RF Absorption Measurements from Beam Pipe Coatings

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Presentation transcript:

RF Absorption Measurements from Beam Pipe Coatings Alexander Brown Allegheny College, Meadville, PA Yulin Li & Valery Shemelin Cornell University, Ithaca, NY

Non-Evaporable Getter Coating Gas Sources in Accelerator Vacuum Chambers Thermal Outgassing Accelerator Vacuum Pumping Lumped Pumping Distributed Pumping Total Pumping NEG Coating November 15, 2018November 15, 2018 Cornell LEPP Template

Deposition of NEG Thin Films Typical Sputtering Setup Cathode – Twisted wires Electric field (ion energy) ~ 600 V Magnetic field : 200 ~ 500 Gauss Sputtering gas : Ar or Kr P = 2 ~ 20 mtorr November 15, 2018November 15, 2018 Cornell LEPP Template

RF Absorption Measurements RF properties up to very high frequencies may have impact to short bunch electron performance RF absorption measurements of the NEG coating will be done with coated ceramic samples , f, GHz Dim’s of w/g, 0.001inches (mils) Max f, GHz /2 (mm) Max. Thickness 12.4 - 18 620 x 310 18 2.671 18 – 26.5 420 x 170 26.5 1.814 26.5 - 40 280 x 140 40 1.202 , November 15, 2018November 15, 2018 Cornell LEPP Template