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Laboratory Cleanliness Update: Achieving High Standards for your Tent Crew

This update details the progress made in cleaning the HBD and glovebox areas, including the effective use of air baths and HEPA units. Challenges encountered with dust levels and damaged equipment are also highlighted, with plans for future cleaning and testing outlined. The expected schedule for completing the cleaning process and preparing for upcoming shots is provided, along with a question regarding the installation of shades components in the glovebox.

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Laboratory Cleanliness Update: Achieving High Standards for your Tent Crew

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  1. Stony Brook Update:Keep It Clean T.K. Hemmick for the Tent Crew

  2. Cleaning Complete Almost Complete • Excellent progress made on cleaning both the HBD itself and the glovebox. • Clean Air Bath(s) • Laminar table provided clean air bath for the HBD itself resting there for about one week. • Dust levels unmeasurable holding dust monitor at the surface under air flow. • Glovebox proved to be more of a challenge. • Dust does not want to leave closed quarters. • Large (2’ x 4’) high flow HEPA unit on removed wall at airlock end…open wall at HBD end. • Excellent readings after a few days (class 20). • HOWEVER(!) HEPA filter on inlet side of the glovebox is somehow shot (source of dust, even though air entering filter is clean) • New filters on order…no shot until glovebox closed & clean.

  3. Ultrasound cleaning not yet successful. • Ultrasound was used on a HIGHLY damaged Au GEM: • 40o, 18 MW-cm water. • 20 minutes each at four frequencies: • 40 kHz, 70 kHz, 140 kHz, 170 kHz • Dried in 10-6 torr vacuum overnight. • Positive effects, but not good enough. • GEM was among the most highly damaged in the HBD. • Measured non-linear current draw & confused the capacitance meter (250 nF !!). • After cleaning, the GEM looks beautiful. • Measures normal capacitance. • Draws non-linear current. • Further tests will be made on less severely damaged GEMs.

  4. Expected Schedule • Glove box is immaculate except for bad inlet HEPA filter. • Tent sparkles as well. • HBD vessel is ready. • GEMs are waiting in evaporator for the shot. • Shot can happen the day after the filter arrives (probably Thursday or Friday). • BIG QUESTION: Do we need to install shades components before closing up the glovebox?

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