Difference between revisions of "ITk Endcap At Nikhef"

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''[https://wiki.nikhef.nl/atlas/ITk_Endcap_Homepage Back to ITk Endcap Homepage]''
+
<math>\blacktriangleleft</math> ''[https://wiki.nikhef.nl/atlas/ITk_Endcap_Homepage Back to ITk Endcap Homepage]''
 +
----The construction of the ITk Strip End-caps at Nikhef.
  
−
The construction of the ITk Strip End-caps is done at Nikhef. On this page, you will find the information related to that process.
+
Contents author: Andrea García Alonso (aalonso@nikhef.nl)[[File:EC1 on 25-05-2023.jpg|thumb|EC1 structure on 25/05/2023|397x397px|alt=|left]]
−
[[File:EC1 on 25-05-2023.jpg|none|thumb|EC1 structure on 25/05/2023]]
 
−
Author: Andrea García Alonso
 
  
−
==Wheel production==
+
==Wheels==
  
 
===Wheel conduction after assembly===
 
===Wheel conduction after assembly===
Line 23: Line 22:
  
  
−
==End-cap structure==
 
  
−
=== - Wheel installation ===
+
== Stiffening disk ==
−
The produced wheels have been installed in the two end-caps as shown in the table. Wheels with Erno number 1 and 14 don't belong to any EC (spare).
+
[[File:Stiffener disk thermal deformation tests on 21-01-2022.jpg|thumb|alt=|350x350px|One of the thermal deformation tests on one of the stiffening disks. Picture of 21-01-2022]]The stiffening disks of the End-caps, made of Ultem foam with a carbon-fiber face-sheet, were produced and tested at Nikhef. The stiffening disks provide structural stiffness to the EC and act as a thermal barrier. To certify that the three manufactured stiffening disks comply with the specifications, an ATLAS internal note was written to explain the thermal deformation tests carried out at Nikhef, at the end of 2021 and the beginning of 2022. Although it is quite difficult to measure small thermal deformations on such big structures, three tests were performed: temperature changes, local temperature gradients, and global temperature gradients. The results show that the deformations in two disks are consistent with the specifications. The remaining disk is chosen as spare since it deforms above expected, although still mechanically acceptable.
−
{| class="wikitable"
+
 
−
!End-cap wheel
 
−
position
 
−
!Erno
 
−
number
 
−
!Dutch-shape
 
−
number
 
−
|-
 
−
|End-cap A - Wheel#0
 
−
|11
 
−
|19056-13-A7
 
−
|-
 
−
|End-cap A - Wheel#1
 
−
|2
 
−
|19056-15-B2
 
−
|-
 
−
|End-cap A - Wheel#2
 
−
|9
 
−
|19056-13-A3
 
−
|-
 
−
|End-cap A - Wheel#3
 
−
|13
 
−
|19056-15-b6
 
−
|-
 
−
|End-cap A - Wheel#4
 
−
|7
 
−
|19056-13-A2
 
−
|-
 
−
|End-cap A - Wheel#5
 
−
|12
 
−
|19056-15-B5
 
−
|-
 
−
| 
 
−
| 
 
−
| 
 
−
|-
 
−
|End-cap C - Wheel#0
 
−
|6
 
−
|19056-13-A1
 
−
|-
 
−
|End-cap C - Wheel#1
 
−
|4
 
−
|19056-15-B3
 
−
|-
 
−
|End-cap C - Wheel#2
 
−
|10
 
−
|19056-13-A4
 
−
|-
 
−
|End-cap C - Wheel#3
 
−
|5
 
−
|19056-15-B4
 
−
|-
 
−
|End-cap C - Wheel#4
 
−
|8
 
−
|19056-13-A6
 
−
|-
 
−
|End-cap C - Wheel#5
 
−
|3
 
−
|19056-13-A5
 
−
|}
 
  
−
===- Characterization of mechanical behaviour EC structure at cold temperatures===
+
[[File:ATL-COM-ITK-2022-064.pdf|border|center|thumb|ATLAS Note with all the EC stiffening disk QC]]
−
[http://wiki.nikhef.nl/atlas/ITk_Endcap_Structure_TemperatureStudies EC structure temperature studies]
+
You can find the ATLAS internal note called "Temperature deformation tests of the ITk strip end-cap stiffening disks produced at Nikhef" here: https://cds.cern.ch/record/2824857. In case you don't have access, please contact Andrea García Alonso.
  
