Construction and Quality Assurance of Large Area Resistive Strip - - PowerPoint PPT Presentation

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Construction and Quality Assurance of Large Area Resistive Strip - - PowerPoint PPT Presentation

Feb 23, 2023 215 likes •712 views

Construction and Quality Assurance of Large Area Resistive Strip Micromegas for the Upgrade of the ATLAS Muon Spectrometer Philipp L osel on behalf of the ATLAS Muon Collaboration LS Schaile Ludwig-Maximilians-Universit at M unchen

slide-1
SLIDE 1

Construction and Quality Assurance of Large Area Resistive Strip Micromegas for the Upgrade of the ATLAS Muon Spectrometer

Philipp L¨

  • sel
  • n behalf of the ATLAS Muon Collaboration

LS Schaile Ludwig-Maximilians-Universit¨ at M¨ unchen

Instrumentation for Colliding Beam Physics Novosibirsk 2017 02.03.2017

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 1 / 26

slide-2
SLIDE 2

Outline

1

Motivation for the ATLAS NSW Upgrade Project

2

Construction of NSW Micromegas Quadruplets Design of the Micromegas Quadruplets Requirements for Micromegas Detectors Panel Construction Alignment of the Readout Boards

3

Quality Assurance of NSW Micromegas Quadruplets Planarity Measurement of the Panels Verification of Strip Alignment High Rate Irradiation Tests

4

Summary

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 2 / 26

slide-3
SLIDE 3

High Luminosity Upgrade of LHC

LHC high luminosity upgrade

2021: Run 3: 2 × Ldesign 2026: Run 4: 5 − 7 × Ldesign

upgrade of inner end-cap region of Muon Spectrometer (Small Wheels) before Run 3

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 3 / 26

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SLIDE 4

Motivation for the ATLAS NSW Upgrade Project

full inclusion of New Small Wheel in trigger 90 % of trigger are fake in end-cap region A track pointing to IP (good muon track) B no hit in Small Wheel (fake) C background event: not pointing to IP (fake) MDT efficiency loss: L > Ldesign = ⇒ ε < 90 % L > 2 Ldesign = ⇒ ε < 60 % maintain current excellent momentum resolution for higher luminosity: ∆pT ≈ 15 % @ pT = 1 TeV muons

= ⇒ New Small Wheel needs trigger and high rate capable new technology:

sTGC and Micromegas

1 mrad resolution + trigger capability needed

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 4 / 26

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SLIDE 5

Outline

1

Motivation for the ATLAS NSW Upgrade Project

2

Construction of NSW Micromegas Quadruplets Design of the Micromegas Quadruplets Requirements for Micromegas Detectors Panel Construction Alignment of the Readout Boards

3

Quality Assurance of NSW Micromegas Quadruplets Planarity Measurement of the Panels Verification of Strip Alignment High Rate Irradiation Tests

4

Summary

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 5 / 26

slide-6
SLIDE 6

Layout of the New Small Wheel

disk-like design:

eight large sectors eight small sectors

sector: two Micromegas wedges sandwiched by two sTGC wedges = ⇒ eight layers of sTGCs (trigger) eight layers of Micromegas (tracker) Micromegas wedges subdivided in two Micromegas quadruplets

2 x 4 active layers MM Chambers sTGC sTGC sector wedges

Micromegas quadruplet strip layout

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 6 / 26

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SLIDE 7

Design of the Micromegas Quadruplets

2-3 m2 Micromegas Micromegas quadruplets:

three drift panels two readout panels four meshes mounted on drift panels four gas volumes between panels are the active Micromegas layers

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 7 / 26

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SLIDE 8

Resistive Strip Micromegas

0.128 mm 5 mm cathode resistive strips pillar mesh 300 V 570 V 0 V readout strips µ µ

resistive strip Micromegas detector

anode drift amplification ionization drift

tdrift

cluster

single active plane of a quadruplet:

cathode grounded micro-mesh anode strip structure

position reconstruction:

charge centroid over strip-cluster track reconstruction via tdrift = f (strip) pillars strips drift cathode mesh stiffening panel stiffening panel Al frame PCB stiffening panel stiffening panel

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 8 / 26

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SLIDE 9

Production of Resistive Strip Readout Boards

PCB with copper readout strips Kapton foil with resistive pattern aligned to readout strips with markers Kapton foil glued on top of readout strips silver connection between HV connector and resistive pattern 128 µm coverlay pillars as mesh support

resistive pattern Kapton foil readout strips PCB Polymer silver conduct HV connection coverlay pillar Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 9 / 26

