Exhibit C

SPECIFICATION

BOOSTER GMPS POWER SUPPLY

GIRDER TRIMMING CAPACITOR

Fermi National Accelerator Laboratory
P.O. Box 500
Batavia, IL 60510

SPECIFICATION # 0323–ES–282509

REV B

9/11/2026
Originated by:
Chris Jensen, Spencer Garcia-Schiefelbein

Date

Salah Chaurize

Date

Howie Pfeffer

Date

Ramfis Rivera Colon

Date

Thomas Strauss

Date

Reviewed by:

Reviewed by:

Reviewed by:

Reviewed by:

Booster GMPS Girder Trimming Capacitor

Spec # 0323–ES–282509, Rev. B

INTRODUCTION

This specification is for the capacitors in a White Circuit, a system which provides an offset AC resonant current in the defocusing (D) and focusing (F) Booster’s Combined Function Magnets (CFM) with a minimum of 150 A (700 MeV), a maximum of 1006 A (8.05 GeV) and a period of 50 ms. The choke current is primarily DC. There are 48 of these cells in series driven by a power supply while a coupling loop on the choke maintains equal voltage across the 48 capacitor banks. This system has been in operation for over 50 years. We are purchasing these capacitors to change the circuit’s resonant frequency from 15 Hz to 20 Hz and to match the change of the injection energy from 400 MeV to 800 MeV. The new caps will be housed in the space that presently holds the existing capacitors (Figure 4) which places several restrictions on the physical characteristics of the capacitors. A simplified electrical drawing of an individual cell of the supply is shown in Figure 1. A new value for the capacitor bank is chosen to resonate at slightly lower than 20 Hz but for all 48 cells the same within 1%. LC conducts the DC offset current. This specification is written for trimming capacitors. This trimming capacitor will be added as needed to each bank of capacitors to keep the circuit in resonance. This system runs continuously for 9 months a year. It is also in a neutron and x-ray radiation field which limits the choice of the dielectric materials used for long lifetime. All materials used in this capacitor must be supplied as part of the bid. A different specification will be used for a small number of cells that have special D magnets with higher inductance.

Fig. 1 – A single cell of the Booster Gradient Magnet System

Booster GMPS Girder Trimming Capacitor

Spec # 0323–ES–282509, Rev. B

SCOPE OF WORK

The vendor shall supply the capacitors to satisfy all conditions of this specification. The vendor shall ensure that the capacitors comply with the National Electric Code (NEC) and supply Material Safety Data Sheets on any required materials. The vendor shall supply all QC documents requested from Section 5 and package units for