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<tr><td><b>Important Documents</b></td></tr>

<tr><td><b>Important Documents</b></td></tr>

<tr><td bgcolor="#e0e0f0">[[media:3DPrinterManual.pdf|3D Drawing ...1]]</td></tr>

<tr><td bgcolor="#e0e0f0">[https://zeus.phys.uconn.edu/halld/tagger/TAGM-4-2021/Protolabs_quote_6_2GeV_Move.pdf Protolabs Quote &rarr; 6.2 GeV Move]</td></tr>

<tr><td bgcolor="#e0e0f0">[[media:PLA_MSDS.pdf|3D Drawing ...2]]</td></tr>

<tr><td bgcolor="#e0e0f0">[https://zeus.phys.uconn.edu/halld/tagger/TAGM-4-2021/Top_Plate_6_2Gev.dwg Top-Plate_{(<i>3D CAD</i>)} &rarr; 6.2 GeV Move]</td></tr>

<tr><td bgcolor="#e0e0f0">[[media:ABS_MSDS.pdf|3D Drawing ...3]]</td></tr>

<tr><td bgcolor="#e0e0f0">[https://zeus.phys.uconn.edu/halld/tagger/TAGM-4-2021/Upstream_Bar_6_2Gev.dwg Upstream Bar_{(<i>3D CAD</i>)} &rarr; 6.2 GeV Move]</td></tr>

<tr><td bgcolor="#e0e0f0">[[media:Lab_419_Printer.pdf|3D Drawing ...4]]</td></tr>

<tr><td bgcolor="#e0e0f0">[https://zeus.phys.uconn.edu/halld/tagger/TAGM-4-2021/Downstream_Bar_6_2Gev.dwg Downstream Bar_{(<i>3D CAD</i>)} &rarr; 6.2 GeV Move]</td></tr>

<tr><td bgcolor="#e0e0f0">[[https://docs.google.com/document/d/1TfcPB16d2L3PRFAXlTW4cL5QBGmv2FN2DODGC_htHYE/edit?usp=sharing | Some Logbook ...]]</td></tr>

<tr><td bgcolor="#e0e0f0">[https://zeus.phys.uconn.edu/halld/tagger/TAGM-4-2021/Bundle-Support-4-2021.xlsx TAGM Move Calculation Spreadsheet]</td></tr>

<tr><td bgcolor="#e0e0f0">[https://zeus.phys.uconn.edu/halld/tagger/TAGM-4-2021/TAGM_9_2GeV_Bundle_Rod_Fit.C C++ File &rarr; Fit mounting rod positions]</td></tr>

<tr><td bgcolor="#e0e0f0">[https://zeus.phys.uconn.edu/halld/tagger/TAGM-4-2021/TAGM_Weights.C C++ File &rarr; List of current rod positions fit eqns.]</td></tr>

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                   <th colspan="2"; align="center" valign="top"; style="background-color:rgb(124,185,232); font-size:13px">New Coordinates</th>

                   <th colspan="2"; align="center" valign="top"; style="background-color:rgb(124,185,232); font-size:13px">Updated 2017 Coordinates</th>

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                   <th colspan="2"; align="center" valign="top"; style="background-color:rgb(244,143,177); font-size:15px">e^- focal plane crossing</th>

                   <th colspan="2"; align="center" valign="top"; style="background-color:rgb(244,143,177); font-size:15px">e^- Focal Plane Crossing</th>

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                   <th colspan="2"; align="center" valign="top"; style="background-color:rgb(244,143,177); font-size:11px"><em>(for e^- passing through the</em></th>

                   <th colspan="2"; align="center" valign="top"; style="background-color:rgb(244,143,177); font-size:11px"><em>(for e^- that will pass through the</em></th>

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         <td align="right" valign="top">Y_FP = </td><td align="left" valign="top">0.0 m</td>

         <td align="right" valign="top">Y_FP = </td><td align="left" valign="top">0.0 m</td>

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         <td align="right" valign="top">E_&gamma; = </td><td align="left" valign="top">9.201 GeV</td>

         <td align="right" valign="top">E_&gamma; = </td><td align="left" valign="top">9.201 GeV</td>

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==Bundle Support (aka Popsicle Stick)==

==Bundle Support (a.k.a. Popsicle Stick)==

The Tagger Microscope (TAGM) contains 17 optical fiber bundle, each consists of a 5x6 array of 30 fibers for a total of 510 fibers (5 rows, 102 columns). Figure 2 below shows the fiber array as viewed by the electrons passing through the tagger magnet focal plane. Each optical fiber consists of a 2 mm² x 2 cm BCF-20 scintillating fiber (SciFi) thermally fused to 2 mm² x 165 cm BCF-98 light guide, see Figures 3 & 4. The SciFi end of each fiber is thermally bent into an "S" shape to remove the fiber from the electrons' path soon after passing through the SciFi, see Figure 5. The fiber begins its bend out of the electrons' path after only 4.5 cm. This length provides enough material past the fused joint to minimize strain on the joint resulting from the bend and fiber mounting straps, while also reducing the material in the line-of-fire that could result in backscatter.

The Tagger Microscope (TAGM) contains 17 optical fiber bundle, each consists of a 5x6 array of 30 fibers for a total of 510 fibers (5 rows, 102 columns). Figure 2 below shows the fiber array as viewed by the electrons passing through the tagger magnet focal plane. Each optical fiber consists of a 2 mm² x 2 cm BCF-20 scintillating fiber (SciFi) thermally fused to 2 mm² x 165 cm BCF-98 light guide, see Figures 3 & 4. The SciFi end of each fiber is thermally bent into an "S" shape to remove the fiber from the electrons' path soon after passing through the SciFi, see Figure 5. The fiber begins its bend out of the electrons' path after only 4.5 cm. This length provides enough material past the fused joint to minimize strain on the joint resulting from the bend and fiber mounting straps, while also reducing the material in the line-of-fire that could result in backscatter.

