Download - Rui De Oliveira Vienna March 2014
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Rui De Oliveira
Vienna March 2014
Industrialisation of Micromegas detector for ATLAS Muon spectrometer upgrade
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• Principle of the detector
• Structure of the detector : BULK or STD
• Production techniques
• Technology transfer to industry status
• Other similar projects
• Prices
OUTLINE
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Principle
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Resistive Bulk Micromegas real cross section
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Read-out board with Cu strips and resistive strips
Laminated Photoimageable coverlay
Frame
SS Stretched meshon metal frame
Laminated Photoimageable coverlay
Exposure Development+ cure
BULK Micromegas production steps
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BULK Micromegas examples
Largest size produced:1.5m x 0.6mLimited by equipment
BULK TechnologyDUPONT PC 1025 coverlayBOPP Meshes
T2K ILC DHCAL
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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
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STD Micromegas structure
Mechanical support
Mechanical support
Drift electrode
Pillars (128 µm)
Open
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Closed
Mechanical support
Mechanical support
STD Micromegas structure
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• 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
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Semi automatic machinePrinting area 1.5m x 0.9m
Screen printed resistive layer :
50um Kapton + resistive strips50um Kapton
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Stretching and gluing of the mesh
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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)
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ATLAS NSW project construction step by step
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PCB + readout strips
50um Kapton + resistive strips
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PCB + readout strips
50um Kapton + resistive strips
25um solid Glue
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PCB + readout strips
50um Kapton + resistive strips
25um solid Glue
High temp Gluing
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PCB + readout strips
50um Kapton + resistive strips
25um solid Glue
High temp Gluing
Pillars creation
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PCB + readout strips
50um Kapton + resistive strips
25um solid Glue
High temp Gluing
Pillars creation
mesh
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• 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
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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
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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 equivalentOK• 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
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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
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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
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Thank youQuestions?