−
===- Stiffener disk measurements===
+
[http://wiki.nikhef.nl/atlas/ITk_Endcap_StiffenerDisk Stiffening Disk]
−
The stiffening disks of the End-caps, made of Ultem foam with a carbon-fiber face-sheet, were produced and tested at Nikhef. The stiffening disks provide structural stiffness to the EC and act as a thermal barrier. To certify that the three manufactured stiffening disks comply with the specifications, an ATLAS internal note was written to explain the thermal deformation tests carried out at Nikhef, at the end of 2021 and the beginning of 2022. Although it is quite difficult to measure small thermal deformations on such big structures, three tests were performed: temperature changes, local temperature gradients, and global temperature gradients. The results show that the deformations in two disks are consistent with the specifications. The remaining disk is chosen as spare since it deforms above expected, although still mechanically acceptable.
 
  
−
You can find the ATLAS internal note called "Temperature deformation tests of the ITk strip end-cap stiffening disks produced at Nikhef" here: https://cds.cern.ch/record/2824857. In case you don't have access, please contact Andrea García Alonso.[[File:Stiffener disk thermal deformation tests on 21-01-2022.jpg|none|thumb|alt=|400x400px|One of the thermal deformation tests on one of the stiffener disks. Picture of 21-01-2022]]
 
−
[http://wiki.nikhef.nl/atlas/ITk_Endcap_StiffenerDisk Stiffener Disk]
 
  
−
===- PP1 patch panel===
 
−
[http://wiki.nikhef.nl/atlas/ITk_Endcap_PP1_PatchPanel PP1 Patch Panel]
 
  
−
=== - Cooling manifolds ===
+
== Cooling manifolds ==
 
The ITk strip End-cap detector consists of 6 wheels that each accommodate 32 petals. The petals are cooled with a 2-phase CO2 system using cooling service modules that serve 16 petals, corresponding to half a wheel.  
 
The ITk strip End-cap detector consists of 6 wheels that each accommodate 32 petals. The petals are cooled with a 2-phase CO2 system using cooling service modules that serve 16 petals, corresponding to half a wheel.  
−
[[File:Cooling manifold.png|none|thumb|500x500px|Cooling manifold]]
+
[[File:Cooling manifold.png|none|thumb|367x367px|Cooling manifold]]
  
 
====== Status on 1st June 2023: ======
 
====== Status on 1st June 2023: ======
Line 108: Line 42:
  
 
All manifolds for disk 1 and disk 2 are fabricated, the As and Bs for disk 3 are fabricated as well. Disk 2, outlet manifolds A, B, C and D are cleaned by 31st May 2023.
 
All manifolds for disk 1 and disk 2 are fabricated, the As and Bs for disk 3 are fabricated as well. Disk 2, outlet manifolds A, B, C and D are cleaned by 31st May 2023.
−
[[File:Manifolds_status_06-06-2023.jpg|alt=|none|thumb|500x500px|Manifolds production status on 06/06/2023]]
+
[[File:Manifolds_status_06-06-2023.jpg|alt=|none|thumb|457x457px|Manifolds production status on 06/06/2023]]
  
 
====== Summer 2023: Pressure tests + leak tests + alcohol flushing ======
 
====== Summer 2023: Pressure tests + leak tests + alcohol flushing ======
−
Every manifold is tested at high pressure and a check for leaks is performed. Afterwards, every manifold is internally cleaned with alcohol.
+
Every manifold is tested at a high pressure (170 bar) and a check for leaks is performed using Helium. Afterwards, every manifold is internally cleaned with alcohol to assure that no small particles could eventually block the capillarities to which the manifold will be connected.
  
