LAPNMR Rack Mounted E-Log Book

• Timestamp: 6/24/2020 08:22:51 AM
• Name:: michael ross
• Notes:: 17.08 MHz, measuring hand sanitizers, pw = 4.1, attenuation = 32

• Timestamp: 6/30/2020 11:48:21 AM
• Name:: Michael Ross
• Notes:: Flow Proteus, freq = 20.37, attenuation = 32, pw = 7.8µs
  

• Timestamp: 7/08/2020 03:15:43 PM
• Name:: michael ross
• Notes:: flow magnet, pw = 5u for 26 db attenuation, freq = 19.33MHz

• Timestamp: 7/12/2020 02:13:56 PM
• Name:: michael ross
• Notes:: freq = 20.38mhz, pw = 5 µs, db = 26, checking avg gradient

• Timestamp: 7/12/2020 02:16:14 PM
• Name:: michael ross
• Notes:: checking gradient, flow setup, freq = 20.38 Mhz, pw = 5u, db = 26

• Timestamp: 7/16/2020 03:41:49 PM
• Name:: Michael Ross
• Notes:: Echo rephasing working on flow magnet, freq=20.38, pw=2.7 for dB 23

• Timestamp: 7/17/2020 11:54:25 AM
• Name:: michael ross
• Notes:: range check of flow gauge, improving sensitivity. Went up to 1600 ccm. freq = 20.38Mhz, db = 10, pw = 2 µs

• Timestamp: 7/21/2020 03:34:48 PM
• Name:: michael ross
• Notes:: improving sensitivity of flow proteus. freq = 20.49Mhz, db = 10, pw = 2 µs

• Timestamp: 7/28/2020 03:03:47 PM
• Name:: michael ross
• Notes:: improving sensitivity of flow proteus. freq = 20.49Mhz, db = 10, pw = 1.4 µs

• Timestamp: 7/29/2020 04:34:11 PM
• Name:: michael ross
• Notes:: average velocity/reynolds number measurement. freq = 20.48Mhz, db = 10, pw = 1.4 µs

• Timestamp: 8/11/2020 10:57:20 AM
• Name:: Jiangfeng Guo
• Notes:: Operation practice of CPMG, T1, and T1-T2 experiments for water, freq = 19.86 Mhz, pw = 9u.

• Timestamp: 8/12/2020 11:26:18 AM
• Name:: Devin Morin
• Notes:: Testing new coils on eraser phantom (9090). Pw from 1 us-11 us in 0.5 us intervals. 26 dB on attenuator 1 and 2. 15 dB on preamp Rf input.

• Timestamp: 8/18/2020 02:09:16 PM
• Name:: Michael Ross
• Notes:: Varying TE flow measurements, improving setup. Pw = 2.2µs for 10,16db, 20.45MHz

• Timestamp: 8/19/2020 03:14:21 PM
• Name:: Devin Morin
• Notes:: CPMG Atten1=23 dB, Atten2=29 dB. Pw from 1 us - 15 us . Preamp filter & attenuation removed.

• Timestamp: 8/20/2020 01:40:54 PM
• Name:: Devin Morin
• Notes:: CPMG Atten1=20 dB, Atten2=26 dB. Pw from 1 us - 10 us . Preamp filter & attenuation removed. Q of surface coil changed from 10 to 30.

• Timestamp: 8/25/2020 08:18:10 AM
• Name:: Devin Morin
• Notes:: CPMG - Testing surface probe w/ Atten1 at 20db and atten2 at 26db. Tried swapping quarter lambda cable and duplexer.

• Timestamp: 8/25/2020 03:36:47 PM
• Name:: michael ross
• Notes:: Changed coil in 19.87MHz proteus, and tuning matrix. for 16db pw = 6 µs

• Timestamp: 8/26/2020 10:20:15 AM
• Name:: Jiangfeng Guo
• Notes:: Operation practice of CPMG, T1, and T1-T2 experiments for eraser, freq = 19.87 Mhz, pw = 6u.

• Timestamp: 8/26/2020 01:42:25 PM
• Name:: Devin Morin
• Notes:: Testing surface coil with 9090 - pw from 1us - 10us with 0.5us intervals. 20dB of attenuation.

• Timestamp: 8/27/2020 11:43:30 AM
• Name:: Devin Morin
• Notes:: Testing surface coil with 9090 - pw from 1us - 10us with 0.5us intervals. 20dB of attenuation. Trying different quarter lambda cables and making new tuning box.

