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<span>Dear All:</span>
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<p style="margin-top:0; margin-bottom:0"><span>We will have our bi-weekly A1n/d2n meeting tomorrow (Tuesday August 27th) at 2:30pm. For people at JLab we have reserved room CC L207. Bluejean information is pasted at the end of this email.</span><span></p>
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<span><span>Meeting minutes can be found at:</span><span> <a href="https://hallcweb.jlab.org/experiments/A1n/meetings/A1n_hallc_minutes.ht" class="x_x_OWAAutoLink" id="LPlnk21889" previewremoved="true">https://hallcweb.jlab.org/experiments/A1n/meetings/A1n_hallc_minutes.html</a></span></span></div>
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<span>Here is a proposed agenda. Please feel free to send me any topics I may have missed:</span></div>
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<span>1) target test status (can be reported by Junhao and Mingyu, or myself)<br>
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<span>2) target cell production status (anyone from UVa? Otherwise myself)</span></div>
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<span>3) raster - if any - Mark</span></div>
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<span>4) Moller?</span></div>
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<span>5) optics - angle calibration at 1-pass? - Jixie<br>
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<span>6) software/analysis meeting -- Brad? Syvelster?</span></div>
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<span>7) Target field gradient calculation, details below (sorry it's a bit long):<br>
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<span>- Gordon would like to repeat the target field gradient calculation for the highest x setting, which is 30 deg for HMS and SHMS. After I sent magnet currents settings (calculated by Syvelster) to Steve, Steve said it is very time consuming to remodel
the SHMS for 30 deg. In previous study of the highest SHMS momentum setting, in his words:
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<p style="margin-top:0;margin-bottom:0;">"Only the SHMS HB magnet and the nearby steel structure has been modeled at 12.5 degrees. The iron down-stream beam support arm can be "turned off" to approximate the 30 degree setting. Then the Helm-Holtz coils can
be rotated relative to the SHMS HB angle in the model.</p>
<p style="margin-top:0;margin-bottom:0;">The HMS Q1 has it own separate Tosca model and its fields are just simply added to the Helm-Holtz coil's fields.</p>
<p style="margin-top:0;margin-bottom:0;">No other magnets have been included in the previous results. Tosca models for all SHMS and HMS magnets exist, but they are far enough away from the target region that they have no influence at the target."</p>
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<p style="margin-top:0;margin-bottom:0;">So what I'd like to propose, along with questions:</p>
<p style="margin-top:0;margin-bottom:0;">1) For the previous 12.5 deg high momentum setting, add HMS Q1 (I think this was what Thia wanted us to do);</p>
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<p style="margin-top:0;margin-bottom:0;">2) For the 30 deg high x setting, model HMS Q1 and SHMS HB along with steel structure at 12.5 deg but with the new current settings. Then rotate the modeled fields by 17.5 deg to mimic the situation at the target location
for 30 deg setting. The question here is how much "turning off the <span>iron down-stream beam support arm" will affect the accuracy of the results? (this is my main question)</span><br>
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<span>-One way to figure out the effect of the beam support is to do the 12.5 deg high mometum setting, turn of the iron down-stream beam support arm and compare results.
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<span>3) Or, given time needed by the above target field work, can we forgo the calculation and rely on in-situ measurement instead? Perhaps we can do this during installation, just turn on all spectrometer magnets, rotate them to the correct angles (12.5
and 30 deg), and measure the field on the target pivot? <br>
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<p style="margin-top:0; margin-bottom:0"><span>Thanks,<br>
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<p style="margin-top:0; margin-bottom:0"><span>- Xiaochao<br>
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<div>Meeting URL<br>
https://bluejeans.com/4342434032/7479<br>
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Meeting ID<br>
434 243 4032<br>
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Participant Passcode<br>
7479<br>
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Dial one of the following numbers:<br>
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Enter the meeting ID and passcode followed by #<br>
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Dial: bjn.vc or 199.48.152.152 and enter your meeting ID & passcode</div>
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