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Start of the tracker construction in Italy: flight sensors and ladder testing - PowerPoint PPT Presentation

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Start of the tracker construction in Italy: flight sensors and ladder testing. Luca Latronico. Tracker construction roadmap. Tower Structure (walls, fasteners) Engineering: SLAC, Hytec Procurement: SLAC. SSD Procurement, Testing Japan, Italy, SLAC. SSD Ladder Assembly Italy.

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Start of the tracker construction in Italy:

flight sensors and ladder testing

Luca Latronico

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Tracker construction roadmap

Tower Structure (walls, fasteners)

Engineering: SLAC, Hytec

Procurement: SLAC

SSD Procurement, Testing

Japan, Italy, SLAC

SSD Ladder Assembly


Tower Assembly and Test

SLAC (2)

Italy (16)



Tray Assembly and Test




Electronics Design, Fabrication & Test



Composite Panel & Converters


SLAC, Hytec, and Italy

Procurement: Italy

Cable Plant


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SSD storage and handling

1484 SSDs (~14% of total) received so far

  • SSD come in vacuum sealed boxes

  • Boxes are stored in a clean room

  • Clean room class during operation was between 1000 and 10000

  • (thanks to observation of strict regulations, e.g. mandatory disposable

  • coat, hat, overshoes, gloves, face mask)

  • SSD are flushed in N2 when boxes are open

  • Vacuum pens are used for SSD handling

  • SSD exit clean room after a new vacuum seal

  • Every process step in registered in a DB

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SSD and Tracker Construction DB

see for full documentation on construction DB

  • discussion with tracker institutions (SLAC, UCSC, Hiroshima)

    started around one year ago

  • guidelines documents produced (e.g. LAT-TD-00376, LAT-TD-


  • working protoype developed and used in Pisa

  • continuous vital interplay between DB development –

    measurements requirements in the clean room – statistical

    analysis of data – data transfer between manufacturers and


  • all results shown were produced using our DB

  • finally publish DB and analysis tool on the web for LAT managers

    to use

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Analysis of data from HPK

  • HPK provides:

  • at batch level - from an SSD taken at sample in the batch, min, max, avg

  • values of the following:

    • strip bias resistor

    • strip coupling capacitance

    • strip resistance

  • at single SSD level:

    • IV scan 0-200V (Ileak is I measured at 150V)

    • CV scan 0-200V (Cbulk is C at 150V)

    • Vdep – defined as V where F(V) - F(V-5) < 0.0039, with F=1/C2[nF]

    • bad strips ID and defect type

Currently working on a common DB, in collaboration with HPK engineers to maximize data transfer efficiency

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Analysis of data from HPK

see for full report

Ileak specs:

I < 600nA single SSD

I < 200nA averaged on 100 SSD

Stdev(Cbulk) ~ 2 mm

all within specification

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Analysis of data from HPK

see for full report

Vdep specs:

V <150V

Chans specs:

Bad chans rate < 0.2%

< 3/single SSD

still two clusters of bulk resistivity but most SSD stand at the preferred higher values

all within specification

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SSD Pisa clean room measurements

see (LAT-TD-00454)

  • Electrical

  • strips (p+) grounded / back plane (n) at variable V(+)

  • use calibrated instrumentations (Vsource,p-ammeter,LCR)

  • read through GPIB/LabView

  • data can upload DB automatically

CV scan 0-200V

Cbulk at 150V

Vdep with:

2 fit intersection

HPK definition

IV scan 0-200V

Ileak at 150V

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SSD clean room measurements

see (LAT-TD-00454)


  • pixel/mm calibration on

  • reference cross

  • measure distance of

  • reference cross centre

  • to X and Y edge (all

  • corners, DXA,DYA,DXB…)

  • cut alignment evaluated

  • with:

Shift= (DyA+DyD)/2


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SSD geometrical measurements: data analysis

distribution stdev compatible with experimental error

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Ladders qualification

see LAT-TD … )

  • Currently qualifying two suppliers

  • G&A Engineering


    Ladders assembled with flight sensors and final tools



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Ladders qualification

SSD alignment check

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Ladders qualification: mechanics

  • bonding pull strength between 6-9 gr. (measured at Mipot)

  • bonding encapsulation (at G&A):

dam (3M Scotchweld 2216 A/B )

+ fill (General Electric 615)

pure epoxy

(3M Scotchweld 2216 A/B)

both good but more experience with dam&fill

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Ladders qualification: leakage current

Long term test started: observed steady current increase of

~40 % in first 12 hrs.

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  • Flight sensors testing proceeds at full speed :

  • primary activity of the whole italian collaboration

  • involves people from all institutions

  • goes on everyday for 8 hrs. (electrical) + 4 hrs. (geometrical)

  • already at maximum speed for electrical (20min/SSD)

  • possible little speed up for geometrical (now 12min/SSD) if images

    are automatically processed

  • still some room for optimization in data transfer to DB from

    electrical and geometrical measurements setups

  • new requirements from data analysis and data transfer every day –

    big impact on DB development

  • Ladder qualification:

  • two manufacturers involved in the process

  • both gave successful results