HB2012 - List of Keywords (radiation)

Paper	Title	Other Keywords	Page
MOP223	Radiation Safety System for PKUNIFTY Project	neutron, shielding, power-supply, controls	112
	J. Zhao, J.E. Chen, Z.Y. Guo, Y.R. Lu, S.X. Peng PKU, Beijing, People's Republic of China J. Zhao, Q.F. Zhou State Key Laboratory of Nuclear Physics and Technology, Beijing, Haidian District, People's Republic of China
	PKUNIFTY (Peking University Neutron Imaging FaciliTY) , which is based on a 2 MeV RFQ accelerator-driven compact neutron sourse with an expected fast-neutron yield of 2.9*1012n/s via the deuteron-beryllium reaction, has been operated this year. A radiation safety system for PKUNIFTY, that protects personnel from radiation hazards has been built and run since last year, is described. It consists of a shielding optimized with Monte-Carlo simulation, a dose interlock system, an alternative interlock with another 4.5MV tandem accelerator facility, and a video monitoring system. The dose of supervision area is less than 0.5μSv/h during beam operation.

TUO1B04	Beam Loss Control for the Fermilab Main Injector	collimation, injection, booster, quadrupole	264
	B.C. Brown Fermilab, Batavia, USA
	Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy. From 2005 through 2012, the Fermilab Main Injector provided intense beams of 120 GeV protons to produce neutrino beams and antiprotons. Hardware improvements in conjunction with improved diagnostics allowed the system to reach sustained operation at ~400 kW beam power. Losses were at or near the 8 GeV injection energy where 95\% beam transmission results in about 1.5 kW of beam loss. By minimizing and localizing loss, residual radiation levels fell while beam power was doubled. Lost beam was directed to either the collimation system or to the beam abort. Critical apertures were increased while improved instrumentation allowed optimal use of available apertures. We will summarize the impact of various loss control tools and the status and trends in residual radiation in the Main Injector.
	Slides TUO1B04 [1.356 MB]

WEO3A04	Current and Planned High Proton Flux Operations at the FNAL Booster	booster, proton, extraction, kicker	378
	F.G.G. Garcia, W. Pellico Fermilab, Batavia, USA
	Funding: Department of Energy - Office of High Energy Physics The Fermi Lab Proton Source has seen a dramatic increase in requested flux this past decade. An increase of over ten fold in hourly flux was necessary to meet the FNAL HEP experimental requirements. This next decade will be just as challenging as the lab's HEP planning will again require the Proton Source to double the hourly flux. The recent achievements were accomplished with major upgrades such a collimation system, new correctors and aperture improvements. To achieve the next level of proton delivery rates will require even more improvements. A five year Proton Improvement Plan (PIP) is currently underway with a goal to maintain 2012 activation levels while doubling the hourly flux. Tasks in the PIP to help reduce losses include an improved beam notching system, cogging, aperture improvement and beam emittances control and reduction. This talk will describe current conditions and plans to mitigate losses with the planned increase in proton throughput.
	Slides WEO3A04 [8.309 MB]

WEO3C04	Long Baseline Neutrino Experiment Target Material Radiation Damage Studies Using Energetic Protons of the Brookhaven Linear Isotope Production (BLIP) Facility	proton, target, lattice, neutron	471
	N. Simos BNL, Upton, Long Island, New York, USA P. Hurh Fermilab, Batavia, USA Z. Kotsina NCSR Demokritos, Attiki, Greece
	One of the future multi-MW accelerators is the LBNE Experiment where Fermilab plans to produce a beam of neutrinos with a 2.3 MW proton beam as part of a suite of experiments associated with ProjectX. Specifically, the LBNE Neutrino Beam Facility aims for a 2⁺ MW, 60-120 GeV pulsed,high intensity proton beam produced in the ProjectX accelerator intercepted by a low Z solid target to facilitate the production of low energy neutrinos. The multi-MW level LBNE proton beam will be characterized by intensities of the order of 1.6·10⁺¹⁴ p/pulse, σ_radius of 1.5-3.5 mm and a 9.8 μs pulse length. These parameters are expected to push many target materials to their limit thus making the target design very challenging. Recent experience from operating high intensity beams on targets have indicated that several critical design issues exist namely thermal shock,heat removal, radiation damage,radiation accelerated corrosion effects,and residual radiation within the target envelope. A series of experimental studies on radiation damage and thermal shock response conducted at BNL and focusing on low-Z materials have unraveled potential issues regarding the damageability from energetic particle beams which may differ significantly from thermal reactor experience. Irradiation damage results for low-Z materials associated with the LBNE and other high power experiments will be presented.
	Slides WEO3C04 [3.965 MB]

