Attachment C -Technical Specification Doc No. EIC-ISG-SPC-012 Rev 01.pdf

Electron-Ion Collider, Brookhaven National Laboratory

Doc No. EIC-ISG-SPC-012 Author: M. Paniccia Effective Date: November 15, 2023 Review Frequency: N/A

Specification Title: EIC HSR BPM Cryo-Cable Assembly Revision: 01

TECHNICAL SPECIFICATION

for the

EIC HSR BPM Cryo-Cable Assembly Quality Classification: A-3

Prepared By:

__________________________________________ Date: __________________ Matthew Paniccia, C-AD Instrumentation Engineer Electron-Ion Collider Brookhaven National Laboratory

Reviewed By:

Joseph Tuozzolo, Technical Division Group Leader Electron-Ion Collider

David Gassner, EIC Instrumentation Group Leader

Frederic Micolon, EIC Mechanical Engineer

Charlie Hetzel, EIC Vacuum Group Leader

DocuSign Envelope ID: B359AED3-17CA-446C-AB05-9B1B833E02D1

11/15/2023

11/15/2023

11/15/2023

Ed Cheswick, Quality Assurance

Chuck Schaefer, ESH

Cindy Galdamez, Procurement Liaison Engineer

Approved By:

Vadim Ptitsyn, HSR L2 Manager

11/15/2023

REVISION HISTORY

Revision # Effective Date Summary of Change

00 9/29/2023 Initial Release

01 11/15/2023

Minor clarifications in Table 1. Changed VSWR from 1.2:1 to 1.3:1. Changed minimum bend radius from 0.4 inch to

0.5 inch. Separated out Cable-to-cable insertion loss comments from the 3.1.1.1 Voltage Standing Wave Ratio (VSWR) section, and put them into their own new section

3.1.1.2.

Table of Contents

1 SCOPE

2 APPLICABLE DOCUMENTS

3 REQUIREMENTS

4 VERIFICATION

LIST OF ACRONYMS

ABL As-Built Listing ATP Acceptance Test Procedure BNL Brookhaven National Laboratory BPM Beam Position Monitor BSA Brookhaven Science Associates EIC Electron-Ion Collider ESH Environment, Safety and Health HSR Hadron Storage Ring SOW Statement of Work UHV Ultra-High Vacuum VSWR Voltage Standing Wave Ratio

1 SCOPE

This specification defines the technical requirements for the Hadron Storage Ring (HSR) Beam Position Monitor (BPM) Cryo-Cable Assembly to be used at the Electron-Ion Collider (EIC) at Brookhaven National Laboratory (BNL) managed by Brookhaven Science Associates (BSA).

1.1 Background

The EIC Project will design, build, and install the accelerator hardware for a new electron storage ring, a new electron accelerator synchrotron ring with an electron injector, and modifications to the hadron ring required to produce an electron ion collider and associated infrastructure. It will include one interaction region with a complete detector. The EIC is being designed to reserve space for a second interaction region with a second detector. The facility is designed to meet requirements to ensure high reliability and availability for the user program.

The HSR BPM Cryo-Cable Assemblies (Cable Assemblies hereafter) will be procured by BSA for installation in the HSR of the EIC. The Cable Assemblies will be used to carry beam position monitor radio frequency electrical signals through the cryostat insulating vacuum, from the liquid helium cooled cryogenic BPM feedthrough to the room temperature insulating vacuum to air feedthrough.

2 APPLICABLE DOCUMENTS

The following specifications, standards and drawings form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of these documents shall be that in effect on the date of the solicitation or contract. Exceptions must be approved in writing by BSA.

In the event of a conflict between the applicable documents and this specification, the Contractor shall immediately notify the BSA Contractual Representative who shall in each instance determine which document takes precedence and advise the Contractor accordingly. Failure to notify BSA of a document conflict shall not relieve the Contractor’s responsibility to ensure full compliance to all requirements.

Document Number Document Title

2551M0002 Hadron Storage Ring, Beam Instrumentation, BPM Coaxial Cables, SiO2

MIL-PRF-39012

MIL-STD-348 Specifications for SMA Male Connectors

MIL-DTL-17 Specification for Semi-Rigid Coaxial Cable

29 CFR 1910.1200 Hazard communication & materials

3 REQUIREMENTS

3.1 Technical/Performance Characteristics

Table 1: Technical Specifications for cryo-cable assemblies Quality Specification Tolerance

Connector 1 and 2 SMA-male1,2,3,4 (see notes below) Dimensional per

MIL-STD-348

Minimum bend radius 0.5 inch N/A

Characteristic impedance 50 Ohm +/- 1 Ohm +/- 2%

Velocity of propagation N/A +/- 1% over lot Cable-cable insertion loss variation

+/-0.05 dB from 20 MHz to 3 GHz.