• Timestamp: 9/02/2020 03:12:00 PM
• Name:: Devin Morin
• Notes:: 2.26Mhz 9090 with 20dB and 0.8us pw

• Timestamp: 9/03/2020 01:59:00 PM
• Name:: Devin Morin
• Notes:: p9090 at 20dB testing 2.5Mhz with pw from 0.5us-12us in 0.5us intervals.

• Timestamp: 9/10/2020 03:27:00 PM
• Name:: Michael Ross
• Notes::

1. Flow Proteus 20.45 MHz, pw = 2.2µs for 10 and 16 db. Varying tau measurements at 200 ccm.

2. JIANGFENG READ THIS. Corrected scanning/mismatch issue with 19.87 Proteus Magnet, pw = 4.3 µs for 26 and 30 db. Look at the eraser measurements in your folder.

• Timestamp: 9/11/2020 11:36:00 AM
• Name:: Michael Ross
• Notes:: Log book from yesterday did not submit properly.

1. Varied tau flow measurements, pw = 2.2µs for 20.45MHz, 10 and 16 db.

2. JIANGFENG READ THIS. Fixed phasing/mismatch issue with 19.87 MHz magnet, 26 and 32 db. Look at eraser measurement under practice, Jiangfeng

• Timestamp: 10/01/2020 11:22:59 AM
• Name:: michael ross
• Notes:: flow data set at 4.5 cm/s, varied tau. freq = 20.45MHz, pw = 2.2u

• Timestamp: 10/09/2020 05:41:53 PM
• Name:: Andres Ramirez Aguilera
• Notes:: Testing Parallel-plate resonator with  PROTEUS magnet assemble at 20 MHz.
  
  Tx = 21dB,  Tx2 = 27dB
  Pw = 7us
  Sample: pink eraser
  

• Timestamp: 10/13/2020 03:33:12 PM
• Name:: michael ross
• Notes:: flow data set at 4.5 cm/s, varied tau. freq = 20.45MHz, pw = 2.2u. Issue with flowmeter leaking at valve, resulting in improper flow results. Will fix or look at replacing.

• Timestamp: 10/21/2020 05:11:10 PM
• Name:: Jiangfeng Guo
• Notes:: Flow data acquire, varied tau. freq = 20.46MHz, 10 and 16 db. pw = 2.35 us.  Last delay =250 ms.

• Timestamp: 10/23/2020 03:14:18 PM
• Name:: Jiangfeng Guo
• Notes:: Flow data acquire, varied tau. freq = 20.45MHz, 10 and 16 db. pw = 2.35 us.  Last delay =250 ms.

• Timestamp: 10/26/2020 05:59:26 PM
• Name:: Jiangfeng Guo
• Notes::  Flow data acquire, varied tau. freq = 20.45MHz/20.46MHz/20.47MHz, 10 and 16 db. pw = 2.35 us, NS=2048.  Last delay =250 ms.

• Timestamp: 10/29/2020 08:04:48 PM
• Name:: michael ross
• Notes:: freq = 20.35MHz, pw = 2.35u. Setup new flowmeter, built new coil.

• Timestamp: 11/06/2020 04:59:31 PM
• Name:: Jiangfeng Guo
• Notes:: Flow data acquire, varied tau. freq = 20.35MHz, 10 and 16 db. pw = 2.35 us, NS=1024.  Last delay =250 ms

• Timestamp: 11/12/2020 12:13:02 PM
• Name:: Jiangfeng Guo
• Notes:: Flow data acquire, varied tau. freq = 20.35MHz, 10 and 16 db. pw = 2.35 us, NS=1024.  Last delay =250 ms

• Timestamp: 11/13/2020 04:33:50 PM
• Name:: michael ross
• Notes:: Increased tilt in magnet, Freq = 19.84MHz, pw = 2.35u. Issue with tau variation seemed to stop.

• Timestamp: 11/17/2020 12:15:21 PM
• Name:: michael ross
• Notes:: Final paper data set. Flow data. Changed coil. 10db,16db, placed 22 db on preamp, removed over saturation issue. Freq = 20.42 MHz, pw = 2.9µs

• Timestamp: 11/20/2020 05:14:12 PM
• Name:: Jiangfeng Guo
• Notes:: Flow data acquire, varied tau. freq = 20.42MHz, 10 and 16 db. pw = 2.9 us, NS=1024.  Last delay =300 ms
  The flow rate showed on flowmeter changes with time for a fixed velocity flow. The flow rate changes from 120ccm to 80 ccm in 1 hour.