WEO3C06	Understanding Ion Induced Radiation Damage in Target Materials	target, ion, heavy-ion, controls	476
	M. Tomut, C.L. Hubert GSI, Darmstadt, Germany M. Tomut INFIM, Bucharest, Romania
	Successful operation of next generations of radioactive beam facilities depends on the target survival in conditions of intense radiation field and thermo-mechanical solicitations induced by the driving ion beam. Material property degradation due to ion- beam induced damage will limit target lifetime, either by affecting target performance or, by reducing the material resilience. Similar problems are faced by beam protection elements at LHC. Understanding the mechanism of radiation damage induced by ion beam in these materials provides valuable knowledge for lifetime prediction and for the efforts to mitigate performance degradation. On their way through the target material, energetic heavy ions induce a trail of ionizations and excitations, resulting in formation of ion tracks consisting of complex defect structures. We give a review on the ion-induced damage creation in high power target materials, on the structural and thermo-mechanical property degradation and on their recovery in high temperature irradiation experiments.
	Slides WEO3C06 [4.439 MB]

THO1B02	Test of Optical Stochastic Cooling in Fermilab	damping, kicker, optics, pick-up	514
	V.A. Lebedev Fermilab, Batavia, USA M.S. Zolotorev LBNL, Berkeley, California, USA
	A new 150 MeV electron storage ring is planned to be build in Fermilab. The construction of new machine pursues two goals a test of highly non-linear integrable optics and a test of optical stochastic cooling (OSC). This paper discusses details of OSC arrangements and choice of major parameters of the cooling scheme. At the first step the cooling will be achieved without optical amplifier. It should introduce the damping rates of about 1 order of magnitudes higher than the cooling rates due to synchrotron radiation. Similar scheme looks as a promising technique for the LHC luminosity upgrade. Its details are also discussed.
	Slides THO1B02 [1.109 MB]

THO3C01	Optical Transition Radiation for Non-relativistic Ion Beams	ion, target, photon, electron	580
	B. Walasek-Höhne, C.A. Andre, F. Becker, P. Forck, A. Reiter, M. Schwickert, R. Singh GSI, Darmstadt, Germany A.H. Lumpkin Fermilab, Batavia, USA
	In this contribution, recent results of Optical Transition Radiation (OTR) measurements with a non-relativistic heavy-ion beam will be presented. This feasibility study was prompted by previous measurements [1] and the theoretical estimation of expected signal strengths for the GSI linear accelerator UNILAC. For this experiment, an 11.4 MeV/u Uranium beam was chosen to investigate OTR signal from several target materials and to evaluate the working regime for the used experimental setup. The OTR light was either observed directly with an Image Intensified CCD camera (ICCD) or indirectly via a spectrometer for wavelength resolved data. A moveable stripping foil allowed measurements with two different ion charge states. The theoretical q2 dependency of the OTR process predicts a six-fold increase in light yield which was confirmed experimentally. Obtained OTR beam profiles were compered to SEM-Grid data. Moreover, ICCD gating feature, as well as the emitted light spectrum ruled out contribution of any background sources with longer emission time constant e.g. blackbody radiation. [1] C. Bal et al., "OTR from Non-relativistic Electrons", Proceedings of DIPAC03, PM04, Mainz Germany.
	Slides THO3C01 [1.905 MB]

THO3C05	Fiber Based BLM System Research and Development at CERN	photon, beam-losses, electron, quadrupole	596
	S. Mallows The University of Liverpool, Liverpool, United Kingdom E.B. Holzer, S. Mallows, J.W. van Hoorne CERN, Geneva, Switzerland
	The application of a beam loss measurement (BLM) system based on Cherenkov light generated in optical fibers to a linear accelerator with long bunch trains is currently under investigation at CERN. In the context of the Compact Linear Collider (CLIC) study, the machine protection role of the BLM system consists of its input to the \lqnext cycle permit\rq. In between two cycles it is determined whether it is safe to commit the machine for the next cycle. A model for light production and propagation has been developed and validated with beam measurements. Monte Carlo simulations of loss scenarios established the suitability in terms of sensitivity and dynamic range. The achievable longitudinal position resolution of the system, considering that the bunch trains and the optical fiber length are comparable in size is discussed.
	Slides THO3C05 [3.846 MB]

