Explanipedia

Dynamic Focusing to Suppress Emittance Transfer in Crab-Crossing Flat Beam Collisions Open

Derong Xu, J. Scott Berg, M. Blaskiewicz, Yue Hao, Yun Luo , et al. · 2025

Flat hadron beam collisions, though expected to enhance peak luminosity by about an order of magnitude, have not yet been demonstrated. Our study reveals a critical limitation: realistic fluctuations, when amplified by synchro-betatron res…

COMMISSIONING OF THE SRF SURFACE IMPEDANCE CHARACTERIZATION SYSTEM AT JEFFERSON LAB Open

Binping Xiao, Charles Reece, Frank Marhauser, Haipeng Wang, Harry A. Phillips , et al. · 2023

Superconducting radio frequency (SRF) technology is widely adopted in particle accelerators. There remain many open questions, however, in developing a systematic understanding of the fundamental behavior of SRF materials, including niobiu…

Energetic Condensation Growth of Nb Thin-Films for SRF Applications Open

Mahadevan Krishnan, B. Bures, K. Wilson-Elliott, Harry R. Phillips, Charles Reece , et al. · 2023

AASC, JLab and NSU conduct research into SRF thin-film coatings by first characterizing properties such as morphology, grain size, crystalline structure, defects, and impurities, then measuring Tc and RRR, and following this with ?in-cavit…

RF SURFACE IMPEDANCE OF MgB2 THIN FILMS AT 7.5 GHz Open

Harry A. Phillips, Charles Reece, Michael J. Kelley, Binping Xiao, T. Tajima · 2023

The Surface Impedance Characterization (SIC) system in Jefferson Lab can presently make direct calorimetric RF surface impedance measurements on the central 0.8 cm2 area of 5 cm diameter disk samples from 2 to 20 K exposed to RF magnetic f…

Heavily Damped Crab Cavities for High Luminosity Collisions Open

Binping Xiao · 2023

Next generation colliders require crab cavities to mitigate parasitic collisions caused by finite crossing angle for luminosity leveling and detector data pile up reduction. The Electron Ion Collider (EIC) crab cavity designs will be intro…

Development of a Prototype 197 MHz Crab Cavity for the Electron-Ion Collider at JLab Open

Naeem Huque, James Henry, Matthew Marchlik, Eduard Drachuk, Alejandro Castilla Loeza , et al. · 2023

Thomas Jefferson National Accelerator Facility (JLab) is currently developing a prototype 197 MHz Radio-Frequency Dipole (RFD) crab cavity as part of the Electron-Ion Collider (EIC) to be built at Brookhaven National Laboratory (BNL). Cryo…

Crab Cavities for ILC Open

Peter McIntosh, S. Belomestnykh, Graeme Burt, R. Calaga, Subashini De Silva , et al. · 2023

For the 14 mrad crossing angle proposed, crab cavity systems are fundamentally anticipated for the viable operation of the International Linear Collider (ILC), in order to maximise its luminosity performance. Since 2021, a specialist devel…

Design of a Third Harmonic Cavity With Low R/Q for the ESR in BNL EIC Open

Binping Xiao · 2022

For the electron Storage Ring (ESR) of Brookhaven National Lab Electron Ion Collider (BNL EIC), beam loading is a great concern due to the high beam current together with abortion gap, especially for harmonic cavities due to higher operati…

HOM Damper Design for BNL EIC 197 MHz Crab Cavity Open

Binping Xiao, J.R. Delayen, S. U. De Silva, Z. Li, R. Rimmer , et al. · 2022

The interaction region (IR) crab cavity system is a special RF system to compensate the loss of luminosity due to a 25 mrad crossing angle at the interaction point (IP) for BNL EIC. There will be six crab cavities, with four 197 MHz crab c…

OPERATIONAL EXPERIENCE AND REDESIGN OF THE TUNER WITH-OUT SPRING FINGERS FOR THE LEReC WARM CAVITY Open

Binping Xiao, J.M. Brennan, J.C. Brutus, K. Mernick, S. Polizzo , et al. · 2021

A folded coaxial tuner without spring fingers was de-signed for the Low Energy Relativistic Heavy Ion Collider (RHIC) electron Cooler (LEReC) 2.1 GHz warm cavity. During RHIC run 2019, this tuner was found to cause cavity trips via differe…

