Beam Diagnostic Instrumentation at CESR

Rice, D.; Aharonian, G.; Adams, K.J.; Billing, M.; Decker, G.; Dunnam, Curt R.; Giannella, M.; Jackson, G.; Littauer, R.; McDaniel, B. D.; Morse, David L.; Peck, S.; Sakazaki, L.; Seeman, J.; Siemann, R.H.; Talman, R.

doi:10.1109/tns.1983.4332757

Cited by 13 publications

(3 citation statements)

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“…This can be achieved by experimentally steering the orbit with a corrector magnet, while observing the orbit shift by the quadrupole variation at each * xiahuang@slac.stanford.edu step. This could be done manually [5]. A commonly used method is implemented in the Matlab Middle Layer [6], for which the quadrupole center offset is found by interpolating the orbit shifts due to the quadrupole gradient variation with respect to the beam orbit to find the zerocrossing [7].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous beam based alignment measurement for multiple magnets

Huang¹

2022

Preprint

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We propose a method to simultaneously determine the magnetic centers of multiple quadrupoles in a transport line or a storage ring. The method finds the magnet centers by correcting the orbit shift due to a change of the quadrupole gradient strengths with orbit correctors. The quadrupoles are selected with orbit corrector magnets and beam position monitors in between to ensure that orbit correction at the quadrupole locations can be achieved. The correction of the induced orbit shift is done by steering the orbit toward the quadrupole centers with correctors, using its response matrix with respect to the correctors. The response matrix can be measured or calculated. Simulations with a section of the Linac Coherent Light Source (LCLS) II and the SPEAR3 storage ring are done to demonstrate the feasibility and performance of the method. It is also experimentally tested on SPEAR3. The method can be extended for beam based alignment measurement of nonlinear magnets.

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Section: Introductionmentioning

confidence: 99%

Simultaneous beam based alignment measurement for multiple magnets

Huang¹

2022

Preprint

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“…2. The offset of the BPM relative to the reference orbit in a plane is y BPM = y quad + y k -mod : (1) Ten different random distributions were used for each RMS value of the offsets. The orbit was corrected to the best The linear calculations of SITF do not give a realistic absolute value of the polarisation level.…”

Section: Impact On Polarisation Levelmentioning

confidence: 99%

“…Beam position monitors (BPM) at the quadrupoles can have a mechanical or electronical offset with respect to the magnetic centre of the magnets. This offset is measured by a beam based method [1].…”

Section: Introductionmentioning

confidence: 99%

Beam position monitor offset determination at LEP

Tecker

Dehning²,

Galbraith³

et al.

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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For the performance of an electron positron storage ring it is important that the beam orbit passes well centred through the quadrupole magnets. Beam position monitors (BPM) aligned relative to the magnets can still have a residual mechanical or electronical offset with respect to the magnetic axis. A beam-based method is used at LEP to measure these offsets. During the machine operation for physics the gradient of selected quadrupoles is modulated with low frequencies (few Hz) and very small amplitudes (of the order of 10 4 ). The effect on the beam is observed with a high sensitivity pick-up. The observed effect passes through a minimum when the beam is centred in the quadrupole. Offsets for about 70 different BPM's were determined. Systematically different offsets were found for different type of BPM electronics and different types of quadrupoles. Simulations based on the past results show that the level of spin polarisation can be increased by further offset measurements.

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Magnetic Field Mapping

Henrichsen

2002

Encyclopedia of Imaging Science and Technology

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Magnetic field mapping is the production of maps or images of magnetic fields in space. Magnetic field maps are needed for designing and optimizing of magnets used in particle accelerators, spectrometers (mass, nuclear magnetic resonance, and electron paramagnetic resonance), and magnetic resonance imaging systems. Magnetic field maps are also used in geologic exploration where the variations in the magnitude and direction of the earth's magnetic field are indicative of subsurface features and objects. Field mapping relies on various methods of measuring the magnetic field, generally one point at a time. These measurement methods are the main focus of this article. It is curious to note that most measurement methods have remained virtually unchanged for a very long period, but the equipment has been subject to continual development. In this article, only the more commonly used methods are discussed. These methods are complementary and a wide variety of the equipment is readily available from industry. For the many other existing measurement methods, a more complete discussion can be found in two classical bibliographical reviews. Much of the material was presented at the CERN Accelerator School on Measurement and Alignment of Accelerator and Detector Magnets.

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Beam Diagnostic Instrumentation at CESR

Cited by 13 publications

References 0 publications

Simultaneous beam based alignment measurement for multiple magnets

Simultaneous beam based alignment measurement for multiple magnets

Beam position monitor offset determination at LEP

Magnetic Field Mapping

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