Paper

Title

Other Keywords

Page

MOP223

Radiation Safety System for PKUNIFTY Project

neutron, shielding, power-supply, controls

112

J. Zhao, J.E. Chen, Z.Y. Guo, Y.R. Lu, S.X. Peng
PKU, Beijing, People's Republic of China
J. Zhao, Q.F. Zhou
State Key Laboratory of Nuclear Physics and Technology, Beijing, Haidian District, People's Republic of China

PKUNIFTY (Peking University Neutron Imaging FaciliTY) , which is based on a 2 MeV RFQ accelerator-driven compact neutron sourse with an expected fast-neutron yield of 2.9*1012n/s via the deuteron-beryllium reaction, has been operated this year. A radiation safety system for PKUNIFTY, that protects personnel from radiation hazards has been built and run since last year, is described. It consists of a shielding optimized with Monte-Carlo simulation, a dose interlock system, an alternative interlock with another 4.5MV tandem accelerator facility, and a video monitoring system. The dose of supervision area is less than 0.5μSv/h during beam operation.

TUO1B04

Beam Loss Control for the Fermilab Main Injector

collimation, injection, booster, quadrupole

264

B.C. Brown
Fermilab, Batavia, USA

Funding: Operated by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the United States Department of Energy.
From 2005 through 2012, the Fermilab Main Injector provided intense beams of 120 GeV protons to produce neutrino beams and antiprotons. Hardware improvements in conjunction with improved diagnostics allowed the system to reach sustained operation at ~400 kW beam power. Losses were at or near the 8 GeV injection energy where 95\% beam transmission results in about 1.5 kW of beam loss. By minimizing and localizing loss, residual radiation levels fell while beam power was doubled. Lost beam was directed to either the collimation system or to the beam abort. Critical apertures were increased while improved instrumentation allowed optimal use of available apertures. We will summarize the impact of various loss control tools and the status and trends in residual radiation in the Main Injector.

Slides TUO1B04 [1.356 MB]

WEO3A04

Current and Planned High Proton Flux Operations at the FNAL Booster

booster, proton, extraction, kicker

378

F.G.G. Garcia, W. Pellico
Fermilab, Batavia, USA

Funding: Department of Energy - Office of High Energy Physics
The Fermi Lab Proton Source has seen a dramatic increase in requested flux this past decade. An increase of over ten fold in hourly flux was necessary to meet the FNAL HEP experimental requirements. This next decade will be just as challenging as the lab's HEP planning will again require the Proton Source to double the hourly flux. The recent achievements were accomplished with major upgrades such a collimation system, new correctors and aperture improvements. To achieve the next level of proton delivery rates will require even more improvements. A five year Proton Improvement Plan (PIP) is currently underway with a goal to maintain 2012 activation levels while doubling the hourly flux. Tasks in the PIP to help reduce losses include an improved beam notching system, cogging, aperture improvement and beam emittances control and reduction. This talk will describe current conditions and plans to mitigate losses with the planned increase in proton throughput.

Slides WEO3A04 [8.309 MB]

WEO3C04

Long Baseline Neutrino Experiment Target Material Radiation Damage Studies Using Energetic Protons of the Brookhaven Linear Isotope Production (BLIP) Facility

proton, target, lattice, neutron

471

N. Simos
BNL, Upton, Long Island, New York, USA
P. Hurh
Fermilab, Batavia, USA
Z. Kotsina
NCSR Demokritos, Attiki, Greece

One of the future multi-MW accelerators is the LBNE Experiment where Fermilab plans to produce a beam of neutrinos with a 2.3 MW proton beam as part of a suite of experiments associated with ProjectX. Specifically, the LBNE Neutrino Beam Facility aims for a 2⁺ MW, 60-120 GeV pulsed,high intensity proton beam produced in the ProjectX accelerator intercepted by a low Z solid target to facilitate the production of low energy neutrinos. The multi-MW level LBNE proton beam will be characterized by intensities of the order of 1.6·10⁺¹⁴ p/pulse, σ_radius of 1.5-3.5 mm and a 9.8 μs pulse length. These parameters are expected to push many target materials to their limit thus making the target design very challenging. Recent experience from operating high intensity beams on targets have indicated that several critical design issues exist namely thermal shock,heat removal, radiation damage,radiation accelerated corrosion effects,and residual radiation within the target envelope. A series of experimental studies on radiation damage and thermal shock response conducted at BNL and focusing on low-Z materials have unraveled potential issues regarding the damageability from energetic particle beams which may differ significantly from thermal reactor experience. Irradiation damage results for low-Z materials associated with the LBNE and other high power experiments will be presented.

