1. Strawman A Status Report
Strawman A realistic geometry
Tests on Strawman A
Comments on Task list
C. Civinini
INFN – Firenze
A. Tricomi, M. Galanti
Universita’ and INFN - Catania

2. SLHC Simulation Meeting
Strawman A
Strawman A is now ‘partially’ on CVS: for instructions (thanks to Harry)
This can be considered as a production version for SLHC studies  no crashes reported so far
Implemented on CMSSW_1_8_4
Digi configurability (thanks Mike)
Not only xml geometry files but also modifications to the code to make it compatible with the new layout
Caveat:
It is a starting point
A family of strawmen A can be produced varying some parameters
Strawman A geometry is quite redundant
it can be reduced eliminating some layers  realistic Strawman
07/10/2008
C. Civinini
SLHC Simulation Meeting

3. Strawman A (R-Phi view)
6 ministrip
layers
2 trigger
doublets
4 pixel layers
07/10/2008
C. Civinini
SLHC Simulation Meeting

4. SLHC Simulation Meeting
Strawman A (R-Z view)
07/10/2008
C. Civinini
SLHC Simulation Meeting

5. Towards a realistic ‘strawman A’
Strawman A has a number of channels (mainly pixels from trigger layers) which is too high to be considered affordable
Tables from SLHCUpgradeSimulations/Geometry/test/trackerModuleInfo_StrawmanA.cfg
Strawman A
Active Surface [cm2]
# ROCs
# channels
# modules
Barrel - Pixels (PXB)
79552
24240
Endcap - Pixels (PXF)
2834.4
4320
672
Barrel - Strips (TIB + TOB)
85968
18132
Endcap - Strips (TID + TEC)
34624
7216
x 7
x 2.2
Original Geometry
Active Surface [cm2]
# ROCs
# channels
# modules
Barrel - Pixels (PXB)
11520
768
Endcap - Pixels (PXF)
4320
672
Barrel - Strips (TIB + TOB)
38160
7932
Endcap - Strips (TID + TEC)
34624
7216
07/10/2008
C. Civinini
SLHC Simulation Meeting

6. Layout modifications - Steps
Reduce trigger doublets radii: (done)
1-2: 30cm  25cm
3-4: 70cm  55cm
Reduce mini-strip layers: 64: (done)
One less in the TIB region (TIB3)
One less in the TOB region (TOB4)
Remove outer trigger doublet: (done)
No more strixel 3 and 4
Insert (again) TOB stereo layers: (done)
TOB 1 and 2 with standard strip length (no mini-strip)
Introduce material budget reduction in the pixel system: (to be done)
Already done without volume changes (material reweigthing) for phase 1 studies
Mini-strips in TOB stereo layers (to be done)
Add a third Pixel disk (to be done)
Each step will have
its own geometry set
saved in CVS
07/10/2008
C. Civinini
SLHC Simulation Meeting

7. Step 1: doublets at minimum radii
Saves 10% of
pixel channels
(pitches unchanged)
Big saves if Strixels
longitudinal size is
reduced.
This configuration
can also be used
to study the effect
of doublets radius on
Trigger.
07/10/2008
C. Civinini
SLHC Simulation Meeting

8. Step 2: TIB3 and TOB4 removed
Working version
But can be used to
study the effect
of strip Layers
reduction on
tracking
performance
07/10/2008
C. Civinini
SLHC Simulation Meeting

9. Step 3: strixel 3 and 4 removed
Working version:
Same comment
as before
07/10/2008
C. Civinini
SLHC Simulation Meeting

10. Step 4: TOB1 and TOB2 reinserted
Stereo TOB
layers build with
long strips (no
mini-strips)
-50% pixel ch.
-20% strip ch.
with respect to
Strawman A
07/10/2008
C. Civinini
SLHC Simulation Meeting

11. SLHC Simulation Meeting
StrawmanA Vs Step 4
Full geometry table in:
Strawman A
Active Surface [cm2]
# ROCs
# channels
# modules
Barrel - Pixels (PXB)
79552
24240
Endcap - Pixels (PXF)
2834.4
4320
672
Barrel - Strips (TIB + TOB)
85968
18132
Endcap - Strips (TID + TEC)
34624
7216
Realistic Strawman A
Active Surface [cm2]
# ROCs
# channels
# modules
Barrel - Pixels (PXB)
41408
5680
Endcap - Pixels (PXF)
4320
672
Barrel - Strips (TIB + TOB)
72288
14712
Endcap - Strips (TID + TEC)
34624
7216
07/10/2008
C. Civinini
SLHC Simulation Meeting

12. SLHC Simulation Meeting
Next steps
Reduce the inner pixel material budget
CO2 cooling
Part of the read-out electronics moved at high h
Third forward pixel disk
Stereo TOB layers with mini-strips
07/10/2008
C. Civinini
SLHC Simulation Meeting

13. Layout proposed by Geoff
Longer barrel layers to match PT layers, at present locations
Remaining end caps with present locations
Stereo layers
Stereo rings
PT layers to cover full h range
h = 2.5
Pixels: 4 barrel layers + increased size Endcap
could be 3 disks/endcap?
G. Hall
07/10/2008
C. Civinini
SLHC Simulation Meeting
July 2008
G Hall 13

14. Studies using Strawman A geometry
Tracking performances with pileup (standard multitrack validator):
Fast simulation done (L up to 1035 cm-2 s-1 easy to run)  results not too much significant, performance quite independent on pileup and geometries
Fast sim + digi + std reco to be done faster than full sim
Full sim + digi + std reco to be done (L as high as possible, limitations expected from CPU time and memory problems), needs one pileup set for each different geometry; performance for single particle tracking not significant
Occupancy:
Fast and Full simulation to be done  comparison and high luminosity estimations – intermediate results of previous points
07/10/2008
C. Civinini
SLHC Simulation Meeting

15. Comments on the Task list
Point 1 (trigger studies)
Strawman A can be used
Doublets parameters can be changed (strixel dimensions, doublets radii, doublets Dr)
One or two doublets
Point 2 (4th pixel layer)
Strawman A (modified)
4 pix + 2 strix (present strawman A)
3 pix + 2 closer strix (step 1)
5 pix and no strip (not implemented)
Point 3 (Strawman A tracking performance)
Realistic strawman A
Occupancy and tracking performance (see previous slide)
07/10/2008
C. Civinini
SLHC Simulation Meeting