• Timestamp: 11/25/2020 04:11:52 PM
• Name:: Jiangfeng Guo
• Notes:: Flow data acquire for CuSO4 solution, varied tau. freq = 20.42MHz, 10 and 16 db. pw = 2.9 us, NS=1024.  Last delay =300 ms

• Timestamp: 11/26/2020 04:43:09 PM
• Name:: Jiangfeng Guo
• Notes:: Data acquire for stationary CuSO4 solution, varied tau. freq = 20.42MHz, 10 and 16 db. pw = 2.9 us, NS=1024.  Last delay =300 ms

• Timestamp: 12/02/2020 09:01:59 PM
• Name:: Jiangfeng Guo
• Notes:: Flow data acquire for CuSO4 solution, varied tau (from 0.1-1ms). freq = 20.42MHz, 10 and 16 db. pw = 2.9 us, NS=1024.  Last delay =300 ms

• Timestamp: 12/03/2020 03:37:54 PM
• Name:: michael ross
• Notes:: Flow data acquire for CuSO4 solution, varied tau (from 400-800µs). freq = 20.49MHz, 10 and 16 db. pw = 2.9 us, NS=1000.  Last delay =300 ms

• Timestamp: 12/04/2020 07:35:52 PM
• Name:: Jiangfeng Guo
• Notes:: T1 and CPMG meaurements, as well as flow data acquire for CuSO4 solution, varied tau (from 100-1000µs). freq = 20.47MHz, 10 and 16 db. pw = 2.9 us, NS=512.  Last delay =300 ms

• Timestamp: 12/05/2020 08:18:48 PM
• Name:: Jiangfeng Guo
• Notes:: T1 and CPMG meaurements, as well as flow （90ccm and 130ccm) data acquire for CuSO4 solution, varied tau (from 100-1000µs). freq = 20.47MHz, 10 and 16 db. pw = 2.9 us, NS=512.  Last delay =300 ms
  T2int=39ms, Diffusion=5.7865e-5 m^2/s. T1=50ms

• Timestamp: 12/08/2020 09:17:12 PM
• Name:: michael ross
• Notes:: changed flow viynl pipes, cleaned flowmeter, build new RF-coil. Tested it, seems to work, new G is around 50-55 gauss/cm compared to the old one (65 gauss/cm) this falls within range of simulation which had 60 gauss/cm. Freq = 20.49 MHz, pw = 2.9 µs, same attenuation as before. Control samples of different amounts of cupric sulfate to get 1/T1 v. Concentration. Field plots etc completed.

• Timestamp: 12/09/2020 09:35:16 PM
• Name:: Jiangfeng Guo
• Notes:: T1 and CPMG meaurements of stationary CuSO4 solution and distilled water.
  Flow  data acquire for CuSO4 solution, varied tau (from 100-1000µs). freq = 20.48MHz, 10 and 16 db. pw = 2.9 us, NS=512.  Last delay =300 ms

• Timestamp: 12/11/2020 02:19:48 PM
• Name:: Andres Ramirez Aguilera
• Notes:: Measuring a full LIB with the Proteus magnet (20.4 MHZ)
  Att1 = 21 dB; Att2 =27 dB
  pw = 7 us;
  scans = 1024;
  last delay =1s

• Timestamp: 12/12/2020 07:35:32 PM
• Name:: Jiangfeng Guo
• Notes:: Flow  data acquire for CuSO4 solution with new glass pipe, varied tau (from 200-1000µs). freq = 20.481MHz, 10 and 16 db. pw = 2.9 us, NS=512.  Last delay =300 ms

• Timestamp: 12/15/2020 09:34:01 PM
• Name:: Jiangfeng Guo
• Notes:: Flow  data acquire for CuSO4 solution with Xanthan gum, varied tau. freq = 20.481MHz, 10 and 16 db. pw = 2.9 us, NS=512.  Last delay =300 ms

• Timestamp: 12/21/2020 10:16:12 PM
• Name:: Andres Ramirez aguilera
• Notes:: Testing the Parallel-plate with the Proteus MAgnet 20.4MHz
  Atte = 15 db
  Atte2 = 21 db
  Atte Rx = 25 db
  pw = 12us
  Sample: 3 mL dopped water with CuSO4 , Full cell 1 mL electrolyte
  
  

