22 Papers
121 Citations
H. Ma is an academic researcher from Oak Ridge National Laboratory. The author has contributed to research in topics: Spallation Neutron Source & Digital control. The author has an hindex of 8, co-authored 22 publications.
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Papers
Overview of the Spallation Neutron Source Linac Low-Level RF Control System
Mark Champion,M. Crofford,K. Kasemir,H. Ma,M. Piller,Lawrence Doolittle,Alex Ratti +6 more
- 16 May 2005
TL;DR: The design and production of the Spallation Neutron Source Linac Low-Level RF control system is complete, and installation will be finished in Spring 2005 as discussed by the authors, and the most extensive test to date of the LLRF control system, with fourteen (of an eventual 96) systems operating simultaneously.
Low-level rf control of Spallation Neutron Source: System and characterization
TL;DR: The low-level rf control system currently commissioned throughout the Spallation Neutron Source (SNS) LINAC evolved from three design iterations over 1 yr intensive research and development and has succeeded in achieving a minimum latency of 150 ns which is the key for accomplishing an all-digital feedback control for the full bandwidth.
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The Spallation neutron source accelerator low level RF control system
Mark Champion,M. Crofford,H. Ma,M. Piller,Alex Ratti,Lawrence Doolittle,M. Monroy,S. DeSantis,H. Shoaee,K. Kasemir,S. Kwon,J. Power,M. Prokop,A. Regan,M. W. Stettler,D. Thomson +15 more
- 12 May 2003
TL;DR: The Spallation Neutron Source low level RF (LLRF) control system as mentioned in this paper was developed by a team of members from Lawrence Berkeley, Los Alamos, and Oak Ridge national laboratories.
Operational performance of the SNS LLRF interim system
Lawrence Doolittle,Alex Ratti,M. Monroy,Mark Champion,H. Ma +4 more
- 12 May 2003
TL;DR: In this paper, an interim version of the Low-Level RF Control System for the SNS Front End and Linear Accelerators was constructed to support short-term goals and early commissioning of the Front End RFQ and DTL accelerators, while the final system is under development.
Status and performance of the spallation neutron source superconducting linac
Isidoro E Campisi,S. Assadi,Fabio Casagrande,Mark Crofford,G. Dodson,John D Galambos,M. Giannella,S. Henderson,M. Howell,Yoon W. Kang,K. Kasemir,Sang-Ho Kim,Z. Kursun,P. Ladd,H. Ma,D. Stout,W. Strong,Yan Zhang,Mark Champion +18 more
- 25 Jun 2007
TL;DR: The Superconducting Linac at SNS has been operating with beam for almost two years and has been consistently conducted at 4.4 K and 10 and 15 pulses per second with some cryomodules tested at 30 and 60 Hz and some tests performed at 2 K as discussed by the authors.
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