VSWR 1.3:1 from 20 MHz through 3 GHz N/A Length (including connectors)

Approximately 54 inches. See drawing 2551M0002 for details. +/- 0.25 inches

Outer jacket material Non-magnetic stainless steel (304 or equivalent) N/A

Outer conductor material Seamless Copper C10100 N/A Outer conductor coating thickness

Thickness and tolerance must be specified. A thinner coating is preferred whenever possible.

Inner conductor material Copper C10100 N/A Dielectric material Low density, high purity silicon dioxide N/A Outside diameter 0.090 inches or 0.141 inches N/A EMI Shielding >110 dB N/A

1 SMA-male connector do not require sealing gasket 2 SMA-male center pin to be gold plated (nickel strike acceptable) 3 Hex nut shall have locking wire holes 4 Connectors shall be vented

3.1.1 Electrical Requirements

Electrical performance shall be in accordance with the applicable portions of MIL-C-17/130, Specification for the Semi-Rigid Coaxial Cable. For the electrical performance of the SMA Male Connectors, refer to MIL-PRF-39012.

3.1.1.1 Voltage Standing Wave Ratio (VSWR) - Because of the 50 Ohm characteristic impedance of the signal cables, it will be necessary for each Cable Assembly to have 50 Ohm impedance. The degree of impedance mismatch shall be quantified by the voltage standing wave ratio (VSWR). The VSWR shall be less than 1.3:1 from 20 MHz through 3 GHz.

3.1.1.2 Cable-to-cable Insertion Loss - Variations in cable-to-cable insertion loss between different Cable Assemblies shall be less than +/-0.05 dB from 20 MHz to 3 GHz.

3.1.1.3 Delay Matching Requirement - Cable assemblies are delay matched within +/- 25 ps to a physical standard, 0.3 - 3 GHz.

3.1.1.4 Environment – The Cable Assembly shall have an operating range of 4.5 K to room temperature.

3.1.2 Mechanical Requirements

Mechanical configuration shall be in accordance with BNL drawing 2551M0002.

3.1.3 Vacuum Requirements

3.1.3.1 Ultra High Vacuum Environment – The Cable Assembly will be used in an insulating vacuum environment. The coaxial cable and SMA connectors will be exposed to the insulating vacuum (10-9 - 10-4 Torr). All design details, fabrication techniques, and materials shall be in accordance with this application. All surfaces of each cable shall be smooth and free of scale, stains and residues of any kind upon receipt by BNL.

3.1.3.2 Bake-out – The Cable Assembly shall be capable of baking to 150°C without developing leaks and without degradation of its electrical performance. All design details and materials shall be consistent with this application.

3.1.3.3 Leak Rate – The Cable Assembly shall have a leak rate of less than 1×10-8 std. cc/sec He when tested with a helium mass spectrometer leak detector over the full operating temperature range (cryogenic temperature to 150°C). All leak checking shall be carried out in an UHV-compatible clean environment using oil-free pumps.

3.1.3.4 Vented connectors – All cavities within a connector and/or a connector body shall be vented. Venting holes design shall not jeopardize the electrical performance of the connector.

3.1.3.5 Cleaning and Handling – During and after fabrication, all components shall be cleaned, free of hydrocarbon contaminants, and handled in accordance with their intended use in UHV systems. The Cable Assemblies as received shall exhibit no traces of halocarbons, oils or other contaminants with atomic mass of 35 or greater than 40 amu with the exception of 44 when tested using a residual gas analyzer with a minimum detectable partial pressure of 1x10-11 torr N2. The predominant gas component shall be hydrogen and be at least 60% of the total pressure after being pumped for 100 hours. The sum of partial pressures of atomic mass 35 and 40 thru 100 excluding atomic mass 44, shall be less than 1% of the total pressure of the system.

3.2 Materials

3.2.1 Hazardous Materials - Materials which may be defined as hazardous in accordance with 29 CFR 1910.1200, Hazard Communication shall not be used.

3.2.2 Materials – Written material certification shall be provided for each of the following materials.

• Cable Assembly – The material to be used for the Cable Assembly shall be as indicated in

Table 1.

• Dielectric – The dielectric material used to electrically isolate the center conductor from the outer cable conductor shall be low density, high purity Si02.

