[AGKetzer-ALICE] Fwd: CERN Detector Seminar - 11 April - 11:00 - 40/S2-C01

[Bernhard Ketzer]

Dear all,

this will probably be an interesting talk.

Cheers

	Bernhard



-------- Weitergeleitete Nachricht --------
Betreff: 	CERN Detector Seminar - 11 April - 11:00 - 40/S2-C01
Datum: 	Fri, 4 Apr 2025 11:19:00 +0200
Von: 	EP Seminars and Colloquia <EP-seminars.colloquia at cern.ch>
An: 	EP-Seminars-announcement (People interested in EP Seminars and 
Colloquia) <EP-Seminars-announcement at cern.ch>



Dear all,

In the next EP Detector Seminar, we will have a presentation on the 
following topic: *ALICE ITS3 - A bent wafer-scale monolithic pixel detector*

It will be given on *11 April at 11:00* in room *40/S2-C01*

Connection details are given on the Indico page: 
https://indico.cern.ch/event/1535022/ 
<https://indico.cern.ch/event/1535022/>

_Title and Speaker_:
*ALICE ITS3 - A bent wafer-scale monolithic pixel detector*

*by Alex Kluge (CERN)*

_Abstract_:

ALICE is upgrading its inner three silicon tracker layers with a bent 
wafer-scale monolithic pixel detector (ITS3).
Each layer comprises two sensors, 27 cm long, 50 µm thick and bent to 
concentric half-layers around the beam pipe (radii: 19, 25, 32 mm) 
supported by carbon foam stiffeners. The sensors with 40 mW/cm² 
consumption and a material budget of 0.07% X0 per layer are air-cooled.
Fabrication of 27 cm long sensors, requires stitching at foundry level 
connecting identical reticle-sized sensor elements, bypassing the need 
for flexible printed circuits.
Pixel test structures on a 300 mm, 65 nm TPSCo technology were validated 
with a resolution of 5 µm, an efficiency of > 99%, a fake hit rate of < 
10-2/pixel/s and a radiation load of 4*1014 1 MeV neq cm-2. These 
findings were further corroborated with 26 cm long Monolithic Stitched 
Sensor prototypes, confirming the stitching and integration process in 
laboratory and beam tests.
Prototype silicon sensors thinned to ≤ 50 µm were successfully bent to 
the ITS3's required radii while retaining full functionality. Mechanical 
engineering models with 50 µm thick dummy sensors demonstrated a 
mechanical stability of ± 0.5 μm under an 8 m/s airflow, consistent with 
the sensor’s power consumption and the interconnection scheme.
The design of the final full-function sensor prototype (MOSAIX) with a 
pixel size of 22.8 x 20.8 µm2 is underway. The seminar will report on 
the R&D phase, the final sensor design and detector integration.

Organized by Burkhard Schmidt

Coffee will be served at 10:30

Seminars and Colloquia Secretariat
CERN, EP Department