−
Test reports and status available here: [https://cernbox.cern.ch/files/spaces/eos/user/m/marcelv/ITK-map/Production/Results/Sub_Assembly/Pressure_test_SA cernbox.cern.ch/files/spaces/eos/user/m/marcelv/ITK-map/Production/Results/Sub_Assembly/Pressure_test_SA]
+
Test reports and status available here:  
 +
 
 +
[https://cernbox.cern.ch/files/spaces/eos/user/m/marcelv/ITK-map/Production/Results/Sub_Assembly/Pressure_test_SA cernbox.cern.ch/files/spaces/eos/user/m/marcelv/ITK-map/Production/Results/Sub_Assembly/Pressure_test_SA]
 
{| class="wikitable mw-collapsible"
 
{| class="wikitable mw-collapsible"
−
|+Status of the inlet and outlet manifolds for EC1 (A-B) and EC2 (C-D)
+
|+
 +
Status of the inlet and outlet manifolds for EC1 (A-B) and EC2 (C-D)
 
!Inlet  
 
!Inlet  
 
manifold
 
manifold
Line 142: Line 79:
 
|-
 
|-
 
|Disk 0 - A
 
|Disk 0 - A
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|
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|✓
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|
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|✓
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|
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|✓
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|
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|✓
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|YES
 
|
 
|
 
|Disk 0 - A
 
|Disk 0 - A
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|-
 
|-
 
|Disk 0 - B
 
|Disk 0 - B
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
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+
|✓
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|YES
 
|
 
|
 
|Disk 0 - B
 
|Disk 0 - B
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|-
 
|-
 
|Disk 0 - C
 
|Disk 0 - C
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|
 
|
 
|Disk 0 - C
 
|Disk 0 - C
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|-
 
|-
 
|Disk 0 - D
 
|Disk 0 - D
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|
 
|
 
|Disk 0 - D
 
|Disk 0 - D
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|-
 
|-
 
|Disk 1 - A
 
|Disk 1 - A
 
|✓
 
|✓
−
|05/10/23
+
|✓
−
|05/10/23
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|
 
|
 
|Disk 1 - A
 
|Disk 1 - A
 
|✓
 
|✓
−
|06/10/23
+
|✓
−
|06/10/23
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|-
 
|-
 
|Disk 1 - B
 
|Disk 1 - B
 
|✓
 
|✓
−
|26/07/23
+
|✓
−
|26/07/23
+
|✓
−
|08/09/23
+
|✓
 
|YES
 
|YES
 
|
 
|
 
|Disk 1 - B
 
|Disk 1 - B
 
|✓
 
|✓
−
|01/08/23
+
|✓
−
|01/08/23
+
|✓
−
|03/10/23
+
|✓
 
|YES
 
|YES
 
|-
 
|-
 
|Disk 1 - C
 
|Disk 1 - C
 
|✓
 
|✓
−
|27/07/23
+
|✓
−
|27/07/23
+
|✓
−
|08/09/23
+
|✓
 
|YES
 
|YES
 
|
 
|
 
|Disk 1 - C
 
|Disk 1 - C
 
|✓
 
|✓
−
|
+
|✓
−
|
+
|✓
−
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+
|✓
−
|
+
|YES
 
|-
 
|-
 
|Disk 1 - D
 
|Disk 1 - D
 
|✓
 
|✓
−
|27/07/23
+
|✓
−
|27/07/23
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|
 
