ILC RF system R&amp;D

Adolphsen, C.

doi:10.1109/pac.2007.4440117

Cited by 9 publications

(14 citation statements)

References 22 publications

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“…On the other hand, muon colliders have a potential to achieve collision energies of tens of TeV with a relatively small size for a collider ring, thus reaching way further than e + e − colliders and having a physics reach on-par with hadron colliders with hundreds of TeV in collision energy [25]. The current timeline to complete the accelerator R&D and be ready for the construction of a muon collider is estimated to be earliest in the latter part of the 2030s [26].…”

Section: Muon Collidermentioning

confidence: 99%

4-Dimensional Trackers

Berry¹,

Cairo²,

Dragone³

et al. 2022

Preprint

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Section: Muon Collidermentioning

confidence: 99%

4-Dimensional Trackers

Berry¹,

Cairo²,

Dragone³

et al. 2022

Preprint

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“…In Figure 2, the quadrupole offset x q , the BPM offset x b and the BPM measurement error x m are sketched together. The BPM reading is written as [1] …”

Section: Linac Alignment Problemmentioning

confidence: 99%

Linac Alignment Algorithm: Analysis on 1-to-1 Steering

Sun¹,

Adolphsen²

2011

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In a linear accelerator, it is important to achieve a good alignment between all of its components (such as quadrupoles, RF cavities, beam position monitors et al.), in order to better preserve the beam quality during acceleration. After the survey of the main linac components, there are several beam-based alignment (BBA) techniques to be applied, to further optimize the beam trajectory and calculate the corresponding steering magnets strength. Among these techniques the most simple and straightforward one is the one-to-one (1-to-1) steering technique, which steers the beam from quad center to center, and removes the betatron oscillation from quad focusing. For a future linear collider such as the International Linear Collider (ILC), the initial beam emittance is very small in the vertical plane (flat beam with γǫy = 20 − 40nm), which means the alignment requirement is very tight. In this note, we evaluate the emittance growth with one-to-one correction algorithm employed, both analytically and numerically. Then the ILC main linac accelerator is taken as an example to compare the vertical emittance growth after 1-to-1 steering, both from analytical formulae and multi-particle tracking simulation. It is demonstrated that the estimated emittance growth from the derived formulae agrees well with the results from numerical simulation, with and without acceleration, respectively. Linac alignment problemThe basic problem of linac misalignment can be sketched in Figure 1. The most ideal case is that all the elements of a linac are aligned on a straight line. In that case, there is no dispersive or wake-field-related emittance growth, if the beam is also injected on the axis. In practice, however, the linac components are scattered randomly with respect to the survey axis (treated as a straight line here) as shown in Figure 1. The beam will get a dipole kick when it pass by a quadrupole off center. If the offset is ∆y, the kick iswhere K 1 denotes the normalized quadrupole strength,Bρ , Bρ the beam rigidity which is proportional to beam energy, δ p the energy offset of the particle.In formula (1) it is shown that particle with different energy offset δ p (and same initial coordinates) will get different dipole kick from the same quadrupole misalignment, and then perform different motion and have different trajectory. That will introduce dispersion and the dispersive emittance growth which is δ p -correlated. In comparison, without the quadrupole misalignments (dipole kicks), the chromatic difference only from the quadrupole kick is relatively small, and all the particles will have "same" betatron linear oscillation under the quadrupole focusing.On the other hand, the beam centroid will follow the straight line without misalignment. With misalignment, it is also kicked and will perform "betatron" oscillation along the linac. Such an off-center distribution of the charges will generate wake field when it couples with the linac component impedance. The wake field has a longitudinal position correlation in the bunch, and wi...

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“…A cost effective RF power source system (High Level RF: HLRF) is a major focus of the ILC engineering and R&D. The current existing modulator/klystron technology is likely to be updated by using Marx generator technology [43]. A cost effective RF power distribution (wave guide) system is also a major topic [44].…”

Section: G High Level Rf System and Randdmentioning

confidence: 99%

Superconducting RF Cavity Development for the International Linear Collider

Yamamoto

2009

IEEE Trans. Appl. Supercond.

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The International Linear Collider is planned as the next energy-frontier electron-positron accelerator. The main linacs of the collider are based on superconducting radio-frequency cavity technology, and will accelerate electron and positron beams up to 250 + 250 GeV at the center-of-mass energy. Based on the Reference Design Report issued in 2007, the ILC Global Design Effort has moved into the Technical Design phase. This paper describes the status of the design, R&D efforts, and plans of the superconducting RF cavity for the ILC.

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ILC RF system R&D

Cited by 9 publications

References 22 publications

4-Dimensional Trackers

4-Dimensional Trackers

Linac Alignment Algorithm: Analysis on 1-to-1 Steering

Superconducting RF Cavity Development for the International Linear Collider

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