Pathways for a compact double-quarter wave cavity with low peak surface fields and large deflecting kick Open

Silvia Verdú-Andrés, Binping Xiao · 2021

This paper describes the parameter choices necessary to obtain a compact Double Quarter Wave (DQW) cavity with low peak surface fields – electric and magnetic – and large deflecting kick. The work is motivated by the space limitations and …

Anomalous skin effect study of superconducting film Open

Binping Xiao, M. Blaskiewicz, Tianmu Xin · 2021

The field distribution inside the superconducting radiofrequency (SRF) film with different mean free path is studied using niobium (Nb) as an example. The surface resistance of clean Nb film with different substrate and different film thic…

Double Quarter Wave Crab Cavity Wire Stretching Measurement at BNL Open

Qiong Wu, Tianmu Xin, Binping Xiao · 2021

The wire stretching measurement was completed on the prototype Double Quarter Wave (DQW) crab cavity for operation practice and calibration of the measurement system. Four locations were defined to be on the electrical center plane of the …

Operational Experience and Redesign of the Tuner without Spring Fingers for the LEReC Warm Cavity Open

Binping Xiao, Joseph Brennan, Jean Clifford Brutus, K. Mernick, Salvatore Polizzo , et al. · 2021

A folded coaxial tuner without spring fingers was designed for the Low Energy RHIC electron Cooler (LEReC) 2.1 GHz warm cavity. During RHIC run 2019, this tuner was found to cause cavity trips via different failure modes. After analyzing t…

Design and Measurement of the 1.4 GHz Cavity for LEReC Linac Open

Binping Xiao, Jean Clifford Brutus, J. Fite, K. Hamdi, Douglas Holmes , et al. · 2021

The Low Energy RHIC electron Cooler (LEReC) is the first electron cooler based on rf acceleration of electron bunches. To further improve RHIC luminosity for heavy ion beam energies below 10 GeV/nucleon, a normal conducting RF cavity at 1.…

Optimization of the Hadron Ring Stripline Injection Kicker for the EIC Open

Medani Sangroula, C.J. Liaw, Chuyu Liu, Xiang Sun, N. Tsoupas , et al. · 2021

The Electron-Ion Collider (EIC) at Brookhaven National Laboratory is a high luminosity, ( ∼ 10³⁴ \textrm{cm}⁻² \textrm{s}⁻¹ ) accelerator facility colliding polarized electron beam with different ion species ranging from lighter nuclei (pr…

Anomalous Skin Effect Study of Normal Conducting Film Open

Binping Xiao, M. Blaskiewicz, Tianmu Xin · 2021

For the radiofrequency (RF) applications of normal conducting film with large mean free path at high frequency and low temperature, the anomalous skin effect differs considerably from the normal skin effect with field decaying exponentiall…

EIC Crab Cavity Multipole Analysis Open

Qiong Wu, Subashini De Silva, Yun Luo, J. Mitchell, Binping Xiao · 2021

Crab cavities are specialized RF devices designed for colliders targeting high luminosities. It is a straightforward solution to retrieve head-on collision with crossing angle existing to fast separate both beams after collision. The Elect…

Double Quarter Wave Crab Cavity Wire Stretching Measurement at BNL Open

Qiong Wu, Tianmu Xin, Binping Xiao · 2020

The Double Quarter Wave (DQW) crab cavity is one out of the two crab cavities within Work Package 4 of the LHC (Large Hadron Collider) Hi-Lumi Program, and the RF design of the cavity was originally supported by the US LHC Accelerator Rese…