|
 
|Disk 1 - D
 
|Disk 1 - D
 
|✓
 
|✓
−
|02/08/23
+
|✓
−
|02/08/23
+
|✓
−
|03/10/23
+
|✓
 
|YES
 
|YES
 
|-
 
|-
 
|Disk 2 - A
 
|Disk 2 - A
 
|✓
 
|✓
−
|12/07/23
+
|✓
−
|13/07/23
+
|✓
−
|11/08/23
+
|✓
 
|YES
 
|YES
 
|
 
|
 
|Disk 2 - A
 
|Disk 2 - A
 
|✓
 
|✓
−
|28/07/23
+
|✓
−
|28/07/23
+
|✓
−
|14/09/23
+
|✓
 
|YES
 
|YES
 
|-
 
|-
 
|Disk 2 - B
 
|Disk 2 - B
 
|✓
 
|✓
−
|11/07/23
+
|✓
−
|11/07/23
+
|✓
−
|11/08/23
+
|✓
 
|YES
 
|YES
 
|
 
|
 
|Disk 2 - B
 
|Disk 2 - B
 
|✓
 
|✓
−
|28/07/23
+
|✓
−
|28/07/23
+
|✓
−
|14/09/23
+
|✓
 
|YES
 
|YES
 
|-
 
|-
 
|Disk 2 - C
 
|Disk 2 - C
 
|✓
 
|✓
−
|13/07/23
+
|✓
−
|13/07/23
+
|✓
−
|11/08/23
+
|✓
 
|YES
 
|YES
 
|
 
|
 
|Disk 2 - C
 
|Disk 2 - C
 
|✓
 
|✓
−
|31/07/23
+
|✓
−
|31/07/23
+
|✓
−
|20/09/23
+
|✓
 
|YES
 
|YES
 
|-
 
|-
 
|Disk 2 - D
 
|Disk 2 - D
 
|✓
 
|✓
−
|18/07/23
+
|✓
−
|19/07/23
+
|✓
−
|11/08/23
+
|✓
 
|YES
 
|YES
 
|
 
|
 
|Disk 2 - D
 
|Disk 2 - D
 
|✓
 
|✓
−
|31/07/23
+
|✓
−
|31/07/23
+
|✓
−
|20/09/23
+
|✓
 
|YES
 
|YES
 
|-
 
|-
 
|Disk 3 - A
 
|Disk 3 - A
 
|✓
 
|✓
−
|20/07/23
+
|✓
−
|20/07/23
+
|✓
−
|31/08/23
+
|✓
 
|YES
 
|YES
 
|
 
|
 
|Disk 3 - A
 
|Disk 3 - A
 
|✓
 
|✓
−
|01/08/23
+
|✓
−
|01/08/23
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|-
 
|-
 
|Disk 3 - B
 
|Disk 3 - B
 
|✓
 
|✓
−
|24/07/23
+
|✓
−
|24/07/23
+
|✓
−
|31/08/23
+
|✓
 
|YES
 
|YES
 
|
 
|
 
|Disk 3 - B
 
|Disk 3 - B
 
|✓
 
|✓
−
|02/08/23
+
|✓
−
|02/08/23
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|-
 
|-
 
|Disk 3 - C
 
|Disk 3 - C
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|
 
|
 
|Disk 3 - C
 
|Disk 3 - C
 
|✓
 
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|-
 
|-
 
|Disk 3 - D
 
|Disk 3 - D
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|
 
|
 
|Disk 3 - D
 
|Disk 3 - D
 
|✓
 
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|-
 
|-
 
|Disk 4 - A
 
|Disk 4 - A
 
|✓
 
|✓
−
|26/07/23
+
|✓
−
|26/07/23
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|
 
|
 
|Disk 4 - A
 
|Disk 4 - A
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|-
 
|-
 
|Disk 4 - B
 
|Disk 4 - B
 
|✓
 
|✓
−
|05/10/23
+
|✓
−
|05/10/23
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|
 
|
 
|Disk 4 - B
 
|Disk 4 - B
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|-
 
|-
 
|Disk 4 - C
 
|Disk 4 - C
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|
 
|
 
|Disk 4 - C
 
|Disk 4 - C
 
|✓
 
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|-
 
|-
 
|Disk 4 - D
 
|Disk 4 - D
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|
 
|
 
|Disk 4 - D
 
|Disk 4 - D
 
|✓
 
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|-
 
|-
 
|Disk 5 - A
 
|Disk 5 - A
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|
 
|
 
|Disk 5 - A
 
|Disk 5 - A
 
|✓
 
|✓
−
|09/10/23
+
|✓
−
|09/10/23
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|-
 
|-
 
|Disk 5 - B
 
|Disk 5 - B
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|
 
|
 
|Disk 5 - B
 
|Disk 5 - B
 
|✓
 
|✓
−
|09/10/23
+
|✓
−
|09/10/23
+
|✓
−
|
+
|✓
−
|
+
|YES
 
|-
 
|-
 
|Disk 5 - C
 
|Disk 5 - C
 +
|✓
 +
|✓
 +
|✓
 +
|✓
 +
|YES
 
|
 
|
 +
|Disk 5 - C
 +
|✓
 +
|✓
 +
|✓
 +
|✓
 +
|YES
 +
|-
 +
|Disk 5 - D
 +
|✓
 +
|✓
 +
|✓
 +
|✓
 +
|YES
 
