Tootfinder

Crystal Collimation Cleaning Measurements with 6.5 TeV protons in the LHC
Roberto Rossi, Gianluca Cavoto, Daniele Mirarchi, Stefano Redaelli, Walter Scandale
https://arxiv.org/abs/2507.13315

Crystal Collimation Cleaning Measurements with 6.5 TeV protons in the LHC
Safe disposal of beam halo is a fundamental requirement of modern superconductive hadron colliders to reduce thermal load on magnets and background to experimental detectors. In the CERN Large Hadron Collider (LHC) a multistage system fully compliant with the needs of the baseline operation was build. At a later stage, two short bent crystals were interleaved to the devices for betatron collimation to investigate efficiency enhancement of the halo disposal when inserting them as primary stages …

Dechanneling Population at Extreme Crystal Bending with 6.5 TeV Proton Beam
Roberto Rossi, Daniele Mirarchi, Stefano Redaelli, Walter Scandale
https://arxiv.org/abs/2507.13252

Dechanneling Population at Extreme Crystal Bending with 6.5 TeV Proton Beam
Beam measurements with bent crystals, installed in the Large Hadron Collider to assist multistage collimation system, provided information on hadron interactions with crystals in the multi-TeV energy range. In particular, the dechanneling population was observed through scans of deflected halo with collimators. Taking advantage of the fact that crystals with different values of curvature radii were present, the dependence of dechanneling on bending radius (R) was recorded. Dechanneling was foun…

Jet Collimation Profile of Low-Luminosity AGN M84: Insight into the Jet Formation in the Low Accretion Regime
Elika Prameswari Fariyanto, Kazuhiro Hada, Yuzhu Cui, Mareki Honma, Masanori Nakamura, Keiichi Asada, Xuezheng Wang, Wu Jiang
https://arxiv.org/abs/2507.21241

Jet Collimation Profile of Low-Luminosity AGN M84: Insight into the Jet Formation in the Low Accretion Regime
Recent advancements in high-resolution Very Long Baseline Interferometry (VLBI) have significantly improved our understanding of jet collimation near supermassive black holes in active galactic nuclei (AGNs), particularly in high-power systems. However, the collimation properties of jets in low-luminosity AGNs (LLAGNs) remain poorly explored. In this study, we investigate the jet structure of M84, a nearby radio galaxy and a representative LLAGN, to probe jet collimation properties in a low-acc…

Jet collimation in a spiral-hosted AGN: a parabolic jet profile in 0313-192
Seung Yeon Lee, Jae-Young Kim
https://arxiv.org/abs/2508.03817 https://arxiv.or…

Jet collimation in a spiral-hosted AGN: a parabolic jet profile in 0313-192
Double-lobed radio sources associated with active galactic nuclei (DRAGNs) are typically found in elliptical galaxies, while supermassive black holes (SMBHs) in disk galaxies rarely produce powerful kpc-scale jets. However, the growing number of spiral- and disk-hosted DRAGNs challenges this classical dichotomy. We present a study of the jet collimation profile for one such source, 0313-192, using VLBA and VLA data, tracing the jet morphology across nearly five orders of magnitude in scale -- f…

Analysis of Jet Dynamics and Collimation Characteristics of 0241 622 on Parsec Scales
Haitian Shang, Wei Zhao, Xiaoyu Hong, Xu-zhi Hu
https://arxiv.org/abs/2506.04661

Analysis of Jet Dynamics and Collimation Characteristics of 0241+622 on Parsec Scales
We conducted a detailed analysis of the jet structure and dynamics of the source 0241+622 on milliarcsecond (mas) scales. We stacked images from multiple epochs to better recover the crosssection of the jet. By analyzing the relationship between jet width and distance, we observed that the jet exhibits a parabolic shape from the core, spanning a region from 0.12 to 6.1 mas. This structure suggests the acceleration and collimation processes of the jet. Beyond 18 mas from the core, the jet adopts…

Collimation of Fast Radio Burster 20201124A; Repeaters vs. Apparent Non-Repeaters
J. I. Katz
https://arxiv.org/abs/2505.24082 https://

Collimation of Fast Radio Burster 20201124A; Repeaters vs. Apparent Non-Repeaters
The recent report of a period in the active repeating Fast Radio Burster 20201124A and measurement of its spindown rate place bounds on the solid angle of its emission on the basis of energetics. The bound depends on the (unknown) efficiency of conversion of rotational energy to coherent radio emission and implies a lower bound on the Lorentz factor of the radiating charges. Bursts may be emitted along the magnetic dipole axis, in repeaters aligned with the rotational axis and the line of sight…

This https://arxiv.org/abs/2505.24082 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Collimation of Fast Radio Burster 20201124A; Repeaters vs. Apparent Non-Repeaters
The recent report of a period in the active repeating Fast Radio Burster 20201124A and measurement of its spindown rate place bounds on the solid angle of its emission on the basis of energetics. The bound depends on the (unknown) efficiency of conversion of rotational energy to coherent radio emission and implies a lower bound on the Lorentz factor of the radiating charges. Bursts may be emitted along the magnetic dipole axis, in repeaters aligned with the rotational axis and the line of sight…

This https://arxiv.org/abs/2505.24082 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Collimation of Fast Radio Burster 20201124A; Repeaters vs. Apparent Non-Repeaters
The recent report of a period in the active repeating Fast Radio Burster 20201124A and measurement of its spindown rate place bounds on the solid angle of its emission on the basis of energetics. The bound depends on the (unknown) efficiency of conversion of rotational energy to coherent radio emission and implies a lower bound on the Lorentz factor of the radiating charges. Bursts may be emitted along the magnetic dipole axis, in repeaters aligned with the rotational axis and the line of sight…

Investigating the Jet Width Profile of CTA 102 with Very Long Baseline Interferometry at Parsec Scales
ZhanHao Ng, Juan Carlos Algaba, Zamri Zainal Abidin
https://arxiv.org/abs/2508.03044

Investigating the Jet Width Profile of CTA 102 with Very Long Baseline Interferometry at Parsec Scales
Active Galactic Nucleus jets have long be thought to exhibit a conical jet shape, but recently, several jets were found to have a transition from parabolic to conical structure. As more sources are investigated, this collimation profile appears to represent a common paradigm. Previous works suggest that the Bondi radius may serve as an indicator of the transition location, although discrepancies have been observed in some sources. To explore this further, we selected CTA 102 for which existing …