IQC Louvain

1
IQC Louvain
News on Hard Soft gt Alanine Reader gt
Annealing Oven gt Structure test
automation Irradiation Results on ST-ROB2 gt
after routine annealing gt Comparison with
pre-irrad results gt Annealing Study
(n) Results on HPK
S. Assouak, E. Forton, Gh. Grégoire
2
Alanine Reader
Insert
Dosimeter
EMR Cavity

• Characteristics
• Repeatability 0,41
• Reproducibility 0,9
• Stability 0,3
• Fluence gt Dose 1-2 10-11 Gy cm2
• Dosimeter fading lt 2 /Year

PC
Electronics
Absolute dose calibration for doses ranging from
0,5 to 30 kGy (traceable to NIST)
3
Annealing Oven
Oven build and operational

• Characteristics
• Up to 12 structures (3 sensors)
• Tested from ambient to 200 C
• Heating speed 4C/min.
• Temp. spread lt 0,7 C
• Temp. stability vs time lt 0,3 C

4
Tests automation
5
Tests automation

• Application controls every instrument
• gt Probe station PA-200
• gt Chuck temperature (avoids
  condensation)
• gt SourceMeter, LCR

• Parameters
• gt Read in global variables
• gt Ramp up can be modified

• Output files
• gt XML file for database (need
  soft.)
• gt Individual CV, IV, Rint files (more
  convenient)

85 structure tests in 9 days (approx 1h each)
LabView routines hierarchy
6
Tests automation
Backplane capacitance noise causes difficulties
in Vdep determination
Before Irrad. gt still OK (slope
steep enough) After Irrad. gt problems
(noise in slope and plateau)
7
Condensation
Procedure to avoid condensation
gt After irradiation, Glove bag put on irrad. box
gt Glove bag inflated with cold dry air used
during irrad.
gt Irradiation support put in bag (dry air)
gt Transportation to lab in (already!) cold box
gt Unmouting of the sensors in another glove
bag (dry air)
gt Sensors put in individual bags in fridge
8
ST ROB2 results
Standard annealing gt 8 structures tested
gt After irradiation, sensors stored in fridge gt
Annealing of 80 minutes _at_ 60C gt Stored in
fridge for 1 night gt Measurements performed _at_
-10C

• gt Irradiation in april-may 2002
• gt Irrad. Temp.
  -10C
• gt Bias voltage
  650V
• gt Neutron fluence 1,6 1014
  n/cm2
• 
  /- 10

Annealing _at_ 50C gt 8 structures tested
gt After irradiation, sensors stored in fridge gt
Annealing of 15 minutes _at_ 40C gt Stored in
fridge for 8 hours gt Measurements _at_-10C
gt Effect of biasing during n-irrad. gt Annealing
on IV gt Annealing on other charact. ?
last 3 steps repeated several times !
9
ROB 2
CV Results
(before irrad.)
gt unable to determine a Vdep on structures !
IV Results
gt No bad structures found before irrad.
After
1 bad structure found after irrad. (gt 4,5 10-17
A/cm)
Temp. conditions
10
ROB 2
After
Istrip Results
Temp. conditions
Idiel Results
After
bad 10/160
11
ROB 2
Rint Results
bad 33/160
Rpoly Results
Before
After
Too high!
bad 10/160
Too low!
12
Before - after
Before
After
bad 0/160
Cac Results
Before
After
Cint Results
bad 0/160
13
ST ROB 2 summary
14
Annealing study
CV Results
(before irrad.)
IV/strip Results
Slight correction to to 10C, to be compared
with Ka results
15
Annealing study
Structure ID 30210414739923
R_poly
No changes
No changes (lower than before irrad.)
Interstrip resistance
16
Annealing study
Coupling capacitance
No changes
No changes
Interstrip capacitance
17
HPK results
Standard annealing gt 4 structures tested
gt After irradiation, sensors stored in fridge gt
Annealing of 60 minutes _at_ 80C gt Stored in
fridge for 1 night gt Measurements performed _at_
-10C
gt Irradiation in march 2002
Pre-irrad IB results gt 3 structures tested
gt Measurements performed _at_ -10C
18
HPK Irrad. results
Standard annealing gt 4 structures tested
gt Annealing of 60 minutes _at_ 80C
gt Irradiation in march 2002
Too High
19
HPK Irrad. results
20
HPK pre-irrad. results
Pre-irrad IB results gt 3/22 structures tested
gt Measurements performed _at_ -10C
Everything OK
21
Conclusions
Status
Annealing oven working Alanine dosimetry
working IQC-tests now fully automated CV
measurements to be improved
ST ROB2 structures seem OK HPK IB structures need
further tests
Next tests
HPK IB irradiations in June July
Ka-Louvain cross-cal.