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Seminar Series

2012

August 1, 2012
Alberto Fasso, Jefferson Lab
"Radiation Quantities, Physics Laws and Human Laws"
Building 028, RP Library Room #135, 1:00 pm to 2:30 pm

January 13, 2012
Rick Donahue
, Berkeley National Lab
"Permanent Magnet Radiation Damage: Thoughts on Focus of Future Measurements"
Building 24, Room 126, ES&H Conference room, 3:00 pm to 4:00 pm

Abstract:
Synchrotron and FEL facilities rely on insertion devices to produce intense x-ray beams. These insertion devices consist of periodic arrays of permanent magnets with identical magnetic field strengths. Variations in field strength of a percent or more cannot be tolerated. This has been an area of concern for current kW-scale FEL facilities (LCLS-I/II, XFEL/RIKEN) and represents a challenge for MW-scale facilities (XFEL/DESY, NGLS). Radiation-induced damage of permanent magnets has been known for 30+ years, yet the underlying damage mechanisms are not well understood. Most of the published experimental work on radiation damage seeks to correlate bulk magnet damage with absorbed dose, particle fluence, star density, etc., yet few works describe in any detail the microstructure of the irradiated magnets. This talk discusses possible shortcomings of published damage measurements and provides some suggestions for future measurements in order to gain a better understanding of the underlying mechanisms.  

 

2011

Xavier Queralt, ALBA September 29, 2011
"ALBA-The Newest Synchrotron Facility in Europe: A Radiation Protection Approach "
BLDG. 24, Room 126 ES&H Conference room 3:45 pm to 5:15 pm

Sunil Chitra, September 13, 2011
"Neutron Spectrometry Using Time of Flight Measurements: Estimation of Thick Target Neutron Yield in an Ion Accelerator "
BLDG. 24, Room 126 ES&H Conference room 4:00 pm to 5:00 pm

Paul Berkvens, ESRF September 06, 2011
"Radiation Therapy Clinical Trials at the ESRF: Dosimetry and Patient Safety Aspects"
BLDG. 24, Room 126 ES&H Conference room 4:00 pm to 5:00 pm

Stefan Roesler, CERN August 30, 2011
"Radiation Protection at the Large Hadron Collider - from Design to Operation"
BLDG. 24, Room 126 ES&H Conference room 4:00 pm to 5:00 pm

2010

Ludovic Nicolas, July 14, 2010
"Simulation of The Radiation Levels in An Accelerator Environment"
BLDG. 40, Room 147 Cypress Conference room 3:00 pm to 4:00 pm

Abstract:
The understanding of the radiation environment of an high energy physics accelerator and its experiments is as necessary as it is challenging.

Taking the example of both the Tevatron and CDF at Fermilab and the LHC and ATLAS at CERN, the variety of the sources that contribute to the radiation levels is such that simply relying on measurements when they are available is not enough for a complete characterization. Furthermore, the problems are too complex to be treated analytically.

Computer simulations with the MARS and FLUKA Monte Carlo codes are necessary because they are often the only information of what the dose to the machine elements, detector parts and personnel will be beforehand, all important points that help to design new machines or to assess the impact of modifications. They are challenging also, because the determination of the radiation levels in research centers of such large dimensions and that push the energy frontier often calls for the development of novel techniques. Examples will be presented to illustrate the use of these codes to create models that can predict particle fluxes, energy deposited and induced radioactivity for various applications at Fermilab and CERN, and their benchmark with data when it was possible.  

Shanjie Xiao, June 11, 2010
"Geant4 based Monte Carlo Dose Calculation Engine and Intelligent Nuclear Material Detection System"
BLDG. 24, Room 126 ES&H Conference room 3:30 pm to 4:30 pm

Zhenghua "Amy" Xia, May 14, 2010
"MCNP Simulating OSL Ring Response Matrix for X-Ray Spectrums"
BLDG. 24, Room 126 ES&H Conference room 3:30 pm to 4:30 pm

Sirikul Indi Sriprisan, May 10, 2010
"Performance evaluation of optical CT Polymer Gel Dosimetry System for 3D Dose Verification of Proton Beam Therapy"
BLDG. 24, Room 126 ES&H conference room 3:30 pm to 4:30 pm

Peter Song, April 20, 2010
"Neutron Radiation Shielding for the NIF Streaked X-Ray Detector (SXD) Diagnostic"
BLDG. 34, Room R105 Controls conference room 3:30 pm to 4:30 pm

Hesham Khater, March 16, 2010
"Simulation of the Radiation Environment in the National Ignition Facility"
BLDG. 40, Room R147 Cypress conference room 3:00 pm to 4:00 pm

2009

Toshiya Sanami, June 4, 2009
"Double Differential Cross Section of Fragment Production From Tens MeV Proton Induced Reactions Using Bragg Curve Counter"
BLDG. 24 1st floor, Room 126 3:00 pm to 4:00 pm

