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 11:24:34 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;"><h2>Tests performed</h2> <ul> <li>After leaving overnight noticed the pulser was not fully inserted into aida09 <ul> <li>Little change in rates observed in 9 but otherwise nothing else</li> </ul> </li> <li>Connected bias of aida02 (n+n ground) to aida06 (n+n ground) and likewise 4-8 <ul> <li>No change observed in rates</li> </ul> </li> <li>Also tested covering the snout in light tight material <ul> <li>No Changes</li> </ul> </li> <li>Unplugged the system monitor from 6 and 8, no change</li> <li>Connected the snout to ground with copper tape <ul> <li>Rates became very unpredictable in the FEEs unsure if this was snout grounding related though</li> <li>Removed the ground and powercycled and rates restored to where previously</li> </ul> </li> <li>Changed the bias supply jumper inside to have the bias line connected to the rack ground <ul> <li>At the same time noticed that the ground cable connecting the adaptor board of aida06 to the FEE had become disconnected from the ring terminal <ul> <li>Recrimped and inserted again</li> </ul> </li> <li>Saw an improvment in the rates of the p+n strips and also the n+n strips - attachment 1</li> <li>Pulser widths however larger than yesterday</li> </ul> </li> </ul> <h3>p+n width</h3> <table border="1" cellpadding="1" cellspacing="1" style="height:338px; width:253px"> <thead> <tr> <th scope="col">FEE</th> <th scope="col">Width</th> </tr> </thead> <tbody> <tr> <td>9</td> <td>118</td> </tr> <tr> <td>1</td> <td>88</td> </tr> <tr> <td>10</td> <td>75</td> </tr> <tr> <td>11</td> <td>77</td> </tr> <tr> <td>3</td> <td>67</td> </tr> <tr> <td>12</td> <td>66</td> </tr> <tr> <td>13</td> <td>96</td> </tr> <tr> <td>5</td> <td>89</td> </tr> <tr> <td>14</td> <td>107</td> </tr> <tr> <td>15</td> <td>93</td> </tr> <tr> <td>7</td> <td>118</td> </tr> <tr> <td>16</td> <td>87</td> </tr> </tbody> </table> <h3>n+n width</h3> <ul> <li>Connected up entire pulser circuit to n+n FEEs</li> </ul> <table border="1" cellpadding="1" cellspacing="1" style="height:132px; width:253px"> <thead> <tr> <th scope="col">FEE</th> <th scope="col">Width</th> </tr> </thead> <tbody> <tr> <td>2</td> <td>428</td> </tr> <tr> <td>4</td> <td>N/A</td> </tr> <tr> <td>6</td> <td>428</td> </tr> <tr> <td>8</td> <td>343</td> </tr> </tbody> </table> <h2>Switching bias supply back</h2> <ul> <li>because changes were made to the n+n ground, and the pulser circuit it was decided to go back and check the previous bias configuration with the module set in a floating configuration</li> <li>DAQ was then left overnight as had to leave to catch the bus</li> <li>Rates are observed to be back at their higher values - attachment 2</li> <li>n+n 1.8.L spectra - attachment 3</li> <li>p+n 1.8.L spectra - attachment 4</li> </ul> <h3>p+n widths</h3> <table border="1" cellpadding="1" cellspacing="1" style="height:338px; width:301px"> <thead> <tr> <th scope="col">FEE</th> <th scope="col">Wdith</th> </tr> </thead> <tbody> <tr> <td>9</td> <td>130</td> </tr> <tr> <td>1</td> <td>128</td> </tr> <tr> <td>10</td> <td>75</td> </tr> <tr> <td>11</td> <td>78</td> </tr> <tr> <td>3</td> <td>71</td> </tr> <tr> <td>12</td> <td>71</td> </tr> <tr> <td>13</td> <td>96</td> </tr> <tr> <td>5</td> <td>85</td> </tr> <tr> <td>14</td> <td>110</td> </tr> <tr> <td>15</td> <td>99</td> </tr> <tr> <td>7</td> <td>123 Dbl</td> </tr> <tr> <td>16</td> <td>92</td> </tr> </tbody> </table> <h3>n+n widths</h3> <table border="1" cellpadding="1" cellspacing="1" style="height:132px; width:298px"> <thead> <tr> <th scope="col">FEE</th> <th scope="col">width</th> </tr> </thead> <tbody> <tr> <td>2</td> <td>56</td> </tr> <tr> <td>4</td> <td>983</td> </tr> <tr> <td>6</td> <td>523</td> </tr> <tr> <td>8</td> <td>358</td> </tr> </tbody> </table> <ul> <li>The results show no improvment to slightly worse performance so will go back to having the bias module grounded internally and check the previous conclusions hold before making further changes</li> </ul> <h2>Return to grounded bias module</h2> <h3>Widths</h3> <p>p+n</p> <table border="1" cellpadding="1" cellspacing="1" style="height:377px; width:503px"> <thead> <tr> <th scope="col">FEE</th> <th scope="col">Width</th> </tr> </thead> <tbody> <tr> <td>9</td> <td>106</td> </tr> <tr> <td>1</td> <td>79</td> </tr> <tr> <td>10</td> <td>72</td> </tr> <tr> <td>11</td> <td>78</td> </tr> <tr> <td>3</td> <td>70</td> </tr> <tr> <td>12</td> <td>73</td> </tr> <tr> <td>13</td> <td>102</td> </tr> <tr> <td>5</td> <td>112</td> </tr> <tr> <td>14</td> <td>105</td> </tr> <tr> <td>15</td> <td>110</td> </tr> <tr> <td>7</td> <td>131</td> </tr> <tr> <td>16</td> <td>104</td> </tr> </tbody> </table> <p>n+n</p> <table