Attachment C - Tech Spec for the Scintillating Fibers for the Barrel Imaging Calorimetor Rev04.pdf

Electron-Ion Collider, Brookhaven National Laboratory

Doc No. EIC-DET-SPC-017 Author: Alexander Bazilevsky Effective Date: December 3, 2024 Review Frequency: N/A

Specification Title: Technical Specification for the Scintillating Fibers for the Barrel Imaging Calorimeter Revision: 04

TECHNICAL SPECIFICATION

for the Scintillating Fibers for the Barrel Imaging Calorimeter Quality Classification: A-3

Prepared By:

_________________________________ Date: __________________ Alexander Bazilevsky, CAM

Zisis Papandreou, DSC

Reviewed By:

Joseph Zipper, Quality Representative

Marcel Romero, Procurement Liaison Engineer

Chuck Schaefer, ESH Manager

Approved By:

Elke Aschenauer, Level 2 Manager

Docusign Envelope ID: 4E6E5F1B-CC86-4547-95D6-662B1C582B89

12/3/2024

12/4/2024

12/4/2024

12/4/2024

12/4/2024

12/4/2024

Doc No. EIC-DET-SPC-017 Author: Alexander Bazilevsky Effective Date: December 3, 2024 Review Frequency: N/A

Specification Title: Technical Specification for the Scintillating Fibers for the Barrel Imaging Calorimeter Revision: 04

This page intentionally left blank, to accommodate back-to-back printing.

Doc No. EIC-DET-SPC-017 Author: Alexander Bazilevsky Effective Date: December 3, 2024 Review Frequency: N/A

Specification Title: Technical Specification for the Scintillating Fibers for the Barrel Imaging Calorimeter Revision: 04

REVISION HISTORY

Revision # Effective Date Summary of Change

00 2/6/2024 Initial Release

01 4/30/2024 Removal of first article testing and addition of pre-production testing.

02 6/27/2024 Added Section 3.2 to include a request for additional options regarding increased light yield and adjusted total length.

03 9/4/2024 Removal of pre-production testing.

04 12/3/2024 Revisions per BHSO comments.

Doc No. EIC-DET-SPC-017 Author: Alexander Bazilevsky Effective Date: December 3, 2024 Review Frequency: N/A

Specification Title: Technical Specification for the Scintillating Fibers for the Barrel Imaging Calorimeter Revision: 04

TABLE OF CONTENTS

1 BACKGROUND

1.1 Background

2 APPLICABLE DOCUMENTS

3 REQUIREMENTS

3.1 Technical/Performance Characteristics

3.2 Higher Light Yield and Higher Attenuation Length Options

3.3 Environment, Safety and Health

4 VERIFICATION

Doc No. EIC-DET-SPC-017 Author: Alexander Bazilevsky Effective Date: December 3, 2024 Review Frequency: N/A

Specification Title: Technical Specification for the Scintillating Fibers for the Barrel Imaging Calorimeter Revision: 04

LIST OF ACRONYMS

BIC Barrel electromagnetic Imaging Calorimeter BNL Brookhaven National Laboratory BSA Brookhaven Science Associates CAM Control Account Manager DSC Detector Subsystem Leader EIC Electron-Ion Collider ESH Environment, Safety and Health RMS Root Mean Square

Doc No. EIC-DET-SPC-017 Author: Alexander Bazilevsky Effective Date: December 3, 2024 Review Frequency: N/A

Specification Title: Technical Specification for the Scintillating Fibers for the Barrel Imaging Calorimeter Revision: 04

Technical Specification for the Scintillating Fibers for the Barrel Imaging Calorimeter

1 BACKGROUND

The Electron-Ion Collider (EIC) is a Nuclear Physics facility being built at the United States (U.S).

Department of Energy’s (DOE) Brookhaven National Laboratory (BNL). The EIC will create intense beams of relativistic energy electrons and ions in opposing particle storage rings that will be brought into collision in a large experimental detector. This will provide insight into the internal structure of protons and neutrons and the gluelike force that holds them together.