Luisa Ulrici, February 12, 2009
"Radioactive Waste Management and Decommissioning at CERN"
BLDG. 24, 1st floor, Room 126 3:00 pm to 4:00 pm

2008

Hee-Seock, October 3, 2008
"Recent Status and Experience of Demagnetization Experiment at PAL"
BLDG. 03 RP Library Conference Room 104 3:00 pm to 4:00 pm

Kevin Roberts, September 12, 2008
"Determine Radiological Consequence for Integrated Safety Analysis"
BLDG. 24, 1st floor, Room 126 2:30 pm to 3:30 pm

Marcia Torres, September 10, 2008
"Dose rate characterization for extremity exposure investigation"
BLDG. 24, 1st floor, Room 126 2:30 pm to 3:30 pm

Qiu Riu, July 23, 2008
Tsinghua University, Beijing, China
"Radiation Damage of Nd2Fe14B Permanent Magnets at a 2.5 GeV Electron Accelerator"
BLDG. 24, 1st floor, Room 126, 4:00 pm to 5:00 pm

2007

Paul Berkvens, September 4, 2007
European Synchrotron Radiation Facility
"Injection with Front Ends Open at the ESRF: Radiation Protection Aspects"
SSRL, BLDG.137, 3rd floor, Room 322 - 3:30 pm to 5:00 pm

Joachim Vollaire, April 6, 2007
CERN
"
Calculation of Water Activation in the Water Circuits of the Large Hadron Collider"

2006

Stefan Roesler, June 30, 2006
CERN
"Measurement and Simulation of High-Energy Neutron Spectra Outside Shielding of an Hadron Accelerator"

Hee-Sock Lee, March 29, 2006
Pohang Accelerator Laboratory
"Demagnetization of Permanent Magnets andHigh Level Dosimetry"

Stephen B. Guetersloh, March 17, 2006
Lawrence Berkeley National Laboratory
"Radiation Protection for Manned Space Missions"

Inseok Baek, March 6, 2006
National Superconducting Cyclotron Laboratory
"Simulations for Bulk Shielding Design Around Rare Isotope Accelerator Targets Area"

Panakkal K. Job, February 27, 2006
Advanced Photon Source (APS)
"Operational Radiological Safety Program at the Advanced Photon Source"

2005

Professor Nakamura, April 26, 2005
Tohoku University, Japan
"Regulatory Rules for Radiation in Japan"

2004

Ralph H. Thomas, December 10, 2004 (Canceled)
Lawrence Livermore National Lab
"An Unfinished Quest: Riqour Within Uncertainty"
ICRP Publication 92 and ICRP Draft Recommendations for 2005

Tom Kelly, October 5, 2004
U.S. EPA Region 9; San Francisco
"The US EPA National Environmental Performance Track Program"

Professor Mamoru Baba, September 24, 2004
Tohoku University, Japan
"Radiation Engineering Studies in Tohoku University Cyclotron and Radio Isotope Center (CYRIC)"

2003

Noriaki Nakao, November 18, 2003
Radiation Science Center
"J-PARC 3GeV Ring Shielding Calculation With MARS Monte Carlo Code"

Yoshihiro Asano, September 2, 2003
Synchrotron Radiation Research Center
"Measurements of Absolute Intensities for Intense and High Energy SR Photon Beams at SPing-8 Using Calorimetric Method"

Markus Brugger, June 20, 2003
CERN
"Measurement and Simulation of Induced Radioactivity and Remanent Dose Rates at the CERN-EU High Energy Reference Field Facility"

Syuichi Ban, June 6, 2003
KEK Radiation Science Center
"
Recent Works for Radiation Safety in KEK Radiation Science Center"

Yoshihiro Asano, April 15, 2003
Synchrotron Radiation Research Center
"Radiation Safety Analyses for the Synchrotron Beamlines of SPring-8"

Alberto Fasso, April 1, 2003
CERN
"FLUKA in the 21st Century"

Vashek Vylet, March 18, 2003
Duke University
"Accelerator-Driven Waste Transmutation Experiment"

2002

Shuichi Tsuda, November 11, 2002
Japan Atomic Energy Research Institute
"Research Activities on External Radiation Dosimetry"

Stephan Roesler, September 17, 2002
CERN
"
Monte Carlo Calculation of the Radiation Field at Aircraft Altitudes"

Marco Silari, May 1, 2002
CERN
"Induced Radioactivity in the CERN Accelerators"

Dan Firth, April 16, 2002
Environmental Coordinator & Hazardous Materials
Program Manager for the Palo Alto Fire Department
"Unidocs and the Online Hazardous Materials Inventory Project"

2001

Professor Takashi Nakamura, December 18, 2001
Tohoku University, Japan
"Status of Accelerator Radiation Safety in Japan"

Nikolai Mokhov, November 1, 2001
Fermi National Accelerator Laboratory
"Recent Progress on the Mars Code and Radiation Studies at Fermilab"



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