Workshop on CMS irradiation sensor Qualification&Assurance

1

Final set of measurement for the irradiation quality assurance.

What test do we need?

EFFICIENT

NON-AMBIGUOUS

Sensitive to problems

Not too extensive, to show difficult statistical fluctuactions

Thorough to check all important parameters!

Thorough to check all important parameters! EFFICIENT

• All paramaters: V_dep, I_TOT, Strip Parameter

• But only on a subsample of strips

• All measurements in one measurement run (if possible)

• Strip measurement only on 2 DC pads!

10 20 30 40 50 60 705,00E-013

6,00E-013

7,00E-013

8,00E-013

9,00E-013

1,00E-012

normal measurement of Cint at DC-Pads with LCR at 1MHzAC-shorts between red strips

Inte

rstr

ip C

apac

itanc

e

strip number10 20 30 40 50 60 70

5,00E-013

6,00E-013

7,00E-013

8,00E-013

9,00E-013

1,00E-012normal measurement of Cint at AC-Pads with LCR at 1MHz

AC-shorts between red strips

Inte

rstr

ip C

apac

itanc

e

strip number

Not too extensive, to show difficult statistical fluctuactions or setup problems

• Problems with bonding or residuals of conductive rubber OR... could interfere with the measurement one strange result, even explainable by feature of the setup could possibly dis-qualify a complete batch of sensors

• e.g. CC @ conductive rubber remains:

0 20 40 60 80 100 120 140

20

40

60

80

100

120

Coupling Capacitance on TS H39

Before After irrad. and annealing

Co

ulp

ling

Ca

pa

cita

nce

[pF

]

ONLY sample of 10 strips! = FAST

Sensitive to problems RAMPSmore information of the strip paramter (here after irrad)

0 200 400 600 8001x106

2x106

3x106

4x106

5x106

6x106

7x106

Rpoly =U/INot corrected for leakage current

Rpoly

(O

hm

)

Voltage (V)

0 200 400 600 800

0,0

1,0x10-7

2,0x10-7

3,0x10-7

4,0x10-7

5,0x10-7

6,0x10-7

single strip leakage current

Leaka

ge c

urr

ent (A

)

Voltage (V)

0 200 400 600 800 10006,30E-013

6,32E-013

6,34E-013

6,36E-013

6,38E-013

6,40E-013

6,42E-013

6,44E-013

6,46E-013

6,48E-013

6,50E-013

Interstrip capacitanceOne neighbour

Cin

t (F

)

Voltage (V)

0 200 400 600 800 10001,00E-013

2,00E-013

3,00E-013

4,00E-013

5,00E-013

6,00E-013

7,00E-013

8,00E-013

9,00E-013

1,00E-012

1,10E-012

1,20E-012

1,30E-012

Before irrad (1MHz) Before irrad (100kHz) After irrad (1MHZ) After irrad (100kHZ)

Inte

rstr

ip C

ap

acita

nce

(F

)

Voltage (V)

Sensitive to problems RAMPSinterstrip resistance

0 100 200 300 400 500 600

1E-5

1E-4

1E-3

0,01

1E7

1E8

1E9

Interstrip resistance C5 MSE C6

Rin

t (O

hm)

// M

SE

Voltage (V) 0 10

1E-5

1E-4

1E-3

0,01

1E7

1E8

1E9

Interstrip resistance C5 MSE C6

Rin

t (O

hm)

// M

SE

Voltage (V)

Ke ith le y 6517 A

Sp a nnung sq ue lle

Ele ktro m e te r

+ -

Se nso rrüc kse ite

HP 661 4C

+

-

Calibration KA-LouvainIV & CV

-50 0 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 8500,00E+000

2,00E-010

4,00E-010

6,00E-010

8,00E-010

CV Karlsruhe CV Louvain

C_

TO

T (

F)

Voltage

0 100 200 300 400 500 6000,00E+000

2,00E-009

4,00E-009

6,00E-009

8,00E-009

1,00E-008

1,20E-008

1,40E-008

1,60E-008

1,80E-008

2,00E-008

IV Karlsruhe IV Louvain

To

tal l

ea

kag

e c

urr

en

t (A

)

Voltage (V)

KA: Offset due toAdd. 50pF (Iso-box)

Strip parameter ST teststructure calibration KA-Louvain

0 20 40 60 80 100 120 140100000

1000000

1E7

1E8

1E9

1E10

1E11

1E12

Interstrip Resistance ST teststructure

Inte

rstr

ip R

esis

tan

ce

Stripnumber

0 20 40 60 80 100 120 140

2,0x105

4,0x105

6,0x105

8,0x105

1,0x106

1,2x106

1,4x106

1,6x106

1,8x106

2,0x106

Rpoly Karlsruhe Rpoly Louvain

Rp

oly

(O

hm

)

Stripnumber

20 40 60 80 100 1208,00E-011

1,00E-010

Coupling capacity k595 Karlsruhe Coupling capacity LCR Karlsruhe Coupling capacity LCR Louvain

Co

up

ling

ca

pa

city (

F)

stripdata

Interstrip capacitance: KA 0.64pF (1 neighbour)Louvain 1.05pF (2 neighbours)

0 20 40 60 80 100 120 1404,00E-011

6,00E-011

8,00E-011

1,00E-010

1,20E-010

1,40E-010

1,60E-010

1,80E-010

2,00E-010

2,20E-010

2,40E-010

2,60E-010

2,80E-010

3,00E-010

Leakage current

Le

aka

ge

cu

rre

nt (A

)

Stripnumber

Future calibration

• Second calibration run

• Calibration with an irradiated teststructure

• Anealing curve as proposed by Alexander and and agreed with Louvain

FINAL SET proposal (to freeze)• All measurements after 80 min @ 60°C and > 6h in the fridge• All measurements @-10°C• DIODE:

– IV, CV (1MHz with guard on GND)

I_TOT, V_dep, C_TOT, • Minisensor or full sensor

IV, CV on diode (1kHz)

Strip measurements: all on 2 DC pads• Rpoly, Cint, Rint, leakage current

» for 10 strips » With a voltage ramp 1V/s [1-30V] 10V/s [40-600V]

For the beginning: full check for pinholes