A cryogenic buffer gas beam source with in-situ ablation target replacement
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arXiv
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| Autori principali: | , , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866914332211675136 |
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| author | Han, Zhen Lasner, Zack Diver, Collin Hu, Peiran Masuda, Takahiko Wu, Xing Hiramoto, Ayami Watts, Maya Uetake, Satoshi Yoshimura, Koji Fan, Xing Gabrielse, Gerald Doyle, John M. DeMille, David |
| author_facet | Han, Zhen Lasner, Zack Diver, Collin Hu, Peiran Masuda, Takahiko Wu, Xing Hiramoto, Ayami Watts, Maya Uetake, Satoshi Yoshimura, Koji Fan, Xing Gabrielse, Gerald Doyle, John M. DeMille, David |
| contents | The design and performance of a cryogenic buffer gas beam (CBGB) source with a load-lock system is presented. The ACME III electron electric dipole moment (eEDM) search experiment uses this source to produce a beam of cold, slow thorium monoxide (ThO) molecules. A key feature of the apparatus is its capability to replace ablation targets without interrupting vacuum or cryogenic conditions, increasing the average signal in the eEDM search. The source produces approximately $1.3 \times 10^{11}$ ground-state ThO molecules per pulse, with a rotational temperature of $4.8$ K, molecular beam solid angle of $0.31$ sr, and forward velocity of $200$ m/s. These parameters match the performance of traditional sources that require time-consuming thermal cycles for target replacement. A long-term yield improvement of about 40% is achieved when the load-lock system is used to replace targets biweekly. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_11647 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A cryogenic buffer gas beam source with in-situ ablation target replacement Han, Zhen Lasner, Zack Diver, Collin Hu, Peiran Masuda, Takahiko Wu, Xing Hiramoto, Ayami Watts, Maya Uetake, Satoshi Yoshimura, Koji Fan, Xing Gabrielse, Gerald Doyle, John M. DeMille, David Atomic Physics The design and performance of a cryogenic buffer gas beam (CBGB) source with a load-lock system is presented. The ACME III electron electric dipole moment (eEDM) search experiment uses this source to produce a beam of cold, slow thorium monoxide (ThO) molecules. A key feature of the apparatus is its capability to replace ablation targets without interrupting vacuum or cryogenic conditions, increasing the average signal in the eEDM search. The source produces approximately $1.3 \times 10^{11}$ ground-state ThO molecules per pulse, with a rotational temperature of $4.8$ K, molecular beam solid angle of $0.31$ sr, and forward velocity of $200$ m/s. These parameters match the performance of traditional sources that require time-consuming thermal cycles for target replacement. A long-term yield improvement of about 40% is achieved when the load-lock system is used to replace targets biweekly. |
| title | A cryogenic buffer gas beam source with in-situ ablation target replacement |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2505.11647 |