|
 
|
−
|
+
|Disk 5 - D
−
|
+
|✓
−
|
+
|✓
−
|
+
|✓
−
|Disk 5 - C
 
 
|✓
 
|✓
 +
|YES
 +
|}
 +
 +
==PP1 patch panel==
 +
[http://wiki.nikhef.nl/atlas/ITk_Endcap_PP1_PatchPanel PP1 Patch Panel]
 +
 +
'''Plan for QA/QC during 2024'''
 +
 +
-  Tcycle a piece between +40, -35 (or reasonably low) in a dry-air or N2 bag. 
 +
 +
- Measure ohmic R with voltmeter on ~10 places randomly.
 +
 +
- Measure R between all inserts and surface. R<10 Ohm, otherwise we probably need to fix. (or are all inserts grounded anyway via their bolts).
 +
==End-cap structure==
 +
 +
=== Wheel and manifold installation - Positions on ECs and numbering ===
 +
The produced wheels have been installed in the two end-caps as shown in the table. "EC wheel position" refers to the physical level on the EC, where 0 is the top (closest to Interaction Point IP) and 5 is the bottom (furthest from IP). "Erno number" is the identifier that was given at Nikhef to individual wheels. "Dutch-shape number" is the identifier given by the company that milled the locking points. Wheels with Erno number 1 and 14 don't belong to any EC (spare).
 +
 +
The inlet and outlet cooling manifolds are installed in the EC and are referred on the 4th column of the table. The pair inlet-outlet is matched according to their numbers, a.k.a. ''inlet manifold 1A'' and ''outlet manifold 1A'' are placed together, with their VCR connectors at the same location. Cooling manifolds installed close to the beam that has a corner pointing to the right (when EC standing on BH) are identified in the table as "@R beam", while those manifolds close to the beam with the corner pointing left are labeled "@L beam". Manifolds on wheel #0 will be taken away for transport to DESY, so they will have to install them again and if they follow the pattern of the rest of manifolds they will place them so all the As are together and all the Bs as well (not as it is at the moment, June 2024).
 +
[[File:Final EC-A with Beam Left.png|thumb|428x428px|Final EC-A with Left Beam marked with arrow]]
 +
{| class="wikitable"
 +
! rowspan="2" |End-cap wheel
 +
position
 +
! rowspan="2" |Erno
 +
number
 +
! rowspan="2" |Dutch-shape
 +
number
 +
! colspan="2" |Cooling manifolds
 +
|-
 +
!@R beam
 +
!@L beam
 +
|-
 +
|End-cap A - Wheel#0
 +
|11
 +
|19056-13-A7
 +
|0A
 +
|0B
 +
|-
 +
|End-cap A - Wheel#1
 +
|2
 +
|19056-15-B2
 +
|1B
 +
|1A
 +
|-
 +
|End-cap A - Wheel#2
 +
|9
 +
|19056-13-A3
 +
|2B
 +
|2A
 +
|-
 +
|End-cap A - Wheel#3
 +
|13
 +
|19056-15-b6
 +
|3B
 +
|3A
 +
|-
 +
|End-cap A - Wheel#4
 +
|7
 +
|19056-13-A2
 +
|4B
 +
|4A
 +
|-
 +
|End-cap A - Wheel#5
 +
|12
 +
|19056-15-B5
 +
|5B
 +
|5A
 +
|-
 +
| 
 +
| 
 +
| 
 
