Comments on ladder structure 5 Feb Toru Tsuboyama

L6 ladder: Anatomy 最終的な組立（のりづけ）の手順はまだ決まってい ない。 2012/10/4 Task sharing and logistics 2 6-Z 6CE 6+Z Mount block Ribs PF1/PF2 F-Hybrid Mount block DSSD B-Hybrid PB1/PB2 Airex (foamed plastic) sheet PA1/PA2 Origami hybrid

Origami PCB 6-Z PCB PA0 PA1 PA2 1) Glue APV chips and control/power lines are wire-bonded. 2) PA0 are glued and wire bonded for Z-strip signal. 3) PA1 and PA2 are glued and wire bonded for r-  strip signal.

Origami module assembly 1) APV chips are glued and control /power lines are wire-bonded. 2) PA0 are glued and wire bonded for Z- strip signal. 3) PA1 and 2 are glued to DSSD bottom surface and wire bonded to for r-  strips. 4) DSSD and the Airex sheet are glued below the PCB. The wire bonding between Z strips and PA0 are done. 5) PA1 and PA2 are folded over PA0 bonding wires, and glued. The the bonding for the p-side is done. PCB PA1 PA2 DSSD PA0 APV25 Airex

Length of Origami/PF/PB It looks the present length of ORIGAMI PCB, PF1, PF2, PB1 and PB2 is determined from those models. I already submitted all the flex circuits. – I would like to know how tolerance this structure have. We still have some time to change length. DSSD T. Tsuboyama (KEK) PXD-SVD meeting, 5 Feb 2013, Watzler, Germany 5

Layer 6 Forward Origami Onuki and Sato are deciding the procedure how to complete the slanted part in Layer 6: slant DSSD, airex sheet, Origami 6+Z. Mechanically, it is no clear to me how the connector on Origami is fixed to the mount block side. DSSD T. Tsuboyama (KEK) PXD-SVD meeting, 5 Feb 2013, Watzler, Germany 6

DSSD-Rib height Barrel part 1.5 mm Slant part 1.0 mm 1.0 mm is rather tight as we will apply 2-row bonding loop height 0.3 mm and 0.6 mm. Immanuel already knows this and is correcting the design. DSSD T. Tsuboyama (KEK) PXD-SVD meeting, 5 Feb 2013, Watzler, Germany mm 1.0 mm

Sliding mechanism in forward Contradicting functions: Sliding in Z while fixing the r-  position and good heat conductivity. SVD2: – R-phi position is determined with a precision pin and long hole on the mount block. – The mount block is pushed to the end ring with screw. Torque is controlled. Grease is put in between. – Yet, Kohriki suspects the sliding really functional.. Belle2: Immanuel is thinking 2 types. – We do not need to conclude now. – Let us make both and compare with mock up. – For the March mock up we will use ________ type. DSSD T. Tsuboyama (KEK) PXD-SVD meeting, 5 Feb 2013, Watzler, Germany 8

Slant DSSD assembly Assembly of slanted sensor is not straight forward. – Wire bonding should be done when DSSD and hybrid are flat on a jig. After boding, they are bent. – Length of top and bottom pitch adapters should be adjusted so they will run parallel after bent. Gluing of kapton flex: – The width of glue should be at least 3 mm. Otherwise the glue is peeled when bent. – In case of SVD2 a glass piece is inserted and glued. – In order to add 2mm in forward region, a modification is necessary. Rib, mount block, flex length. DSSD T. Tsuboyama (KEK) PXD-SVD meeting, 5 Feb 2013, Watzler, Germany 9 3mm

“Naha” philosophy The holes for ribs and mount blocks are not for rotation. The symmetric structure (right) was necessary as these parts formed the rotation mechanism. If rotation is not necessary, a slim and long structure (larger moment) will be better if total area is kept same. DSSD T. Tsuboyama (KEK) PXD-SVD meeting, 5 Feb 2013, Watzler, Germany 10

ORIGAM, PA, PF, PB Design is submitted to company at end of Jan. Waiting for quotations. Previous “pre” estimation (cost and delivery) correct because masks and outer shapes are changed. At this time, we asked “quantity” not quality. If they give us “good” ones, we will pay for that. Due date: End of Japan fiscal year: End of March. DSSD T. Tsuboyama (KEK) PXD-SVD meeting, 5 Feb 2013, Watzler, Germany 11