border="1" cellpadding="1" cellspacing="1" style="width:500px"> <thead> <tr> <th scope="col">FEE</th> <th scope="col">Width</th> </tr> </thead> <tbody> <tr> <td>2</td> <td>-</td> </tr> <tr> <td>4</td> <td>298</td> </tr> <tr> <td>6-</td> <td>-</td> </tr> <tr> <td>8</td> <td>278</td> </tr> </tbody> </table> <ul> <li>Don't see a pulser peak in 4 or 2</li> <li>Will replace cable between 4 and 2 and 2 and 6</li> <li>Statistics at 0x64 with pulser on - atachment 5</li> <li>Now see peaks - attachment 6</li> <li>Statistics at 0xa - attachment 7</li> </ul> <table border="1" cellpadding="1" cellspacing="1" style="width:500px"> <thead> <tr> <th scope="col">FEE</th> <th scope="col">Width</th> </tr> </thead> <tbody> <tr> <td>2</td> <td>284</td> </tr> <tr> <td>4</td> <td>1089 (Triple)</td> </tr> <tr> <td>6</td> <td>371</td> </tr> <tr> <td>8</td> <td>318</td> </tr> </tbody> </table> <h3>With the grounded bias in place in the module move the braid cable to the frame rather than being connected to bias line</h3> <ul> <li>Still observe a triple peak in 4 and have worse perfromance in 2 and no improvement in p+n</li> <li>0x64 stats - attachment 7</li> <li>0xa statistics - attachment 8</li> <li>p+n 1.8.L - attachment 9</li> <li>p+n waveform - attachment 10</li> <li>n+n waveform - attachment 11 <ul> <li>Same high frequency component in both</li> <li>35 channel spacing corresponds to a frequency of ~1.4MHz</li> </ul> </li> </ul> <table border="1" cellpadding="1" cellspacing="1" style="width:500px"> <thead> <tr> <th scope="col">FEE p+n</th> <th scope="col">Width</th> </tr> </thead> <tbody> <tr> <td>9</td> <td>109</td> </tr> <tr> <td>1</td> <td>118</td> </tr> <tr> <td>10</td> <td>78</td> </tr> <tr> <td>11</td> <td>80</td> </tr> <tr> <td>3</td> <td>70</td> </tr> <tr> <td>12</td> <td>73</td> </tr> <tr> <td>13</td> <td>92</td> </tr> <tr> <td>5</td> <td>85</td> </tr> <tr> <td>14</td> <td>99</td> </tr> <tr> <td>15</td> <td>100</td> </tr> <tr> <td>7</td> <td>123</td> </tr> <tr> <td>16</td> <td>92</td> </tr> </tbody> </table> <table border="1" cellpadding="1" cellspacing="1" style="width:500px"> <thead> <tr> <th scope="col">FEE n+n</th> <th scope="col">Width</th> </tr> </thead> <tbody> <tr> <td>2</td> <td>531</td> </tr> <tr> <td>4</td> <td>1185 (Triple)</td> </tr> <tr> <td>6</td> <td>536</td> </tr> <tr> <td>8</td> <td>376</td> </tr> </tbody> </table> <h2>Next tests</h2> <ul> <li>Returned braid to FEE 4 and 8 <ul> <li>Recovered earlier rates and performance</li> </ul> </li> <li>Re-added the ground cable to the snout <ul> <li>Much worse noise performance across all FEEs</li> <li>p+n rates in 200k</li> </ul> </li> <li>Removed the ground from the snout <ul> <li>Got really good rates originally - attachment 12</li> <li>Noticed 1 and 5 failed ADC calibration</li> <li>Calibrated them and there rates increased massively - attachment 13</li> </ul> </li> <li>Notice that the pulser peak in FEE2 and 6 keeps dropping out <ul> <li>As the cables have been changed multiple times thought it could be that an adaptor board was broken</li> <li>4 seemed the most likely suspect with its high rates and triple peaks</li> <li>Replaced the adaptor board with one missing an outer ERNI pin (PIN doesn't interface with the FEE so didn't see any issues)</li> <li>Pulser peaks were still muissing</li> <li>Issue could be then with adaptor board 2 possibly</li> </ul> </li> </ul> <h1>Conclusions</h1> <ul> <li>Rates on the FEEs are in a better place now than they were at the start of the week <ul> <li>p+n in particular have shown a large amount of improvement</li> </ul> </li> <li>There are still however issues with the n+n FEEs</li> <li>I think there is likely an issue with one of the adaptor boards <ul> <li>Possible aida02 at the pulser connection point</li> <li>Could explain the triple peaking in aida04 and the pulser issues with aida02 and aida06 dropping out.</li> <li>Would recomend swapping out aida02 as a test next week</li> </ul> </li> <li>Other possible issues coiuld be the clingfilm around the cables has torn and we are grounding the cables to the inside of the snout <ul> <li>Nic would like to use something other than clingfilm in future</li> <li>One suggestion would be mylar which could be held in place with strips of double sided tape</li> <li>This would make the cables less likely to stick to each other which is an issue with the tightness of the snout</li> </ul> </li> <li>Could also try removing LK3 from FEE3 and 7 leaving the PCB ground floating</li> <li>I am at a slight loss of what else to try</li> </ul> <p> </p> <p> </p> <ul> <li>I have left the daq running at 0x64 overnight to check for alphas</li> <li>Histograms and statistics zeroed</li> </ul></td> </tr> </tbody> </table> </p><p> </p>
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