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SLIDE 10

Requirements for Micromegas

maintain current excellent momentum resolution for higher luminosity: ∆pT ≈ 15 % @ pT = 1 TeV muons = ⇒ 100 µm spatial resolution in a single plane 30 µm alignment accuracy of readout strips on the individual PCBs and particularly the alignment within a quadruplet 80 µm accuracy perpendicular to the plane

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 10 / 26

slide-11
SLIDE 11

Panel Construction in two Gluing Steps: Step 1

vacuum granite table PCBs

PCBs placed and aligned on granite table

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 11 / 26

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SLIDE 12

Panel Construction in two Gluing Steps: Step 1

vacuum granite table glue sealing tape

PCBs placed and aligned on granite table sucked to granite table and sealed with tape = ⇒ planarity transfer glue distributed on PCBs

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 11 / 26

slide-13
SLIDE 13

Panel Construction in two Gluing Steps: Step 1

vacuum granite table honeycomb aluminum bars halfpanel

PCBs placed and aligned on granite table sucked to granite table and sealed with tape = ⇒ planarity transfer glue distributed on PCBs aluminum bars and honeycomb placed on top halfpanel cures over night in vacuum bag

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 11 / 26

slide-14
SLIDE 14

Panel Construction in two Gluing Steps: Step 2

vacuum granite table vacuum stiffback perforated honeycomb precision distance pieces halfpanel honeycomb alu alu

PCBs placed and aligned on granite table sucked to granite table and sealed with tape = ⇒ planarity transfer glue distributed on PCBs aluminum bars and honeycomb placed on top halfpanel cures over night in vacuum bag halfpanel removed and sucked to stiffback second set of PCBs placed on granite table glue distributed on PCBs

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 11 / 26

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SLIDE 15

Panel Construction in two Gluing Steps: Step 2

vacuum granite table vacuum stiffback perforated honeycomb

PCBs placed and aligned on granite table sucked to granite table and sealed with tape = ⇒ planarity transfer glue distributed on PCBs aluminum bars and honeycomb placed on top halfpanel cures over night in vacuum bag halfpanel removed and sucked to stiffback second set of PCBs placed on granite table glue distributed on PCBs stiffback with halfpanel placed on distance pieces = ⇒ well defined panel thickness

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 11 / 26

slide-16
SLIDE 16

Panel Construction in one Gluing Step

main difference: no halfpanel, only PCBs sucked to stiffback

vacuum granite table vacuum stiffback perforated honeycomb precision distance pieces honeycomb alu alu vacuum granite table vacuum stiffback perforated honeycomb

all

  • ther

steps as before

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 12 / 26

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SLIDE 17

Panel Construction in one Gluing Step

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 13 / 26

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SLIDE 18

Alignment of the Readout Boards

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 14 / 26

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SLIDE 19

Two Versions of Alignment: Precision Holes or Washers

planar precision plates well aligned pins + precision holes precision washer glued @ position

  • f target

accurate alignment frame global alignment on granite table relative alignment using pins

washer gluing

accuracy < 5 μm

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 15 / 26

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SLIDE 20

Two Versions of Alignment: Precision Holes or Washers

planar precision plates well aligned pins + precision holes precision washer glued @ position

  • f target

accurate alignment frame global alignment on granite table relative alignment using pins

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 15 / 26

slide-21
SLIDE 21

Two Versions of Alignment: Precision Holes or Washers

planar precision plates well aligned pins + precision holes precision washer glued @ position

  • f target

accurate alignment frame global alignment on granite table relative alignment using pins

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 15 / 26

slide-22
SLIDE 22

Mesh Stretching and Mounting

mesh stretching:

in cleanroom pneumatic clamps

  • 1. step: glued on transfer frame
  • 2. step: glued onto mesh frame

tension ≈ 11 N/cm

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 16 / 26

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SLIDE 23

Mesh Stretching and Mounting

8 9 10 11 12 13 14

11.8 11.6 11.4 11.6 11.6 11.2 11.2 11 11.6 11.6 11.4 11.6 11.6 11.6 11.8 11.8 11 11.2 10.8 11.2 11.2 11.2 11.6 11.6 11.8 11.8 11.8 11.8 12 12 12 12 12.2 12 11.6 12 12.4 12.4 12.6 12.2 11.6 11.8 11.6 11.8 11.8 11.6 11.6 11

x [mm] 200 400 600 800 1000 1200 1400 1600 1800 2000 y [mm] 200 400 600 800 1000 1200 1400

