AIDA
GELINA
BRIKEN
nToF
CRIB
ISOLDE
CIRCE
nTOFCapture
DESPEC
DTAS
EDI_PSA
179Ta
CARME
StellarModelling
DCF
K40
DESPEC
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Sat Mar 29 11:27:47 2025
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<p> <table width="98%" align="center" cellspacing="1" style="border:1px solid #486090;"> <tbody> <tr> <td cellpadding="3px" style="background-color:#486090; font-weidht:bold; color:white;">Quote:</td></tr> <tr> <td cellpadding="10px" style="background-color:#FFFFB0;"><h1>Grounding implemented</h1> <ul> <li>Each FEE given direct connection to heavy duty earth bar via adaptor board lemo ground</li> <li>Earth bars are then connected to platform ground on AIDA frame</li> <li>Photo of grounding - attachment 1</li> <li>Improvements not as large as expected from previous experience though <ul> <li>Particularly in the n+n side where widths still appear awful</li> </ul> </li> <li>While implementing the grounding it was noticed the ground lemo socket on FEE7 was damaged and no longer gripped onto a lemo cable <ul> <li>It was noted that it would need changing at some point but continued with it for the time being</li> </ul> </li> <li>Jumper configuration was n+n LK1-4 all on, p+n LK2-4 all on</li> </ul> <h2>p+n widths</h2> <table border="1" cellpadding="1" cellspacing="1" style="height:338px; width:254px"> <thead> <tr> <th scope="col">FEE</th> <th scope="col">Width</th> </tr> </thead> <tbody> <tr> <td>9</td> <td>147</td> </tr> <tr> <td>1</td> <td>116</td> </tr> <tr> <td>10</td> <td>92</td> </tr> <tr> <td>11</td> <td>77</td> </tr> <tr> <td>3</td> <td>128</td> </tr> <tr> <td>12</td> <td>72</td> </tr> <tr> <td>13</td> <td>75</td> </tr> <tr> <td>5</td> <td>59</td> </tr> <tr> <td>14</td> <td>75</td> </tr> <tr> <td>15</td> <td>80</td> </tr> <tr> <td>7</td> <td>150</td> </tr> <tr> <td>16</td> <td>75</td> </tr> </tbody> </table> <ul> <li>Compared to the width with no grounding the FEEs for the first DSSD (First 6) range from no change to slightly worse</li> <li>1.8.L spectra - attachment 3</li> </ul> <h2>n+n widths</h2> <ul> <li>Widths still very large</li> <li>Width for 8 is around 500</li> <li>1.8.L attachment 2</li> </ul> <h2>Additional info</h2> <ul> <li>Statistics - attachment 4</li> </ul> <h1>Jumper optimisation</h1> <ul> <li>Went to our previously found optimal jumper configuration for the trips</li> <li>n+n LK1 only</li> <li>p+n LK 2 and 4 on all FEE</li> <li>p+n LK3 on non isolated cables (PCB ground on lower middle cable and n+n side bias on top middle cable)</li> <li>While changing the jumpers we also swapped out the damaged adaptor board on aida07 for a new one</li> <li>Saw an improvement for most FEEs</li> </ul> <table border="1" cellpadding="1" cellspacing="1" style="height:338px; width:275px"> <thead> <tr> <th scope="col">FEE</th> <th scope="col">Width</th> </tr> </thead> <tbody> <tr> <td>9</td> <td>134</td> </tr> <tr> <td>1</td> <td>83</td> </tr> <tr> <td>10</td> <td>80</td> </tr> <tr> <td>11</td> <td>68</td> </tr> <tr> <td>3</td> <td>60</td> </tr> <tr> <td>12</td> <td>60</td> </tr> <tr> <td>13</td> <td>71</td> </tr> <tr> <td>5</td> <td>60</td> </tr> <tr> <td>14</td> <td>75</td> </tr> <tr> <td>15</td> <td>82</td> </tr> <tr> <td>7</td> <td>97</td> </tr> <tr> <td>16</td> <td>77</td> </tr> </tbody> </table> <ul> <li>Unfortunately saw no improvement for the n+n</li> <li>We event tested having the pulser only going into a single FEE (aida08)</li> <li>Still have a width of 622 for that FEE</li> <li>To compare FEEs we have layout 1 - attachment 5</li> <li>Layouot 1 on a common timescale - attachment 6 <ul> <li>Note that the rate is typically dominated by a single strip or a couple of strips within a FEE</li> <li>Many channels are just showing the pulser rate 25Hz</li> </ul> </li> <li>p+n 1.8.L attachment 7</li> <li>p+n waveforms attachment 8</li> <li>n+n waveforms attachment 9</li> <li>Testing the noise on the n+n strips we observe noise with slow comparator set to 200 (2MeV)</li> <li>Meanwhile the p+n strips are silent at 0x64 for the most part.</li> <li>DAQ left running overnight with 0x64 on ASIC settings to see if we observe any alphas</li> </ul> <h1>Plan for the day</h1> <ul> <li>Test daisy chaining the n+n across to the other n+n strips <ul> <li>Currently the n+n braid is only plugged into either aida06 or aida08 (depending on DSSD)</li> <li>All of the jumpers are however grounded</li> <li>Will still test</li> <li>May investigate also trying this on LK3 on adaptors for aida01 and aida03</li> </ul> </li> <li>Observe the output of the new sum inverter on the scope to check for variation in amplitude</li> </ul></td> </tr> </tbody> </table> </p><p> </p>
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