Explanipedia

CLIC readiness report Open

E. Adli, G. D’Auria, Nuria Catalán Lasheras, S. Doebert, Michael Draper , et al. · 2025

The Compact Linear Collider (CLIC) is a TeV-scale high-luminosity linear e + e − collider studied by the international CLIC and CLICdp collaborations hosted by CERN. CLIC uses a two-beam acceleration scheme, in which normal-conducting high…

Method to Evaluate Steering and Algnment Algorithms for Controlling Emittance Growth Open

C. Adolphsen · 2024

Measurements of Longitudinal Phase Space in the SLC Linac Open

K. Bane, C. Adolphsen, T. L. Lavine, Marc Ross, J. Seeman , et al. · 2023

In the Stanford Linear Collider the beam leaves a damping ring and then enters the Ring-to-Linac (RTL) transfer line. In the RTL it is compressed in length by a factor of 10 by means of an rf section, with which a longitudinally correlated…

Overview of CW electron guns and LCLS-II RF gun performance Open

Feng Zhou, C. Adolphsen, D.H. Dowell, Rong Xiang · 2023

Various continuous-wave (CW) electron gun technologies are reviewed, including DC, superconducting radio frequency RF (SRF), hybrid DC-SRF and normal-conducting RF. Also, the SLAC Linac Coherent Light Source II (LCLS-II) normal-conducting …

Design of an Emittance Compensation Superconducting Magnet Package for LCLS-II-HE's SRF Photo-Injector Open

Xiaoji Du, C. Adolphsen, Yoon Hyuck Choi, David Greene, John Lewellen , et al. · 2023

An SRF photo-injector (low frequency, quarter-wave resonator plus emittance compensation magnet) is planned for LCLS-II-HE as it can provide a higher cathode gradient and better electron beam quality than other types of CW electron guns. T…

The Development of Energy-Recovery Linacs Open

C. Adolphsen, Kévin André, D. Angal-Kalinin, Michaela Arnold, Kurt Aulenbacher , et al. · 2022

Energy-recovery linacs (ERLs) have been emphasised by the recent (2020) update of the European Strategy for Particle Physics as one of the most promising technologies for the accelerator base of future high-energy physics. The current pape…

High gradient performance and quench behavior of a verification cryomodule for a high energy continuous wave linear accelerator Open

Sam Posen, A. Cravatta, M. Checchin, Sebastian Aderhold, C. Adolphsen , et al. · 2022

An 8-cavity, 1.3 GHz, LCLS-II-HE cryomodule was assembled and tested at Fermilab to verify performance before the start of production. Its cavities were processed with a novel nitrogen doping treatment to improve gradient performance. The …

TRANSVERSE WAKE FIELD CONTROL AND FEEDBACK IN THE SLC LINAC. Open

J.T. Seeman, I.E. Campisi, W.B. Herrmannsfeldt, M. Lee, A. Petersen , et al. · 2022

Transverse wakefields in the linac of the SLAC Linear Collider (SLC) have been observed to enlarge the effective emittance of beams which are not properly centered in the accelerating structure.‘~2 A fast feedback system has been construct…

EXPERIMENTAL BEAM DYNAMICS IN THE SLC LINAC. Open

J.T. Seeman, G. S. Abrams, C. Adolphsen, I.E. Campisi, W.B. Herrmannsfeldt , et al. · 2022

1. Abstract The component installation for the upgrade of the threekilometer linac’ for the SLAC Linear Collider (SLC) was completed in late summer 1986. The system status and measurements of beam properties made during commissioning are d…

LCLS-II-HE verification cryomodule high gradient performance and quench behavior Open

Sam Posen, A. Cravatta, Mattia Checchin, Sebastian Aderhold, C. Adolphsen , et al. · 2021

An 8-cavity, 1.3 GHz, LCLS-II-HE cryomodule was assembled and tested at Fermilab to verify performance before the start of production. Its cavities were processed with a novel nitrogen doping treatment to improve gradient performance. The …

Commissioning of the SLAC Linac Coherent Light Source II electron source Open

Feng Zhou, C. Adolphsen, Andrew Benwell, Garth Brown, D. H. Dowell , et al. · 2021

