DIPAC2011 - List of Keywords (neutron)

Paper	Title	Other Keywords	Page
MOPD03	The Beam Safety System of the PSI UCN Source	target, proton, kicker, power-supply	35
	D. Reggiani, B. Blarer, P.-A. Duperrex, G. Dzieglewski, F. Heinrich, A.C. Mezger, U. Rohrer, K. Thomsen, M. Wohlmuther PSI, Villigen, Switzerland
	At PSI, a new and very intensive Ultra-Cold Neutron (UCN) source based on the spallation principle was commissioned in December 2010 and will start production in 2011. From then on, two neutron spallation sources, the continuous wave SINQ and the macro-pulsed UCN source, both furnished with a solid state target, will be operating concurrently at PSI. The 590 MeV, 1.3 MW proton beam will be switched towards the new spallation target for about 8 s every 800 s. Safe operation of the UCN source is guaranteed by two independent interlock systems. In fact, beside the well established accelerator protection system, a new fast interlock system has been designed following the experience gathered with the MEGAPIE (Megawatt Pilot Target Experiment) project. The goal of this additional system is to preserve the UCN target and the complete beam line installation by ensuring correct beam settings and, at the same time, to avoid any accidental release of radioactive material. After a brief introduction of the PSI UCN source, this paper will focus on the motivations as well as the principle of operation of the UCN beam safety system.
	Poster MOPD03 [3.046 MB]

MOPD42	μ-loss Detector for IFMIF-EVEDA	linac, solenoid, cryomodule, focusing	146
	J. Marroncle, P. Abbon, J. Egberts CEA/DSM/IRFU, France M. Pomorski CEA/DRT/LIST, Gif-sur-Yvette Cedex, France
	For the IFMIF-EVEDA project, a prototype accelerator is being built in Europe and installed at Rokkasho (Japan). It is designed to accelerate 125 mA CW Deuteron to 9 MeV. The very high space charge and high power (1.125 MW) of the beam make this accelerator very challenging. For hands-on maintenance requirements, losses must be well less than 1W/m, i.e. 10^-6 of the beam. That is why, in the 5-9 MeV superconducting Linac, beam dynamics physicists search to tune the beam by minimizing the very external part of the halo. The need is thus to be able to measure very tiny beam losses, called μ-losses, at all the focusing magnets. Only neutrons and γ exit from the beam pipe due to the low deuteron beam energy. Thus such beam loss detectors have to be sensitive to neutrons, but rather insensitive for X-rays and γ to decrease their contributions coming from super-conducting cavity emission. They must be radiation hardness qualified, and capable to work at cryogenic temperature. Single CVD diamonds (4×4×0.5 mm³) are studied for these purposes and first results seem to fulfill the requirements up to now.

TUPD46	Beam Species Fraction Measurement using Doppler Shift Method with FUJIKURA Fiberscope for IFMIF-EVEDA Injector	proton, diagnostics, target, radiation	407
	F. Senée, B. Pottin CEA/DSM/IRFU, France G. Adroit, R. Gobin, O. Tuske CEA/IRFU, Gif-sur-Yvette, France A. Olivier IPN, Orsay, France
	To characterize high intensity ion beam in low energy beam transport line, diagnostics based on residual gas molecule excitation are commonly used. An example is CCD sensors for beam intensity, beam position and beam profile measurements. At CEA/Saclay with the SILHI injector, beam images transports from viewport to sensor have been performed with a fiberscope. Such technique will be used to transport the beam images away from the irradiated zone of the IFMIF-EVEDA tunnel which requires using hardened radiation devices. Indeed, the (D,d) reaction, due to interaction of 140 mA-100 keV deuteron beam with vacuum pipes or scrapers, leads to high neutron and gamma ray flux. As a consequence, in addition to CID cameras for online beam positioning and shape measurements, a 20 m long Fujikura fiberscope has been selected to analyze species fraction using the Doppler shift method. Preliminary measurements have been performed with the SILHI beam to characterize the fiberscope. Its spatial resolution and transmission as well as a CCD sensor and fiberscope comparison are presented. Beam species fractions with and without the use of fiberscope will be also reported.