|
 
|
 
|
 
|
 +
|-
 +
|End-cap C - Wheel#0
 +
|6
 +
|19056-13-A1
 
|
 
|
 
|
 
|
 
|-
 
|-
−
|Disk 5 - D
+
|End-cap C - Wheel#1
 +
|4
 +
|19056-15-B3
 
|
 
|
 
|
 
|
 +
|-
 +
|End-cap C - Wheel#2
 +
|10
 +
|19056-13-A4
 
|
 
|
 
|
 
|
 +
|-
 +
|End-cap C - Wheel#3
 +
|5
 +
|19056-15-B4
 
|
 
|
 
|
 
|
−
|Disk 5 - D
+
|-
−
|✓
+
|End-cap C - Wheel#4
 +
|8
 +
|19056-13-A6
 
|
 
|
 
|
 
|
 +
|-
 +
|End-cap C - Wheel#5
 +
|3
 +
|19056-13-A5
 
|
 
|
 
|
 
|
 +
|}
 +
 +
=== Wheel installation - Distances between wheel rim and lower petals ===
 +
 +
One of the QC tests in a full EC structure consists on checking the actual distances that the locking points leave between the petals and the wheel rims.
 +
 +
 +
 +
[[File:EC-A with Test petal.png|left|frameless|470x470px|EC-A with Test petal]]
 +
 +
[[File:Lower petal-wheel rim distance EC-A.pdf|alt=Lower petal-wheel rim distance EC-A|center|frameless|Lower petal-wheel rim distance EC-A]]
 +
 +
For EC-A, these are the results from the measurements of the '''distance between the wheel rim and the lower petal'''. They are also available in the [https://itkpd-test.unicorncollege.cz/componentView?code=9c7745de9896b5c95f7ccaf804e6730e wheel entries in the ITk Production database].  The purpose was to check if there's enough space for the RF box. The test was done using the measurement petal, and placing it on the lowest locking points. Each measurement was performed next to a spacer rod. Important to take into account that the locking points closer to the inner cylinder might be a bit shorter than the ones on the wheel rim (sometimes the actual height would be probably 0.5mm smaller than measured).   
 +
 
 +
 +
 +
[[File:Lower petal-wheel rim distance EC-C.pdf|thumb|alt=]] 
 +
 +
Due to sensor cracking, one of the potential case scenarios is that the petals will get an extra layer of material, resulting in a larger petal thickness. This could be problematic if there is not enough space between the lower petals and the wheel rims in the already built EC structures (A and C). EC-A was already measured when the RF box issue was addressed, but now EC-C as well.       
 +
 +
[[File:ECs deviations 7mm distance lowerPetal wheelRim.png|thumb|alt=|none|732x732px]]
 +
 +
=== EC geometric measurement - Stiffness ===
 +
A load of a hundred kilograms was placed inside the EC inner cylinder to mimic the operational conditions. Several 3D laser measurements indicated that the EC structures have a high stiffness leading to only 20 to 60 µm effects when loaded.
 +
 +
Test summary presented in the ITk week March 2024: https://indico.cern.ch/event/1353986/contributions/5865828/attachments/2822702/4929833/EC%20GEOMETRIC%20MEASUREMENT%20-%20ATLAS%20ITk%20Week%20180324.pdf
 +
 +
===Characterization of mechanical behaviour EC structure at cold temperatures===
 +
[http://wiki.nikhef.nl/atlas/ITk_Endcap_Structure_TemperatureStudies EC structure temperature studies]
 +
 +
== Petal test box ==
 +
{| class="wikitable mw-collapsible"
 
|}
 
|}
  

Latest revision as of 16:21, 2 October 2024

Back to ITk Endcap Homepage

The construction of the ITk Strip End-caps at Nikhef. Contents author: Andrea García Alonso (aalonso@nikhef.nl)

EC1 structure on 25/05/2023

Wheels

Wheel conduction after assembly

Wheel Conduction

Wheel and Blade production documentation & characterisation

Wheel and Blade production documentation & characterisation

Wheel locking point measurements

Wheel locking point measurements

Wheel QA/QC

Wheel QA/QC

Inner ring measurements

Inner Ring measurements


Stiffening disk

One of the thermal deformation tests on one of the stiffening disks. Picture of 21-01-2022

The stiffening disks of the End-caps, made of Ultem foam with a carbon-fiber face-sheet, were produced and tested at Nikhef. The stiffening disks provide structural stiffness to the EC and act as a thermal barrier. To certify that the three manufactured stiffening disks comply with the specifications, an ATLAS internal note was written to explain the thermal deformation tests carried out at Nikhef, at the end of 2021 and the beginning of 2022. Although it is quite difficult to measure small thermal deformations on such big structures, three tests were performed: temperature changes, local temperature gradients, and global temperature gradients. The results show that the deformations in two disks are consistent with the specifications. The remaining disk is chosen as spare since it deforms above expected, although still mechanically acceptable.


File:ATL-COM-ITK-2022-064.pdf You can find the ATLAS internal note called "Temperature deformation tests of the ITk strip end-cap stiffening disks produced at Nikhef" here: https://cds.cern.ch/record/2824857. In case you don't have access, please contact Andrea García Alonso.

Stiffening Disk


Cooling manifolds

The ITk strip End-cap detector consists of 6 wheels that each accommodate 32 petals. The petals are cooled with a 2-phase CO2 system using cooling service modules that serve 16 petals, corresponding to half a wheel.

