Contemporary and planned accelerators are pushing against several development frontiers. Facilities like the Facility for Rare Isotope Beams, the European Spallation Source, FAIR@GSI, IFMIF, SARAF, and others are currently expanding the limits of the intensity frontier of proton and heavy ion beams. These high intensity hadron beams are intrinsically useful for nuclear science as they permit exploration of low cross section reactions with reasonable experimental data collection rates. These same beams, however, also present distinct hazards to machine operation from uncontrolled beam losses. Optimum scientific performance of these facilities requires us to predict and measure the behavior of intense beams.
The development of diagnostic techniques and advanced instrumentation allows the accelerator scientist to create and to tune beamlines that preserve beam quality measures while allowing for precise manipulation and measurement of the beam’s energy, intensity, trajectory, isotope content, and phase space density and correlations. We utilize sophisticated codes to model the dynamics of multi-component particle beams and their electromagnetic and nuclear interaction with materials and devices. We then design sensor devices and components that enable us to make specific measurements of beam parameters. These sensors are paired with electronic data acquisition and control systems to provide timely data to permit beam tuning and to monitor beam behavior and beamline performance. These systems are built and tested in the laboratory before commissioning with beam.
Like accelerator science, in general, development of diagnostic techniques involve the understanding and utilization of diverse subject matter from multiple physics and engineering sub-disciplines. Current projects within the group are centered on measurements to understand the behavior of intense, multi-charge state ion beams; high sensitivity and high speed sensors and networks for beam loss monitoring; accurate beam profile monitoring and tomography; non-invasive beam profile measurement techniques; prediction and measurement of beam instabilities; and development of electronics, firmware, and software to interface with these sensors.
Time-averaged phase space density measurements of 30 mA, 130 keV Li+ beam using scanning slit and slit Faraday cup.
Selected PublicationsS. Lidia, “Instrumentation and Challenges at FRIB”, Presented at the 54th ICFA Advanced Beam Dynamics Workshop, HB2014, East Lansing, MI, November, 2014.
P.A. Ni, F.M. Bieniosek, E. Henestroza and S. M. Lidia, “A multi-wavelength streak-optical-pyrometer for warm-dense matter experiments at NDCX-I and NDCX-II”, Nucl. Instrum. Methods Phys. Res. A 733 (2014), 12-17.
J. Coleman, S.M. Lidia, et. al., “Single-pulse and multipulse longitudinal phase space and temperature measurements of an intense ion beam”, Phys. Rev. ST Accel. Beams 15, 070101 (2012).
Y. Sun, S. Lidia, et. al., “Generation of angular-momentum-dominated electron beams from a photoinjector”, Phys. Rev. ST Accel. Beams 7, 123501 (2004).
T. Houck and S. Lidia, “Beam dynamics experiments to study the suppression of transverse instabilities”, Phys. Rev. ST Accel. Beams 6, 030101 (2003).