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Long,</div>
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One method that I have used in a similar situation is as follow: </div>
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<li><font color="#000000" face="Calibri, Arial, Helvetica, sans-serif"><span style="caret-color: rgb(0, 0, 0);">Target with cost A installed (Cost AA, weight WW)</span></font></li><li><font color="#000000" face="Calibri, Arial, Helvetica, sans-serif">User 1 sputters 2 microns </font></li><li><font color="#000000" face="Calibri, Arial, Helvetica, sans-serif">User 2 sputters 1 micron </font></li><li><font color="#000000" face="Calibri, Arial, Helvetica, sans-serif">User 3 sputters 4 microns </font></li><li><font color="#000000" face="Calibri, Arial, Helvetica, sans-serif">User ............... (and so on)</font></li><li><font color="#000000" face="Calibri, Arial, Helvetica, sans-serif">Target A has been consumed and replaced with Target H </font></li><li><font color="#000000" face="Calibri, Arial, Helvetica, sans-serif">Target A (what is remaining) is reclaimed in dollars (Cost BB, weight XX) </font></li></ol>
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Cost used = Cost AA - Cost BB </div>
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Metal used = Weight WW - Weight XX</div>
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Total microns sputtered = User 1 + User 2+ ...... </div>
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Cost per micron used = Cost used / Total microns sputtered </div>
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<span style="caret-color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">Cost per metal used = Metal used / Total microns sputtered </span><br>
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If one target tends to take longer than a fiscal year to be consumed than I would use the market price per weight. </div>
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If the target tends to get consumed within a few months then I would use the cost per micron from the previous cycle to charge the use today. </div>
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Of course this is not perfect, but it gives you a fair baseline I think. </div>
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Best,</div>
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Michael </div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> labnetwork-bounces@mtl.mit.edu <labnetwork-bounces@mtl.mit.edu> on behalf of Chang, Long <lvchang@Central.UH.EDU><br>
<b>Sent:</b> Thursday, June 4, 2020 11:50 AM<br>
<b>To:</b> labnetwork@mtl.mit.edu <labnetwork@mtl.mit.edu><br>
<b>Subject:</b> [labnetwork] How to charge for sputtering target use</font>
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<div class="" style="word-wrap:break-word; line-break:after-white-space">Hi All,
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<div class="">At UHNF, each user owns their own sputtering target. We are currently considering a shared model for expensive targets like Au, Pt, etc. Does anyone have a reasonable way to estimate material usage vs something we can track so that we can charge
fairly? What approaches do y’all take to manage how expensive material is shared?</div>
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<div class="">Thanks,<br class="">
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Long</div>
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