Cooling manifold
Status on 1st June 2023:

Disk 0 manifolds fabrication is not finished

All manifolds for disk 1 and disk 2 are fabricated, the As and Bs for disk 3 are fabricated as well. Disk 2, outlet manifolds A, B, C and D are cleaned by 31st May 2023.

Manifolds production status on 06/06/2023
Summer 2023: Pressure tests + leak tests + alcohol flushing

Every manifold is tested at a high pressure (170 bar) and a check for leaks is performed using Helium. Afterwards, every manifold is internally cleaned with alcohol to assure that no small particles could eventually block the capillarities to which the manifold will be connected.

Test reports and status available here:

cernbox.cern.ch/files/spaces/eos/user/m/marcelv/ITK-map/Production/Results/Sub_Assembly/Pressure_test_SA

Status of the inlet and outlet manifolds for EC1 (A-B) and EC2 (C-D)
Inlet

manifold

Produced Preassure

tested

Leak

tested

Alcohol

flushed

Ready for

installation

Outlet

manifold

Produced Preassure

tested

Leak

tested

Alcohol

flushed

Ready for

installation

Disk 0 - A ✓ ✓ ✓ ✓ YES Disk 0 - A ✓ ✓ ✓ ✓ YES
Disk 0 - B ✓ ✓ ✓ ✓ YES Disk 0 - B ✓ ✓ ✓ ✓ YES
Disk 0 - C ✓ ✓ ✓ ✓ YES Disk 0 - C ✓ ✓ ✓ ✓ YES
Disk 0 - D ✓ ✓ ✓ ✓ YES Disk 0 - D ✓ ✓ ✓ ✓ YES
Disk 1 - A ✓ ✓ ✓ ✓ YES Disk 1 - A ✓ ✓ ✓ ✓ YES
Disk 1 - B ✓ ✓ ✓ ✓ YES Disk 1 - B ✓ ✓ ✓ ✓ YES
Disk 1 - C ✓ ✓ ✓ ✓ YES Disk 1 - C ✓ ✓ ✓ ✓ YES
Disk 1 - D ✓ ✓ ✓ ✓ YES Disk 1 - D ✓ ✓ ✓ ✓ YES
Disk 2 - A ✓ ✓ ✓ ✓ YES Disk 2 - A ✓ ✓ ✓ ✓ YES
Disk 2 - B ✓ ✓ ✓ ✓ YES Disk 2 - B ✓ ✓ ✓ ✓ YES
Disk 2 - C ✓ ✓ ✓ ✓ YES Disk 2 - C ✓ ✓ ✓ ✓ YES
Disk 2 - D ✓ ✓ ✓ ✓ YES Disk 2 - D ✓ ✓ ✓ ✓ YES
Disk 3 - A ✓ ✓ ✓ ✓ YES Disk 3 - A ✓ ✓ ✓ ✓ YES
Disk 3 - B ✓ ✓ ✓ ✓ YES Disk 3 - B ✓ ✓ ✓ ✓ YES
Disk 3 - C ✓ ✓ ✓ ✓ YES Disk 3 - C ✓ ✓ ✓ ✓ YES
Disk 3 - D ✓ ✓ ✓ ✓ YES Disk 3 - D ✓ ✓ ✓ ✓ YES
Disk 4 - A ✓ ✓ ✓ ✓ YES Disk 4 - A ✓ ✓ ✓ ✓ YES
Disk 4 - B ✓ ✓ ✓ ✓ YES Disk 4 - B ✓ ✓ ✓ ✓ YES
Disk 4 - C ✓ ✓ ✓ ✓ YES Disk 4 - C ✓ ✓ ✓ ✓ YES
Disk 4 - D ✓ ✓ ✓ ✓ YES Disk 4 - D ✓ ✓ ✓ ✓ YES
Disk 5 - A ✓ ✓ ✓ ✓ YES Disk 5 - A ✓ ✓ ✓ ✓ YES
Disk 5 - B ✓ ✓ ✓ ✓ YES Disk 5 - B ✓ ✓ ✓ ✓ YES
Disk 5 - C ✓ ✓ ✓ ✓ YES Disk 5 - C ✓ ✓ ✓ ✓ YES
Disk 5 - D ✓ ✓ ✓ ✓ YES Disk 5 - D ✓ ✓ ✓ ✓ YES

PP1 patch panel

PP1 Patch Panel

Plan for QA/QC during 2024

-  Tcycle a piece between +40, -35 (or reasonably low) in a dry-air or N2 bag. 

