IBIC2014 - List of Keywords (factory)

Paper	Title	Other Keywords	Page
MOPF04	RHIC Injection Transport Beam Emittance Measurements	emittance, background, proton, extraction	45
	J.Y. Huang Duke University, Durham, North Carolina, USA D.M. Gassner, M.G. Minty, S. Tepikian, P. Thieberger, N. Tsoupas, C.M. Zimmer BNL, Upton, Long Island, New York, USA
	The Alternating Gradient Synchrotron (AGS)-to-Relativistic Heavy Ion Collider (RHIC) transfer line, abbreviated AtR, is an integral component for the transfer of proton and heavy ion bunches from the AGS to RHIC. In this study, using 23.8 GeV proton beams, we focused on factors that may affect the accuracy of emittance measurements that provide information on the quality of the beam injected into RHIC. The method of emittance measurement uses fluorescent screens in the AtR. The factors that may affect the measurement are: background noise, calibration, resolution, and dispersive corrections. Ideal video Offset (black level, brightness) and Gain (contrast) settings were determined for consistent initial conditions in the Flag Profile Monitor (FPM) application. Using this information, we also updated spatial calibrations for the FPM using corresponding fiducial markings and sketches. Resolution error was determined using the Modulation Transfer Function amplitude. To measure the contribution of the beam’s dispersion, we conducted a scan of beam position and size at relevant Beam Position Monitors (BPMs) and Video Profile Monitors (VPMs, or “flags”) by varying the extraction energy with a scan of the RF frequency in the AGS. The combined effects of these factors resulted in slight variations in emittance values, with further analysis suggesting potential discrepancies in the current model of the beam line’s focusing properties. In the process of testing various contributing factors, a system of checks has been established for future studies, providing an efficient, standardized, and reproducible procedure that might encourage greater reliance on the transfer line’s emittance and beam parameter measurements.
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TUPF14	Newly Developed 6mm Buttons for the BPMs in the ESRF Low-Emittance-Ring	coupling, simulation, vacuum, operation	346
	K.B. Scheidt ESRF, Grenoble, France
	For the small beam pipe of the BPMs in the LE-ring a development of 6mm button-UHV-feedthroughs was launched and has resulted in the delivery of a total of 27 prototypes from both the Kyocera and the PMB-ALCEN companies. These buttons are flat, without skirt, with a central pin of Molybdenum ending in a male SMA connector. Among these prototype units are versions with Copper, Steel and Molybdenum material for the button itself, with the aim of assessing possible different heatload issues. All design considerations, that are compatible with a further button reduction to 4mm, will be presented next to issues of costs, mechanical tolerances and feasibility.
	Poster TUPF14 [1.420 MB]
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WEPF23	Dosimetric Verification of Lateral Profile with a Unique Ionization Chamber in Therapeutic Ion Beams	ion, target, proton, scattering	597
	Y. Hara, T. Furukawa, K. Mizushima, K. Noda, N. S. Saotome, T. Shirai, R. Tansho NIRS, Chiba-shi, Japan Y. Saraya National Institute of Radiological Sciences, Chiba, Japan
	It is essential to consider large-angle scattered particles in dose calculation models for therapeutic ion beams. However, it is difﬁcult to measure the small dose contribution from large-angle scattered particles. Therefore, we developed a parallel-plate ionization chamber consisting of concentric electrodes (ICCE) to efﬁciently and easily detect small contributions. The ICCE consists of two successive ICs with a common HV plate. The former is a large plane-parallel IC to measure dose distribution integrated over the whole plane, the latter is a 24-channel parallel-plate IC with concentric electrodes to derive the characteristic parameters describing the lateral beam spread. The aim of this study is to evaluate the performance of the ICCE. By taking advantage of the characteristic of ICCE, we studied the recombination associated with lateral beam profile. Also, we measured carbon pencil beam in several different media by using ICCE. As a result, we confirmed the ICCE could be used as a useful tool to determine the characterization of the therapeutic ion beams.
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WEPF30	Study of General Ion Recombination for Beam Monitor used in Particle Radiotherapy	ion, detector, cathode, controls	620
	R. Tansho, T. Furukawa, Y. Hara, K. Mizushima, K. Noda, N. S. Saotome, T. Shirai NIRS, Chiba-shi, Japan Y. Saraya National Institute of Radiological Sciences, Chiba, Japan
	Heavy ion particles such as carbon ion beams are effective tools for cancer radiotherapy because of the higher dose localization and biological effectiveness by using the characteristic dose distribution with the Bragg peak. In the particle radiotherapy, it is important to conform a dose distribution and deliver prescribed dose to a tumor. An ionization chamber is usually used as a beam monitor to control the prescribed dose to the target. Then new treatment research facility at National Institute of Radiological Science (NIRS) uses beam scanning irradiation system that make uniform dose distribution in the target volume by superposing dose deposit of an individual pencil beam. In order to increase dose concentration to the target and also decrease irradiation time, it is necessary to minimize the pencil beam size and to increase the beam intensity. As the result, the localization of the pencil beam with high intensity increases the number of general ion recombination in the beam monitor. Therefore, we need to predict the ion recombination rate in the beam monitor for accurate control of the dose. For our purpose, we developed calculation code to predict the ion recombination rate when the pencil beam scanning is used. The calculation code can divide a pencil beam into a sub region and calculate ion recombination rate in each sub region by using Boag theory. We present the calculation results compared with measurements for verification of our calculation code.
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Paper

Title

Other Keywords

Page

MOPF04

RHIC Injection Transport Beam Emittance Measurements

emittance, background, proton, extraction

45

J.Y. Huang
Duke University, Durham, North Carolina, USA
D.M. Gassner, M.G. Minty, S. Tepikian, P. Thieberger, N. Tsoupas, C.M. Zimmer
BNL, Upton, Long Island, New York, USA

