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TECHNICAL SPECIFICATIONS FOR HIGH RRR GRADE NIOBIUM SHEET FOR

USE IN SUPERCONDUCTING RADIO FREQUENCY CAVITIES

ED0371037.RevE

Fermi National Accelerator Laboratory
Applied Physics & Superconducting Technology Division
SRF Measurements & Research Department
P.O. Box 500 - Batavia, Illinois - 60510

TECHNICAL SPECIFICATIONS FOR HIGH RRR GRADE

NIOBIUM SHEET FOR USE IN SUPERCONDUCTING

RADIO FREQUENCY CAVITIES

Fermilab Specification: ED0371037 Rev E

Revision

ER/ECO

Date

Description

Originated By

Approved By

---

ER
#8493

09Aug2006

Original Issue

P. Bauer,
C Antoine

M. Ross

A

ECO
#8736

09Jul2007

Changed RRR Requirement from
250 to 300

L. Cooley

M. Champion

B

ECO
#10250

08Dec2011

Modifications in response to
procurement history

L. Cooley

M. Champion

C

N/A

27Aug2013

Modifications in response to
procurement history

L. Cooley

M. Foley

D

N/A

27Jul2018

Modifications in response to flux
expulsion behavior

S. Posen,
M. Martinello,

S. Chandrasekaran

A. Romanenko

E

N/A

06Mar2020

Added the minimal acceptance
and desired acceptance for PIP-II

S. Chandrasekaran

G Wu

TECHNICAL SPECIFICATIONS FOR HIGH RRR GRADE NIOBIUM SHEET FOR

USE IN SUPERCONDUCTING RADIO FREQUENCY CAVITIES

ED0371037.RevE

1.0 GENERAL

Fermi National Accelerator Laboratory (FNAL, Fermilab) designs and constructs superconducting particle accelerators. This specification addresses superconducting radio-frequency (SRF) cavities, which are a key component of particle accelerators. Performance of these cavities depends on high purity, high RRR, annealed niobium due to its superior superconducting properties. Maintenance of high purity is of utmost concern throughout all steps, since this is the single most important factor affecting end performance. Components are fabricated from plate and rod stock by machining, deep drawing, or other metal-forming processes, for which ductility and formability are important. Components are joined by electron-beam welding to maintain high purity. The RF cavities are tuned to a very precise frequency, and to maintain this tune suitable mechanical strength and tight material tolerances must be maintained. Cavities are operated in a cryogenic vacuum environment, requiring pressure certifications and material traceability. All of these factors motivate the content of this specification.
Of special note, this specification seeks material of a premium grade, for cavities intended to meet performance requirements for the PIP-II Project. Specifications catering to ILC gradient requirements were captured in Rev D of this document.