Simplify the tasks. Can Airex sheet cut into two? – I do not think the rigidity of ladder is not compromised significantly if the Airex sheet is cut into 2 – If ladder assembly procedure becomes simpler, I propose to cut Airex for forard and backward part in Layer 6 DSSD T. Tsuboyama (KEK) PXD-SVD meeting, 5 Feb 2013, Watzler, Germany 12 6-Z 6CE 6+Z Mount block Ribs PF1/PF2 F-Hybrid Mount block DSSD B-Hybrid PB1/PB2

Ribs CFRP-Airex-CFRP structure is produced and machined in a company near HEPHY. Baseline assembly procedure: – The mount blocks and ribs are produced with ultimate precision and assembled on high precision stage. (*) – Then the mount block is placed on the ladder assembly jig. – DSSD and ORIGAMI will be glued on the jigs. Suggestion by Sato (SVD2 method) – Sato is afraid of remaining stress in Ribs at (*). – Mount block is precisely placed on the ladder assembly jigs. – Ribs are glued. High precision is not necessary: No stress to the ribs. – The DSSD and ORIGAMI modules are glued. DSSD T. Tsuboyama (KEK) PXD-SVD meeting, 5 Feb 2013, Watzler, Germany 13

Airex alternatives Airex (probably a foam PET) – A 3 mm thick sheet should be pressed to 1 mm in HEPHY. – PET is rad hard. Airex was OK at 70 Mrad has been proved. For the ORIGAMI R&D in IPMU, we bought a “foam kapton” sheet and compared with Airex. – 1mm-thick sheet is available from UBE Kosan company. – As for density, precision and gluing the foam kapton is fine. – Wire bonding and a pull tester measurement has been done: Foam kapton: Max 11 g. Foam kapton is slightly softer. Airex: Max 12g. Airex is slightly better. Some wires were cut in the middle before the foots are broken. Airex is crispy. – I confirmed foam Kapton is OK. However, as long as Airex supply is stable, we do not have to go to foam Kapton. DSSD T. Tsuboyama (KEK) PXD-SVD meeting, 5 Feb 2013, Watzler, Germany 14 Origami-mechanical sample Airex/foam Kapton Glass

Ladder assembly jigs ___ jigs have been submitted in total _____ jigs. The rest _____ jigs will be submitted by _____. Ladder assembly study with full jigs will start ____ Test will end _______ Feed back (modification) to the jigs _______ HEPHY and TIFR will start jig production, following the IPMU design in _____ (HEPHY) _______ (TIFR) Layer3 – Ladder assembly jigs in Melbourne starts: ______ – L3 assembly must be much simpler: DSSD T. Tsuboyama (KEK) PXD-SVD meeting, 5 Feb 2013, Watzler, Germany 15

VXD mockup in March 2013 Koike’s support system: Submitted Ladder design: – Layer 5 HEPHY, Layer 6 IPMU: Seriously made. – Layer 4: Al-only ladder can be made in KEK. – Layer 3: Melbourne is discussing with HEPHY. Even an Al-only design will give a clear idea of Layer 3 ladder design. – Slight design inconsistency could be absorbed in assembly. – How about reporting in 18 Feb SVD meeting so that we know what we will do in B2GM? B2GM in March: we will have all ladders. DSSD T. Tsuboyama (KEK) PXD-SVD meeting, 5 Feb 2013, Watzler, Germany 16

Logistics The era of SVD1/SVD2 was easier. – Hand carry is always accepted successful. – However, the policy of air company and customs changes. Exportation of DSSD/APV25 from KEK – Formal procedure should be processed to avoid unnecessary taxation. Negotiation with flight company or logistics company – Hand carry without prior negotiations should be avoided. A stable, safe and reliable container should be designed. – Ladders should be fixed by using ladder mount mechanism. – Should be packaged in shock-free containers if hand carry is not possible. Discussion should start before we start ladder assembly. DSSD T. Tsuboyama (KEK) PXD-SVD meeting, 5 Feb 2013, Watzler, Germany 17