   

   

===<u>Popsicle Stick Limitations</u>===

===<u>Popsicle Stick Limitations</u>===

Placing the "Pivot Point" on the focal plane and only allowing +0.5 cm towards the tagger magnet the maximum crossing angle for the current bundle support design is &beta;_max = 19.51^o, while the minimum angle is &beta;_min = 4.05^o. This does not account for the most forward bundle mounting strap clamp and bolts, but they are lower in Z_FP than the fibers and should not extend significantly past the 0.5 cm limit even at lower &beta; angles.

Placing the "Pivot Point" on the focal plane and only allowing +0.5 cm towards the tagger magnet the maximum crossing angle for the current bundle support design is &beta;_max = 19.51^o, while the minimum angle is &beta;_min = 4.05^o. This does not account for the most forward bundle mounting strap clamp and bolts, but they are lower in Z_FP than the fibers and should not extend significantly past the 0.5 cm limit even at lower &beta; angles.

==Calculating Position of Each Bundle Support Mounting Rod==

==Calculating Position of Each Bundle Support Mounting Rod==

Once the &beta; angle for the first (upstream) bundle support is set, derived from the the starting photon tag energy, each subsequent bundle support has a &beta; angle offset from the previous one by a tow angle. Thus, as we look downstream from one bundle support to the next, the &beta; angles differ by -(tow angle). Adjacent bundle supports will come in contact with one another at the SciFi end and form a triangular gap along their adjacent sides based on the tow angle.

Once the &beta; angle for the first (upstream) bundle support is set, derived from the the starting photon tag energy, each subsequent bundle support has a &beta; angle offset from the previous one by a tow angle. Thus, as we look downstream from one bundle support to the next, the &beta; angles differ by -(tow angle). Adjacent bundle supports will come in contact with one another at the SciFi end and form a triangular gap along their adjacent sides based on the tow angle.

An Excel [/nfs/direct/annex/mcintyre/TAGM-4-2021/Bundle-Support-4-2021.xlsx spreadsheet(placeholder)] has been created to calculate the location of the bundle supports' mounting rods with respect to the focal plane coordinate system. This spreadsheet also calculates the length of the parallel railing end supports which need to be fabricated anew for each unique TAGM location on the focal plane. One last, but very important thing that the spreadsheet calculates is the shim size needed, during TAGM realignment, in order to achieve the proper tow angle between bundle supports during mounting. In addition to the spreadsheet, an AutoCAD [https://zeus.phys.uconn.edu/wiki/index.php/Student_Projects_in_Nuclear_Physics drawing(placeholder)] used to design the three parallel rail components needed for each unique tagging energy spectrum starting position of the TAGM and a [https://zeus.phys.uconn.edu/wiki/index.php/Student_Projects_in_Nuclear_Physics drawing(placeholder)] for the current setup (&beta; = 12.5^o to 11.06^o). These files are in US standard units (inches) and to scale with a tolerance of &plusmn; 0.001 inch.   

An Excel [https://zeus.phys.uconn.edu/halld/tagger/TAGM-4-2021/Bundle-Support-4-2021.xlsx spreadsheet] has been created to calculate the location of the bundle supports' mounting rods with respect to the focal plane coordinate system. This spreadsheet also calculates the length of the parallel railing end supports which need to be fabricated anew for each unique TAGM location on the focal plane. One last, but very important thing that the spreadsheet calculates is the shim size needed, during TAGM realignment, in order to achieve the proper tow angle between bundle supports during mounting. In addition to the spreadsheet, an AutoCAD [https://zeus.phys.uconn.edu/halld/tagger/TAGM-4-2021/Parallel_Railing_Parts.dwg drawing] used to design the three parallel rail components needed for each unique tagging energy spectrum starting position of the TAGM and a [https://zeus.phys.uconn.edu/halld/tagger/TAGM-4-2021/Beta-Angle12_5-to-11_06deg_modified.dwg drawing] for the current setup (&beta; = 12.5^o to 11.06^o). These files are in US standard units (inches) and to scale with a tolerance of &plusmn; 0.001 inch.   

[[Image:e_path_in_Bundle.png|center|thumb|800px|Figure 16: Sketch showing the path of electrons that pass through the center of the fiber columns near the focal plane. At the back-end of the 2 cm. SciFi a misalignment of around 0.03 mm (with respect the the fiber's axis) results from using an averaged &beta; angle for the bundle support location.]]

[[Image:e_path_in_Bundle.png|center|thumb|800px|Figure 16: Sketch showing the path of electrons that pass through the center of the fiber columns near the focal plane. At the back-end of the 2 cm. SciFi a misalignment of around 0.03 mm (with respect the the fiber's axis) results from using an averaged &beta; angle for the bundle support location.]]

==TAGM Move for a 6 GeV E_&gamma; Starting Point==

==TAGM Move Parameters for various E_&gamma; Starting Points==

Using the calculations explained in [https://zeus.phys.uconn.edu/wiki/index.php/Calculating_the_move "Calculating the move" wiki page], the following parameters for a 6 GeV maximum tagged photon energy were determined.

Using the calculations explained in [https://zeus.phys.uconn.edu/wiki/index.php/Calculating_the_move "Calculating the move" wiki page], the following parameters for a 6 GeV maximum tagged photon energy were determined.

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               <td align="left" valign="top">Rear Rail Pitch = </td> <td align="center" valign="top"> 0.118</td> <td align="left" valign="top"> degrees</td>

               <td align="left" valign="top">Rear Rail Pitch = </td> <td align="center" valign="top"> 0.118</td> <td align="left" valign="top"> degrees</td>

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