Design of a Low-Q S-Band Cavity Beam Position Monitor

Shin, Seung-Ho; Kim, Eun−San; Kim, Hyoung Suk; Son, D. C.

doi:10.3938/jkps.52.992

Cited by 5 publications

(5 citation statements)

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“…[33][34][35][36] When waveguide cavities possess no symmetry, 3D programs are used to obtain the RF field solution, but due to computational constraints on memory and solution time for long complex linac structures, small sections of the waveguide are typically modeled separately. 33,[37][38][39][40][41] The last step in this full linac simulation is to implement particle simulations which utilize the electron injection phase space, together with the RF field solution within the waveguide, to track the electrons or ions as they accelerate through the linac. A common particle simulation program is the widely used phase and radial motion in electron linear accelerators ͑PARMELA͒ program.…”

Section: Introductionmentioning

confidence: 99%

An integrated 6 MV linear accelerator model from electron gun to dose in a water tank

Aubin

Steciw

Kirkby³

et al. 2010

Medical Physics

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Section: Introductionmentioning

confidence: 99%

An integrated 6 MV linear accelerator model from electron gun to dose in a water tank

Aubin

Steciw

Kirkby³

et al. 2010

Medical Physics

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“…Our cavity BPM is based on a previous design by S. Shin [5], but some important modifications have been applied by HFSS simulation code [6], see figure 2. To detect the position of the beam, we selected a cylindrical structure of the resonator.…”

Section: Design Of Cavity Bpmmentioning

confidence: 99%

“…In addition, the external quality factor, Q, corresponding to the external power loss, is controlled by the slot length, as shown in figure 3, which is based on HFSS result. To satisfy a decay time of 100 nsec, a slot length of 25 mm was chosen, which is substantially shorter than the 31 mm slot in the cavity BPM designed by S. Shin [5]. When the slot length was decreased from 31 mm to 25 mm, the external Q was increased inversely and therefore the decay time approximately becomes by a factor of three.…”

Section: Design Of Cavity Bpmmentioning

confidence: 99%

Development of an S-band cavity Beam Position Monitor for ATF2

Heo¹,

Kim²,

Kim³

et al. 2013

J. Inst.

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We have developed an S-band cavity Beam Position Monitor (BPM) in order to measure the position of an electron beam in the final focus area at ATF2, which is the test facility for the final focus design for the International Linear Collider (ILC). The lattice of the ILC Beam Delivery System (BDS) has been modified, requiring a larger physical aperture of 40 mm in the final focus area. The beam orbit measurement in this area is now covered with high resolution S-Band cavity BPMs. In this paper we summarize the design of the cavity BPM and the first experimental results. The calibration slopes were measured as 0.87 counts/µm in the x-coordinate direction and 1.16 counts/µm in the y-coordinate direction.

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“…The FP model is numerically stable in most cases, but we find that it encounters numerical problems rather often when the effects of tidal shocks are included in the anisotropic FP model. To avoid such a problem, Shin & Kim (2007) developed a new integration scheme for a two‐dimensional FP equation by adopting an Alternating Direction Implicit method. We use this scheme for our calculations.…”

Section: Models and Initial Conditionsmentioning

confidence: 99%

Dynamical evolution of the mass function and radial profile of the Galactic globular cluster system

Shin

Kim

Takahashi

2008

Monthly Notices of the Royal Astronomical Society: Letters

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Evolution of the mass function (MF) and radial distribution (RD) of the Galactic globular cluster (GC) system is calculated using an advanced and a realistic Fokker–Planck (FP) model that considers dynamical friction, disc/bulge shocks and eccentric cluster orbits. We perform hundreds of FP calculations with different initial cluster conditions, and then search a wide‐parameter space for the best‐fitting initial GC MF and RD that evolves into the observed present‐day Galactic GC MF and RD. By allowing both MF and RD of the initial GC system to vary, which is attempted for the first time in the present Letter, we find that our best‐fitting models have a higher peak mass for a lognormal initial MF and a higher cut‐off mass for a power‐law initial MF than previous estimates, but our initial total masses in GCs, MT,i= 1.5–1.8 × 108 M⊙, are comparable to previous results. Significant findings include that our best‐fitting lognormal MF shifts downward by 0.35 dex during the period of 13 Gyr, and that our power‐law initial MF models well‐fit the observed MF and RD only when the initial MF is truncated at ≳105 M⊙. We also find that our results are insensitive to the initial distribution of orbit eccentricity and inclination, but are rather sensitive to the initial concentration of the clusters and to how the initial tidal radius is defined. If the clusters are assumed to be formed at the apocentre while filling the tidal radius there, MT,i can be as high as 6.9 × 108 M⊙, which amounts to ∼75 per cent of the current mass in the stellar halo.

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Design of a Low-Q S-Band Cavity Beam Position Monitor

Cited by 5 publications

References 0 publications

An integrated 6 MV linear accelerator model from electron gun to dose in a water tank

An integrated 6 MV linear accelerator model from electron gun to dose in a water tank

Development of an S-band cavity Beam Position Monitor for ATF2

Dynamical evolution of the mass function and radial profile of the Galactic globular cluster system

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