TUPD60	Optical Diagnostics for Frankfurt Neutron Source	emittance, diagnostics, simulation, factory	443
	H. Reichau, O. Meusel, U. Ratzinger, C. Wagner IAP, Frankfurt am Main, Germany
	A non-interceptive optical diagnostic system on the basis of beam tomography, was developed for the planned Frankfurt Neutron Source (FRANZ). The proton driver linac of FRANZ will provide energies up to 2.0 MeV. The measurement device will non-interceptively derive required beam parameters at the end of the LEBT at beam energies of 120 keV and a current of 200 mA. On a narrow space of 351.2 mm length a rotatable tomography tank will perform a multi-turn tomography with a high and stable vacuum pressure. The tank allows to plug different measurement equipment additionally to the CCD Camera installed, to perform optical beam tomography. A collection of developed algorithms provides information about the density distribution, shape, size, location and emittance on the basis of CCD images. Simulated, as well as measured data have been applied to the evaluation algorithms to test the reliability of the beam. The actual contribution gives an overview on the current diagnostic possibilities of this diagnostic system.
	Poster TUPD60 [1.886 MB]

TUPD94	Monitoring of GeV Deuteron Beam Parameters in ADS Experiments at the Nuclotron (JINR, Dubna)	target, proton, monitoring, synchrotron	530
	A.A. Safronava, A.A. Patapenka JIPNR-Sosny NASB, Minsk, Belarus V.V. Sotnikov, V.A. Voronko NSC/KIPT, Kharkov, Ukraine O. Svoboda NPI, Řež near Prague, Czech Republic W. Westmeier Philipps-Universität, Marburg, Germany
	The quality of beam instrumentation is very important in the experiments on accelerator driven systems (ADS) aiming to investigate spatial and energy distribution of neutrons inside and outside the subcritical setups comprising spallation neutron sources irradiated by relativistic beams. An important source of systematic uncertainties of the experimental data is the inaccuracy of determination of the beam parameters such as total intensity of the extracted beam, beam position at the target, fraction of the beam hitting the target and beam shape. This paper reviews the experimental techniques and measurement tools for deuteron beam monitoring used within the “Energy plus Transmutation” collaboration in the ADS experiments at the accelerator complex of Nuclotron (JINR, Russia): - activation technique using Al monitors for measurement of the total intensity of the extracted beam; - solid nuclear track detectors method and activation technique using segmented activation Cu foils for determination of beam profile and position at the target.
	Poster TUPD94 [13.019 MB]

Paper

Title

Other Keywords

Page

MOPD03

The Beam Safety System of the PSI UCN Source

target, proton, kicker, power-supply

35

D. Reggiani, B. Blarer, P.-A. Duperrex, G. Dzieglewski, F. Heinrich, A.C. Mezger, U. Rohrer, K. Thomsen, M. Wohlmuther
PSI, Villigen, Switzerland

At PSI, a new and very intensive Ultra-Cold Neutron (UCN) source based on the spallation principle was commissioned in December 2010 and will start production in 2011. From then on, two neutron spallation sources, the continuous wave SINQ and the macro-pulsed UCN source, both furnished with a solid state target, will be operating concurrently at PSI. The 590 MeV, 1.3 MW proton beam will be switched towards the new spallation target for about 8 s every 800 s. Safe operation of the UCN source is guaranteed by two independent interlock systems. In fact, beside the well established accelerator protection system, a new fast interlock system has been designed following the experience gathered with the MEGAPIE (Megawatt Pilot Target Experiment) project. The goal of this additional system is to preserve the UCN target and the complete beam line installation by ensuring correct beam settings and, at the same time, to avoid any accidental release of radioactive material. After a brief introduction of the PSI UCN source, this paper will focus on the motivations as well as the principle of operation of the UCN beam safety system.

Poster MOPD03 [3.046 MB]

MOPD42

μ-loss Detector for IFMIF-EVEDA

linac, solenoid, cryomodule, focusing

146

J. Marroncle, P. Abbon, J. Egberts
CEA/DSM/IRFU, France
M. Pomorski
CEA/DRT/LIST, Gif-sur-Yvette Cedex, France

For the IFMIF-EVEDA project, a prototype accelerator is being built in Europe and installed at Rokkasho (Japan). It is designed to accelerate 125 mA CW Deuteron to 9 MeV. The very high space charge and high power (1.125 MW) of the beam make this accelerator very challenging. For hands-on maintenance requirements, losses must be well less than 1W/m, i.e. 10^-6 of the beam. That is why, in the 5-9 MeV superconducting Linac, beam dynamics physicists search to tune the beam by minimizing the very external part of the halo. The need is thus to be able to measure very tiny beam losses, called μ-losses, at all the focusing magnets. Only neutrons and γ exit from the beam pipe due to the low deuteron beam energy. Thus such beam loss detectors have to be sensitive to neutrons, but rather insensitive for X-rays and γ to decrease their contributions coming from super-conducting cavity emission. They must be radiation hardness qualified, and capable to work at cryogenic temperature. Single CVD diamonds (4×4×0.5 mm³) are studied for these purposes and first results seem to fulfill the requirements up to now.

