Status report NIKHEF

NIKHEF Auke-Pieter ColijnAlessandro FornainiHarry van der GraafPeter KluitJan TimmermansJan Visschers

Saclay CEA DAPNIA Maximilien Chefdeville Paul ColasYannis GiomatarisArnaud Giganon

Univ. Twente/Mesa+ Jurriaan Schmitz

CERN/Medipix Constm Eric HeijneXavie LlopartMichael Campbell Thanks to:

Wim GotinkJoop Rovenkamp

TPC R&D phone/VRVS meeting 21/7/2004

PhD student per 1/9/04

Detection of single electrons using MediPix2/Micromegas Detection of single electrons using MediPix2/Micromegas assembly as Direct Pixel Segmented Anodeassembly as Direct Pixel Segmented Anode

Analysis of cosmic data 31/3-2/4Analysis of cosmic data 31/3-2/4

Final draft of NIM paper ready Final draft of NIM paper ready http://www.nikhef.nl/~d90/tesla/letter3.pshttp://www.nikhef.nl/~d90/tesla/letter3.ps http://www.nikhef.nl/~d90/tesla/letter3.pdfhttp://www.nikhef.nl/~d90/tesla/letter3.pdf

#pixels hit/mm track length = 1.83#pixels hit/mm track length = 1.83

#clusters/mm track length = 0.52#clusters/mm track length = 0.52

Single electron efficiency 0.9Single electron efficiency 0.9

Moire effects: mismatch in pixel and hole Moire effects: mismatch in pixel and hole pitch: 60/(60-55) = 12 pixels repetitionpitch: 60/(60-55) = 12 pixels repetition

He/Isobutane80/20Modified MediPix

Sensitive area:14 x 14 x 15 mm3

Drift direction:Verticalmax = 15 mm

He/Isobutane80/20Modified MediPix

δ-ray?

Non Modified Modified

Peter Kluit: cluster & electron density versus MC of MIP cosmic rays:single electron efficiency > 0.90AND:Good explanation for Moire effect: pitch Micromegas holes: 60 μm

pitch MediPix pixels: 55 μmPeriodic position of hole w.r.t. pixel: repeats after 12 pixels!

Modified

Non Modified

InGrid: perfect alignment of pixels and grid holes!Small pad: small capacitance!

Integrate GEM/Micromegas and pixel sensor

‘GEM’ ‘Micromegas’

By ‘wafer post processing’

InGrid

First InGrid expected in 2-3 weeks

Wafer dia.: 100 mm30 fields with variety of pillar geometry

INGRID: some first trials

Various pitches, shapes

1. WSLC-Paris 2004: LC ready in 2015…, not known where…..2. People with power and $: what is the relevance for LHC?!

So:

Other applications of TimePixGrid:

- μ-TPC- upgrades of TPCs: STAR, ALICE- Transition Radiation Detectors- GOSSIP: tracker for intense radiation environment

CMOS pixel array

MIP

Micromegas

GOSSIP: Gas On Slimmed SIlicon Pixels

Drift gap: 1 mmMax drift time: 10 ns

MIP

CMOS pixel chip

Cathode foil

Essentials of GOSSIP:

• Generate charge signal in gas instead of Si (e-/ions versus e-/holes)•Amplify # electrons in gas (electron avalanche versus FET preamps)

Then:• No radiation damage in depletion layer or pixel preamp FETs• No power dissipation of preamp FETs

GOSSIP: 1 mm gas layer + 20 μm gain gap + CMOS (digital!) chipAfter all: it is a TPC with 1 mm drift length (parallax!)

Max. drift length: 1 mmMax. drift time: 10 nsResolution: 0.1 mm 1 ns

EfficiencyPosition resolutionRate effectsAgeingRadiation hardnessHV breakdownsPower dissipationMaterial budget

More details in http://www.nikhef.nl/~d90/tesla/NIPHAD_GOSSIP.ppt

Conference presentations:

LCWS Paris, April (Jan T.)

IPRD Siena, May (Harry v/d G.)

IWORID Glasgow, July (Alessandro F.)

VERTEX Como, September (Harry v/d G.)

IEEE Rome, October ( Harry v/d G. ?)

Coming activities:

•Cosmic trigger setup ready in few weeks

•New Micromegas available very soon (PaulC.?)

•New Medipix2 available

•First Ingrid1 tests

•Simulations

Longer term:

•Ingrid2 together with MediPix

•Development of Timepix1 (for TPC) and Timepix2 (for GOSSIP) CMOS chips