Joerg Wotschack (CERN) 1

ATLAS micromegas activities(MAMMA)

Status report

RD51 mini week, 14/06/2012

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The status of the ATLAS New Small Wheel project

Beginning of May the ATLAS Muon IB endorsed the baseline for the instrumentation of the New Small Wheel as proposed by the muon management, it consists of 2 x 4 layers of sTGC detectors, mainly for triggering (but also tracking) 2 x 4 layers of Micromegas, mainly for precision measurement (but also

triggering) The decision was taken subject to a number of milestones to be fulfilled

by both technologies by the end of 2012; the main ones for the MMs are Show that 2 x 1 m2 micromegas can be built with the required precision Demonstrate that a resolution of <100 µm can be achieved for inclined tracks Performance in magnetic field (see talk by G. Iakovidis in WG2) Ageing under sparking (see talk by J. Galan in WG2)

Since then a number of new institutes have joined MAMMA

RD51 mini week, 14/06/2012 Joerg Wotschack (CERN)

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2.4 m

ATLAS Small Wheel upgrade

RD51 mini week, 14/06/2012 Joerg Wotschack (CERN)

Baseline solutionEquip the Small Wheels with sTGC & micromegas chambers sTGC as trigger chambers MM for precision and 2nd coord.

Measurement, as well as trigger Each MM comprises eight active

layers, arranged in two multilayers, separated by 10 cm

Each layer with two coordinates with 0.5 and 1.5 mm strip pitch (or stereo)

2M readout channels a total of about 1200 m2 of

detection layers

Present Small Wheel

Joerg Wotschack (CERN) 4

New Small Wheel Layout (under study)

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The ATLAS New Small Wheel project The next steps (ATLAS procedures)

Initial design review (29 and 30 August) Institute Kick off meeting (31 of August) EB approval (14 September) CB approval (5 October) TDR & presentation to RBB in spring 2013

Chamber production Working group has been set up in ATLAS to agree on a layout Setting up a structure in MAMMA to follow production issues Industrialization has started with a number of companies in Europe in

the context (and with the help) of RD51, but also in the USA and Japan Module 0 construction in 2013/14 Chamber production (1200 m2 of MMs) in 2015/16

RD51 mini week, 14/06/2012 Joerg Wotschack (CERN)

Joerg Wotschack (CERN) 6

Other ongoing activities MMs installed in ATLAS detector (Feb. 2012)

Four 10 x 10 cm2 MMs on ATLAS Small Wheel One 9 x 4.5 cm2 chamber with two readout gaps (and two

coordinates per gap) in front of EM calorimeter (very high rates ≥ 100 kHz/cm2)

Chambers are equipped with APV25 hybrid cards and read out through the RD51 SRS operated flawlessly, (so far) in stand-alone mode with random

triggers to study background Integration into ATLAS DAQ and into offline analysis chain is

ongoing (see talk by M. Byszewski and A. Zibell in WG5); expected to be operational in summer

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Joerg Wotschack (CERN) 7

ATLAS MBT0 chambers

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Mic

rom

egas

cur

rent

(µA)

MBT0 detector installed on front-face of LAr calorimeter cryostat at 1 m from beam pipeTypical interaction rate: ≈100 kHz/cm2

Joerg Wotschack (CERN) 8

MMs on the Small Wheel

RD51 mini week, 14/06/2012

Stack of 4 micromegas chambers R19 (xuv), R18 (xy), R16 (xy), R13 (x)

Stack of 4 micromegas chambers installed on ATLAS Small Wheel A, sector 9

Joerg Wotschack (CERN) 9

Test beam activities in 2012

H2: 2–11 June Study of performance of MMs in magnetic field, very

successful (see talk by G. Iakovidis in WG2) H6: 25 July – 8 Aug. and 1 – 6 Nov.

Eight 10 x 10 cm2 MMs & new BNL front-end chip (VMM1), see talk by V. Polychronakos in WG5 Demonstration of tracking precision for large angle tracks

(µTPC mode) Demonstration of trigger scheme (1 mrad track angle online)

1 x 1 m2 chamber with floating mesh and long strips

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Joerg Wotschack (CERN) 10

Construction plans for 2012

Production of 1 x 1 m2 MM, made of two PCBs (0.5 x 1.2 m2) on common Al carrier, floating mesh (not bulk); to be evaluated in July test beam

Four planes of 1 x 2 m2 in bulk technology by the end of 2012 with the required precision (THE milestone !!!)

Various mechanical studies of PCB assembly to reach the required precision of 40 µm on strip location and flatness, as well as the relative alignment of several MM layers

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Joerg Wotschack (CERN) 11

Conclusions

Micromegas have been chosen as baseline for the precision measurement detectors (but also trigger) of the New Small Wheel of ATLAS, subject to some milestones

Most important milestone to be reached by end of 2012 is the demonstration that 2 x 1 m2 MMs can be built

Rich test programme, in particular using the new BNL VMM1 chip

Micromegas installed in ATLAS working flawlessly even at rates of 100 kHz/cm2; integration into ATLAS readout expected for this summer

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