TUPD46

Beam Species Fraction Measurement using Doppler Shift Method with FUJIKURA Fiberscope for IFMIF-EVEDA Injector

proton, diagnostics, target, radiation

407

F. Senée, B. Pottin
CEA/DSM/IRFU, France
G. Adroit, R. Gobin, O. Tuske
CEA/IRFU, Gif-sur-Yvette, France
A. Olivier
IPN, Orsay, France

To characterize high intensity ion beam in low energy beam transport line, diagnostics based on residual gas molecule excitation are commonly used. An example is CCD sensors for beam intensity, beam position and beam profile measurements. At CEA/Saclay with the SILHI injector, beam images transports from viewport to sensor have been performed with a fiberscope. Such technique will be used to transport the beam images away from the irradiated zone of the IFMIF-EVEDA tunnel which requires using hardened radiation devices. Indeed, the (D,d) reaction, due to interaction of 140 mA-100 keV deuteron beam with vacuum pipes or scrapers, leads to high neutron and gamma ray flux. As a consequence, in addition to CID cameras for online beam positioning and shape measurements, a 20 m long Fujikura fiberscope has been selected to analyze species fraction using the Doppler shift method. Preliminary measurements have been performed with the SILHI beam to characterize the fiberscope. Its spatial resolution and transmission as well as a CCD sensor and fiberscope comparison are presented. Beam species fractions with and without the use of fiberscope will be also reported.

TUPD60

Optical Diagnostics for Frankfurt Neutron Source

emittance, diagnostics, simulation, factory

443

H. Reichau, O. Meusel, U. Ratzinger, C. Wagner
IAP, Frankfurt am Main, Germany

A non-interceptive optical diagnostic system on the basis of beam tomography, was developed for the planned Frankfurt Neutron Source (FRANZ). The proton driver linac of FRANZ will provide energies up to 2.0 MeV. The measurement device will non-interceptively derive required beam parameters at the end of the LEBT at beam energies of 120 keV and a current of 200 mA. On a narrow space of 351.2 mm length a rotatable tomography tank will perform a multi-turn tomography with a high and stable vacuum pressure. The tank allows to plug different measurement equipment additionally to the CCD Camera installed, to perform optical beam tomography. A collection of developed algorithms provides information about the density distribution, shape, size, location and emittance on the basis of CCD images. Simulated, as well as measured data have been applied to the evaluation algorithms to test the reliability of the beam. The actual contribution gives an overview on the current diagnostic possibilities of this diagnostic system.

Poster TUPD60 [1.886 MB]

TUPD94

Monitoring of GeV Deuteron Beam Parameters in ADS Experiments at the Nuclotron (JINR, Dubna)

target, proton, monitoring, synchrotron

530

A.A. Safronava, A.A. Patapenka
JIPNR-Sosny NASB, Minsk, Belarus
V.V. Sotnikov, V.A. Voronko
NSC/KIPT, Kharkov, Ukraine
O. Svoboda
NPI, Řež near Prague, Czech Republic
W. Westmeier
Philipps-Universität, Marburg, Germany

The quality of beam instrumentation is very important in the experiments on accelerator driven systems (ADS) aiming to investigate spatial and energy distribution of neutrons inside and outside the subcritical setups comprising spallation neutron sources irradiated by relativistic beams. An important source of systematic uncertainties of the experimental data is the inaccuracy of determination of the beam parameters such as total intensity of the extracted beam, beam position at the target, fraction of the beam hitting the target and beam shape. This paper reviews the experimental techniques and measurement tools for deuteron beam monitoring used within the “Energy plus Transmutation” collaboration in the ADS experiments at the accelerator complex of Nuclotron (JINR, Russia): - activation technique using Al monitors for measurement of the total intensity of the extracted beam; - solid nuclear track detectors method and activation technique using segmented activation Cu foils for determination of beam profile and position at the target.

Poster TUPD94 [13.019 MB]