The Alternating Gradient Synchrotron (AGS)-to-Relativistic Heavy Ion Collider (RHIC) transfer line, abbreviated AtR, is an integral component for the transfer of proton and heavy ion bunches from the AGS to RHIC. In this study, using 23.8 GeV proton beams, we focused on factors that may affect the accuracy of emittance measurements that provide information on the quality of the beam injected into RHIC. The method of emittance measurement uses fluorescent screens in the AtR. The factors that may affect the measurement are: background noise, calibration, resolution, and dispersive corrections. Ideal video Offset (black level, brightness) and Gain (contrast) settings were determined for consistent initial conditions in the Flag Profile Monitor (FPM) application. Using this information, we also updated spatial calibrations for the FPM using corresponding fiducial markings and sketches. Resolution error was determined using the Modulation Transfer Function amplitude. To measure the contribution of the beam’s dispersion, we conducted a scan of beam position and size at relevant Beam Position Monitors (BPMs) and Video Profile Monitors (VPMs, or “flags”) by varying the extraction energy with a scan of the RF frequency in the AGS. The combined effects of these factors resulted in slight variations in emittance values, with further analysis suggesting potential discrepancies in the current model of the beam line’s focusing properties. In the process of testing various contributing factors, a system of checks has been established for future studies, providing an efficient, standardized, and reproducible procedure that might encourage greater reliance on the transfer line’s emittance and beam parameter measurements.

Export •

reference for this paper to ※ LaTeX, ※ Text, ※ IS/RefMan, ※ EndNote (xml)

TUPF14

Newly Developed 6mm Buttons for the BPMs in the ESRF Low-Emittance-Ring

coupling, simulation, vacuum, operation

346

K.B. Scheidt
ESRF, Grenoble, France

For the small beam pipe of the BPMs in the LE-ring a development of 6mm button-UHV-feedthroughs was launched and has resulted in the delivery of a total of 27 prototypes from both the Kyocera and the PMB-ALCEN companies. These buttons are flat, without skirt, with a central pin of Molybdenum ending in a male SMA connector. Among these prototype units are versions with Copper, Steel and Molybdenum material for the button itself, with the aim of assessing possible different heatload issues. All design considerations, that are compatible with a further button reduction to 4mm, will be presented next to issues of costs, mechanical tolerances and feasibility.

Poster TUPF14 [1.420 MB]

Export •

reference for this paper to ※ LaTeX, ※ Text, ※ IS/RefMan, ※ EndNote (xml)

WEPF23

Dosimetric Verification of Lateral Profile with a Unique Ionization Chamber in Therapeutic Ion Beams

ion, target, proton, scattering

597

Y. Hara, T. Furukawa, K. Mizushima, K. Noda, N. S. Saotome, T. Shirai, R. Tansho
NIRS, Chiba-shi, Japan
Y. Saraya
National Institute of Radiological Sciences, Chiba, Japan

It is essential to consider large-angle scattered particles in dose calculation models for therapeutic ion beams. However, it is difﬁcult to measure the small dose contribution from large-angle scattered particles. Therefore, we developed a parallel-plate ionization chamber consisting of concentric electrodes (ICCE) to efﬁciently and easily detect small contributions. The ICCE consists of two successive ICs with a common HV plate. The former is a large plane-parallel IC to measure dose distribution integrated over the whole plane, the latter is a 24-channel parallel-plate IC with concentric electrodes to derive the characteristic parameters describing the lateral beam spread. The aim of this study is to evaluate the performance of the ICCE. By taking advantage of the characteristic of ICCE, we studied the recombination associated with lateral beam profile. Also, we measured carbon pencil beam in several different media by using ICCE. As a result, we confirmed the ICCE could be used as a useful tool to determine the characterization of the therapeutic ion beams.

Export •

reference for this paper to ※ LaTeX, ※ Text, ※ IS/RefMan, ※ EndNote (xml)

WEPF30

Study of General Ion Recombination for Beam Monitor used in Particle Radiotherapy

ion, detector, cathode, controls

620

R. Tansho, T. Furukawa, Y. Hara, K. Mizushima, K. Noda, N. S. Saotome, T. Shirai
NIRS, Chiba-shi, Japan
Y. Saraya
National Institute of Radiological Sciences, Chiba, Japan

Heavy ion particles such as carbon ion beams are effective tools for cancer radiotherapy because of the higher dose localization and biological effectiveness by using the characteristic dose distribution with the Bragg peak. In the particle radiotherapy, it is important to conform a dose distribution and deliver prescribed dose to a tumor. An ionization chamber is usually used as a beam monitor to control the prescribed dose to the target. Then new treatment research facility at National Institute of Radiological Science (NIRS) uses beam scanning irradiation system that make uniform dose distribution in the target volume by superposing dose deposit of an individual pencil beam. In order to increase dose concentration to the target and also decrease irradiation time, it is necessary to minimize the pencil beam size and to increase the beam intensity. As the result, the localization of the pencil beam with high intensity increases the number of general ion recombination in the beam monitor. Therefore, we need to predict the ion recombination rate in the beam monitor for accurate control of the dose. For our purpose, we developed calculation code to predict the ion recombination rate when the pencil beam scanning is used. The calculation code can divide a pencil beam into a sub region and calculate ion recombination rate in each sub region by using Boag theory. We present the calculation results compared with measurements for verification of our calculation code.

Export •

reference for this paper to ※ LaTeX, ※ Text, ※ IS/RefMan, ※ EndNote (xml)