slide1 l.
Skip this Video
Loading SlideShow in 5 Seconds..
Start of the tracker construction in Italy: flight sensors and ladder testing PowerPoint Presentation
Download Presentation
Start of the tracker construction in Italy: flight sensors and ladder testing

Loading in 2 Seconds...

play fullscreen
1 / 22

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

  • Uploaded on

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.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'Start of the tracker construction in Italy: flight sensors and ladder testing' - KeelyKia

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

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


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



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

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


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


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


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


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


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



SSD geometrical measurements: data analysis

distribution stdev compatible with experimental error


Ladders qualification

see LAT-TD … )

  • Currently qualifying two suppliers
  • G&A Engineering

Ladders assembled with flight sensors and final tools




Ladders qualification

SSD alignment check


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


Ladders qualification: leakage current

Long term test started: observed steady current increase of

~40 % in first 12 hrs.



  • 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