Conveners
Session 4
- Marcelo Juni Ferreira (European Spallation Source ERIC)
- Linda Valerio (Fermilab)
Session 4
- Junichiro Kamiya (Japan Atomic Energy Agency / J-PARC center)
- Genfa Wu (FNAL/TD)
Session 4
- Junichiro Kamiya (Japan Atomic Energy Agency / J-PARC center)
- Genfa Wu (FNAL/TD)
Session 4
- Mayling Wong-Squires (Fermilab)
- Marcelo Juni Ferreira (European Spallation Source ERIC)
The vacuum requirements of the RAON heavy ion accelerator were determined from the beam optics calculations. The vacuum system was designed to meet vacuum requirements using 3D Molflow+ code with realistic outgassing values of the vacuum chambers, cavities and beam pipes. This paper presents the specification and configuration of the vacuum system including pumps, gate valves, and vacuum...
The APS-Upgrade’s (APS-U) new storage ring vacuum system is an assembly of over 2400 custom vacuum chambers and photon absorbers. A number of vacuum component vendors were contracted to fabricate the majority of these components including NEG-coated vacuum chambers, photon absorbers, beam position monitor vacuum chambers. In addition, APS-U leveraged in-house aluminum welding expertise to...
The APS-Upgrade (APS-U) project’s new storage ring vacuum system has been assembled and installed between 2022 and early 2024. Much of the vacuum system was pre-assembled during a ‘magnet & vacuum module assembly phase between 2022 and mid-2023 where 200 magnet modules (5 modules per each of 40 sectors) were assembled comprising about 90% of the storage ring vacuum system components. The...
The APS-Upgrade (APS-U) project’s new storage ring vacuum system has been assembled and installed between 2022 and early 2024. Much of the vacuum system was pre-assembled during a magnet & vacuum module assembly phase between 2022 and mid-2023 where 200 magnet modules (5 modules per each of 40 sectors) were assembled comprising about 90% of the storage ring vacuum system components. This...
While the NSLSII synchrotron is a third-generation light source providing outstanding brightness and flux, there is a robust R&D program in place to upgrade to a fourth generation, or beyond, facility. Inherent in the so-called complex-bend magnet and lattice designs are significant limitations on the beam and exit slot apertures of the vacuum chamber. These restrictions and the need for the...
Over recent years, a variety of isotherm models have been employed at CERN to simulate a broad spectrum of scenarios. These models, originally developed from zero dimensional models prepared by Redhead [1] and Kanazawa [2] have evolved into more sophisticated 1D and 3D simulations. They have been used for diverse applications, ranging from optimizing bakeout for gravitational wave detectors to...
Successful operations of the Cornell High Energy Synchrotron Source Upgrade (CHESS-U) have proven the in-service reliability of the compact non-evaporable getter (NEG) pumps in a new experimental vacuum system predominantly pumped with distributed NEG-strips and modular high-capacity NEG pumps. The 80-meter section improvement in the Cornell Electron Storage Ring (CESR) is composed of 6...
The 4th generation storage ring project in Korea (Korea-4GSR) has begun in 2021 and is scheduled to be completed in 2017. The 800-meter long storage ring is designed to store 62-pm rad emittance electron beam with numbers of strong magnets, resulting in spatial restriction for the vacuum system. To overcome the low gas conductance of the vacuum chamber, the main idea we have employed is to use...
The performance of the main vacuum chamber of the Korea 4th generation storage ring (Korea-4GSR) was evaluated. The hydrogen outgassing rate of the aluminum extrusion chamber was measured using the gas accumulation method. After heat treatment for 150°C-48 hours, the outgassing rate is approximately 1E-13 mbar l/s cm². The pumping speed of the pill-type getters was measured under various...
The Korea Fourth-Generation Storage Ring (Korea-4GSR) has an ultra-low beam emittance of 62 pm·rad which demands spatially restricted vacuum system. The conventional vacuum system using lumped pumps is not suitable to guarantee the required vacuum level in this conductance limited system. To overcome the limited space for vacuum components, we employed a distributed pumping system with...
Vacuum firing, which is a heat treatment at high temperature in a high vacuum furnace, is known as the method for the outgassing reduction of the vacuum materials, such as stainless steel, titanium, etc. The outgassing rate of the vacuum-fired stainless steel is known to be low after ordinal baking at 150-200℃. In this research, the effect of the vacuum firing (850℃ for 10 h) on the stainless...