Ronald Lipton

Layer 0 Status PMG Sep 7 2004

Status of the Layer 0 Project – emphasis on hardware status, preproduction, and preparations for shutdown work

• Parts Status• Pre-production modules • Survey• Conclusion

Analogcables

Sensors

CF Support

Ronald Lipton

Parts Status

• Sensors– Received 112 of 120 ordered ~July 31 (8 others in ~Nov)– All IV, CV tested at FNAL –

• 3 out of spec due to large I/V. Will be used for prototypes

– No bad channels ! (spec 1%)– Four sensors sent to StonyBrook for strip probing– Will irradiate test structures plus a sensor at KSU

• Analog Cables– Received and tested mid-July – look very good

• Fixtures– Most now received from MSU - detailing the last sets this

week

Ronald Lipton

Parts Status

• Pitch Adapters– Received 13 (71m) + 34 (81m) pitch adapters from

TFT mid August (ordered 50+50, need 24+24). We require 100% good lines and the yield is low.

– TFT overall quality is ~ok, wirebond strengths 6-7 grams. Expect to receive order of 50+50 from TFT Seigert Sept. 10th. We will then decide if we need to press for the remainder of the TFT order.

• Hybrids– Received 119/120(ordered) last Thursday

• 69 should meet all specs• 50 cut 8 mils long – should be OK

– Will stuff 10 at SiDet to check functionality and for use in prototype modules

Ronald Lipton

Support Structure

• A prototype support structure to be used for electrical testing was received Aug 11. Mechanical damage was noted when the part was unpacked. The structure was broken at z=0 and one of the sensor-hybrid joints.

• The part was packed in a cardboard tube surrounded by bubble wrap inside a ~8” diameter ABS plastic tube.– The outer tube was permanently deformed with a sagitta

of ~1” – this corresponds to hundreds of pounds of force if the cylinder is simply supported

• The ABS tube was not sufficiently rigid to withstand the load. The bubble wrap was too rigid and transmitted the bend to the inner cylinder – Bad packing design.

• The structure was repaired by injecting epoxy into the cracked areas – can be used for electrical tests

Ronald Lipton

Boroscope image of crack region

Ronald Lipton

Support Structure

• The shipping problems should not delay the final structure• New inner mandril is being machined using low stress steel• Need to fabricate the (complex) manifold structures• Expect on-time delivery (Mid Oct) of final support structure

– Well off the critical path

• Most other mechanical parts in hand– Mesh spacers, ceramic standoffs ….

• Cables are being fabricated– Digital junction cable ordered– Twisted pair cable received

Ronald Lipton

Modules

We now have all parts necessary for modules. Plan:• Build a set of four 71 micron pitch modules to populate a segment of

the prototype support cylinder for a full wedge electrical test.• These will be built with the final fixtures• We will then decide if we want more prototypes for testing 71/81

stack or can go into final module production (beginning to mid October)

First Prototype module built last week:• Bias current 150 nA @ 100 V

(Depletion voltage 200 V)• Noise ~ 22 counts @ 100 V 32 counts @ 0 V

Bondingproblems

Ronald Lipton

Fall 2004 Shutdown

• Survey of the Z=0 gap (more later)• We plan to install and operate a 4-hybrid SVX4 string

during the 2004 shutdown. This will allow us to test a mixed SVX2/4 readout system with the associated controls and download software.

• Reroute H disk cables to accommodate L0 requirements (separate inner and outer)

• Operate the cooling system at lower temperature

• No H disk refurbishment The work associated with floatingthe platform was deemed to take too much time to allow for this work

Ronald Lipton

Aperture Measurement

• We plan to measure the aperture at z=0 using standard survey instruments (Brunson)

• This was mocked up in Lab 3

Ronald Lipton

Ronald Lipton

Beam Pipe and Inner Disk

Ronald Lipton

Lab 3 Test

• Membranes to simulate those of the Run 2a support structure were located at the following nominal z-positions in mm (inches):– +/- 0.317 (0.012)– +/- 540.466 (21.294)– +/- 829.819 (32.670)

• All apertures were nominally 1.875” in diameter.• Those at z = 0 were nominally offset horizontally by 0.062”.• A simulated 96” long beam tube with a flange diameter =1.697” extended

through the simulated Run 2a structure.• A pair of external CF cylinders blocked light and access• Cardboard sheets were used to represent the ends of the L1-4 structure.• A Brunson survey instrument was used for the measurements.• We found that a ROI light source for a CMM provided good illumination.• All Brunson images were clear and distinct, with no color bands

Ronald Lipton

Aperture Measurement

• A 0.059” membrane offset was measured using the Brunson, compared to 0.060” measured on a CMM

• The technique works but there must be proper illumination and support for the survey instruments

• The inner H disks do not have to be removed for the survey. Removing the outer disks would make the survey easier because of the limited space between the beam pipe and the H disk cover. We have decided to try the survey without removing the outer H disks – but will be prepared to remove and reinstall them if necessary.

• Expect to begin this work ~ Sept. 27

Ronald Lipton

Layer 0 Summary

• All parts ~in hand– Need to stuff and test hybrids– Need to receive Seigert pitch adapters– Verify performance of new hybrids

• We will survey the installation gap during the shutdown• We will install 4 SVX4 test strings and recable the H disk

readout – this will give us operational experience with a mixed system and force us to develop and test software.

• Expect to begin module production in late October – depending on hybrid stuffing schedule

• On or ahead of schedule for July 21 move date with ~6 weeks of SiDet testing