Dependence of charge-exchange efficiency on cooling water temperature of a beam transport line
Abstract The 3-GeV Rapid Cycling Synchrotron at the Japan Proton Accelerator Research Complex supplies a high-intensity proton beam for neutron experiments and to the Main Ring synchrotron. Various parameters are monitored to achieve a stable operation, and it was found that the oscillations of the...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-07-01
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| Series: | EPJ Techniques and Instrumentation |
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| Online Access: | https://doi.org/10.1140/epjti/s40485-021-00067-6 |
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| author | Kazami Yamamoto Shuichiro Hatakeyama Pranab Kumar Saha Katsuhiro Moriya Kota Okabe Masahiro Yoshimoto Takamitsu Nakanoya Kosuke Fujirai Yoshio Yamazaki Kazuaki Suganuma |
| author_facet | Kazami Yamamoto Shuichiro Hatakeyama Pranab Kumar Saha Katsuhiro Moriya Kota Okabe Masahiro Yoshimoto Takamitsu Nakanoya Kosuke Fujirai Yoshio Yamazaki Kazuaki Suganuma |
| author_sort | Kazami Yamamoto |
| collection | DOAJ |
| description | Abstract The 3-GeV Rapid Cycling Synchrotron at the Japan Proton Accelerator Research Complex supplies a high-intensity proton beam for neutron experiments and to the Main Ring synchrotron. Various parameters are monitored to achieve a stable operation, and it was found that the oscillations of the charge-exchange efficiency and cooling water temperature were synchronized. We evaluated the orbit fluctuations at the injection point using a beam current of the injection dump, which is proportional to the number of particles that miss the foil and fail in the charge exchange, and profile of the injection beam. The total width of the fluctuations was approximately 0.072 mm. This value is negligible from the user operation viewpoint as our existing beam position monitors cannot detect such a small signal deviation. This displacement corresponds to a 1.63 × 10− 5 variation in the dipole magnetic field. Conversely, the magnetic field variation in the L3BT dipole magnet, which was estimated by the temperature change directly, is 4.08 × 10− 5. This result suggested that the change in the cooling water temperature is one of the major causes of the efficiency fluctuation. |
| first_indexed | 2024-12-22T12:02:08Z |
| format | Article |
| id | doaj.art-1570c496354341a1ac086c0bc2c94479 |
| institution | Directory Open Access Journal |
| issn | 2195-7045 |
| language | English |
| last_indexed | 2024-12-22T12:02:08Z |
| publishDate | 2021-07-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | EPJ Techniques and Instrumentation |
| spelling | doaj.art-1570c496354341a1ac086c0bc2c944792022-12-21T18:26:33ZengSpringerOpenEPJ Techniques and Instrumentation2195-70452021-07-01811910.1140/epjti/s40485-021-00067-6Dependence of charge-exchange efficiency on cooling water temperature of a beam transport lineKazami Yamamoto0Shuichiro Hatakeyama1Pranab Kumar Saha2Katsuhiro Moriya3Kota Okabe4Masahiro Yoshimoto5Takamitsu Nakanoya6Kosuke Fujirai7Yoshio Yamazaki8Kazuaki Suganuma9Accelerator Division, Japan Proton Accelerator Research Complex (J-PARC) Center, Japan Atomic Energy Agency (JAEA)Accelerator Division, Japan Proton Accelerator Research Complex (J-PARC) Center, Japan Atomic Energy Agency (JAEA)Accelerator Division, Japan Proton Accelerator Research Complex (J-PARC) Center, Japan Atomic Energy Agency (JAEA)Accelerator Division, Japan Proton Accelerator Research Complex (J-PARC) Center, Japan Atomic Energy Agency (JAEA)Accelerator Division, Japan Proton Accelerator Research Complex (J-PARC) Center, Japan Atomic Energy Agency (JAEA)Accelerator Division, Japan Proton Accelerator Research Complex (J-PARC) Center, Japan Atomic Energy Agency (JAEA)Accelerator Division, Japan Proton Accelerator Research Complex (J-PARC) Center, Japan Atomic Energy Agency (JAEA)Accelerator Division, Japan Proton Accelerator Research Complex (J-PARC) Center, Japan Atomic Energy Agency (JAEA)Accelerator Division, Japan Proton Accelerator Research Complex (J-PARC) Center, Japan Atomic Energy Agency (JAEA)Accelerator Division, Japan Proton Accelerator Research Complex (J-PARC) Center, Japan Atomic Energy Agency (JAEA)Abstract The 3-GeV Rapid Cycling Synchrotron at the Japan Proton Accelerator Research Complex supplies a high-intensity proton beam for neutron experiments and to the Main Ring synchrotron. Various parameters are monitored to achieve a stable operation, and it was found that the oscillations of the charge-exchange efficiency and cooling water temperature were synchronized. We evaluated the orbit fluctuations at the injection point using a beam current of the injection dump, which is proportional to the number of particles that miss the foil and fail in the charge exchange, and profile of the injection beam. The total width of the fluctuations was approximately 0.072 mm. This value is negligible from the user operation viewpoint as our existing beam position monitors cannot detect such a small signal deviation. This displacement corresponds to a 1.63 × 10− 5 variation in the dipole magnetic field. Conversely, the magnetic field variation in the L3BT dipole magnet, which was estimated by the temperature change directly, is 4.08 × 10− 5. This result suggested that the change in the cooling water temperature is one of the major causes of the efficiency fluctuation.https://doi.org/10.1140/epjti/s40485-021-00067-6J-PARCProton synchrotronInjectionOrbitCharge exchangeStability |
| spellingShingle | Kazami Yamamoto Shuichiro Hatakeyama Pranab Kumar Saha Katsuhiro Moriya Kota Okabe Masahiro Yoshimoto Takamitsu Nakanoya Kosuke Fujirai Yoshio Yamazaki Kazuaki Suganuma Dependence of charge-exchange efficiency on cooling water temperature of a beam transport line EPJ Techniques and Instrumentation J-PARC Proton synchrotron Injection Orbit Charge exchange Stability |
| title | Dependence of charge-exchange efficiency on cooling water temperature of a beam transport line |
| title_full | Dependence of charge-exchange efficiency on cooling water temperature of a beam transport line |
| title_fullStr | Dependence of charge-exchange efficiency on cooling water temperature of a beam transport line |
| title_full_unstemmed | Dependence of charge-exchange efficiency on cooling water temperature of a beam transport line |
| title_short | Dependence of charge-exchange efficiency on cooling water temperature of a beam transport line |
| title_sort | dependence of charge exchange efficiency on cooling water temperature of a beam transport line |
| topic | J-PARC Proton synchrotron Injection Orbit Charge exchange Stability |
| url | https://doi.org/10.1140/epjti/s40485-021-00067-6 |
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