- Measure ohmic R with voltmeter on ~10 places randomly.

- Measure R between all inserts and surface. R<10 Ohm, otherwise we probably need to fix. (or are all inserts grounded anyway via their bolts).

End-cap structure

Wheel and manifold installation - Positions on ECs and numbering

The produced wheels have been installed in the two end-caps as shown in the table. "EC wheel position" refers to the physical level on the EC, where 0 is the top (closest to Interaction Point IP) and 5 is the bottom (furthest from IP). "Erno number" is the identifier that was given at Nikhef to individual wheels. "Dutch-shape number" is the identifier given by the company that milled the locking points. Wheels with Erno number 1 and 14 don't belong to any EC (spare).

The inlet and outlet cooling manifolds are installed in the EC and are referred on the 4th column of the table. The pair inlet-outlet is matched according to their numbers, a.k.a. inlet manifold 1A and outlet manifold 1A are placed together, with their VCR connectors at the same location. Cooling manifolds installed close to the beam that has a corner pointing to the right (when EC standing on BH) are identified in the table as "@R beam", while those manifolds close to the beam with the corner pointing left are labeled "@L beam". Manifolds on wheel #0 will be taken away for transport to DESY, so they will have to install them again and if they follow the pattern of the rest of manifolds they will place them so all the As are together and all the Bs as well (not as it is at the moment, June 2024).

Final EC-A with Left Beam marked with arrow
End-cap wheel

position

Erno

number

Dutch-shape

number

Cooling manifolds
@R beam @L beam
End-cap A - Wheel#0 11 19056-13-A7 0A 0B
End-cap A - Wheel#1 2 19056-15-B2 1B 1A
End-cap A - Wheel#2 9 19056-13-A3 2B 2A
End-cap A - Wheel#3 13 19056-15-b6 3B 3A
End-cap A - Wheel#4 7 19056-13-A2 4B 4A
End-cap A - Wheel#5 12 19056-15-B5 5B 5A
     
End-cap C - Wheel#0 6 19056-13-A1
End-cap C - Wheel#1 4 19056-15-B3
End-cap C - Wheel#2 10 19056-13-A4
End-cap C - Wheel#3 5 19056-15-B4
End-cap C - Wheel#4 8 19056-13-A6
End-cap C - Wheel#5 3 19056-13-A5

Wheel installation - Distances between wheel rim and lower petals

One of the QC tests in a full EC structure consists on checking the actual distances that the locking points leave between the petals and the wheel rims.


EC-A with Test petal

File:Lower petal-wheel rim distance EC-A.pdf

For EC-A, these are the results from the measurements of the distance between the wheel rim and the lower petal. They are also available in the wheel entries in the ITk Production database. The purpose was to check if there's enough space for the RF box. The test was done using the measurement petal, and placing it on the lowest locking points. Each measurement was performed next to a spacer rod. Important to take into account that the locking points closer to the inner cylinder might be a bit shorter than the ones on the wheel rim (sometimes the actual height would be probably 0.5mm smaller than measured).


File:Lower petal-wheel rim distance EC-C.pdf

Due to sensor cracking, one of the potential case scenarios is that the petals will get an extra layer of material, resulting in a larger petal thickness. This could be problematic if there is not enough space between the lower petals and the wheel rims in the already built EC structures (A and C). EC-A was already measured when the RF box issue was addressed, but now EC-C as well.

EC geometric measurement - Stiffness

A load of a hundred kilograms was placed inside the EC inner cylinder to mimic the operational conditions. Several 3D laser measurements indicated that the EC structures have a high stiffness leading to only 20 to 60 µm effects when loaded.

Test summary presented in the ITk week March 2024: https://indico.cern.ch/event/1353986/contributions/5865828/attachments/2822702/4929833/EC%20GEOMETRIC%20MEASUREMENT%20-%20ATLAS%20ITk%20Week%20180324.pdf

Characterization of mechanical behaviour EC structure at cold temperatures

EC structure temperature studies

Petal test box

Cleanroom at Nikhef

Cleanroom

Miscellaneous documents

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