Techniques for intense-proton-beam profile measurements

Gilpatrick, J.D.

doi:10.1063/1.57046

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…Such a diagnostic is planned for the low-energy linac of the APT [3]. At low energy, it is expected that the proton beam will interact with the background gas and produce sufficient fluorescence to be observed with an intensified camera.…”

Section: Introductionmentioning

confidence: 99%

Initial operation of the LEDA beam-induced fluorescence diagnostic

Kamperschroer¹,

Gilpatrick²,

Gurd³

et al. 2000

AIP Conference Proceedings

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Abstract.A diagnostic based on beam-induced fluorescence has been developed and used to examine the expanded beam in the High-Energy Beam Transport (HEBT) section of the Low Energy Demonstration Accelerator (LEDA). The system consists of a camera, a gas injector, a spectrometer, and a control system. Gas is injected to provide a medium for the beam to excite, the camera captures the resulting image of the fluorescing gas, and the spectrometer measures the spectrum of the emitted light. EPICS was used to control the camera and acquire and store images. Data analysis is presently being performed offline. A Kodak DCS420m professional CCD camera is the primary component of the optical system. InterScience, Inc. modified the camera with the addition of a gain of 4000 image intensifier, thereby producing an intensified camera with a sensitivity of ~0.5 milli-lux. Light is gathered with a 1" format, 16-160 mm, Computar zoom lens. This lens is attached to the camera via a Century Precision Optics relay lens. Images obtained using only hydrogen from the beam stop exhibited features not yet understood. Images with good signal-to-noise ratio were obtained with the injection of sufficient nitrogen to raise the HEBT pressure to 2-8x10 -6 torr. Two strong nitrogen lines, believed to be of the first negative group of N 2 + , were identified at 391 and 428 nm.

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Section: Introductionmentioning

confidence: 99%

Initial operation of the LEDA beam-induced fluorescence diagnostic

Kamperschroer¹,

Gilpatrick²,

Gurd³

et al. 2000

AIP Conference Proceedings

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“…According to Gilpatrick [6] CERN had linear wire scanners operating in the Large Electron Positron Collider (LEP), with speed between 0.1 to 2 m/s, using different materials for the wire, 36 µm C, 10 µm SiC, and 7 µm SiO2. Also Gilpatrick explains that CERN at that time operated rotatory wire scanners using 30 µm carbon fiber and wire translation velocities of 10 to 20 meters per second.…”

Section: Type Of Displacementmentioning

confidence: 99%

“…Igarashi [6] presents a good overview of the scanners operating at KEK PS main ring. According to Igarashi the technology used in this scanner is based on CERN fast wire scanners.…”

Section: Type Of Displacementmentioning

confidence: 99%

Minimisation of the wire position uncertainties of the new CERN vacuum wire scanner

Herranz Alvarez

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The particle production of an accelerator is characterised by the accelerated species of particles, by their number and energy. The particle rate is determined by the production cross section, a natural constant and the accelerator dependent parameter luminosity. The luminosity is proportional to the number of particles in each beam and inversely proportional to the particle beam transverse dimensions. The luminosity increases with the particle beam density and therefore the probability of interactions too. To optimize the transverse beam sizes, profile monitors are used to measure parameter depending changes. Different monitors can provide beam transversal profile measurements (Wire Scanners, Synchrotron Light Monitors, Rest Gas Profile Monitors), however the wire scanner monitor is considered to be the most accurate of all monitors. Wire scanner instruments measure the transverse beam density profile in a particle accelerator by means of moving a thin wire in an intermittent manner. In the next years the luminosity of the Large Hadron Collider (LHC) will be significantly increased and more accurate beam profile measurement will necessary. The new performance demands a wire travelling speed up to 20 m.s-1 and a position measurement accuracy of the order of few micros. The existing wire scanners does not reach the new requirements as their accuracy achieved is limited by the motorization, the angular position measurement system located outside of the vacuum vessels and the vibration of the thin carbon wire which has been identified as one of the major error sources reducing the knowledge of the wire position. Therefore the development of a new device whose accuracy meets the new requirements was mandatory. This thesis work aims to provide suitable inputs for the design and operation of this new fast wire scanner in order to minimize the uncertainties in the wire position. To accomplish the aims the understanding of the wire vibrations in such a system is one of the main goals of this work. More specifically, the development of a suitable vibration measurement system and the construction of dynamic models of the system are the two goals aimed. For the new scanner design this work intend to propose, the conceptual design, the optimization of the most critical parts and the operation procedure that will allow the new device to reach the required performances imposed by the forthcoming LHC conditions. La producción de partículas de un acelerador se caracteriza por las especies de partículas aceleradas, por su número y energía. La tasa de partículas se determina a partir de la sección transversal de producción, una constante natural, y de un parámetro que depende del acelerador, la luminosidad. La luminosidad es proporcional al número de partículas por haz e inversamente proporcional a la dimensión transversal de los haces. La luminosidad aumenta con la densidad de partículas y por lo tanto también aumenta la probabilidad de interacciones entre los haces. Para optimizar la sección trasversal del haz, se utilizan monitores de perfil de haz. Diversos tipos de monitores pueden proporcionar mediciones del perfil transversal del haz (Escáneres de hilo, Monitores de luz de sincrotrón, Monitores de análisis de gas residual), sin embargo el escáner de hilo está considerado como el más preciso de todos ellos. Los escáneres de hilo miden el perfil del haz atravesándolo con un hilo muy delgado de manera intermitente. En los próximos años la luminosidad del Gran Colisionador de Hadrones (LHC) se incrementará de manera significativa, por lo que serán necesarios sistemas de medida de perfil de haz más precisos que lo actuales. Las nuevas características, requerirán velocidad de desplazamiento del hilo de hasta 20 ms-1 y una precisión en la medida de posición del hilo de tan solo unas micras. Los escáneres actuales no pueden alcanzar estos requerimientos ya que su precisión está limitada por el sistema de motorización, por el medidor angular de posición que está situado fuera del tanque de vacío y por las vibraciones del hilo, la cuales han sido identificadas como una de las mayores fuentes de error a la hora de conocer la posición real del hilo. Por todo esto, el desarrollo de un nuevo dispositivo cuyas características cumplan los nuevos requerimientos era necesario. Este trabajo de tesis tiene como objetivo proporcionar criterios adecuados para el diseño y operación de un nuevo escáner, con el fin de minimizar las incertidumbres en la posición del hilo. Para lograr estos objetivos, el entender las vibraciones del hilo en un sistema de este tipo es un objetivo primordial. De manera más específica el desarrollo de sistemas de medida de vibración adecuados y la construcción de modelos dinámicos del sistema son los dos objetivos concretos perseguidos por este trabajo. De cara al nuevo diseño, este trabajo pretende proponer un diseño conceptual así como definir los criterios para la optimización de las partes más críticas y establecer un procedimiento de operación que permita al nuevo dispositivo alcanzar los requerimientos impuestos por las futuras condiciones del LHC.

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Beam diagnostics for high intensity hadron accelerators

Ausset

2007

Nuclear Instruments and Methods in Physics Research Section A:

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Techniques for intense-proton-beam profile measurements

Cited by 3 publications

References 19 publications

Initial operation of the LEDA beam-induced fluorescence diagnostic

Initial operation of the LEDA beam-induced fluorescence diagnostic

Minimisation of the wire position uncertainties of the new CERN vacuum wire scanner

Beam diagnostics for high intensity hadron accelerators

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