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CCE measurements on ATLAS07 and ATLAS12 in Ljubljana

Igor Mandić, Jožef Stefan Institute, March 2014

• Setup • Alibava readout system, Kazu.ini settings• Keithley 2410 HV unit• 90Sr source • only detector cooled with Peltier element, not the readout chip

• detectors• A12 irradiated with neutrons : 5e14, 1e15, 2e15, 5e15 • A12 irradiated with 70 MeV protons at KEK: 1.8e15, 2.5e15• A12 irradiated with 26 MeV protons at Birmingham: 1e15• A07 irradiated with neutrons: 5e14, 1e15

• CCE measurements• before and after annealing at 60 C• compare A07-A12

Igor Mandić, Jožef Stefan Institute, March 2014 2

• measurements of A12 detectors after neutron irradiations and after annealing for 80 min. at 60 C• at fluences 5e14 and 1e15 two detectors were measured (full and dashed lines)• there are variations between measurements statistics needed

Neutrons, A12

Igor Mandić, Jožef Stefan Institute, March 2014 3

at lower voltages (below 800 V) more charge after protons than after neutrons at same fluence seen also with A07 (oxygenated material)

Protons vs. neutrons

Igor Mandić, Jožef Stefan Institute, March 2014 4

Charge vs fluence

• charge vs. fluence at 500 V (triangles) and 900 V (squares) for different irradiations, annealed 80 min at 60 C

at 500 V charge after protons higher than after neutrons

Igor Mandić, Jožef Stefan Institute, March 2014 5

Annealing, A12 detectors

• compare charge measured before and after annealing for 80 minutes at 60 C• detector annealed in the Alibava setup (i.e. no mounting and dismounting ….)

more annealing after 70 MeV protons (at Cyric) than after neutrons (in Ljubljana)

Igor Mandić, Jožef Stefan Institute, March 2014 6

ATLAS12 / ATLAS07 comparison

• A07 and A12 irradiated with neutrons in same irradiation fluences are the same• detectors irradiated together measured with same Beetle chip chip gain the same

Comparison of 80 minutes at 60 C annealing factors• 5e14 A07 charge increases more (~30% vs. ~15%) at intermediate bias • 1e15 A12 charge increases more should compare with measurements from other groups

Igor Mandić, Jožef Stefan Institute, March 2014 7

ATLAS12 / ATLAS07 comparison

• at 5e14 A07 much more charge than A12 some difference would be expected because of different initial Vfd

• almost no difference at 1e15 need more measurements by other labs to confirm

5e14 n 1e15 n

Igor Mandić, Jožef Stefan Institute, March 2014 8

ATLAS12 / ATLAS07 comparison

Charge vs. fluence after 80 minutes annealing at 60 C A07 detectors dashed lines A07 measurements with SCT128 (data from 2010) at 5e14 not so much larger than A12

Igor Mandić, Jožef Stefan Institute, March 2014 9

Long term annealing at 60°

• A12 irradiated with neutrons to 1e15• A07 irradiated with neutrons to 1e15, measured with SCT128 (old data, NIMA 629 (2011) 101) (dashed line)• A12 and A07 annealing looks similar at this fluence

1e15 n

Igor Mandić, Jožef Stefan Institute, March 2014 10

Conclusions

• A12 detectors measured after irradiation with neutrons and protons

• at lower bias voltages (~ 500V) collected charge larger after protons then after neutrons• 80 minutes annealing at 60 C larger after 70 MeV protons than after neutron irradiation

• comparison A07-A12• after 5e14 neutrons and at 500 V ~30% more charge measured with A07 than with A12

more measurements needed to confirm• after 1e15 neutrons no significant difference• some differences of annealing factors after 80 minutes at 60 C

after 5e14 neutrons A07 anneals more, after 1e15 A12 anneals more• at 1e15 similar long term annealing A07 and A12

Future work:

• Edge-TCT with A12 detectors• irradiation with 23 MeV protons in Karlsruhe and CCE and E-TCT after that