rf design of a pulse compressor with correction cavity chain for klystron-based compact linear collider

Abstract

We present an X-band high-power pulse compression system for a klystron-based compact linear collider. In this system design, one rf power unit comprises two klystrons, a correction cavity chain, and two SLAC Energy Doubler (SLED)-type X-band pulse compressors (SLEDX). An rf pulse passes the correction cavity chain, by which the pulse shape is modified. The rf pulse is then equally split into two ways, each deploying a SLEDX to compress the rf power. Each SLEDX produces a short pulse with a length of 244 ns and a peak power of 217 MW to power four accelerating structures. With the help of phaseto-amplitude modulation, the pulse has a dedicated shape to compensate for the beam loading effect in accelerating structures. The layout of this system and the rf design and parameters of the new pulse compressor are described in this work.

Multimodal Imaging in Oncology: Challenges and Future Directions

“…PET/MRI is a relatively new hybrid imaging modality that combines the functional information from PET with the high soft-tissue contrast provided by MRI [19]. This modality has shown promise in the assessment of various cancers, such as prostate, brain, and gynecological malignancies, and offers potential advantages over PET/CT in terms of reduced radiation exposure and improved soft-tissue visualization [20].…”

“…One of the main challenges in multimodal imaging is the accurate registration and fusion of images from different modalities [19]. Various factors can affect the quality of image registration, such as differences in patient positioning, scanner calibration, and image resolution [3].…”

“…2.The average position imaging method estimates the expiratory cycle and obtains several PET/CT fusion images of different respiratory phases in one respiratory cycle [19] and obtains several PET/CT fusion images of different respiratory phases in one respiratory cycle, so as to obtain a time-weighted average position of the internal structures of all organs including tumors. Compared with 4D imaging, the method is simple, low cost, and has a higher signal-to-noise ratio, and removes the systematic error of direct 3D imaging and the actual position deviation, narrows the safety margin of target area delineation, improves treatment efficiency, and protects surrounding normal tissues.…”

The International Linear Collider (Report to Snowmass 2021)

“…Recent advances in pulse compressors [706] with super-compact spherical cavities has dramatically changed the performance potential for these systems. It has been shown that a chain of spherical cavities can produce tailored pulse formats with extremely high conversion efficiency if the power gain is kept low [711]. A pre-pulse power compression ratio of three can be achieved with >80% conversion efficiency.…”

Demonstration of a cavity-based pulse compression system for pulse shape correction

“…Therefore, a cavity-based system can partly function like a delay line as an alternative. The idea is to put several resonant peaks around the operating frequency to simulate the delay line, which can be realized by coupled cavities or a cavity chain [25][26][27]. Such a system is expected to correct the pulse shape generated by a SLED or BOC type pulse compressor without need of low efficiency pulse modulation [20,28] or a solution based on long delay lines.…”