Comparison of photodesorption yields from aluminum, stainless and Cu-plated beam tubes

Halama, H. J.; Foerster, C. L.

doi:10.1016/0042-207x(91)91815-6

Cited by 15 publications

(3 citation statements)

References 3 publications

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“…Lithium, like other alkali-metal atoms, can be desorbed from surfaces using UV light [48]. However, UV light also desorbs other, unwanted species from surfaces, such as water and oxygen [49, 50, 51], increasing their background gas pressures. In a recent experiment [48], we observed that the increase in pressure due to unwanted gasses is significantly smaller than our low-outgasssing lithium dispensor.…”

Section: Details Of the Planned Devicementioning

confidence: 99%

Challenges to miniaturizing cold atom technology for deployable vacuum metrology

et al. 2018

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Cold atoms are excellent metrological tools; they currently realize SI time and, soon, SI pressure in the ultra-high (UHV) and extreme high vacuum (XHV) regimes. The development of primary, vacuum metrology based on cold atoms currently falls under the purview of national metrology institutes. Under the emerging paradigm of the “quantum-SI”, these technologies become deployable (relatively easy-to-use sensors that integrate with other vacuum chambers), providing a primary realization of the pascal in the UHV and XHV for the end-user. Here, we discuss the challenges that this goal presents. We investigate, for two different modes of operation, the expected corrections to the ideal cold-atom vacuum gauge and estimate the associated uncertainties. Finally, we discuss the appropriate choice of sensor atom, the light Li atom rather than the heavier Rb.

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Section: Details Of the Planned Devicementioning

confidence: 99%

Challenges to miniaturizing cold atom technology for deployable vacuum metrology

et al. 2018

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“…Light-induced desorption of vacuum contaminants from the viewports causes the observed pressure variation [45][46][47]. The pressure rise (fall) is well-described by a double exponential growth (decay), which has previously been observed to be characteristic of LIAD [13,18].…”

Section: Resultsmentioning

confidence: 64%

Light-induced atomic desorption of lithium

et al. 2018

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We demonstrate loading of a Li magneto-optical trap using light-induced atomic desorption. The magnetooptical trap confines up to approximately 4 × 104 7Li atoms with loading rates up to approximately 4 × 103 atoms per second. We study the Li desorption rate as a function of the desorption wavelength and power. The extracted wavelength threshold for desorption of Li from fused silica is approximately 470 nm. In addition to desorption of lithium, we observe light-induced desorption of background gas molecules. The vacuum pressure increase due to the desorbed background molecules is ≲ 50 % and the vacuum pressure decreases back to its base value with characteristic timescales on the order of seconds when we extinguish the desorption light. By examining both the loading and decay curves of the magneto-optical trap, we are able to disentangle the trap decay rates due to background gases and desorbed lithium. Our results show that light-induced atomic desorption can be a viable Li vapor source for compact devices and sensors.

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“…The q at the initial stage is in the order of lo-' molecules/photon. The q decreases with pho- [5] in NSLS, and almost the same order as those of aluminum-alloy ducts [3,4,5]. All of copper duct refered, however, had received chemical etching be- fore the experiments.…”

Section: B Photon Slimulaled Gas Desorption (Psd)mentioning

confidence: 53%

Test fabrication of a copper beam duct for the KEK B-factory

Suetsugu

Kanazawa

Proceedings of International Conference on Particle Accelerators

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A bsimctA trial model of copper beam duct for the KEK B-Factory was fabricated and gas desorption rates were measured. The duct consists of a cooling channel, a beam channel and a pump channel, which were extruded separately and welded each other by the electron beam welding. The duct received only ultrasonic cleaning in a freon bath. The ultimate total pressure was about 4x1O-l0 Torr after a baking at 15OOC for 48 hours and the thermal gas desorption rate was calculated as about 1.5~10-'~Torr. l/(s. cm') in Nz equivalent. The measurement of the photon stimulated gas desorption rate was performed using the synchrotron radiation with a critical energy of 26.3 keV from the TRISTAN Accumulation Ring. The photo-desorption coefficients in the order of molecules/photon were observed for main gases desorbed at the initial stage. These high gas desorption rates indicate that more careful surface preparation must be necessary.

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Comparison of photodesorption yields from aluminum, stainless and Cu-plated beam tubes

Cited by 15 publications

References 3 publications

Challenges to miniaturizing cold atom technology for deployable vacuum metrology

Challenges to miniaturizing cold atom technology for deployable vacuum metrology

Light-induced atomic desorption of lithium

Test fabrication of a copper beam duct for the KEK B-factory

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