• Timestamp: 12/22/2020 06:41:06 PM
• Name:: Jiangfeng Guo
• Notes:: Flow  data acquire
  Solution: 12L water; 2L Glycerol; 35 grams CuSO4 solid.
  T1 =70 ms
  CPMG measurements with varied tau and velocity. Freq = 20.481MHz, 16 and 22 db. pw = 4.0 us, NS=512.  Last delay =300 ms

• Timestamp: 12/28/2020 06:14:50 PM
• Name:: Jiangfeng Guo
• Notes:: Flow  data acquire
  Solution: 12L water; 2L Glycerol; 35 grams CuSO4 solid.
  T1 =70 ms
  CPMG measurements with varied tau and flowrate (6.2 and 11.4 ccm). Freq = 20.481MHz, 16 and 22 db. pw = 4.0 us, NS=512.  Last delay =300 ms

• Timestamp: 12/31/2020 05:16:22 PM
• Name:: Jiangfeng Guo
• Notes:: Solution: 12L water; 2L Glycerol; 35 grams CuSO4 solid.
  CPMG measurements for distilled water.
  CPMG measurements with varied tau and flowrate.  Freq = 20.502MHz, 16 and 22 db. dwell time= 3us, pw = 3.5 us, NS=256.  Last delay =300 ms

• Timestamp: 1/05/2021 06:05:13 PM
• Name:: Jiangfeng Guo
• Notes:: Solution: 12L water; 2L Glycerol; 35 grams CuSO4 solid.
  Find the optimal pulse length of 3.4 us using quadrature method.
  CPMG measurements with varied tau and flowrate.  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=512.  Last delay =300 ms.

• Timestamp: 1/13/2021 09:06:31 PM
• Name:: Jiangfeng Guo
• Notes:: Find the optimal pulse length of 3.2 us using quadrature method.
  T1 measurement; CPMG measurements with varied tau.  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=2048.  Last delay =300 ms.

• Timestamp: 1/14/2021 06:21:41 PM
• Name:: Jiangfeng Guo
• Notes:: Flow data acquisitions with varied tau.  pw=3.2 us, Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=512.  Last delay =300 ms.

• Timestamp: 1/17/2021 01:49:08 PM
• Name:: Jiangfeng Guo
• Notes::  Flow data acquisitions with varied tau.  pw=3.2 us, Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=512.  Last delay =300 ms.

• Timestamp: 1/18/2021 05:46:45 PM
• Name:: Jiangfeng Guo
• Notes:: Flow (100ccm) data acquisitions with varied tau.  pw=3.2 us, Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=512.  Last delay =300 ms.

• Timestamp: 1/21/2021 06:11:33 PM
• Name:: Jiangfeng Guo
• Notes:: Solution: 12L distilled water; 50 grams xanthan gum; 40 grams CuSO4 solid.
  Flow data acquisition with varied tau and flowrate.  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=512.  Last delay =300 ms. pw=3.2 us.

• Timestamp: 1/24/2021 07:00:44 PM
• Name:: Jiangfeng Guo
• Notes:: Solution: 12L distilled water; 50 grams xanthan gum; 40 grams CuSO4 solid.
  Flow data acquisition with varied tau and flowrate.  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=512.  Last delay =300 ms. pw=3.2 us.

• Timestamp: 1/25/2021 06:44:45 PM
• Name:: Jiangfeng Guo
• Notes:: Flow data acquisition with varied tau and flowrate.  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=512.  Last delay =300 ms. pw=3.2 us.

• Timestamp: 1/27/2021 04:21:11 PM
• Name:: Jiangfeng Guo
• Notes:: Flow data acquisition with varied tau and flowrate.  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=512.  Last delay =300 ms. pw=3.2 us

• Timestamp: 2/01/2021 04:16:51 PM
• Name:: Jiangfeng Guo
• Notes:: Solution preparation: 8 L previous xanthan gum solution, and 8 L distilled water
  T1 measurement : 68.7 ms;
  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=512.  Last delay =300 ms. pw=3.2 us.

• Timestamp: 2/08/2021 05:33:41 PM
• Name:: Jiangfeng Guo
• Notes:: Add 15 grams CuSO4 to the prepared xanthan gum solution.
  T1 measurement : 47.2 ms.

• Timestamp: 2/14/2021 03:57:55 PM
• Name:: Jiangfeng Guo
• Notes:: Solution preparation: 15 L distilled water, and 4.5 grams CuSO4
  T1 measurement : 467.8 ms;
  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=512. Pw=2.8 us.
  Flow measurements.

