ITk Endcap At Nikhef

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The construction of the ITk Strip End-caps is done at Nikhef. On this page, you will find the information related to that process.

EC1 structure on 25/05/2023

Author: Andrea García Alonso

Wheel production

Wheel conduction after assembly

Wheel Conduction

Wheel and Blade production documentation & characterisation

Wheel locking point measurements

Wheel QA/QC

Inner ring measurements

Inner Ring measurements

End-cap structure

- Characterization of mechanical behaviour EC structure at cold temperatures

EC structure temperature studies

- Stiffener disk measurements

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 here: https://cds.cern.ch/record/2824857?. In case you don't have access, please contact Andrea García Alonso.

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

Stiffener Disk

- PP1 patch panel

PP1 Patch Panel

- 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

Working schedule of Pranati and Ali:

- Thursday 15th: first pair of inlet manifolds, aka disk 2 inlet manifolds A and B. Then all EC1 disk 2 manifolds would be ready. And change to disk 1 inlet manifolds A and B.

- Friday 16th: move on to disk 1 outlet manifolds A and B. Then all EC1 disk 1 manifolds would be ready. And continue with disk 3 outlet manifolds A and B.

- Thursday 22nd: finish with disk 3: disk 3 inlet manifolds A and B. Then all EC1 disk 3 manifolds would be ready.

- Monday 26th: if previous days' objectives were not achieved, day to wrap things up (or do more A-B manifolds if they get ready by then). Also, Andrea García starts the pressure tests with disk 1 inlet manifolds.

In July, Osama continues with the manifolds of EC2.

Status of the inlet and outlet manifolds for EC1 (A-B) and EC2 (C-D)
Outlet Manifold	Fabricated	Alcohol flushing cleaning	Inlet manifold	Fabricated
Disk 0 - A			Disk 0 - A
Disk 0 - B			Disk 0 - B
Disk 0 - C			Disk 0 - C
Disk 0 - D			Disk 0 - D
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	DONE - 25/05/2023	Disk 2 - A	YES
Disk 2 - B	YES	DONE - 25/05/2023	Disk 2 - B	YES
Disk 2 - C	YES	DONE - 31/05/2023	Disk 2 - C	YES
Disk 2 - D	YES	DONE - 31/05/2023	Disk 2 - D	YES
Disk 3 - A	YES		Disk 3 - A	YES
Disk 3 - B	YES		Disk 3 - B	YES
Disk 3 - C			Disk 3 - C
Disk 3 - D			Disk 3 - D
Disk 4 - A			Disk 4 - A
Disk 4 - B			Disk 4 - B
Disk 4 - C			Disk 4 - C
Disk 4 - D			Disk 4 - D
Disk 5 - A			Disk 5 - A
Disk 5 - B			Disk 5 - B
Disk 5 - C			Disk 5 - C
Disk 5 - D			Disk 5 - D

Cleanroom at Nikhef

Cleanroom

Miscellaneous documents

Click here for the request regarding temporary connectors (pdf).
ITk pictures by Jesse van Dongen
EC mockup fb2020