DPG 2001Frank Hartmann (IEKP)

P-irradiated-oxygenated Non-irradiated-oxygenatedNon-irradiated-non-oxygenatedP-irradiated-non-oxygenated sensors put in a PSI testbeam

in very short time

A „Cross-Alps“ CMS collaboration of Bari, Karlsruhe, Padova, Perugia and Wien

Silizium-Mikrostreifen-Detektoren

nach 10 Jahren LHC für CMS

Goal:• Test complete CMS like Quality assurance

• Ensure sensor functionality after 10 LHC years

DPG 2001Frank Hartmann (IEKP)

Blue double layers

Red single layers

Low resistivity to postponetype inversion lower Vdep after 10 LHC years

New all-silicon design:10 barrel layers2 inner barrel disk9 forward disks

CMS Tracker Design & Layout (1)

DPG 2001Frank Hartmann (IEKP)

CMS Tracker Design & Layout (2)

Use <100> instead of standard <111> silicon less dangling bonds less surface damage ~no increase of interstrip capacitance after irradiation no increase in noise

For small width over pitch ratio (0.25) implement metal overhang on strip to avoid breakdown (field reaches through SiO2) more stable detector with respect to bias voltage up to 500V

DPG 2001Frank Hartmann (IEKP)

P-Irradiation at Karlsruhe

B eam d iam e te r:

2 - 1 2 m m u s in g a W o p p le r

Ir rad ia te d a re a b y p o s itio n in g :

u p to 4 0 0 * 1 0 0 m m 2

• This time: 34MeV protons. (10 LHC years)

• Sensors cooled down to –10°C during irrad. (CMS like operation)

• Future CMS QA

Karlsruhe KompaktzyklotronP ro to n en e rg ie s :1 7 - 3 5 M e V o r

1 - 1 7 M e V(u s in g a d e g ra d e r- ta rg e t)

P ro to n cu rren t: 1 0 n A - 1 0 0 m A

P ro to n flu x :

1 0 in 7 0 0 s a t 1 0 0 n A1 4 pc m 2

DPG 2001Frank Hartmann (IEKP)

165V

350V

At 21°C

Tests in the lab (1)IV CV

DPG 2001Frank Hartmann (IEKP)

101pF~Same as before

1.7M~Same as before

3.2pF (one neighbour)~Same as before

1 - 2.5nA before at 21°C

Tests in the lab (2)

~450nA

DPG 2001Frank Hartmann (IEKP)

One double-sensor module

1 module with:

2 oxygenated sensors

APV25S1

prototype hybrid

prototype repeater

In the cool-box-frame

DPG 2001Frank Hartmann (IEKP)

Assembly at the PSI

Beam

Bias voltage supply

Cool-box

Electronics

DPG 2001Frank Hartmann (IEKP)

 

 

Detector Sensor Pitch Readout Status

BAI1 2xCSEM 4'', HR(7kcm), Nonirrad 61m APV25SI Broken at -27C

KA 2xMicron 4", LR(2kcm), OXYG, Irrad (10^14p(34MeV)/cm2)

61m APV25SI partially working, low signal

PD27 2xMicron 4", LR(2kcm), OXYG, Irrad(10^14p). 61m APV25SI works

BA2 2xCSEM 4", HR(7kcm), Irrad.(10^14p) 61m APV25S1 works

PER 2xMicron 4", LR, OXYG, Nonirrad 61m APV25S1

strange behaviour, partially works

PD26 2xMICRON 4",,LR(2kcm), OXYG, Nonirrad.

61m APV25S1 works

PSI test 4 - 24 Dec 2000

DPG 2001Frank Hartmann (IEKP)

NoisePreliminary

DPG 2001Frank Hartmann (IEKP)

Signal / NoisePreliminary

DPG 2001Frank Hartmann (IEKP)

Strip configurationSensors gallery

CSEM Ba1 pitch 61 mimplant 12.3 mmetal 11 m

Micron oxy (KA,PD,PG)Pd 26 pitch 61 mimplant 6.5 mmetal 17.2 m

Micron standard Pd 25 pitch 61mimplant 10 mmetal 10 m

CSEM Ba2 pitch 61 mimplant 12.6 mmetal 12.6 m

DPG 2001Frank Hartmann (IEKP)

Noise vs. Capacitive loadENC [e] = 400 + 60 / [pF]

600e “readout noise”

(bandwidth limitation)

Good agreement with data

SNR=16.5 @ C=15pF

DPG 2001Frank Hartmann (IEKP)

Conclusion

• S/N of 17-18 with final readout chip and 16 for a full irradiated module looks very promising.

• S/N differences are more related to CC and Cint values depending on strip width rather than from ox or nox.

• Sensor parameters like breakdown voltages, leakage currents and strip parameters after irradiation are well within CMS specification.

CMS specifies sensor behavior (parameters) after irradiation and not the oxygen content!!!

DPG 2001Frank Hartmann (IEKP)

DPG 2001Frank Hartmann (IEKP)

Signal

DPG 2001Frank Hartmann (IEKP)

The cool-box from Wien

Test performed at –10°C with N2 flushing andPeltier cooling

DPG 2001Frank Hartmann (IEKP)

The bunker& FAST professional cabeling

DPG 2001Frank Hartmann (IEKP)

Signal / Noise

Preliminary

DPG 2001Frank Hartmann (IEKP)

Electrical parameters

Detector SensorsVdep*(nirr)

Ileak*(nirr) (uA)

Vbkd Rbias(M) Cint(pF) Ccoupl(pF) Vdep(irr) Ileak(irr) Vbd(irr)                     

PD26 1962-16     650 1.4 4 95      

  2015-14     850 1.7 4 95      

PG                    

                     

BA1 Csem-13 129 4.6 550 20 1.8        

  Csem-22 133 4 550 22 1.8        

                     

PD27 1968-11 155   850 1.6 2.3        

  1968-8 126   850 1.6 2.2        

KA1962-17 (*)

165 4 850 2.2 2.1   350 400 850

  1962-24 130   800 1.7 (1.7 irrad) 2.3   280 400 800

BA2