For the Linac Coherent Light Source II (LCLS-II) project at SLAC, a 1.3 GHz superconducting rf (SRF) linac is being constructed that will generate 4 GeV electron bunches at a high repetition rate to drive x-ray free electron lasers. The LC…

Spare Gun Multi-Physics Analysis for LCLS-II Open

Liling Xiao, C. Adolphsen, Antonio Cedillo, E. Jongewaard, Xianghong Liu , et al. · 2021

LBNL APEX VHF normal conducting gun was adopted for LCLS-II CW operation to provide ultra-bright high repetition rate X-ray pulses. The initial LCLS-II gun and injector commissioning showed excessive dark current dominated by field emissio…

Multienergy operation analysis in a superconducting linac based on off-frequency detune method Open

Zhen Zhang, Yuantao Ding, C. Adolphsen, T. Raubenheimer · 2019

The free-electron laser facilities driven by a superconducting radio-frequency (SRF) linac provide high-repetition-rate electron beam, which makes it feasible to feed multiple undulator lines at the same time. In this paper, we study a met…

Analytical study of superconducting RF cavity detuning compensation Open

Faya Wang, C. Adolphsen · 2019

The cavities in superconducting linacs tend to operate with narrow bandwidths that are comparable to microphonic induced detuning from external forces. Proportional-Integral (PI) feedback loops are used to stabilize the cavity voltage in r…

Multi-Energy Operation Analysis in a Superconducting Linac Based on off-Frequency Detune Method Open

Zhen Zhang, C. Adolphsen, Yuantao Ding, T. Raubenheimer · 2019

The free-electron laser facilities driven by a superconducting radio-frequency (SRF) linac provide high-repetition-rate electron beam, which makes it feasible to feed multiple undulator lines at the same time. In this paper, we study a met…

RF Incoming Inspection of 1.3 GHz Cryomodules for LCLS-II at SLAC National Accelerator Laboratory Open

Sebastian Aderhold, C. Adolphsen, A. Burrill, Daniel Gonnella, J. Nelson · 2019

The main part of the SRF linac for the Linac Coherent Light Source II (LCLS-II) at SLAC National Accelerator Laboratory will consist of 35 cryomodules with superconducting RF cavities operating at 1.3 GHz. The cryomodules are assembled and…

Initial Operation of the LCLS-II Electron Source Open

C. Adolphsen, Andrew Benwell, Garth Brown, M. Dunning, S. Gilevich , et al. · 2019

The Early Injector Commissioning program for LCLS-II aims to demonstrate CW electron beam production this year in the first two meters of the injector that includes the room-temperature 185.7 MHz single-cell gun and the 1.3 GHz two-cell bu…

First Commissioning of LCLS-II CW Injector Source Open

Feng Zhou, C. Adolphsen, Andrew Benwell, Garth Brown, William Colocho , et al. · 2019

The LCLS-II injector source includes a 186MHz CW rf-gun, a 1.3 GHz CW rf-buncher, a loadlock system for photocathode change, two main solenoids, and a few essential diagnostics. The electron beam is designed to operate at a high repetition…

Microphonic detuning induced coupler kick variation at LCLS-II Open

Thorsten Hellert, Wolfgang Ackermann, C. Adolphsen, Herbert De Gersem, Zenghai Li , et al. · 2018

The LCLS-II free-electron laser will be an upgrade of the existing Linac Coherent Light Source (LCLS), including a 4GeV CW superconducting linac based on the TESLA technology. The high quality factor of the cavity makes it very sensitive t…

3D multiphysics modeling of superconducting cavities with a massively parallel simulation suite Open

O. Kononenko, C. Adolphsen, Zenghai Li, Cho-Kuen Ng, Claudio Rivetta · 2017

Radiofrequency cavities based on superconducting technology are widely used in particle accelerators for various applications. The cavities usually have high quality factors and hence narrow bandwidths, so the field stability is sensitive …

