printing company (technical or graphic art ) 13

ATLAS NSW project construction step by step 14

PCB + readout strips 50um Kapton + resistive strips 15

PCB + readout strips 50um Kapton + resistive strips 25um solid Glue 16

PCB + readout strips 50um Kapton + resistive strips 25um solid Glue High temp Gluing 17

PCB + readout strips 50um Kapton + resistive strips 25um solid Glue High temp Gluing Pillars creation 18

PCB + readout strips 50um Kapton + resistive strips 25um solid Glue High temp Gluing Pillars creation mesh 19

2m x 1m detector Read-out board with pillars in 4 parts 10 mm thick honeycomb panel on both sides ATLAS R&D real detector Drift panel Read-out panel 20

21

Industry status 3 PCB companies have been chosen for technology transfer (France/Italy/US) The technology transfer have started 2 years ago 3 coordinators are following the 3 companies Companies' technician trainings have been organized at CERN For sizes up to 50cm x 50cm they are now able to provide all the parts nearly as STD parts Large single side read-out boards and drift board up to 2.2 x 0.5m  OK Screen printing of resistive layer up to 2.2m x 0.5m  OK Pillars on large area  OK Large size gluing (2.5m x 0.5m) in progress Vacuum press Autoclave Mesh on frame (100% std) Swiss producer Stretching 2m x 1m mesh  OK Max possible size: 3.4m x 2.2m 22

Test already performed Accuracy of copper strips on the PCB Better than 50um over 2 meters for the 3 suppliers Accuracy of drilling and milling Better than 30um Resistive layer to metallic layer max misalignment No influence up to 2 degrees misalignment Materials: STD FR4 High TG or equivalent (many suppliers up to 2.2m x 0.6m but only one for 2.4m x 0.6m) Kapton H foils or equivalent  OK Screen printed resistors or DLC vacuum deposition  OK Photoimageable coverlay from Dupont ( we are looking for a second supplier)  but OK Stainless steel mesh  OK Long term stability Strong Irradiation test to verify the full life of the detector  OK Beam test All the classical test have been performed during short beam test sessions Some small detector are already running in ATLAS since few years A set of larger detectors (1m x 0.5m) will be installed soon in ATLAS for real conditions tests 23

Other possible project with similar technology Geoscience Muon tomography Homeland security Muon tomography Calorimeters LHC upgrades ILC Muon spectrometers for HEP LHC upgrades TPC LHC upgrade ILC 24

Price for 50cm x 50cm detector! List of all the parts or processes needed to create one detector 2 Stiffening honey comb panels 1 Read-out board (1D read-out) 1 Drift board 1 Kapton foil with resistive strips Gluing the resistive layer Pillars made by photolithography 1 Stainless steel Mesh Mesh gluing 1 Drift spacer frame Screws /o-ring /gas inlet /HV plug Assembly For 1 detector 50cm x 50cm the price is in the range of 5000 CHF For 1000 x 50cm x 50cm detectors we are today below 250 CHF /detector These prices are based on offers received from European companies 25

Thank you Questions? 26