1. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 1 Status of insertable pixel  Layout in 2000 (Dubna layout)  Reasons for the change (and boundary conditions)  Design of insertable pixel  layout  insertion method  service routing and patch panels  Simulation results  coverage and resolution  material  Road to ECR

2. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 2 Dubna layout  3 barrel layers (R b = 5cm,R 1 =9.3cm,R 2 =12.7cm ) and 10 disks (6 with 11 sectors and 4 with 9 sectors).  Services at high R, except for b_layer running at R~8cm to allow for independent insertion of b_layer.

3. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 3 Reasons for change  Rad-hard submissions to DMILL (tested in detail in 2000) revealed unexpected problems for our FE design. After some trials with DMILL, migration to DSM technology was judged necessary. This has generated a schedule delay of at least 15 months and made impossible (or very risky) to install the pixel inside the barrel ID on the SR building (on 4/2004).  Installing pixel separately from ID gives also more freedom in case of production problems (more likely for a novel detector) and allows easier upgrade & repair (all vertex detectors undergo upgrade sooner or later).

4. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 4 Layout update  Why we did not propose it before?  mechanics more difficult (and a lot of redesign if half-shelled)  more material (services at lower radius, more massive mechanics)  conflicts with SCT (inner bore + alignment)  A solution was found to keep the present design approach (shell and disks) and install pixel in absence of the beam pipe section just outside the barrel, i.e.  break vacuum (as in long shutdown scenario), remove section of b_pipe, and  install pixel during ~2 months (<< long shutdown timescale)  The layout redesign implies some shrinkage after envelope agreement with SCT [smaller radii by ~5mm (R 1 =8.7cm,R 2 =12.2cm) and less and smaller disks (3+3, 8 sectors each)]  less modules to build (2094  1744; i.e. – 17%)  less robust PR at large .  some (~2%) acceptance losses for 3-hit coverage.  Further optimization difficult without loosing one hit  shrunk from outside (SCT bore) and inside (beam pipe) and in-the-middle (requirement of b_layer independently extractable  rails)

5. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 5 Insertable layout  All services go at low radius up to the barrel end  b_layer services all out on one side  keep independent b_layer insertion/extraction 1400m m  =2  =2.5

6. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 6  Barrel design also updated to slightly increase clearance between staves  safer mount/dismount and pigtail routing (clearances~1.5mm (1 for b_layer))  Flex -hybrid module (as opposed to MCMD) adopted also for b_layer

7. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 7 Design of insertable pixel  A permanent CF tube is installed with ID  this allows to slide in pixel+services sliding in through the beam pipe flange SCT TRT 3450mm 3400mm (end-plug face) PP0 Overlap region Z=[750,1070] PP1 In End-Plug Z=3400 Length of service panel Pixel + Pigtails 795mm (Barrel Tube half length) Pixel Frame is 1400mm long Without pigtails Side CSide A

8. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 8  The insertion process is done when the Forward Calorimeter is retracted and the relative beam pipe section is out.  First the far services and the pixel frame are inserted Far Services Pixel Frame Beam pipe support Inner Detector Bore Beam pipe Far Services in Quadrants 2.65m Services need to extend beyond end of Beam pipe support frame to allow termination of overlapping pigtails Z=3450 (this bears some investigation) 500mm (comfortable Human-width) 2270mm To end of Pigtails

9. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 9  Far services terminated, pixel detector inserted Far Services Terminate Far Services 2270mm To end of Pigtails 300-500 for Cantilevered support 2770mm Over mechanical support Z=3450 Far side barrel pigtails need to fold back over frame to give access to PP0 Z=6220mm Z=5720 Cantilever structure necessary to support beampipe during installation— same as for ID forward installation

10. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 10  Then the near services are connected and slided in Far Services Near Services 3400 (end of support tube) Support wire at 3450 re-attached Frame end just inside tube (Frame end to PP0 gap is 50mm) (2.65m + 50mm) 2.7m 6.1m Far Services Termination to B-Layer services occurs inbound of Support wire

11. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 11  Assembly order require connections at different locations (PP0 and PP1) but simplifies PP2 Pigtail PP1 “Type I” 2.7m “Type II” 3.2m to PPB2 PPB1 Pixel Volume Patch PPF1 To PP3 PP0 Location PPB2 No Longer Used Voltage drop on low mass cables becomes more challenging. Timed well with DSM change (everything changes)

12. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 12  The b_layer must be clam-shelled as it does not pass through the beam pipe flange without opening.  the b_layer can (in principle) be inserted without breaking the vacuum. Far Services 1.2m Far Services TOP View Vertical Support Halves are inserted around wire--required tooling is not shown Halves are closed and fixed together B-layer is inserted into Pixel Frame using same rails in pixels as for baseline

13. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 13  Cartoon of b_layer insertion Preliminary design of tooling structures is consistent with space available now. Length of 1.2m required Halves are held together by longitudinal actuation

14. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 14  Finish of b_layer installation Far Services To terminate the services to the B-layer, and the rest of the detector, the detector must be withdrawn to gain access B-layer services are terminated first as they will be obscured by the rest of the pixel services The B-Layer is then pushed into the frame into its final position. Depending on the length of the Pigtails on the B-layer, this step may be avoided B-layer Services

15. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 15 7A 6A 8A 2A 4A 1A 5A 3A 6C 7C 5C 3C 1C 4C 8C 2C 4CBL 2CBL 3CBL 1 1CBL Needs update for new stave count (90) Services routing (octants)

16. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 16 PP0   Radius of PP0 is approximately 180mm   Starts at Z=750 and goes to Z=1070 (50mm gap between PP0 and Frame) Z_400.7 Z_440 650495580 R_190 R_90 100mm 205mm 260mm 50mm 120mm Z_700 130mm 50mm 30mm 160mm Bi-Stave Assy 6X7X 370mm End of Pixels+Pigtails Z_1070 End of Pixel Frame

17. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 17 Rail system on support tube Vee and Flat rails were chosen to provide pseudo-kinematic support for the detector during delivery to the support points Rails are used only for delivery, not support

18. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 18 Support tube mock-up   Sufficient space acquired in old Bevatron Generator Room (@LBNL)   Enough space to simulate entire assembly sequence   Mockup in three pieces to simulate independent parts of tube   Goal is for full length of entire tube to simulate all installation scenarios   Detector rails are removable, should modification be necessary

19. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 19 Scope of tube mock-up  Mass and Envelope Geometry of final detector Frame  Attempting for similar friction as well  At least two full quadrants of “dummy” service panels  Initially 1-quadrant, both sides, eventually half of all services  At least two octants (both sides) of mechanically accurate connection  Needed for installation simulation  At least one octant of electrically active service connections  This is to provide verification that terminations stay terminated through procedure  Might prove useful for thermal mockup  Provision for Dummy B-Layer installation  Requires also mechanical connections for installation simulation Expected to be ready (tube + services) by end of March

20. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 20 Simulation results  Coverage  first disk cannot come too close to barrel end (service routing) Barrel-to-disk two hit hole Assume all tracks coming from (0.0.0)

21. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 21  Geometric hit losses (not including electronics , dead channels) Vertex smearing included

22. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 22 200 GeV   Resolution does not change appreciably  e.g. in b_layer

23. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 23 200 GeV   Transverse impact parameter slightly improves  MCMD --> flex (51.5 to 50  m pixel size), smaller radii of layers 1&2 and larger stave tilt angle  Longitudinal i.p. worsens at high   less disks and algorithm not yet tuned for long clusters in b_layer

24. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 24 1 GeV   No change of i.p. resolution vs Dubna layout, sensible change vs physics TDR layout mostly due to increase of the b_layer radius (4 -> 5cm)  beam pipe X 0 (1mm Be -->1.6mm Be) and radius (24 -->38mm) increase not yet included in simulation (new beam pipe not yet released).

25. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 25 Material  increase mostly due to support tube + services at low radius  mean increase up to  ~2 is ~0.6%X 0

26. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 26 Material with less layers  We will likely start-up with 2 layers

27. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 27 Low-energy tails in EM calorimeter spectra   Study of effects on EMC and on b_tagging just started Tails  event fraction with E rec < 0.92 E true Layout Tails  =0.3 Tails  =2.4 Physics TDR 9.5  0.6% 3.6  0.6% Insertable 11.3  0.7% 9.6  0.9% Vertex spread included Events over full  and  =0.025 (1 cell) Electrons E T =10 GeV  = 2.4 Normalised to same number of events

28. LHCC referee meeting L.Rossi - INFN / Genova CERN - March 19 - 2001 28 Steps to ECR  On design/mock-up  April: put together mock-up support tube and dummy services  June 18: Comprehensive Design Review of global supports + insertion tube  June-Aug: electrically active tests and thermal simulation of mock-up  October: mechanical testing of assembly procedure  On simulation  compare reconstruction efficiency and b_tagging with TDR  study effect of material increase on tracking and EM calorimetry (and reduce material whenever possible).  Time-scale for ECR: Summer 01.