Electro-Mechanical Modeling of the LCLS-II Superconducting Cavities Open

O. Kononenko, C. Adolphsen, Zenghai Li, T. Raubenheimer, Claudio Rivetta · 2017

The 4 GeV LCLS-II superconducting linac will contain 280, 1.3 GHz TESLA-style cavities operated CW at 16 MV/m. Because of the low beam current, the cavity bandwidth will be fairly small, about 32 Hz, which makes the field stability sensiti…

50 MW X-Band RF System for a Photoinjector Test Station at LLNL Open

Roark Marsh, S. G. Anderson, C J Barty, Glenn Beer, Robert R. Cross , et al. · 2016

In support of X-band photoinjector development efforts at LLNL, a 50 MW test station is being constructed to investigate structure and photocathode optimization for future upgrades. A SLAC XL-4 klystron capable of generating 50 MW, 1.5 mic…

LCLS-II High Energy (LCLS-II-HE): A transformative X-ray laser for science Open

R. W. Schoenlein, C. Adolphsen, Roberto Alonso‐Mori, Andrew Aquila, Simon R. Bare , et al. · 2016

LCLS-II-HE at SLAC will be a transformative X-ray tool for the scientific mission of DOE Basic Energy Sciences (BES) and for the nation. It represents the vital next step in the ongoing revolution in X-ray lasers, triggered by the world’s …

Overview of Current Progress on the LLNL Nuclear Photonics Facility and Mono-energetic Gamma-ray Source Open

F. V. Hartemann, F. Albert, S. G. Anderson, A.J. Bayramian, R.R. Cross , et al. · 2016

A new class of ￻ -ray light source based on Compton scattering is made possible by recent progress in accelerator physics and laser technology. Mono-energetic ￻ -rays are produced from collisions between a highbrightness, relativistic elec…

Performance of a first generation X-band photoelectron rf gun Open

C. Limborg-Deprey, C. Adolphsen, D. McCormick, M. Dunning, K. Jobe , et al. · 2016

Building more compact accelerators to deliver high brightness electron beams for the generation of high flux, highly coherent radiation is a priority for the photon science community. A relatively straightforward reduction in footpr…

Two-photon photoemission from a copper cathode in an-band photoinjector Open

H. Li, C. Limborg-Deprey, C. Adolphsen, D. McCormick, M. Dunning , et al. · 2016

This study presents two-photon photoemission from a copper cathode in an X-band photoinjector. We experimentally verified that the electron bunch charge from photoemission out of a copper cathode scales with laser intensity (I) square for …

Distribution of Heating from Untrapped HOM Radiation in the LCLS-II Cryomodules Open

Karl Bane, C. Nantista, C. Adolphsen, T. Raubenheimer, A. Saini , et al. · 2016

The superconducting cavities in the CW linacs of LCLS-II will operate at 2 K, where cooling is very expensive. One source of heat is presented by the higher order mode (HOM) power deposited by the beam. Due to the very short bunch length, …

Field Emission Radiation Characterization of LCLS-II Cavities Open

Mario Santana-Leitner, Sebastian Aderhold, C. Adolphsen, Lixin Ge, Anna Grassellino , et al. · 2016

LCLS-II XFEL facility at the SLAC National Accelerator Laboratory will accelerate CW beams of up to 300 uA to 4 GeV using superconducting radio frequency cavities. Before installation, fully assembled cryomodules will be tested at Fermilab…

Studies of radiation fields of LCLS-II super conducting radio frequency cavities Open

M. Santana Leitner, Lixin Ge, Z. Li, Cuilian Xu, C. Adolphsen , et al. · 2016

The Linac Coherent Light Source II (LCLS-II) will be a hard X-ray Free Electron Laser whose linac can deliver a 1.2 MW CW electron beam with bunch rates up to 1 MHz. To efficiently generate such a high power beam, Super-Conducting Radio-Fr…

Achieved Performance of an All X-band Photo-injector Open

C. Limborg, C. Adolphsen, M. Dunning, R.K. Jobe, Heng Li , et al. · 2016

Building more compact accelerators to deliver high brightness electron beams for the generation of high flux, highly coherent radiation is a priority for the photon science community. A relatively straightforward reduction in footprint can…

C. Adolphsen YOU? Author Swipe