1. 1 David Santoyo Petal Locking Points: AUW Nov 2014 Petal Locking Points

2. 2 David Santoyo Petal Locking Points: AUW Nov 2014 EC stiffening disk is located between d6 and d7 Latest considerations – EC design BH mechanically decoupled from EC at final position Length of rails and inner cylinder reduced down to disk 7. service modules still extend beyond the BH

3. 3 David Santoyo Petal Locking Points: AUW Nov 2014 Service tray x16 We loose some space to insert petals between disk 7 and 6 due to stiffening disk. Petals have to be inserted inclined w.r.t. discs since there is not enough RΦ clearance.

4. 4 David Santoyo Petal Locking Points: AUW Nov 2014 Blades HC Korex-5/32-2.4 (or Structural foam) 1mm thick ‘T’ beam CF T300/RS3 0.18mm thick XN50/RS3 CF facing Petal insertion guide In this model blades play an important structural role. They provide Quasi-kinematic locking points for the petal and the required stiffness while allowing to reduce the Z distance between petals in a disk and cope with the required hermeticity for low momentum tracks and They are very low density structures (can be made even lighter)

5. 5 David Santoyo Petal Locking Points: AUW Nov 2014 Locking points (nose side) A peek through screw or a dowel pin. (R, Z and Φ constrains) A rotating flap (Z constrain)

6. 6 David Santoyo Petal Locking Points: AUW Nov 2014 Locking points (opposite to nose) If petals must be inserted in angle the local supports should be adapted for that constrain Preliminary design to insert petals in angle

7. 7 David Santoyo Petal Locking Points: AUW Nov 2014 Locking points (opposite to nose) HC Korex-5/32-2.4 (or Structural foam) 0.18mm thick XN50/RS3 CF facing Insertion guide Constrains Z and Φ

8. 8 David Santoyo Petal Locking Points: AUW Nov 2014 8 service trays ? Petals connected in series on both sides of the service tray By removing every second service module, the space for petal insertion is increased Recent developments from NIKHEF show that cooling 2 petals in series would be more efficient for the given pipe diameter. https://indico.cern.ch/event/306927/session/0/contribution/23/material/slides/ We could reduce the number of module services by a factor 2. See “common mechanics session”.

9. 9 David Santoyo Petal Locking Points: AUW Nov 2014 Service tray x8 Space available to insert petals increases Petals can be inserted parallel to disk plane May allow for new insertion methods

10. 10 David Santoyo Petal Locking Points: AUW Nov 2014 EC Finite Element Model Update to FEA results shown in https://indico.cern.ch/event/306927/session/10/contribution/92/material/slides /

11. 11 David Santoyo Petal Locking Points: AUW Nov 2014 FEA global structure: adding Si modules -Si wafers -0.3 mm -1.31 g/cc -7 GPa -Thermal glue -0.2 mm -2.34 g/cc -112.4 GPa Silicon sensors added to the petals to check out how much they affect to the EC structure behaviour Petal local supports being studied

12. 12 David Santoyo Petal Locking Points: AUW Nov 2014 1st CASE2nd CASE3rd CASE Max. VM structure2,34MPa4,25MPa5,29MPa7,43MPa5,54MPa8,1MPa Max. VM Petal2,1MPa4,03MPa5,15MPa7,26MPa5,4MPa7,92MPa Max. VM Blade1,92MPa2,62MPa1,98MPa2,05MPa1,65MPa1,37MPa Max. DX STATIC12,9um9,93um14um12,5um13,9um12um Max. DY STATIC19,5um16,5um23,8um22,7um23,1um21,1um Max. DZ STATIC3,17um2,64um4,4um4,08um3,85um5,08um 1st Frecuency Mode22,163Hz22,632Hz21,834Hz22,317Hz21,957Hz22,397Hz Max. DX PSD 3σ7,32um6,75um8,07um7.95um7,95um7,65um Max. DY PSD 3σ5,52um5,04um5,85um5.76um5,76um5,58um Max. DZ PSD 3σ9,45um8,43um9,75um8.58um9,78um8,55um How does affect Si wafers for EC structure analysis?

13. 13 David Santoyo Petal Locking Points: AUW Nov 2014 Summary Still too “conceptual” Seems to work on the simulations We need to find proper implementations of the locking mechanisms that do not hinder petal insertion and removal  Shall we insert by ➘ sliding along blade or ➘ (if space allows) parallel to disk or ➘ By first inner radius and then upper radius ?  Blade’s C-channel opposite to nose, constrain effectively in z and Φ  “Nose” fixation and blade’s C-channels constrain R, Z and Φ  Is the petal properly fixed in Z with the nose fixation and the flap? We may want to add some extra fixation Is it petal insertion “friendly” ? Need to exercise and characterize with Endcap mock-up