| Paper | Title | Other Keywords | Page |
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| MOPOGE17 | CST Modeling of the LANSCE Coupled-Cavity Linac | cavity, linac, quadrupole, emittance | 191 |
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| The 800-MeV proton linac at LANSCE consists of a drift-tube linac, which brings the beam to 100 MeV, followed by 44 modules of a coupled-cavity linac (CCL). Each CCL module contains multiple tanks, and it is fed by a single 805-MHz klystron. CCL tanks are multi-cell blocks of identical re-entrant side-coupled cavities, which are followed by drifts with magnetic quadrupole doublets. Bridge couplers - special cavities displaced from the beam axis - electromagnetically couple CCL tanks over such drifts within a module. We have developed 3D CST models of CCL tanks. The models are used to calculate electromagnetic fields in the tanks. Beam dynamics is modelled in CST for bunch trains with realistic beam distributions using the calculated RF fields and quadrupole magnetic fields. Beam dynamics results are crosschecked with other multi-particle codes and applied to evaluate effects of CCL misalignments. | |||
| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-MOPOGE17 | ||
| About • | Received ※ 22 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 02 September 2022 | ||
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| TUPOGE11 | Application of the ASME Boiler and Pressure Vessel Code in the design of SSR Cryomodule Beamlines for PIP-II Project at Fermilab | cavity, solenoid, cryomodule, operation | 507 |
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Funding: Work supported by Fermi Research Alliance, LLC under Contract No. DEAC02- 07CH11359 with the United States Department of Energy, Office of Science, Office of High Energy Physics. This contribution reports the design of the main components used to interconnect SRF cavities and superconducting focusing lenses in the SSR Cryomodule beamlines, developed in the framework of the PIP-II project at Fermilab. The focus of the present contribution is on the design and testing of the edge-welded bellows according to ASME Boiler and Pressure Vessel Code. The activities performed to qualify the bellows to be assembled in cleanroom, for operation in high vacuum, cryogenic environments, and their characterization from magnetic standpoint, will also be presented. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE11 | ||
| About • | Received ※ 22 August 2022 — Revised ※ 24 August 2022 — Accepted ※ 02 September 2022 — Issue date ※ 16 October 2022 | ||
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| TUPOGE12 | Final Design of the Pre-Production SSR2 Cryomodule for PIP-II Project at Fermilab | cryomodule, vacuum, cavity, solenoid | 511 |
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Funding: Work supported by Fermi Research Alliance, LLC under Contract No. DEAC02- 07CH11359 with the United States Department of Energy, Office of Science, Office of High Energy Physics. The present contribution reports the design of the pre-production Single Spoke Resonator Type 2 Cryomodule (ppSSR2 CM), developed in the framework of the PIP-II project at Fermilab. The innovative design is based on a structure, the strongback, which supports the coldmass from the bottom, stays at room temperature during operations, and can slide longitudinally with respect to the vacuum vessel. The Fermilab style cryomodule developed for the prototype Single Spoke Resonator Type 1 (pSSR1) and the prototype High Beta 650 MHz (pHB650) cryomodules is the baseline of the current design, which paves the way for production SSR1 and SSR2 cryomodules for the PIP-II linac. The focus of this contribution is on the results of calculations and finite element analysis performed to optimize the critical components of the cryomodule: vacuum vessel, strongback, thermal shield, and magnetic shield. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-TUPOGE12 | ||
| About • | Received ※ 24 August 2022 — Revised ※ 26 August 2022 — Accepted ※ 30 August 2022 — Issue date ※ 02 September 2022 | ||
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| THPOJO11 | Wakefield Monitor System for X-Band Lineariser Linac on CLARA | HOM, linac, controls, wakefield | 718 |
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Funding: STFC-UKRI CLARA linear accelerator in phase-2 will utilise an X-band fourth harmonic linac to linearise bunch phase space. Beam induced transverse higher order modes (HOMs) between 15.3 to 16.2GHz will be coupled out through HOM ports, which can be used to correct both position offset and angle misalignment to minimise beam degradation due to HOMs. In this paper we present design of a wakefield monitor system under development, with capability to use either baseband broadband signal for basic alignment, and also carry a detailed narrow-band spectrum analysis on all four (X and Y transverse modes from two couplers) signals. Initial laboratory testing of its subsystem is also presented. |
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| DOI • | reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOJO11 | ||
| About • | Received ※ 22 August 2022 — Accepted ※ 01 September 2022 — Issue date ※ 08 September 2022 | ||
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