Study of the anomalous skin effect of normal conducting film Open

Binping Xiao, M. Blaskiewicz, Tianmu Xin · 2020

For the radiofrequency (RF) applications of normal conducting film with large mean free path at high frequency and low temperature, the anomalous skin effect differs considerably from the normal skin effect with field decaying exponentiall…

rf surface impedance of a two-band superconductor Open

Binping Xiao, Charles Reece · 2019

In this paper, we extend the Mattis-Bardeen theory to obtain the surface impedance of a two-band superconductor, and apply it to magnesium diboride (MgB₂) for radiofrequency (RF) superconductivity applications. The numerical cal…

Design and test of 704 MHz and 2.1 GHz normal conducting cavities for low energy RHIC electron cooler Open

Binping Xiao, S. Belomestnykh, J.M. Brennan, J. C. Brutus, Garry J. McIntyre , et al. · 2019

The Low Energy RHIC electron Cooler (LEReC) is currently under commissioning\nat BNL to improve RHIC luminosity for heavy ion beam energies below 10\nGeV/nucleon. The linac of LEReC consists of a DC photoemission gun, one 704 MHz\nsupercon…

Cryogenic RF Performance of Double-Quarter Wave Cavities Equipped with HOM Filters Open

Silvia Verdú-Andrés, I. Ben‐Zvi, Graeme Burt, R. Calaga, Ofelia Capatina , et al. · 2019

Crab cavities are one of the several components included in the luminosity upgrade of the Large Hadron Collider (HL-LHC). The cavities have to provide a nominal deflecting kick of 3.4 MV per cavity while the cryogenic load per cavity stays…

Coherent Electron Cooling (CeC) Experiment at RHIC: Status and Plans Open

Vladimir Litvinenko, Z. Altinbas, Jean Clifford Brutus, Anthony Di Lieto, D. Gassner , et al. · 2019

We will present currents status of the CeC experiment at RHIC and discuss plans for future. Special focus will be given to unexpected experimental results obtained during RHIC Run 18 and discovery of a previously unknown type of microwave …

Performance of 112 MHz SRF Gun at BNL Open

Tianmu Xin, S. Belomestnykh, I. Ben‐Zvi, C. Boulware, Jean Clifford Brutus , et al. · 2019

A 112 MHz SRF electron photoinjector (gun) was developed at Brookhaven National Laboratory to produce high-brightness and high-bunch-charge bunches for the coherent electron cooling proof-of-principle experiment. The gun is designed to del…

Correction of Crosstalk Effect in the LEReC Booster Cavity Open

Binping Xiao, K. Mernick, F. Severino, Scott Smith, Tianmu Xin , et al. · 2019

The Linac of Low Energy RHIC electron Cooler (LEReC) is designed to deliver a 1.6 MeV to 2.6 MeV electron beam, with peak-to-peak dp/p less than 7·10⁻⁴. The booster cavity is the major accelerating component in LEReC, which is a 0.4 cell c…

Simulations for the LEReC fast closing valves Open

Binping Xiao · 2018

reliability engineering techniques currently applied to other safety critical programs or industries. The review also indicates that the management structures that have evolved as a result of this narrow definition of NRC responsibility do…

HOM induced energy spread and emittance growth in LEReC system Open

Binping Xiao · 2018

To map the QCD phase diagram, especially to search the QCD critical point using the Relativistic Heavy Ion Collider (RHIC), significant luminosity improvement at energies below γ =10.7 is required, which can be achieved with the help of an…

rf surface impedance of a two-gap superconductor, considering magnesium diboride for accelerator applications Open

Binping Xiao, Charles Reece · 2018

In this paper, we apply the two-band extension [1] of BCS theory [2] into the Mattis-Bardeen theory [3] to obtain the surface impedance of a two-band superconductor, and apply it to magnesium diboride (MgB2) for radiofrequency (RF) superco…

Wake loss and energy spread factor of the LEReC Booster cavity caused by short range wake field Open

Binping Xiao, M. Blaskiewicz, A. V. Fedotov, Tianmu Xin · 2018

LEReC project uses a DC photoemission gun with multi-alkali (CsK₂Sb or NaK₂Sb) cathode [1]. To get 24 mm “flat-top” distribution, 32 Gaussian laser bunches with 0.6 mm rms length are stacked together with 0.75 mm dist…

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