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I would strongly support keeping all multiple-pass linac offsets consistent across passes. There is a linac multipass steering protocol I occasionally use to assess "straightness" of the linacs (deviation from "straight" thought to be due to long-term ground
motion). The various BPM readings for successive passes are fitted to instrumental offsets thought to be identical for all measurements from a given BPM can, as they use the same can and instrumentation chains.</div>
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Michael Tiefenback</div>
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<div dir="ltr" id="divRplyFwdMsg"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> BTeam <bteam-bounces@jlab.org> on behalf of Jay Benesch via BTeam <bteam@jlab.org><br>
<b>Sent:</b> Tuesday, April 8, 2025 15:29<br>
<b>To:</b> bteam@jlab.org <bteam@jlab.org><br>
<b>Subject:</b> [BTeam] SOF 5/19/24</span>
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<div style="font-size: 11pt;">Very strange assortment of zeroes and differences between higher and first linac passes. The linac SOFs labeled NL and SL are the long pulse average values. I am tempted to eliminate all the linac values except 1L and 2L. Comments?</div>
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<div dir="ltr" id="divRplyFwdMsg"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> BTeam <bteam-bounces@jlab.org> on behalf of Jay Benesch via BTeam <bteam@jlab.org><br>
<b>Sent:</b> Tuesday, April 8, 2025 15:29<br>
<b>To:</b> bteam@jlab.org <bteam@jlab.org><br>
<b>Subject:</b> [BTeam] SOF 5/19/24</span>
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<div style="font-size: 11pt;">Very strange assortment of zeroes and differences between higher and first linac passes. The linac SOFs labeled NL and SL are the long pulse average values. I am tempted to eliminate all the linac values except 1L and 2L. Comments?</div>
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