Published 2023
| Version v1
Miscellaneous
Recent report on tunnel level measurement in SuperKEKB
- 1. High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki (Japan)
Description
In SuperKEKB, 355 level reference points were placed at equal intervals on the walls of a 3-km tunnel. By surveying these reference points using the DNA03 digital surveying instrument, we are measuring the height of the SuperKEKB tunnel. This data is important to see the impact of tunnel level changes on the accelerator. We reported on the changes in tunnel levels during SuperKEKB construction in 2015 as well. We have continued to survey the tunnel levels since then. As before, we still see a lowering of the Fuji side reference point compared to Tsukuba. This paper reports on the changes in the tunnel level in recent years. (author)
Availability note (English)
Available from https://www.pasj.jp/web_publish/pasj2023/proceedings/PDF/THP4/THP41.pdfAbstract (Japanese)
SuperKEKB電磁石グループでは、全周3kmのトンネルの壁面に等間隔に設置されたレベル基準点を用いて、トンネル全周の高さレベル測量を実施している。この測量で得られるデータは、トンネルレベル変動の加速器への影響を見るために重要な資料となる。2015年の加速器学会年会では、SuperKEKB建設に伴う機械棟増設、PF-AR直接入射路増設に伴うトンネルレベルへの影響の調査、およびトンネル全周レベルの長期的な変動について報告した。以降も毎年、トンネル全周のレベル測量を継続している。以前報告した事象と同じく、現在も筑波実験室から見た大穂、富士実験室の相対的下降傾向が見られる。また近年、施設内での各種建屋等の増設が実施されているため、それらによる影響の有無を調査することも重要である。本発表は近年のトンネル高さレベルの変化について報告する。(著者)Additional details
Additional titles
- Original title (Japanese)
- SuperKEKB トンネルのレベル変化に関する続報告
Publishing Information
- Imprint Pagination
- [1105 p.]
- Journal Page Range
- p. 775-777
Conference
- Title
- 20. annual meeting of Particle Accelerator Society of Japan
- Acronym
- PASJ2023
- Dates
- 29 Aug - 1 Sep 2023
- Place
- Funabashi, Chiba (Japan)
INIS
- Country of Publication
- Japan
- Country of Input or Organization
- Japan
- INIS RN
- 56002048
- Subject category
- S43: PARTICLE ACCELERATORS;
- Resource subtype / Literary indicator
- Conference, Non-conventional Literature
- Descriptors DEI
- ANNUAL VARIATIONS; BEAM INJECTION; DIGITALIS; ELECTROMAGNETS; ELECTRON-POSITRON COLLISIONS; GROUND LEVEL; KEK PHOTON FACTORY; KEK SYNCHROTRON; MAINTENANCE; NATURAL ANALOGUE; SITE CHARACTERIZATION; TUNNELS
- Descriptors DEC
- ACCELERATORS; COLLISIONS; CYCLIC ACCELERATORS; ELECTRICAL EQUIPMENT; ELECTRON COLLISIONS; EQUIPMENT; LEVELS; MAGNETS; MAGNOLIOPHYTA; MAGNOLIOPSIDA; MEDICINAL PLANTS; PLANTS; POSITRON COLLISIONS; RADIATION SOURCES; SYNCHROTRON RADIATION SOURCES; SYNCHROTRONS; UNDERGROUND FACILITIES; VARIATIONS
Optional Information
- Notes
- 4 refs., 6 figs. Imprint:#7B2C#20#56DE# #65E5##672C##52A0##901F##5668##5B66##4F1A##5E74##4F1A#