Tianmu Xin
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View article: Soft Gripper Gloves with Mirroring System Design for Hand Rehabilitation
Soft Gripper Gloves with Mirroring System Design for Hand Rehabilitation Open
Over the last decade, soft robotic gripper systems, such as grippers, have been used in a variety of applications, particularly in human rehabilitation. This study aims to enhance the rehabilitation process by creating a mirroring system g…
View article: Simulations of multipacting in the cathode stalk and FPC of 112 MHz superconducting electron gun
Simulations of multipacting in the cathode stalk and FPC of 112 MHz superconducting electron gun Open
A 112 MHz superconducting quarter-wave resonator electron gun will be used as the injector of the Coherent Electron Cooling (CEC) proof-of-principle experiment at BNL. Furthermore, this electron gun can be used for testing of the performan…
View article: Long lifetime of bialkali photocathodes operating in high gradient superconducting radio frequency gun
Long lifetime of bialkali photocathodes operating in high gradient superconducting radio frequency gun Open
High brightness, high charge electron beams are critical for a number of advanced accelerator applications. The initial emittance of the electron beam, which is determined by the mean transverse energy (MTE) and laser spot size, is one of …
View article: Anomalous skin effect study of superconducting film
Anomalous skin effect study of superconducting film Open
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…
View article: Double Quarter Wave Crab Cavity Wire Stretching Measurement at BNL
Double Quarter Wave Crab Cavity Wire Stretching Measurement at BNL Open
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 …
View article: Design and Measurement of the 1.4 GHz Cavity for LEReC Linac
Design and Measurement of the 1.4 GHz Cavity for LEReC Linac Open
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.…
View article: Anomalous Skin Effect Study of Normal Conducting Film
Anomalous Skin Effect Study of Normal Conducting Film Open
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…
View article: Double Quarter Wave Crab Cavity Wire Stretching Measurement at BNL
Double Quarter Wave Crab Cavity Wire Stretching Measurement at BNL Open
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…
View article: High-Brightness Continuous-Wave Electron Beams from Superconducting Radio-Frequency Photoemission Gun
High-Brightness Continuous-Wave Electron Beams from Superconducting Radio-Frequency Photoemission Gun Open
Continuous-wave photoinjectors operating at high accelerating gradients promise to revolutionize many areas of science and applications. They can establish the basis for a new generation of monochromatic x-ray free electron lasers, high-br…
View article: Study of the anomalous skin effect of normal conducting film
Study of the anomalous skin effect of normal conducting film Open
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…
View article: Experimental Demonstration of Hadron Beam Cooling Using Radio-Frequency Accelerated Electron Bunches
Experimental Demonstration of Hadron Beam Cooling Using Radio-Frequency Accelerated Electron Bunches Open
Cooling of beams of gold ions using electron bunches accelerated with radio-frequency systems was recently experimentally demonstrated in the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. Such an approach is new and op…
View article: Design and test of 704 MHz and 2.1 GHz normal conducting cavities for low energy RHIC electron cooler
Design and test of 704 MHz and 2.1 GHz normal conducting cavities for low energy RHIC electron cooler Open
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…
View article: Coherent Electron Cooling (CeC) Experiment at RHIC: Status and Plans
Coherent Electron Cooling (CeC) Experiment at RHIC: Status and Plans Open
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 …
View article: Performance of 112 MHz SRF Gun at BNL
Performance of 112 MHz SRF Gun at BNL Open
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…
View article: Correction of Crosstalk Effect in the LEReC Booster Cavity
Correction of Crosstalk Effect in the LEReC Booster Cavity Open
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…
View article: Design report for eRHIC splitter cavities
Design report for eRHIC splitter cavities Open
review the possibilities of Nb/Cu cavities for the future crabbing system of eRHIC. This note will study the feasibility of usingWOW cavities for the eRHIC crabbing system and will compare the expected performances of DQW and WOW cavities …
View article: Wake loss and energy spread factor of the LEReC Booster cavity caused by short range wake field
Wake loss and energy spread factor of the LEReC Booster cavity caused by short range wake field Open
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 distance [2]. In this case…