• Timestamp: 2/18/2021 06:22:54 PM
• Name:: Jiangfeng Guo
• Notes:: Doped distilled water flow experiments,
  T1 measurement : 450.8 ms;
  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=64. Pw=2.8 us.

• Timestamp: 2/22/2021 08:02:40 PM
• Name:: Jiangfeng Guo
• Notes:: Doped distilled water flow experiments,
  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=64. Pw=3.0 us.

• Timestamp: 2/24/2021 06:29:36 PM
• Name:: Jiangfeng Guo
• Notes:: Doped distilled water flow experiments at incomplete polarization,
  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=64. Pw=3.0 us.

• Timestamp: 3/01/2021 05:35:13 PM
• Name:: Jiangfeng Guo
• Notes:: Doped distilled water flow experiments at incomplete polarization,
  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=256. Pw=3.0 us.

• Timestamp: 3/03/2021 04:58:22 PM
• Name:: Jiangfeng Guo
• Notes:: Doped distilled water flow experiments at incomplete polarization,
  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=64. Pw=3.0 us.

• Timestamp: 3/10/2021 04:11:10 PM
• Name:: Jiangfeng Guo
• Notes:: 0.03% Doped 0.42% xanthan gum solution flow experiments at incomplete polarization,
  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=64. Pw=3.0 us.

• Timestamp: 3/17/2021 04:21:33 PM
• Name:: Jiangfeng Guo
• Notes::  0.03% Doped 0.42% xanthan gum solution flow experiments at incomplete polarization,
  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=64. Pw=3.0 us.

• Timestamp: 3/19/2021 05:40:13 PM
• Name:: Jiangfeng Guo
• Notes:: 0.03% CuSO4 distilled water  flow experiments at incomplete polarization,
  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=64. Pw=3.0 us.

• Timestamp: 3/26/2021 04:22:47 PM
• Name:: Jiangfeng Guo
• Notes:: 0.03% CuSO4 distilled water  flow experiments at incomplete polarization,
  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=64. Pw=3.0 us.

• Timestamp: 3/30/2021 04:12:47 PM
• Name:: Jiangfeng Guo
• Notes:: 0.03% CuSO4 distilled water  flow experiments at incomplete polarization,
  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=64. Pw=3.2 us.

• Timestamp: 4/02/2021 02:41:46 PM
• Name:: Jiangfeng Guo
• Notes:: 0.03% CuSO4 distilled water  flow experiments at incomplete polarization,
  Freq = 20.481MHz, attenuator 16 and 22 db. dwell time= 2 us, NS=64. Pw=3.2 us.

• Timestamp: 5/22/2021 02:30:45 PM
• Name:: Mike Gill
• Notes:: Practicing with 19.85MHz Proteus on CuSO_4 sample. pw 3.3us with att 20 and 14. Lab temp 21.5 C

• Timestamp: 5/23/2021 03:07:32 PM
• Name:: Mike Gill
• Notes:: The matching was off on the 20MHz proteus probe. Andres switched out the tuning circuit for a tuning box. The top plate of the box unscrews for easier access to the tuning and matching knobs.
  
  First go at taking measurements on small maple sticks. Very little signal as expected. Seemed to be signal corruption in the first ~150us of quad echo sequence. Similar corruption of first two echos in CPMG train.

• Timestamp: 7/05/2021 07:53:52 AM
• Name:: Ben Newling
• Notes:: Proteus magnet 19.899 MHz
  No hardware attenuators, 20 & 14 dB in Apollo.ini file, 3.3 us pulse. Eraser CPMG has 20-21 bits after 256 averages, T2 ~500 us
  Careful with the bare wires leading away from the probe: twisting them changes the tuning.

• Timestamp: 7/05/2021 12:05:27 PM
• Name:: Ben Newling
• Notes:: 9.04 AM out fridge. 5mins. wipe down to remove condensation.
  256 scans “maple wood day1” 21 bits… a little more signal than calibration
  256 scans “maple wood day1-II” immediate repeat looks the same
  wood left out at lab temp in magnet
  256 scans “maple wood day1 lunch” repeat at 1.05 PM

• Timestamp: 7/06/2021 07:36:41 AM
• Name:: Ben Newling
• Notes:: tune probe 19.899 MHz | setup as before, no hardware attenuation 14/20 dB Attenuator/Attenuator2 in Apollo.ini
  
  notice that the CPMG sequence actually has two different pulse lengths: not ideal for inhomogeneous field MR (AHOP never activated), so only one Attenuator value is being used
  
  8.16 maple twigs out of freezer. 5 mins. wipe down to remove condensation
  256 scans “maple wood day2” 21 bits… a little less signal than yesterday
  256 scans immediate repeat, no signal at all
  restart TNMR, reset hardware
  256 scans “maple wood day2-III” signal back, looks the same

• Timestamp: 7/06/2021 11:30:03 AM
• Name:: Ben Newling
• Notes:: 12.20
  256 scans “maple wood day2 lunch” 21 bits… looks unchanged from the morning. Back in the freezer 12.28.

