ATLAS FP TRACKER PLANS

Steve WattsSchool of Physics and AstronomyUniversity of Manchester

• Well defined design in the FP420 Design Report Based on the FE-I3 ATLAS Pixel Readout chip.

• Design suitable for 220 but needs roughly double the number of sensors. Layout is more difficult and power dissipation is higher.

• Radiation level close to beam is very high. Implications for the readout chip. Sensor is good to 1-2 1016 charged hadrons cm-2 300-600 MRad

Consequence – New Design for the Tracker…… R&D is linked to 3D sensor developments for IBL and SLHC

220 m420 m

FE-I3 Lifetime issue 1015 charged particles per cm2 or ~30 MradSOLUTION A 3D sensor safe to 1-2 1016 charged hadrons per cm2

Dose highest in very narrow vertical band.

Move sensors up and down by 1-2 mm to even out the dose

Trick used with CCDs in NA32. Additional specification for mechanical design.Would give a factor 3.

• New FE-I4– Pixel size = 250 x 50 µm2

– Pixels = 80 x 336– Technology = 0.13µm– Power = 0.5 W/cm2

• FE-I4 Design Status– Contribution from 5 laboratories.– Main blocks MPW submitted in Spring

2008.– Full FE-I4 Review: 2/3/3009– Submission in Summer 2009

– Expect IBL modules late 2010

7.6mm

8mm active

2.8mm

FE-I3 74%

20.2mm

active16.8mm

~2mm

~200μm

FE-I4 ~89%

Char

tere

d re

ticul

e (2

4 x

32) IBM

retic

ule

~19 mm

FE-I3 - lifetime issueSolution B

Use FE-I4. Factor 5 more radiation tolerant than FE-I3. For IBL projectPlus - better matched to track hit distribution at 220. - Common module design for 220 and 420 - 2 x Fe-I4 each plane

NOTE: IMPROVED Y-Measurement. Consequence for physics ???NOTE2: Assumes hits distribution stable with time…..

FE-I3 versus FE-I4

• FE-I3 run had very poor yield. There will be another run in 2010.

• FE-I4 First run will produce chips in summer/Autumn 2010

ASIC designs always take more than one iteration.

FE-I4 3D sensor is larger and thus yields will be lower.

Conclusion

FE-I4 baseline. There will be 3D/FE-I4 detectors developed for IBL.

Mechanics/electronics engineers to look at FE-I4 design.

FE-I4 - common 220/420 mechanics design