View article: Commissioning of the Normal Conducting Cavities for LEReC Project
Commissioning of the Normal Conducting Cavities for LEReC Project Open
To improve RHIC luminosity for heavy ion beam energies below 10 GeV/nucleon, the Low Energy RHIC electron Cooler (LEReC) is designed, and is currently under commissioning at BNL. The linac of LEReC consists of a DC photoemission gun, a 704…
View article: Improvement of Wire-Stretching Technique to the RF Measurements of E-Center and Multipole Field for the Dipole Cavities
Improvement of Wire-Stretching Technique to the RF Measurements of E-Center and Multipole Field for the Dipole Cavities Open
After the first publication* of wire-stretching technique from its principle to measure the electrical center of a deflecting cavity, more refinements of this techniques including the review of its analytical and simulation results, RF cir…
View article: Measuring the Electrical Center and Field Flatness of 704 MHz Deflecting Cavity for LEReC with Wire Stretching System
Measuring the Electrical Center and Field Flatness of 704 MHz Deflecting Cavity for LEReC with Wire Stretching System Open
704 MHz deflecting cavity was designed for the Low Energy RHIC electron Cooling (LEReC) project. The cavity will serve as a major component in diagnostic line. In LEReC project the requirement on the energy spread of the electron beam is e…
View article: Commissioning of FEL-Based Coherent Electron Cooling System
Commissioning of FEL-Based Coherent Electron Cooling System Open
In this talk we are presenting the most recent results from the commissioning of unique Coherent Electron Cooling system, which is using an FEL amplifier to facilitate cooling of hadrons by an electron beam. We present achieved results as …
View article: Crosstalk Effect in the LEReC Booster Cavity
Crosstalk Effect in the LEReC Booster Cavity Open
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…
View article: Commissioning of the SRF Booster Cavity for LEReC
Commissioning of the SRF Booster Cavity for LEReC Open
One important component for LEReC project is a 704 MHz booster cavity, which was modified from the BNL ERL 704 MHz SRF gun cavity. The major modifications include converting the upstream cathode transportation to a proper beam pipe, adding…
View article: Status of Proof-of-Principle Experiment of Coherent Electron Cooling at BNL
Status of Proof-of-Principle Experiment of Coherent Electron Cooling at BNL Open
The coherent electron cooling proof-of-principle experiment is aimed to demonstrate new technique suitable for cooling of the high energy protons and is essential for a future electron-hadron collider. In this paper we present the current …
View article: Novel HOM Damper Design for High Current SRF Cavities
Novel HOM Damper Design for High Current SRF Cavities Open
ERL-Ring eRHIC aims to build a new high current (50 mA), multi-pass (6 passes) ERL to provide 3-18 GeV electron beams to collide with proton beams from existing RHIC. One critical challenge for eRHIC is to damp HOMs. The average HOM power …
View article: A NEW CONCEPT FOR HIGH POWER RF COUPLING BETWEEN WAVEGUIDES AND RESONANT RF CAVITIES
A NEW CONCEPT FOR HIGH POWER RF COUPLING BETWEEN WAVEGUIDES AND RESONANT RF CAVITIES Open
Microwave engineering of high average-power (hundreds of kilowatts) devices often involves a transition from a waveguide to a device, typically a resonant cavity. This is a basic operation, which finds use in various application areas of s…
View article: K2CsSb Photocathode Performance in QWR SRF Gun
K2CsSb Photocathode Performance in QWR SRF Gun Open
In 2016 run of Coherent Electron Cooling, we have successfully tested the performance of a number of K2CsSb cathodes. These cathodes with QE of 6%-10% were fabricated in Instrumentation Division, a few miles away, transported to RHIC tunne…
View article: Publisher’s Note: Experimental measurements and theoretical model of the cryogenic performance of bialkali photocathode and characterization with Monte Carlo simulation [Phys. Rev. Accel. Beams <b>19</b>, 103401 (2016)]
Publisher’s Note: Experimental measurements and theoretical model of the cryogenic performance of bialkali photocathode and characterization with Monte Carlo simulation [Phys. Rev. Accel. Beams <b>19</b>, 103401 (2016)] Open
Received 25 October 2016DOI:https://doi.org/10.1103/PhysRevAccelBeams.19.119901Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attr…
View article: Experimental measurements and theoretical model of the cryogenic performance of bialkali photocathode and characterization with Monte Carlo simulation
Experimental measurements and theoretical model of the cryogenic performance of bialkali photocathode and characterization with Monte Carlo simulation Open
High-average-current, high-brightness electron sources have important applications, such as in high-repetition-rate free-electron lasers, or in the electron cooling of hadrons. Bialkali photocathodes are promising high-quantum-efficiency (…