[Moller] new collimator material?

[Roger Carlini]

We considered this and other compounds of tunsten for the Qweak collimator. What we decided upon is the matetial I suggested to Kent for PREX. It is inexpensive, machinable, can be easily brazed (so you can attach a water cooling jacket) and ONLY composed of Cu and Tungsten. These other composites are very expensive, not easy to machine and more importantly have other elements that might screw up a PV measurement.RogerSent from my Verizon 4G LTE smartphone

-------- Original message --------
From: Jay Benesch <benesch at jlab.org> 
Date: 10/20/18  5:07 AM  (GMT-08:00) 
To: moller at jlab.org, Greg Smith <smithg at jlab.org> 
Subject: [Moller] new collimator material? 

90W10Cu might still be preferred, but someone competent might glance at these articles in Naturehttps://www.nature.com/articles/d41586-018-07005-9The final object is formed of approximately 58% ZrC ceramic and 36% tungsten metal, with small amounts of residual tungsten carbide and copper. The beauty of the method is that the porous preform is converted into a non-porous ZrC/tungsten composite of the same dimensions (the overall volume change is approximately 1–2%).https://www.nature.com/articles/s41586-018-0593-1Ceramic–metal composites for heat exchangersHere we present a robust composite of ceramic (zirconium carbide, ZrC) and the refractory metal tungsten (W) for use in printed-circuit-type heat exchangers at temperatures above 1,023 kelvin9. This composite has attractive high-temperature thermal, mechanical and chemical properties and can be processed in a cost-effective manner._______________________________________________Moller mailing listMoller at jlab.orghttps://mailman.jlab.org/mailman/listinfo/moller
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