Detector R&D at NIKHEFSAC meeting, 20 April 2007

Jan Timmermans

• Pixel readout of gas detectors: Gridpix, Timepix, …

• Medipix, RELAXd• 100 m RASNIK alignment

Micro Patterned Gaseous Detectors

GEM

Micromegas

• High field created by Gas Gain Grids

• Most popular: GEM & Micromegas

Use ‘naked’ CMOS pixel readout chip as anode

Results pixel readout gas detectors

Observation of min. ionising cosmic muons: high spatial resolution + individual cluster counting !

δ ray

NIKHEF-Saclay-CERN-Twente

NIM A540 (2005) 295 (physics/0409048)

55x55 μm2 pixels

TimePix(EUDET: Bonn,Freiburg, Saclay, CERN, NIKHEF)

•Distribute clock to full 256x256 pixel matrix (50-100-160MHz)

•Enable counting by first hit after ‘shutter’ opens, until ‘shutter’ closes (common stop); also time-over-threshold possible

•Dynamic range 214 x 10 ns = 160 μs

•(for the time being) no zero-suppress

to remain fully compatible with Medipix2

•Shaping time ~200 ns

•Keep same chip-size, pixel-size, readout protocol

•1st full reticle submit done July 2006; IT WORKS!

11 22 44

55

66

55μm

55μm

First tracks with TimePix+SiProt+Micromegas:

cosmics + α particle

V_grid= -400 V; gain ~5000

He/Isobutane 80/20

Acquisition (‘shutter’) time ~ 1sec

Time_over_threshold mode pulseheight

And triggered cosmics (sum of several triggers)

Shutter time = 15 μs

TimePix chip stayed alive for 40 days with He/isobutane 80/20

And ‘died’ on 26/1/07 after 1.5 day with Ar/isobutane 80/20

Blue = late

Red = early

First INGRID tests

• Post-processing of a 4” wafer successful!– SiProt covered– InGrid– Diced to individual chips

• Handling critical• SU8 photo-resist dike

around the pixel matrix

• Perfect alignment pads/holes

• Pillars in between pads

• 2 chips tested in He 20% iC4H10

• 55Fe signals at Vgrid = -280 V i.e. G ~ 200• Almost full homogeneous response• Still short lifetime (sparks even at low gains)

Micromegas covered Timepix

InGrid covered Medipix

Moire effects with Micromegas

TwinGridAlternative:

Fred Hartjes 10

NIKHEF detector R&D meeting. January 23, 2007

MIP response for Gossip 21

charge signal (ke-)

0 10 20 30 40 50

# of

eve

nts

0

100

200

300

400

500

Measured histogramFitted convoluted PoissonAssumed pedestal peak

Vmesh = - 600 V

Vcath = -1000 V

Drift gap 1.2 mm=> Edrift = 3.3 kV/cm

pad pattern on glassBrass Micromegasgas: Kr/DME 74/26Exitation by mips from 90Sr source2.55% pedestal events14-2-2007

GOSSIP: 1.2 mm thin gas detector + Micromegas Gas: Kr/DME 74/26

Measured histogram with fitted convoluted Poisson

Cluster density calculated from two independent methods

1. Magnitude pedestal peak 2.55 +/- 0.07 % pedestal events

=> cluster density 39.1+/-0.8 cm-1

2. Fitting convoluted Poisson to experimental data

Using pdf =1 the best fit occurs at 38.2 +/- 2.6 cm-1 ¥

¥Note that this number depends on the pdf value

LiteratureCluster density Kr/DME 74/26: 40.2 cm-1

GOSSIPO-2 chip:

• CMOS 130nm technology

• Multi-project wafer run (design ready Nov. 2006)

•16 x 16 pixels

•Each pixel: preamp, shaper, discriminator + 700 MHz clock (active for short interpolating period)

Waiting for the run to take place

Medipix and RELAXd

18 April 2007 - Jan Visschers

Medipix Collaboration

- Univ + INFN CagliariUniv + INFN Cagliari

- CEA-LIST SaclayCEA-LIST Saclay

- CERN Genève- CERN Genève- Univ d'Auvergne Univ d'Auvergne

- Univ Erlangen- Univ Erlangen

- ESRF Grenoble- ESRF Grenoble

- Univ Freiburg- Univ Freiburg

- Univ Glasgow- Univ Glasgow

- IFAE Barcelona- IFAE Barcelona

- Mitthoegskolan - Mitthoegskolan

Sundsvall Sundsvall

- MRC-LMB Cambridge - MRC-LMB Cambridge

- Univ + INFN Napoli- Univ + INFN Napoli

- - NIKHEF AmsterdamNIKHEF Amsterdam

- Univ + INFN Pisa- Univ + INFN Pisa

- FZU CAS Prague - FZU CAS Prague - IEAP CTU Prague IEAP CTU Prague - SSL Berkeley SSL Berkeley

Spokespersons: Spokespersons: Michael CAMPBELL CERNMichael CAMPBELL CERNJan VISSCHERS NIKHEFJan VISSCHERS NIKHEF

Quad Medipix

1sensor on 4 Medipix chips6-layer ultra-fine line designLaser-drilled micro-via’sKapton Buildup technology0.25 Megapixels

RELAXd: Tile-able Microsystems

1. Edgeless Planar Silicon Sensors

2. Through-CMOS contacting

3. High-bandwidth readout

Medipix 2.1 ROIC

1. Canberra

2. IMEC

3. NIKHEF4. PANalytical (application)

Eureka Project

Raw image of 90Sr source with current Quad carrier.

Medipix ASIC

Through-CMOS connections

Multi-layered chip carrier board

Medipix ASIC

Quad sensor

• Through-silicon interconnect• Medipix wafer thinning: 100 um• Ball-Grid Array on the back side of the Medipix chip• Balls 500 um diameter, 800 um pitch

Frame and Cooling

Large area (9x9 cm2)< 100 Watts total powerCeramics FrameCooling pipes through framePower through frame

Roadmap

Through-via carrierZdenek Vykydal

Multi-Gbps carrierBas van der Heijden

RELAXD module(end 2007)John Hug

Current Quad

Frame, Power,Cooling (2009)

100m RASNIK alignment

Harry van der Graaf

Coded Mask

Light Source LensCCD

8000 systems installed in ATLAS

Principle of CCD-RASNIK(as used for muon chamber alignment in L3)

100 m RASNIK for CLICCLIC

Accelerator length: 2 x 15 kmNumber of elements: 15.000Number of ‘4 m’ RASNIKs: 15.000/30.000Number of ‘100 m’ RASNIKs: 600

Laser zone lenshole dia. 50 mm

RasCam

100 m (vacuum tube!)

Image position on sensor. Response of earthquake in Mid-Atlantic,5 Richter Scale, on March 1, 2007

Tidal movement: crust deformation due to angular positionof Sun and Moon, measured with RasClic, CERN, Geneva (filtered raw data)

The ‘Earth Hum’, measured after the ‘tsunami’ earthquake, Xmas 2004[Park et al]

(Direct) Fourier coverted raw X-data of RasClic, Feb 2007New wide-band seismometer?

‘Hum’ modes