• Timestamp: 7/07/2021 07:30:17 AM
• Name:: Ben Newling
• Notes:: July 7 2021
  
  tune probe 19.899 MHz, had to adjust at the tuning box - not convinced the matching is as good | setup as before, no hardware attenuation 14/20 dB Attenuator/Attenuator2 in Apollo.ini
  
  8.17 maple twigs out of freezer. 5 mins. wipe down to remove condensation
  256 scans “maple wood day3” 21 bits… slightly more signal than yesterday
  256 scans “maple wood day3-II” immediate repeat looks the same
  

• Timestamp: 7/07/2021 02:53:27 PM
• Name:: Ben Newling
• Notes:: 12.04
  256 scans “maple wood day3 lunch” 21 bits… looks unchanged from the morning. Back in the freezer 12.06.

• Timestamp: 7/12/2021 07:55:01 AM
• Name:: Ben Newling
• Notes:: tune probe 19.899 MHz, had to adjust at the tuning box - now using Transcoupler II (B),
  no hardware attenuation (except for 15 dB on pre-amp input)
  14/20 dB Attenuator/Attenuator2 in Apollo.ini
  
  
  256 scans “CPMG_eraser_256 echo_100u tau_1u dwell.tnt” give ~ 21 bits (actually slightly more signal than July 5, but within noise)
  
  8.35 twigs out of freezer. We intend leaving them out in the lab this week. 5 minutes allowed for thawing and then surface dabbed to remove concentration.
  
  Coil retuned then…
  256 scans “maple wood day8” 21 bits

• Timestamp: 7/12/2021 12:20:34 PM
• Name:: Ben Newling
• Notes:: 256 scans “maple wood day8 lunch” 21 bits (1.15 PM)

• Timestamp: 7/13/2021 07:20:10 AM
• Name:: Ben Newling
• Notes:: 8.12 x
  256 scans “maple wood day9” 19-20 bits evidence of suspicious large signal at end of echo train, acquisition hung at 255/256 (characteristic LapNMR misbehaviour)
  Hardware reset
  Rerun at 8.16.... nearer 21 bits: no misbehaviour, so saved this one
  Checked tuning - looks good

• Timestamp: 7/13/2021 10:40:50 AM
• Name:: Ben Newling
• Notes::
  11.33
  256 scans “maple wood day9 lunch” lab temp 22 C

• Timestamp: 7/14/2021 07:11:06 AM
• Name:: Ben Newling
• Notes::
  8.04
  256 scans “maple wood day10”  still about 21 bits, but T2 looks shorter

• Timestamp: 7/14/2021 11:12:32 AM
• Name:: Ben Newling
• Notes:: 12.06
  256 scans “maple wood day10 lunch”

• Timestamp: 7/15/2021 11:42:03 AM
• Name:: Ben
• Notes:: 12.29
  256 scans “maple wood day11”  looks less signal, but LapNMR artefact at end of decay
  Hardware reset
  256 scans “maple wood day11-II”  still looks less signal, but no LapNMR artefact
  [lab temp 22.5 C]

• Timestamp: 7/17/2021 11:10:52 AM
• Name:: Mike Gill
• Notes:: 19.89MHz Proteus. Tuning and Matching stable from Ben's previous session.
  
  Lab temp 22 C.
  
  Several CPMG measurements on rehydrated maple wood plus a new sample from freezer. Instrument well behaved but had to do hardware reset approx. once every 3 or 4 measurements.
  
  Used vacuum pump to rehydrate maple wood: 7 minutes on, 7 minutes off cycle.

• Timestamp: 8/13/2021 12:10:32 PM
• Name:: Mike Gill
• Notes:: 20 MHz Proteus. Unable to get signal and mismatch showing on consul. Checked setup from previous photo and, it appears like pre-amp was switched out since my last time in. Moved set-up to portable LapNMR in 113 and no mismatch but still able to get signal.

