Transparent Injection into Electron and Positron Accelerator Rings
Notice bibliographique
Résumé
Particle accelerator rings utilize high energy particles for a broad range of scientific purposes. Synchrotron\nlight source facilities such as the Canadian Light Source (CLS) utilize radiation emitted by the acceleration\nof electrons in an electromagnetic trap called a storage ring to investigate many topics including agricultural,\nbiomedical, and materials science problems. Particle colliders like the planned Future Circular Collider\nelectron-positron machine (FCC-ee) also store a beam of accelerated particles in a collider ring. The difference\nis that the FCC-ee will also have a second beam traveling in the opposite direction. The two beams collide\nat interaction points (IPs) which are observed using very precise detectors. Colliders study the fundamental\nparticles’ structure and test the standard model, one goal of FCC-ee is to intensely study the Higg’s boson[1].\nIn both machines the particle beams travel in very high vacuum to minimize scattering off gas particles.\nHowever, the beams travel near the speed of light and traverse the nearly 100 km FCC-ee ring many thousands\nof times, and the much smaller 171 m CLS ring millions of times, per second. Thus, particle losses are\nnon-negligible and beam current decays over time. In a light source the intensity of radiation provided to\nexperiments is important for the quality of their measurements. In a collider the key value is luminosity, a\nmeasure of the rate of interactions between particles. Both these values depend on the beam current stored in\nthe rings and each machine benefits greatly from maintaining consistently high beam current. Thus, particles\nare regularly injected into the rings to prevent the beam current from decaying, called top-up injection.\nIn order to store new particles in an accelerator ring, pulsed magnets are used to steer the additional\nparticles into the machine. These magnets disturb the beam stored in the ring resulting in oscillation of the\nbeam after each injection. The intensity of light CLS provides modulates as the electron beam moves relative\nto experimental optics, affecting researcher’s data. Similarly, misalignment of the beams in a collider will\nreduce the luminosity. Ideally, injection would be transparent to the experiments, not disturbing the stored\nbeam. In practice transparent injection does not completely remove the disturbance but minimizes it.\nThis thesis presents my work on transparent top-up injection for CLS and FCC-ee. For the CLS I had the\nobjective of finding alternative injection schemes which could be implemented into the current CLS machine,\nand minimizing the post-injection transient oscillation of the stored beam. Simulation of several approaches\nachieved a reduction of the magnitude of post-injection stored beam oscillation by a factor of 50. However,\nthe large size of the injected beam at the CLS meant that the injection efficiency was insufficient for the\nalternative injection approach to be used in normal operations.\nFor FCC-ee my objectives were to develop magnet settings to allow for each of four proposed injection\napproaches. Further, I studied injection with the novel multipole kicker magnet design proposed for FCC-ee.\nSimulation of effects of the multipole kicker on the stored beam, and its sensitivity to misalignments and\nother errors showed that there is risk for instabilities of the beam potentially resulting in significant losses.\nThese studies led to a recommendation for the baseline injection scheme as the FCC-ee project continues.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,001 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».