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Pixel Endcaps in the LoI (Cartigny) Layout

The drawings below show 3 possible types of pixel endcap disks in the LoI, or "Cartigny" layout of the upgraded inner tracker. The original Cartigny layout called for six disks, at the z positions shown in the table below, with outer active radius of 315mm and inner active radii of 135mm (disks 1-4), 175mm (disk5) and 215mm (disk 6). These specifications can not be met exactly with the current module designs and assuming the simplest possible disk layout (shown below), where all modules are fixed directly to the front and back surfaces of a flat disk.


The closest match to the requested dimensions are illustrated in the drawings above. These disks use 'quad' modules (modules built on 4 FEI4 chips in a 2x2 grid placement) and 'hex' modules (built on 6 chips in a 2x3 grid). Disks 1-4 would have the 'QHH' geometry shown in the leftmost picture ('QHH' for Quad-Hex-Hex as the innermost ring is made of quad modules and the middle and outer rings are made of hex modules). Disk 5 is QQH and Disk 6 is QH. This results in the dimensions shown in the table below:

z (mm) Rinner (active) (mm) Router (active) (mm)
822 150.1 315.0
960 150.1 315.0
1140 150.1 315.0
1360 150.1 315.0
1600 170.6 315.0
1890 212.4 315.0

Dimensions assumed:

  • 0.45mm gap between adjacent FEI4s in a module
  • sensor dead edge 0.2mm radially
  • a hex module is 61.3mm long radially
  • a quad module is 40.85mm long radially
  • >0.2mm gap required between adjacent modules on a disk, to isolate HV
LoI backup document

The pixel disk backup document for the Phase-II Letter of Intent can be found here:

Rectangular 3-quad Prototype

To put here:

- concept sketch

- assembly photos

- thermal camera photos and data

- liverpool and glasgow FEA results

Thermal FEA

To put here:


Single-row Halfdisk Prototype

Conceptual drawings:


Engineering drawings:


  • general outline / Cfibre face sheet
  • cooling pipe

Construction photographs:


  • vacuum jig
  • one foam wedge
  • wedges glued to facesheet
  • cooling pipe sample
Stepped Geometry Disk Sector

Peter Sutcliffe's drawings for a sector of a stepped-geometry disk:

Bus Tapes

The bus tape design from the pixel barrel is being adapted for disks by Yiorgos Sidiropoulos at Edinburgh. Details can be found in this presentation (in two parts, to beat twiki's 20MB upload limit):

Talks (in reverse chronological order ie newest first):
Topic attachments
I Attachment History Action SizeSorted descending Date Who Comment
PDFpdf 25_01_13_Flex-tapes_for_the_ATLAS_pixel_Half_Disk_22-end.pdf r1 manage 11273.4 K 2013-02-08 - 14:08 JoleenPater Yiorgos' slides on disk bus tape design: pages 22 to end
PDFpdf 25_01_13_Flex-tapes_for_the_ATLAS_pixel_Half_Disk_01-21.pdf r1 manage 9916.0 K 2013-02-08 - 14:07 JoleenPater Yiorgos' slides on disk bus tape design: pages 1-21
JPEGjpg OneFoamWedge.jpg r1 manage 1013.9 K 2013-02-21 - 15:36 JoleenPater single-row half-disk cooling pipe
JPEGjpg PrototypePipes.jpg r1 manage 753.7 K 2013-02-21 - 15:36 JoleenPater single-row half-disk cooling pipe
JPEGjpg Prototype-sandwich.jpg r1 manage 633.7 K 2013-02-21 - 15:33 JoleenPater  
JPEGjpg MP12003_00_A2.jpg r1 manage 265.3 K 2013-02-21 - 15:40 JoleenPater single-row half-disk cooling pipe
JPEGjpg Disk0-3_QHH_Halfdisk.jpg r1 manage 174.6 K 2013-02-20 - 16:17 JoleenPater Quad-Hex-Hex (QHH) Halfdisk
JPEGjpg Disk4_MixedSizes.jpg r1 manage 155.5 K 2013-02-20 - 16:21 JoleenPater Quad-Quad-Hex (QQH) disk
JPEGjpg GluingJig.jpg r1 manage 150.9 K 2013-02-21 - 15:36 JoleenPater single-row half-disk cooling pipe
JPEGjpg Disk5_MixedSizes.jpg r1 manage 137.5 K 2013-02-20 - 16:21 JoleenPater Quad-Hex (QH) disk
PNGtiff Disk0-3_QHH_Halfdisk.tiff r1 manage 93.9 K 2013-02-20 - 16:13 JoleenPater Quad-Hex-Hex (QHH) Halfdisk
JPEGjpg ATLAS_Pixel_Single_-_Row_Half_Disk.jpg r1 manage 80.5 K 2013-02-21 - 15:35 JoleenPater single-row half-disk cooling pipe
JPEGjpg Back.jpg r1 manage 42.9 K 2013-02-08 - 16:25 JoleenPater Sketch of back side of single-row half-disk prototype
JPEGjpg Front.jpg r1 manage 42.0 K 2013-02-08 - 16:25 JoleenPater Sketch of front side of single-row half-disk prototype
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Topic revision: r6 - 2013-02-21 - JoleenPater
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