• Timestamp: 8/23/2021 02:24:07 PM
• Name:: Jiangfeng Guo
• Notes:: Proteus Magnet re-tested with doped distilled water experiments
  Freq = 20.54 MHz, attenuator 16 and 22 db. dwell time= 2 us, Pw=1.7 us.
  Good signals (high SNR) are detected.

• Timestamp: 8/24/2021 11:45:55 AM
• Name:: Maggie Lawrence
• Notes:: Used the Proteus magnet for flow measurements with doped distilled water. 20.54 MHz frequency, 5db and 15db attenuator, pw = 1.7 us.
  

• Timestamp: 8/24/2021 03:15:45 PM
• Name:: Maggie Lawrence
• Notes:: Update: The attenuator used today (August 24th 2021) was 16db and 22db, NOT 5db and 15db.
  
  From Jiangfeng: 15 dB on pre-amp input, 30 MHz LBP filter
  16/22 dB Attenuator/Attenuator2 in Apollo.ini

• Timestamp: 8/26/2021 01:17:40 PM
• Name:: Ben Newling
• Notes:: Tested CuSO4 calibration samples (3 x 5 mm NMR tubes) and
  eraser calibration sample
  with 20-MHz Proteus.
  
  Wrote new pulse sequences with equal-duration 90 and 180 degree pulses for CPMG (and a quadrature echo "QE... " that uses Attenuator2 (AHOP turned on as it is for the 90 in the equal-duration CPMG)
  
  Exact calibration of the 90 is tricky, but somewhere between 6 & 6.6 us is fine (Mike Ross used 6.6 us).
  
  [The problem for calibration is that long T2 samples have some long-lived signal that interferes with the first few echoes of the train (sometimes referred to as acoustic ringing), while short T2 samples have QE decays that disappear too fast (if you make tau long enough to clean up the first few echoes) to properly assess the relative amplitude of the first few echoes - which is the typical calibration approach. The amount of early perturbation seems to change if I reposition the sample, but that might be caused by the copper sheet covering the opening, which obviously gets moved if you move the sample.]
  
  I also moved the 30 MHz filter upstream of the pre-amplifier. I didn't see any great difference in my acquisition, but it makes more sense to me (unless the preamplifier is injecting noise).
  

• Timestamp: 8/27/2021 12:24:33 PM
• Name:: Mike Gill
• Notes:: Successful morning of measurements. Lab temp 22C.
  
  20MHz proteus tuning and matching really well. constructive noise issue seemed a little more frequent than usual, often appearing in two successive acquisitions.
  
  Set of CPMG measurements with CuSO4 to characterize the gradient, wood drying series with ends sealed with marine epoxy, and a set of varying tau measurements on wood sticks.

• Timestamp: 8/31/2021 11:25:52 AM
• Name:: Devin
• Notes:: Using the pre-amp at the redstone console since the small shireen pre-amp is not function for 2.4 MHz.

• Timestamp: 9/14/2021 11:10:31 AM
• Name:: Will
• Notes:: Switched the pre-amp in an attempt to recover SNR. Used the larger preamp from the redstone console, resulting in a 10-fold increase in SNR.

• Timestamp: 9/17/2021 07:49:59 PM
• Name:: Maggie
• Notes:: Used Proteus magnet for flow measurements with doped, distilled water. Moved the filtre from the RF input to the RF output on the pre-amp. freq=20.54MHz, pw=1.7us, 16/22 db attenuator/attenuator2 in apollo.ini. 15db attenuator on pre-amp input.

• Timestamp: 9/29/2021 02:23:35 PM
• Name:: Mike G
• Notes:: Wood cutting measurements.
  
  Tuning and matching of probe really stable.
  
  It seemed that after 90 minutes of measurements the "end noise artifact" began creeping up with increasing frequency. Powercycled preamp and consol to continue, but it kept returning. After resting the instrument for an hour at lunch, the artifact/issue disappeared until the 90 minute measurement time mark when it reared its ugly head once more.

• Timestamp: 10/04/2021 01:10:51 PM
• Name:: Florin
• Notes:: I shut down the acquisition PC and turned off the console.

• Timestamp: 10/05/2021 06:05:06 AM
• Name:: Florin
• Notes:: The electric power was restored at 6:40 a.m.; I turned back on the console and the acquisition laptop.

• Timestamp: 10/06/2021 01:44:33 PM
• Name:: Mike Gill
• Notes:: Further wood cutting measurements.
  
  20MHz Proteus. Tuning and matching are stable. Noticed I could hear the rf pulses on occasion, but they were very quiet and i could not tell if the sound was coming from the probe or the amplifier.
  