3.3 Code/Standard Compliance

3.3.1 SMA Connector – The SMA male connector shall be in accordance with the applicable portions of MIL-PRF-39012 and MIL-STD-348, Specification for SMA Male Connectors.

3.3.2 Coaxial Cable – The semi-rigid coaxial cable shall be in accordance with the applicable portions of MIL-DTL-17, Specification for Semi-Rigid Coaxial Cable.

3.4 Marking and Serialization

3.4.1 Serial Numbers – Each Cable Assembly shall be assigned a unique serial number by the Contractor. The serial number shall be marked on the Cable Assembly outer conductor surface by the Contractor.

3.4.2 Part Numbers – Each Cable Assembly shall be assigned BSA’s part number, as specified on the corresponding drawing. The part number and revision letter shall be marked on the Cable Assembly by the Contractor.

3.5 Packaging/Shipping

Each set of Cable Assemblies shall be wrapped in lint-free paper or vacuum-grade aluminum foil and put into clean transparent polyethylene bags back-filled with clean, dry nitrogen.

Each bagged assembly shall be individually packaged in a way to ensure protection during the shipping process. The Cable Assemblies shall be shipped to BNL in boxes which are durable enough to facilitate subsequent storage at BNL after completion of incoming inspection. Plastic “peanuts” or other such loose packing material shall not be used by the Contractor in the packaging of the Cable Assemblies.

4 VERIFICATION

Appropriate inspection/tests shall be performed to ensure unit conforms to all requirements in section 3 of this specification.

4.1 Classification of inspections

Items covered by this specification shall be subjected to the following tests to determine compliance with all applicable requirements:

4.1.1. Pre-production Tests (of pre-production units)

Compliance with the specification shall be verified using the Acceptance Test Procedure (ATP) generated by the Contractor and approved by BSA in writing. Testing and inspection shall be conducted at the Contractor’s facility. The Contractor shall not commence fabrication of the production units until receiving notification of pre-production unit acceptance and authorization in writing from BSA.

4.1.2. Acceptance Tests

4.1.2.1 Acceptance Tests Performed at Contractor - The Contractor shall provide ATPs for BNL written approval that are in accordance with this specification and all reference documents noted herein. Each Cable Assembly shall be tested at the Contractor’s facility to demonstrate compliance with the requirements specified in section 3.1. All data shall be documented and delivered to BSA for review prior to acceptance. In addition, the following tests shall be conducted on each Cable Assembly at the Contractor’s facility according to the ATPs, prior to delivery to

BNL:

• Dimensional Measurement – The overall length and bends of the Cable Assemblies shall be measured for conformance to the drawing requirements.

• Electrical Measurements – Network analyzer trace data with S11 vector terminated with 50 ohm load from 100 KHz to 3 GHz, and trace data with S21 vector from 100 KHz to 3 GHz shall be provided.

• Cleanliness – The Cable Assemblies shall be inspected for cleanliness and free of hydrocarbon contaminants.

• Leak checking - Shall be performed at room temperature in accordance with this specification.

4.1.2.2 Acceptance Tests Performed at BNL - In addition to the acceptance tests performed at the Contractor’s facility, the Cable Assemblies will be acceptance tested at BNL. Any Cable Assemblies that fail to pass these tests shall be returned to the Contractor for analysis and corrective action. The Contractor is responsible for incorporating any configuration changes if it is determined that the failure is caused by a design or manufacturing flaw. The Contractor’s responsibility includes shipping, labor, and materials.

• Electrical Measurements – Verify conformance to specification listed in 3.1.1.

Measurements shall be made at room temperature and at cryogenic temperature. Network analyzer S11 measurements with vector terminated with 50 Ohm load from 100 KHz to 3 GHz, and measurements with S21 vector from 100 KHz to 3 GHz.

• Mechanical tests – Cable Assembly will be thermal cycled multiple times (~10) from room temperature to cryogenic temperature.

• Dimensional Measurements – Overall length measurement and bends of the Cable Assembly shall be performed as required to ensure conformance to the drawings. The inspection shall be in accordance with BNL drawing 2551M0002.

• Leak Checking - Leak checking shall be performed in accordance with this specification as described in section 3.1.3.3 at room temperature and at cryo temperature (< 80 K).

• UHV Cleanliness - With the cable assembly remaining under vacuum in the leak checking apparatus following the helium leak test a 0-100 AMU residual gas analyzer spectrum analysis will be performed to verify UHV cleanliness per paragraph 3.1.3.5 herein.