PIP 2 IT 650 MHz RF Distribution Preliminary

PIP 2 IT 650 MHz RF Distribution Preliminary Design Review Introduction In partnership with: Jim Steimel PIP 2 IT 650 MHz RF Distribution PDR May 28, 2020 India/DAE Italy/INFN UK/STFC France/CEA/Irfu, CNRS/IN 2 P 3 Poland, WUST

Introduction & Agenda • The purpose of this review is to examine the documentation associated with the design of the PIP 2 IT 650 MHz RF Distribution. • This talk will describe the scope of the distribution design and the document organization. • It will also discuss some of the more complicated issues associated with the scheduling and implementation. 2 2/11/2022

Scope • The RF distribution for PIP-II systems connects the RF amplifier to the input coupler of a resonant cavity. • It includes all necessary components in the path including isolators/circulators, directional couplers, transmission line bellows, and adapters. 3 RF Distribution System Amplifier cavity Cryomodule 2/11/2022

Requirements Flow. Down - Technical Master ICD ISD 650 MHz Distribution FRS – Functional Requirements Spec ICD – Interface Control Doc ISD – Interface Spec Doc TRS – Technical Requirements Spec ISD 650 MHz Amplifier FRS 650 MHz Distribution TRS 650 MHz Amplifier 4 2/11/2022

Key Assumptions • PIP 2 IT will transform into a test facility for PIP-II cryomodules once the beam tests have concluded. • The PIP 2 IT enclosure will have sufficient space and resources to test one 650 MHz and one 325 MHz cryomodule simultaneously. It will not have space for testing multiple 650 MHz cryomodules. • The RF amplifiers, controls, and interlocks will be interchangeable when testing HB 650 and LB 650 cryomodules. • LB 650 cyromodules have fewer cavities (4 vs. 6) and require less power than HB 650 cryomodules. Design is focused on serving HB 650 cryomodule testing. • We will only have one amplifier for testing the first HB 650 cryomodule. 5 2/11/2022

Power Requirements • Functional requirements specify testing cavities up to 10% over specified average cavity gradient. • Power required calculation includes average cavity gradient, effective length, and peak microphonics (20 Hz). • Nominal coupling defined by SRF but estimates allow for up to 25% variation in setting. • These factors lead to a peak power at coupler to test HB 650 cavities of 30. 1 k. W. • If we assume losses of less than 0. 5 d. B through the transmission line, power requirement is 34 k. W. • This power level is within the range of the LB 650 power amplifier. • Circulator specification must be for 70 k. W due to high reflected power from cavity decay. 6 2/11/2022

Single Amplifier Operation • For first cryomodule, schedule only allows for one amplifier on hand for testing first HB 650 cryomodule. • Plan is to have one path to bring distribution through a penetration. • Extensions to different cavities will be placed close to cryomodules. • Will require at least three, extra, removable transmission line pieces. 7 2/11/2022