  The "constructive noise artifact" (CNF for short) was kept at a minimum today. Based on last week's session, I'm treating it as a duty cycle issue; I've reduced number of pulses and gave ~5 minutes between acquisitions.
  
  I recommend that anyone using this LapNMR console follow suit until the CNF is better diagnosed and understood.

• Timestamp: 10/06/2021 02:15:23 PM
• Name:: Mike Gill
• Notes:: Update to previous log:
  
  Pulse sound definitely coming from probe of the 20MHz Proteus, not the amplifier.

• Timestamp: 10/21/2021 08:56:45 AM
• Name:: Maggie Lawrence
• Notes:: Flow measurements done with the flow Proteus magnet. 16dB and 22dB attenuator/attenuator 2 in apollo.ini file. 15dB attenuator used on pre-amp. The TNMR app occasionally crashed on the computer during CPMG acquisitions.

• Timestamp: 10/21/2021 01:29:46 PM
• Name:: Mike G
• Notes:: Unable to run scans.
  
  "Error = 0x1f" (I think a generic windows driver error) popped up mid-scan. Also received "Hardware Error on Signal Averager!!" message.
  
  Maggie and Jiangfeng also received same errors this morning.
  
  Rebooted PC and turned off the tecmag console.
  
  When I tried relaunching TNMR, got the messages "unknown USB device" and "Signal Averager diver error". TNMR would only launch in processing mode.

• Timestamp: 10/21/2021 03:34:09 PM
• Name:: Ben
• Notes:: Turned off computer.
  Turned off LapNMR console.
  Removed all USB cables and reinserted them.
  Restarted LapNMR.
  Left for 5 mins.
  Restarted computer.
  Ran 256 scans of CPMG with no problem. (No magnet or probe in place, so don't know if there were any NMR signal, but the acquisition computer seemed to work.)
  Put computer to sleep, left everything else on. Let's see what happens.

• Timestamp: 10/28/2021 12:11:23 PM
• Name:: Devin Morin
• Notes:: Removed 10 dB attenuation on output of pre-amp and replaced it with a 30 mHz low-pass filter.

• Timestamp: 10/28/2021 03:39:47 PM
• Name:: Jiangfeng Guo
• Notes:: New magnet Devin modified test
  frequency = 16.40 MHz,
  pw=2.9 us
  flow-oriented gradient = 69 G/cm (calibrated by flow measurement)
  15 dB on pre-amp input, 30 MHz LBP filter
  16/22 dB Attenuator/Attenuator2 in Apollo.ini

• Timestamp: 11/23/2021 08:53:57 AM
• Name:: Maggie Lawrence
• Notes:: Used "Sandwich Magnet" with iron plates for flow measurements. 16db and 22db attenuators. T1 around 10ms, flow around 62mL/min, pw = 3.3 us. Had an air bubble in one of the pipes, fixed by Ben.

• Timestamp: 12/10/2021 02:27:52 PM
• Name:: Maggie and Ben
• Notes:: 20.54 MHz, flow proteus
  p90 2.6 us
  attenuators (Apollo.ini): 16 and 22 dB
  RG reduced to 1500 for CuSO4 (aq), T1 < 15 ms (estimated from sat-rec)
  Flow rate 1: 8 mL/min, 8 mL/min, 8 mL/min
  Flow rate 2: 11.9 mL/min, 11.9 mL/min, 11.6 mL/min

• Timestamp: 1/07/2022 10:05:10 AM
• Name:: Maggie
• Notes:: On January 6th, performed measurements with CuSO4 solution. T1 around 22ms. Changed out the 10dB attenuator before the RF amplifier while troubleshooting. pw of 2.6us. 16/22 dB attenuators 1/2.

• Timestamp: 1/09/2022 11:46:15 AM
• Name:: Maggie
• Notes:: On January 7th, changed solution to glycerol/water/copper sulfate solution. T1 around 90ms. Did flow measurements; pw of 2.6us, receiver gain 1500, attenuators 16db and 22db.

• Timestamp: 1/26/2022 10:18:12 AM
• Name:: Mike Gill
• Notes:: 20 MHz Proteus. pw 7.7us for software attenuation 20/26. Tuning is very stable thanks to Sebastian's upgrades to the probe casing.
  
  Still being haunted by the constructive noise artifact, even with fairly gentle settings. Measurements were clean for about 2 hours of scans before amplifier started to complain.