2015/07/24 (Friday)
| 0945 | Fill LN2 cold trap full. |
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| Stop baking detectors. | |
| 1035 | Tower Temp at 31.5mK. Commence phonon pulse study. Remove all but one DCRC board (DCRC33 on DIB2), to look at the long noise trace that had not been done yesterday; zap twice. Add long trace plot to yesterday's page, as well as below. |
| DIB2 DCRC33 No Filter Noise Long Trace |
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| 1123 | Unpower and remove DCRC33 from DIB2. Attach DCRC33 with no filter to DIB1; zap twice. Find and set SQUID Bias and Lockpoints, as shown in table below. Estimate QET Biases by eye. Today continue studying pulse shapes for various DCRC/filter combos when only DIB1 has a DCRC plugged into it. Ethernet cable #2 was used for all combinations. For DCRC33 in DIB1 pulse events, trigger thresholds set to values in table below: |
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| DIB1 DCRC33 SQUID Settings | ||||
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| Channel | Bias (mA) | Lockpoint (mV) | Vpp (mV) | QET Bias (mA) |
| A | 78.13 | 6.03 | 422 | -98 |
| B | 82.04 | 4.48 | 446 | -110 |
| C | 87.9 | 4.09 | 508 | -107 |
| D | 87.9 | 3.79 | 492 | -98 |
| pA | 25 |
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| pB | 15 |
| pC | 25 |
| pD | 25 |
| 1155 | Unpower, add filter, and repower DCRC33 on DIB1; zap twice. Set up the board and increase the QET biases by 20uA on every channel in order to see proper pulses. |
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| DIB1 DCRC33 No Filter | ||
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| DIB1 DCRC33 Filter | ||
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| DIB1 DCRC33 No Filter Noise | ||
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| DIB1 DCRC33 Filter Noise | ||
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| 1158 | Unpower and remove DCRC33 from DIB1. Attach DCRC50 with no filter to DIB1; zap twice. Find and set SQUID Bias and Lockpoints, as shown in table below. Estimate QET Biases by eye. |
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| DIB1 DCRC50 SQUID Settings | ||||
|---|---|---|---|---|
| Channel | Bias (mA) | Lockpoint (mV) | Vpp (mV) | QET Bias (mA) |
| A | -80.08 | -6.03 | 328 | 82 |
| B | -83.98 | -4.28 | 248 | 95 |
| C | -86.00 | -3.31 | 378 | 85 |
| D | -87.89 | -3.40 | 383 | 105 |
| 1242 | Take pulse and noise pictures for DCRC50 in DIB1 with no filter. Use trigger thresholds listed below. |
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| pA | 20 |
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| pB | 20 |
| pC | 20 |
| pD | 20 |
| 1314 | Unpower, add filter, and repower DCRC50 on DIB1; zap twice. Set up the board and increase the QET biases by 20uA on every channel in order to see proper pulses. |
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| DIB1 DCRC50 No Filter | ||
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| DIB1 DCRC50 Filter | ||
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| DIB1 DCRC50 No Filter Noise | ||
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| DIB1 DCRC50 Filter Noise | ||
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| 1337 |
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| 1348 | Take pulse and noise pictures for DCRC55 in DIB1 with no filter. Use trigger thresholds listed below. Notice pulses look quite bad, with a shifting baseline. |
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| pA | 25 |
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| pB | 25 |
| pC | 25 |
| pD | 25 |
| 1451 | Unpower, add filter, and repower DCRC55 on DIB2; zap twice. Set up the board and increase the QET biases by 20uA on every channel in order to see proper pulses, except channel B which only worked with Output Gain set to 0 and QET Bias set to 116.8. During setting up, triangle wave appeared on channel B despite us not setting one. It was removed by typing wr 3c 0 into the putty session. |
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| DIB1 DCRC55 No Filter | ||
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| DIB1 DCRC55 Filter | ||
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| DIB1 DCRC55 No Filter Noise | ||
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| DIB1 DCRC55 Filter Noise | ||
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| 1501 | Unpower and remove DCRC55 from DIB1. Attach DCRC31 with no filter to DIB1; zap twice. Use SQUID settings and QET Biases found previously (see table below), except change Channel A QET Bias to -88.1. Frontend Gain and Output gain each set to 1. |
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| DIB1 DCRC31 SQUID Settings | |||
|---|---|---|---|
| Channel | Bias (mA) | Lockpoint (mV) | QET Bias (mA) |
| A | 86.09 | 6.03 | -88.1 |
| B | 80 | 6.42 | -90 |
| C | 82.04 | 4.18 | -87 |
| D | 83.99 | -3.12 | -73 |
| 1520 | Take pulse and noise pictures for DCRC31 in DIB1 with no filter. Use trigger thresholds listed below to avoid large noise present in lower threshold. |
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| pA | 45 |
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| pB | 45 |
| pC | 45 |
| pD | 45 |
| 1536 | Unpower, add filter, and repower DCRC31 on DIB2; zap twice. Set up the board and increase the QET biases by 20uA on every channel in order to see proper pulses. |
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| DIB1 DCRC31 No Filter | ||
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| DIB1 DCRC31 Filter | ||
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| DIB1 DCRC31 No Filter Noise | ||
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| DIB1 DCRC31 Filter Noise | ||
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| 1618 | Start warmup procedure by opening V9 and V5, and closing V13A. Stop 1K Pot and close V4. |
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| 1625 | Stop recovering 1K Pot pump and turn it off. Turn on mixing chamber heater. |
| 1908 | Close gate valve and V6. Current tower temperature at 12 K, and G2=803 mbar. Most/all of mixture has been recovered. |
| Barometric P = 29.82 inHg so corrected Dump P = 803+33.86*(29.82-29.92) = 800 mbar. | |
| Helium level at 12.2% and will thus not last the night. Stop recovering He and attach ping pong ball to main bath. | |
| 1915 | Close condenser speedivalve and V1. Fridge lines are now isolated. |
| 1917 | Tower temp at 13.4K. Isolate turbopump from pressure sensor. Pressure in lines leading up to IVC w/o pumping: 8.6E-6mbar. Open IVC, pressure rises to 1.6E-5mbar. Open turbopump to pump on IVC over weekend. |
| 1922 | Turn off MC and Still heaters. Isolate dump. |