Average mesh tension: 11.66 +- 0.38 N/cm (RMS)

mesh stretching:

in cleanroom pneumatic clamps

  • 1. step: glued on transfer frame
  • 2. step: glued onto mesh frame

tension ≈ 11 N/cm

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 16 / 26

slide-24
SLIDE 24

Stabilization of the Quadruplet Against Overpressure

deformation of drift region for outer detector layers due to 2 mbar overpressure in gas volumes = ⇒ 4-7 interconnections integrated in Micromegas quadruplets example: LM1 ANSYS FEM simulation

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 17 / 26

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SLIDE 25

Precision Assembly using Dedicated Pins

pins and bushes precisely glued into the panel using precision templates = ⇒ perfect alignment of both readout panels

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 18 / 26

slide-26
SLIDE 26

Fully Assembled Micromegas Quadruplet

pressure sensors and micrometer adjustment units = ⇒ assembly free of forces = ⇒ free movement of pins in bushes

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 19 / 26

slide-27
SLIDE 27

Outline

1

Motivation for the ATLAS NSW Upgrade Project

2

Construction of NSW Micromegas Quadruplets Design of the Micromegas Quadruplets Requirements for Micromegas Detectors Panel Construction Alignment of the Readout Boards

3

Quality Assurance of NSW Micromegas Quadruplets Planarity Measurement of the Panels Verification of Strip Alignment High Rate Irradiation Tests

4

Summary

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 20 / 26

slide-28
SLIDE 28

Planarity Measurement of the First SM2 Readout Panel

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 21 / 26

slide-29
SLIDE 29

Verification of Strip Alignment using Coded Masks

contact CCDs 5 × 8 coded masks on each readout plane contact CCDs mounted on reference jig position and rotation of coded masks can be calculated = ⇒ verification of strip alignment

  • Accuracy: О(μm)

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 22 / 26

slide-30
SLIDE 30

Verification of Alignment of the two Surfaces of a Panel

measure coded masks (Rasmasks) on two opposite sides of the panel no contact between tool and panel reconstruct positions with respect to each other can also be used on whole quadruplet

  • r with global reference masks

calibration with one transparent mask

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 23 / 26

slide-31
SLIDE 31

Calibration using Cosmic Muons, Alternative: X-Rays

2 external tracking references (2 MDTs) study of principle: 1 m2 prototype detector with two readout boards no alignment tool used for gluing of anode structure muon tracks show: variation of gap size between PCB plates during gluing shift: 100 µmm rotation: 350 µm/m NSW-MM: elimination of this effect by precise tooling

x [ 1 m m ] 1 2 3 4 5 6 7 8 9 10 y [ 5 7 . 6 m m ] 2 4 6 8 10 12 14 16 y [mm] ∆

  • 0.6
  • 0.5
  • 0.4
  • 0.3
  • 0.2
  • 0.1

0.1

  • 0.6
  • 0.5
  • 0.4
  • 0.3
  • 0.2
  • 0.1

precision direction

0.1 mm 0.45 mm

ROB 1 ROB 2

strips precision direction

1 m 1 m

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 24 / 26

slide-32
SLIDE 32

High Rate Behavior: GIF++

Gamma Irradiation Facility (GIF++) at CERN 14 TBq 137Cs source 662 keV gamma flux ≈ 6 × 107 Hz/cm2 high rate irradiation tests of all modules

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 25 / 26

slide-33
SLIDE 33

Summary

construction of Micromegas quadruplets for the ATLAS NSW Upgrade:

mechanical requirement can be fulfilled precise alignment of readout boards using precision templates planarity transfer from granite table using vacuum technique interconnections to prevent chamber deformations

quality assurance of NSW Micromegas quadruplets:

planarity measurements using laser triangulation heads verification of strip and surface alignment using coded masks calibration with cosmic muons or X-Rays high rate irradiation test in GIF++

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 26 / 26

slide-34
SLIDE 34

Summary

construction of Micromegas quadruplets for the ATLAS NSW Upgrade:

mechanical requirement can be fulfilled precise alignment of readout boards using precision templates planarity transfer from granite table using vacuum technique interconnections to prevent chamber deformations

quality assurance of NSW Micromegas quadruplets:

planarity measurements using laser triangulation heads verification of strip and surface alignment using coded masks calibration with cosmic muons or X-Rays high rate irradiation test in GIF++ high energy testbeam campaigns @ CERN to check spatial resolution, efficiency, etc.

