Andrey MarinovOn behalf of

GEM Collaboration GEMs for CMS

No-stretch assembly of triple GEMs

2L. Franconi - A. Marinov - M. Zientek

Technologies used for all the CMS prototypesNS1 Prototype – 10x10cmNS2 Prototype – 30x30cmFuture Plans

Talk Outline

RD51 Miniweek - Nov. 2011

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Thermo stretching methodAll CMS prototype s where build based on this

method

Assembly technologies used in CMS prototypes

RD51 Miniweek - Nov. 2011

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“Honeycomb” GEM

Insert honeycomb spacers between GEM foils to avoid foil stretching

Similar performance level observed as for standard GEMs, but local efficiency losses due to spacers.

RD51 Miniweek - Nov. 2011L. Franconi - A. Marinov - M. Zientek

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NS1 10x10cm

RD51 Miniweek - Nov. 2011

Holes for the Stretching pins

Protection resistors 10MohmsContact areas

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10x10 [NS2] prototype: New mechanics

GEM foil with the protection resistors

Read-Out board, bottom plane

Read-Out board, top plane, connector

Frame for stretching

Placing the foil Mounting the frame and stretching

Stretched GEM foil Placing the Read-Out

Assembled in 1 hour!

RD51 Miniweek - Nov. 2011

GEM foil tests in CO2 have been done by applying HV to each GEM and measuring the current.

Nothing suspicious has been found.

The drift was also tested up to 3.5kV, measured current was constant 0.3nA.

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NS1 – 10x10cm

Small prototype in the setup, connected to the gas.

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NS2 30x30cm

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GEM foil

Holes for the stretching

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Drift plane

Pins for the HV connections

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NS2 30x30cm

RD51 Miniweek - Nov. 2011

Drift electrodeand the external frame

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NS2 30x30cm

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Triple GEM frameReady for stretching

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NS2 30x30cm

Stretching the GEMs

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NS2 30x30cm

RD51 Miniweek - Nov. 2011

Stretched GEMs

Waiting the readoutPCB to be mounted

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It is under testGain calibrationGain stabilityUniformity

NS2 30x30cm Status

RD51 Miniweek - Nov. 2011

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After validating NS2 we would like to go for NS3 with full GE1/1 size.

We need to see the possibility the build such a detectorMechanicsHVReadoutGas….

Future Plan

RD51 Miniweek - Nov. 2011

19L. Franconi - A. Marinov - M. Zientek

Thanks toLeszek Ropelewski

Rui De OliveiraThe RD51 Team

Thank you

11/21/2011