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202 FRIB Graduate Brochure

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Steven Lidia<br />

Senior Physicist and Adjunct Professor of Physics<br />

and Electrical and Computer Engineering<br />

Keywords: Accelerator Systems, Beam Diagnostics High-Performance Controls,<br />

Advanced Instrumentation, High Brightness Beams<br />

Accelerator Physics<br />

About<br />

• PhD, Physics, University of California at Davis, 1999<br />

• Joined the laboratory in August 2016<br />

• lidia@frib.msu.edu<br />

Research<br />

Contemporary and planned accelerator facilities are<br />

pushing against several development frontiers. Facilities<br />

like the Facility for Rare Isotope Beams, the European<br />

Spallation Source, FAIR@ GSI, IFMIF, SARAF, and others<br />

are currently expanding the limits of the intensity frontier<br />

of proton and heavy ion beams. These high-intensity<br />

hadron beams are intrinsically useful for nuclear science<br />

as they permit exploration of low cross section reactions<br />

with reasonable experimental data collection rates. These<br />

same beams, however, also present distinct hazards<br />

to machine operation from uncontrolled beam losses.<br />

Optimum scientific performance of these facilities requires<br />

us to predict and measure the behavior of intense beams.<br />

The development of diagnostic techniques and advanced<br />

instrumentation allows the accelerator scientist to create<br />

and to tune beamlines that preserve beam quality measures<br />

while allowing for precise manipulation and measurement<br />

of the beam’s energy, intensity, trajectory, isotope content,<br />

and phase space density and correlations. We utilize<br />

sophisticated codes to model the dynamics of multicomponent<br />

particle beams and their electromagnetic,<br />

thermal, and nuclear interactions with materials and<br />

devices. We design sensor devices and components<br />

that enable us to make specific measurements of beam<br />

parameters. These sensors are paired with electronic<br />

signal acquisition, analysis, and control systems to provide<br />

timely data that permit beam tuning and to monitor beam<br />

behavior and beamline performance. These systems are<br />

built and tested in the laboratory before commissioning<br />

with beam.<br />

Like accelerator science, in general, development<br />

of diagnostic and control techniques involve the<br />

understanding and utilization of diverse subject matter<br />

from multiple physics and engineering sub-disciplines.<br />

prediction and measurement of beam instabilities; and<br />

development of electronics, firmware, and software to<br />

interface with these sensors. Specific instrumentation<br />

developments will enable non-intercepting bunch<br />

length and profile measurements, monitors for ion beam<br />

contaminant species and diffuse beam halo, machine<br />

learning techniques for integrating loss monitor networks,<br />

and compact sources of soft x-rays for nuclear structure<br />

measurements.<br />

Time-averaged phase space density measurements of<br />

30 mA, 130 keV Li+ beam using scanning slit and slit<br />

Faraday cup.<br />

Selected Publications<br />

P. N. Ostroumov, S. Lidia, et al, “Beam commissioning<br />

in the first superconducting segment of the Facility for<br />

Rare Isotope Beams”, Phys. Rev. Accel. Beams 22, 080101<br />

(2019).<br />

P.A. Ni, F.M. Bieniosek, E. Henestroza and S.M. Lidia, “A<br />

multi-wavelength streak-optical- pyrometer for warmdense<br />

matter experiments at NDCX-I and NDCX-II”, Nucl.<br />

Instrum. Methods Phys. Res. A 733 (2014), 12-17.<br />

J. Coleman, S.M. Lidia, et. al., “Single-pulse and multipulse<br />

longitudinal phase space and temperature measurements<br />

of an intense ion beam”, Phys. Rev. ST Accel. Beams 15,<br />

070101 (2012).<br />

Current projects within the group are centered on<br />

measurements to understand the behavior of intense,<br />

multi-charge state ion beams; high sensitivity and high<br />

speed sensors and networks for beam loss monitoring;<br />

accurate beam profile monitoring and tomography;<br />

non-invasive beam profile measurement techniques;<br />

57<br />

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