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 26 / 26

slide-35
SLIDE 35

Summary

construction of Micromegas quadruplets for the ATLAS NSW Upgrade:

mechanical requirement can be fulfilled precise alignment of readout boards using precision templates planarity transfer from granite table using vacuum technique interconnections to prevent chamber deformations

quality assurance of NSW Micromegas quadruplets:

planarity measurements using laser triangulation heads verification of strip and surface alignment using coded masks calibration with cosmic muons or X-Rays high rate irradiation test in GIF++ high energy testbeam campaigns @ CERN to check spatial resolution, efficiency, etc.

THANK YOU

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 26 / 26

slide-36
SLIDE 36

Backup

Backup

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 27 / 26

slide-37
SLIDE 37

Alignment of Resistive Pattern to Readout Strips

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 28 / 26

slide-38
SLIDE 38

Precision Washer glued on PCBs

very precise alignment frame mounted on granite table 2 external pin for global alignment 6 pins for relative PCB alignment washer gluing with telecentric camera

global alignment

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 29 / 26

slide-39
SLIDE 39

Alternative Method: SM2/LM1

precision holes drilled in PCB

5 precision plates well aligned pins + precision holes

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 30 / 26

slide-40
SLIDE 40

C-CCD

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 31 / 26

slide-41
SLIDE 41

Rasnik Analysis I

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 32 / 26

slide-42
SLIDE 42

Rasnik Analysis II

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 33 / 26

slide-43
SLIDE 43

Alignment with Compact CCD

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 34 / 26

slide-44
SLIDE 44

Cosmic Ray Facility, LMU Munich

Micromegas under test

MDT reference chamber MDT reference chamber

trigger scintillators trigger scintillators

x y z

iron absorber

two Monitored Drift Tube (MDT) reference chambers = ⇒ two reference tracks two trigger scintillator hodoscopes = ⇒ second coordinate = ⇒ segmentation of test Micromegas in 10 cm wide segments 34 cm iron absorber = ⇒ Eµ > 600 MeV active area 9 m2, Θ ∈ [−30◦, 30◦]

= ⇒ investigation of the whole active area of 2-3 m2 large Micromegas

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 35 / 26

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SLIDE 45

1 m2 Micromegas Chamber (L1)

connector 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

readout area gas in gas out z y x

APV7 S APV6 M APV4 M APV8 M APV10 M APV5 S APV9 S APV11 S

102cm 92cm

readout side

  • pen strip side

readout electronics

APV3 S APV2 M APV1 S APV0 M APV12 M APV13 S APV14 M APV15 S

active area

16 APV 10 scintillator segments

scintillator

1 2 3 4 5 6 7 8 9

5.9"

resistive strip technology active area: 0.92 × 1.02 m2 two readout boards with in total 2048 strips pitch: 0.45 mm Ar:CO2 93:7 vol% @ atmospheric pressure 16 APV25 front-end boards 57.6 mm wide (y - coordinate) 10 scintillator segments 100 mm wide (x - coordinate) = ⇒ subdivision of detector in 16 APV × 10 scintillators = 160 partitions

= ⇒ calibration and alignment for each of the 160 partitions

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 36 / 26

slide-46
SLIDE 46

Alignment - Using Reference Tracks (160 partitions)

measurement of y position (perpendicular tracks): residual via centroid method: res = ymeasured − ypredicted ∆y = res measurement of z position (inclined tracks): ∆z =

res tan α

res = my · ∆z with my = tan α fit with a straight line ⇒ ∆z = slope ∆y = intercept measurement of y position

muon track strips actual detector position assumed detector position Δy

measurement of z position

muon track strips actual detector position assumed detector position Δz Δy α

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 37 / 26

slide-47
SLIDE 47

Verification of Strip Alignment: X-Rays

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 38 / 26

slide-48
SLIDE 48

Plane to Plane Alignment – Mechanical Measurement

readout panel alignment before assembly verification on both sides with laser tracker

Philipp L¨

  • sel (LMU)

Construction and QA of NSW Micromegas 02.03.2017 39 / 26