1.1 Background

The EIC Project includes one interaction region, with an allowance for a second, and one detector. The EIC detector is being designed as a hermetic, general-purpose detector. It will be an approximately 10-meter-long cylindrical barrel detector with additional instrumentation that extends to up to 45m in each direction down the EIC beamline. It will use cutting-edge technologies to detect particles created in collisions between high energy electrons and protons or heavy ions (the nuclei of larger atoms) moving close to the speed of light. It will be based on a 1.7 Tesla superconducting magnet for curving the trajectories of charged particles created in these collisions and will include high precision tracking and particle identification systems to measure and identify charged particles, electromagnetic calorimeters to measure and identify electromagnetic particles, and hadronic calorimeters to allow for high precision jet (a collimated spray of particles) measurements.

Scintillating fibers are one of the components of the Barrel Imaging electromagnetic Calorimeter (BIC), one of the subsystems of the EIC detector. They will be glued to corrugated lead sheets (absorber) and will serve to convert the energy of the secondary particles generated in the absorber into light, subsequently detected by photo sensors.

2 APPLICABLE DOCUMENTS

None.

Doc No. EIC-DET-SPC-017 Author: Alexander Bazilevsky Effective Date: December 3, 2024 Review Frequency: N/A

Specification Title: Technical Specification for the Scintillating Fibers for the Barrel Imaging Calorimeter Revision: 04

3 REQUIREMENTS

3.1 Technical/Performance Characteristics

A. Light yield: the average response to a Sr-90 source shall be greater than 3.5 photoelectrons measured using a bialkali photomultiplier tube (e.g. Hamamatsu R329-02 or similar) 200 cm from the source, and the opposite end blackened (or assessed via other methods mutually acceptable to the BSA and Contractor).

B. Diameter mean value and variation shall be 1.00 +/- 0.01 mm, RMS ≤0.02 mm.

C. Attenuation length for blue light > 4m.

D. Batch to batch or lot to lot variation of light yield <15%.

E. Batch to batch or lot to lot variation of attenuation length <10%.

F. Emission spectrum in blue-green light G. Scintillation decay time <3ns H. Total length 4900 km I. Delivery method in canes. Length of fibers 4.55 meters +/- 0.01m.

3.2 Higher Light Yield and Higher Attenuation Length Options

With the fiber mechanical properties being within the requirements, the performance of the barrel calorimeter is majorly defined by Light Yield and light Attenuation Length with minimally accepted requirements defined in section 3.1. It is strongly preferred to utilize fibers with higher Light Yield and longer Attenuation Length, which may require more advanced production technologies (e.g. multi-clad technology) and consequently may result in higher cost. The Contractor is encouraged to offer more than one fiber options, with the list of specifications for each option.

3.3 Environment, Safety and Health

Identification of hazards, and their mitigation, during all stages of the life of the Equipment including; installation, commissioning, operation, maintenance, and repair. Identification of means to eliminate or manage each hazard shall be provided based on the following hierarchy:

• Eliminate the hazard, or

• Substitute with something less hazardous, or

• Engineer – mitigate the severity of the hazard, or

• User Personal Protective Equipment (least desirable).

Doc No. EIC-DET-SPC-017 Author: Alexander Bazilevsky Effective Date: December 3, 2024 Review Frequency: N/A

Specification Title: Technical Specification for the Scintillating Fibers for the Barrel Imaging Calorimeter Revision: 04

4 VERIFICATION

Appropriate inspection/tests shall be performed to ensure fibers conform to all requirements in section 3 of this specification. As a practical matter, the light output will be determined in comparison to average light yield of a set of "standard reference fibers" with an agreed upon light yield to which all subsequent production batches will be compared. BSA will measure the absolute photon yield (section 3.1) to verify that the standard reference fibers meet the specification for absolute light yield.

4 VERIFICATION