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HFT PXL Mechanical WBS 1.2 March 2010 Howard Wieman LBNL 1.

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Presentation on theme: "HFT PXL Mechanical WBS 1.2 March 2010 Howard Wieman LBNL 1."— Presentation transcript:

1 HFT PXL Mechanical WBS 1.2 March 2010 Howard Wieman LBNL 1

2 Topics - PXL (WBS 1.2) PXL reminder Installation steps design and tooling 2

3 Pixel geometry. These inner two layers provide the projection precision 2.5 cm radius 8 cm radius Inner layer Outer layer End view One of two half cylinders 20 cm  coverage +-1 total 40 ladders 3

4 Some pixel features and specifications Pointing resolution(12  19GeV/p  c)  m LayersLayer 1 at 2.5 cm radius Layer 2 at 8 cm radius Pixel size18.4  m X 18.4  m Hit resolution8  m rms Position stability6  m (20  m envelope) Radiation thickness per layer X/X 0 = 0.37% Number of pixels436 M Integration time (affects pileup) 0.2 ms Radiation requirement20 to 90 kRad 2* to MeV n eq/cm 2 Rapid detector replacement < 8 Hours critical and difficult more than a factor of 3 better than other vertex detectors (ATLAS, ALICE and PHENIX)

5 HFT PXL status – fabrication and tooling 5

6 HFT PXL – insertion design 6 insertion mechanism to guide detector around beam pipe and beam pipe support uses track and carriage with hinge and cam to guide into final docking position

7 BBC reminder 7

8 HFT PXL – installation design a well controlled method for installation of the pixel detector has been developed with emphasis on ease of operation and avoidance of detector risk The PXL assembly will be enclosed in a carrying box that is equipped for transfer of the detector assembly into the PXL support tube Once inserted on tracks the detector is guided into position locking kinematic mounts 8

9 9 HFT PXL – installation design

10 10 remove box rails slide detector home remove box and connect services

11 detector insertion 11

12 12

13 Vacuum chuck for probe station 13

14 14

15 15

16 maneuvering the detector into the IP with cams and rails PIT PST 16

17 MSC Pixel Insertion Tube Pixel Support Tube IDS East Support Cylinder Outer Support Cylinder West Support Cylinder PIT PST ESC OSC WSC Shrouds Middle Support Cylinder Inner Detector Support Structures Exploded Detail Assembly via bolted interfaces MSC installed into IDS after IDS assembled (detectors not shown) IDS w/MSC installed into STAR 17

18 Fixturing operations addressed: PIT flange attachment PIT rail attachment Rail testing system PST flange attachment PST kinematic attachment SSD locating fixture Spatial mapping of the pixels with the Coordinate Measuring Machine (CMM) 18

19 PIT flange attachment assemble PIT end plate fixture load flanges on PIT and insert into the PIT end plate fixture bond flanges (middle flange?) cut holes for rail mounts ready for rail mounting 19

20 cut holes in PIT for rail supports install cutting guide, cut 4 holes flip guide, cut 4 more rotate PIT 180 deg, repeat for 8 more holes 20

21 21 apply glue and mount to rails with post passing through holes insert rails with rail holder fixture Bond rail supports bonded rail support

22 22 remove post freeing rails and rail holder for removal remove rails and rail holder release rails from rail holder remove PIT from end fixtures (can’t remove with rails in place) reattach rails to PIT with correctly identified posts keep track of which post goes with which pad

23 23 PIT with rails attached

24 rail tester 24 rail_test_system.SLDASM (operation view)

25 tester rail attachment Assemble PIT flange mounting plates Assemble tester frame 25

26 install rail holder with rails, posts and bond pads removed spread glueattach post and bond pad cams are removed so that cross bars (not shown) coupling rails constrain the rotation angle in the guides 26

27 remove posts removing the posts allow that rails and rail holder to be removed. Rails without the rail holder can then be reattached to the rail tester by reinstalling the posts. 27

28 attach kinematic mounts to rail tester butch plate grand master with kinematic mounts cross arms base plate attached to grand master remove rails mount butch plate apply glue to cross arms and base plate attach grand master to butch plate after glue sets remove butch plate and separate rail tester from PIT end plates reattach rails tester is now complete grand master can be detached from base plate for later use after testing is complete 28

29 PST flange attachment Assemble PST end plate fixture load flanges on PST and insert into the PST end plate fixture bond flanges cut holes (fixture yet to be designed) Now ready for attaching the kinematic mounts 29

30 PST kinematic mount attachment 30 remove east PST end plate attach empty grand master to east PST end plate attach PST end plate with grand master back on to the PST fixture east PST end plate grand master

31 kinematic mount 31 assemble kinematic mounts with bond feet attach mount with feet to cross bar apply adhesive adhesive

32 PST kinematic mount attachment 32 attach kinematic mounts to grand master by securing cross bar to grand master allow setup and remove cross bars from feet and grand master detach grand master from east PST end plate and support the grand master so that it does not load PST Remove end plates and grand master PST done

33 Summary of PST kinematic attachment remove east PST end plate attach empty grand master to east PST end plate attach PST end plate with grand master back on to the PST fixture assemble kinematic mounts with bond feet attach mount with feet to cross bar apply adhesive attach kinematic mounts to grand master by securing cross bar to grand master allow setup and remove cross bars from feet and grand master detach grand master from east PST end plate and support the grand master so that it does not load PST Remove end plates and grand master PST done 33

34 OSC fixture The PIT fixture will also be used for the OSC since the OSC and PIT are the same diameter. The base plate will be changed to set the correct length – fixture used for placing the OSC flanges – flats and reference groves used to position SSD supports. Up to 6 ladder supports can be installed at one setting. The OSC is rotated in the fixture by 180 deg to do the remaining attachments. 34

35 Coordinate Measuring Machine (CMM) configuration 35 The grand master fixture is also used to support the detector halves in the CMM for doing the spatial map of the pixels. The fixture is supported in the CMM with 3 point support on the tooling balls for all the required angular positions. The relative mapping of all the tooling balls provides the required cross referencing of all the angular positions. The same kinematic supports are used here as are used in the STAR detector installation.

36 backup 36

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