Slides WEO3C04 [3.965 MB]

WEO3C06

Understanding Ion Induced Radiation Damage in Target Materials

target, ion, heavy-ion, controls

476

M. Tomut, C.L. Hubert
GSI, Darmstadt, Germany
M. Tomut
INFIM, Bucharest, Romania

Successful operation of next generations of radioactive beam facilities depends on the target survival in conditions of intense radiation field and thermo-mechanical solicitations induced by the driving ion beam. Material property degradation due to ion- beam induced damage will limit target lifetime, either by affecting target performance or, by reducing the material resilience. Similar problems are faced by beam protection elements at LHC. Understanding the mechanism of radiation damage induced by ion beam in these materials provides valuable knowledge for lifetime prediction and for the efforts to mitigate performance degradation. On their way through the target material, energetic heavy ions induce a trail of ionizations and excitations, resulting in formation of ion tracks consisting of complex defect structures. We give a review on the ion-induced damage creation in high power target materials, on the structural and thermo-mechanical property degradation and on their recovery in high temperature irradiation experiments.

Slides WEO3C06 [4.439 MB]

THO1B02

Test of Optical Stochastic Cooling in Fermilab

damping, kicker, optics, pick-up

514

V.A. Lebedev
Fermilab, Batavia, USA
M.S. Zolotorev
LBNL, Berkeley, California, USA

A new 150 MeV electron storage ring is planned to be build in Fermilab. The construction of new machine pursues two goals a test of highly non-linear integrable optics and a test of optical stochastic cooling (OSC). This paper discusses details of OSC arrangements and choice of major parameters of the cooling scheme. At the first step the cooling will be achieved without optical amplifier. It should introduce the damping rates of about 1 order of magnitudes higher than the cooling rates due to synchrotron radiation. Similar scheme looks as a promising technique for the LHC luminosity upgrade. Its details are also discussed.

Slides THO1B02 [1.109 MB]

THO3C01

Optical Transition Radiation for Non-relativistic Ion Beams

ion, target, photon, electron

580

B. Walasek-Höhne, C.A. Andre, F. Becker, P. Forck, A. Reiter, M. Schwickert, R. Singh
GSI, Darmstadt, Germany
A.H. Lumpkin
Fermilab, Batavia, USA

In this contribution, recent results of Optical Transition Radiation (OTR) measurements with a non-relativistic heavy-ion beam will be presented. This feasibility study was prompted by previous measurements [1] and the theoretical estimation of expected signal strengths for the GSI linear accelerator UNILAC. For this experiment, an 11.4 MeV/u Uranium beam was chosen to investigate OTR signal from several target materials and to evaluate the working regime for the used experimental setup. The OTR light was either observed directly with an Image Intensified CCD camera (ICCD) or indirectly via a spectrometer for wavelength resolved data. A moveable stripping foil allowed measurements with two different ion charge states. The theoretical q2 dependency of the OTR process predicts a six-fold increase in light yield which was confirmed experimentally. Obtained OTR beam profiles were compered to SEM-Grid data. Moreover, ICCD gating feature, as well as the emitted light spectrum ruled out contribution of any background sources with longer emission time constant e.g. blackbody radiation.
[1] C. Bal et al., "OTR from Non-relativistic Electrons", Proceedings of DIPAC03, PM04, Mainz Germany.

Slides THO3C01 [1.905 MB]

THO3C05

Fiber Based BLM System Research and Development at CERN

photon, beam-losses, electron, quadrupole

596

S. Mallows
The University of Liverpool, Liverpool, United Kingdom
E.B. Holzer, S. Mallows, J.W. van Hoorne
CERN, Geneva, Switzerland

The application of a beam loss measurement (BLM) system based on Cherenkov light generated in optical fibers to a linear accelerator with long bunch trains is currently under investigation at CERN. In the context of the Compact Linear Collider (CLIC) study, the machine protection role of the BLM system consists of its input to the \lqnext cycle permit\rq. In between two cycles it is determined whether it is safe to commit the machine for the next cycle. A model for light production and propagation has been developed and validated with beam measurements. Monte Carlo simulations of loss scenarios established the suitability in terms of sensitivity and dynamic range. The achievable longitudinal position resolution of the system, considering that the bunch trains and the optical fiber length are comparable in size is discussed.

Slides THO3C05 [3.846 MB]