Difference: EndcapLayout (12 vs. 13)

Revision 132014-02-06 - JoleenPater

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Sergey Burdin's "Concentric Diskettes" Endcap Layout

A couple of talks showing the basic idea: 2013-06-26_Burdin_Rings.pdf

and a later update with a more sophisticated layout: 2013-08-27_Jones_Lpool_Status.pdf.

Caculation of diskette sizes (J.Pater) using spreadsheet found below:

Using the same module dimensions given above, assuming the same active coverage as the quad-hex-hex LoI -layout disks:

Physical outer radius of ring 2 modules: centres not corners - corners will extend further 315.2
Active outer radius of ring 2 modules: centres not corners 315.0 same as LoI
Active inner radius of ring 2 modules: centres not corners 274.6
Physical inner radius of ring 2 modules: centres not corners 274.4
Physical outer radius of ring 1 modules: centres not corners - corners will extend further 253.0
Active outer radius of ring 1 modules: centres not corners 252.7
active CENTRE of ring 2 modules 232.5
Active inner radius of ring 1 modules: centres not corners 212.3
Physical inner radius of ring 1 modules: centres not corners 212.1
Physical outer radius of ring 0 modules: centres not corners - corners will extend further 190.7
Active outer radius of ring 0 modules: centres not corners 190.5
Active inner radius of ring 0 modules: centres not corners 150.1 same as LoI
Physical inner radius of ring 0 modules: centres not corners 149.9
Number of modules per ring, rounded up to be divisible by 4 (front/back, left/right clamshell):

Ring 2: 60  
Ring 1: 48  
Ring 0: 36  
Jo's spreadsheet for calculating numbers of rings: PixelDiskDimensions.xlsx

BELOW HERE IS OLDER INFORMATION - may no longer be relevant

 
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.

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Disk0-3_QHH_Halfdisk.jpgDisk4_MixedSizes.jpgDisk5_MixedSizes.jpg
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Disk0-3_QHH_Halfdisk.jpgDisk4_MixedSizes.jpgDisk5_MixedSizes.jpg
  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:
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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
 
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Dimensions assumed:
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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
Line: 17 to 34
 
LoI backup document

The pixel disk backup document for the Phase-II Letter of Intent can be found here: http://cds.cern.ch/record/1515010/files/ATL-UPGRADE-PUB-2013-004.pdf

Changed:
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Sergey Burdin's "Concentric Diskettes" Endcap Layout

A couple of talks showing the basic idea: 2013-06-26_Burdin_Rings.pdf

and a later update with a more sophisticated layout: 2013-08-27_Jones_Lpool_Status.pdf.

Caculation of diskette sizes (J.Pater) using spreadsheet found below:

Using the same module dimensions given above, assuming the same active coverage as the quad-hex-hex LoI-layout disks:

Physical outer radius of ring 2 modules: centres not corners - corners will extend further 315.2
Active outer radius of ring 2 modules: centres not corners 315.0 same as LoI
Active inner radius of ring 2 modules: centres not corners 274.6
Physical inner radius of ring 2 modules: centres not corners 274.4



Physical outer radius of ring 1 modules: centres not corners - corners will extend further 253.0
Active outer radius of ring 1 modules: centres not corners 252.7
active CENTRE of ring 2 modules 232.5
Active inner radius of ring 1 modules: centres not corners 212.3
Physical inner radius of ring 1 modules: centres not corners 212.1



Physical outer radius of ring 0 modules: centres not corners - corners will extend further 190.7
Active outer radius of ring 0 modules: centres not corners 190.5
Active inner radius of ring 0 modules: centres not corners 150.1 same as LoI
Physical inner radius of ring 0 modules: centres not corners 149.9






Number of modules per ring, rounded up to be divisible by 4 (front/back, left/right clamshell):


Ring 2: 60  
Ring 1: 48  
Ring 0: 36  


Jo's spreadsheet for calculating numbers of rings

PixelDiskDimensions.xlsx

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