Difference between revisions of "Thermal Equilibrium Measurement Procedure"
From Hall A Wiki
(→Prepare Fridge:) |
|||
| (15 intermediate revisions by 2 users not shown) | |||
| Line 1: | Line 1: | ||
| − | |||
| − | + | ===Software=== | |
| − | + | To aid in the TE calculation, use the "te_getter.pl" script in the g2p_te folder on poltarg2p2. This script reads the last 'x' data entries before unixtime 'y' (default is current time). It produces a datafile for these points and asks if you'd like to use them in a TE measurement. Then it performs the TE calculation and returns the results. | |
===Assumptions:=== | ===Assumptions:=== | ||
| Line 9: | Line 8: | ||
*Magnet is at full field, persistent mode, leads are ramped down | *Magnet is at full field, persistent mode, leads are ramped down | ||
*Nose is full, run valve in manual mode | *Nose is full, run valve in manual mode | ||
| − | ===Prepare | + | ===Prepare Frig:=== |
| − | *Stop RB3, RB2, and RB1 (wait 2 | + | *Stop RB3, RB2, and RB1 (wait 2 minutes between each), if necessary |
| + | *Close roughing and bypass valve | ||
*Put Run Valve, EV91120, in Manual Mode | *Put Run Valve, EV91120, in Manual Mode | ||
| − | *Establish a STEADY Nose level somewhere between 65 | + | *Establish a STEADY Nose level somewhere between 50-65% |
| − | * | + | *Try 0.17 on the run valve. |
| + | *If needed only make slight changes to Run Valve for rest of TE (+/- 0.05 each 10 min) | ||
| + | |||
===Take a Baseline:=== | ===Take a Baseline:=== | ||
*Hit "Unlock Magnet Controls" button | *Hit "Unlock Magnet Controls" button | ||
| − | *Type the full-field current in the box labeled "Setpoint" (eg: | + | *Type the full-field current in the box labeled "Setpoint" (eg: 60.882) |
| − | *Type | + | *Type 3.00 into "Setrate" box, if necessary |
*Hit "To Setpoint" Button | *Hit "To Setpoint" Button | ||
*Wait for leads to reach full current (approx 1 min) | *Wait for leads to reach full current (approx 1 min) | ||
| Line 24: | Line 26: | ||
*Hit "Heater On" button | *Hit "Heater On" button | ||
*Wait for the 30 second timeout to expire | *Wait for the 30 second timeout to expire | ||
| − | *Type the baseline current into the "Setpoint" box (eg: | + | *Type the baseline current into the "Setpoint" box (eg: 59.882) |
*Hit "To Setpoint" to start the magnet sweeping | *Hit "To Setpoint" to start the magnet sweeping | ||
*Wait for magnet to reach baseline current (approx 6 min) | *Wait for magnet to reach baseline current (approx 6 min) | ||
| Line 31: | Line 33: | ||
*Hit the Baseline button | *Hit the Baseline button | ||
*Select "Create New Baseline", dialog box should then disappear | *Select "Create New Baseline", dialog box should then disappear | ||
| − | *Change sweeps to | + | *Change sweeps to 2000 if necessary |
*Double check that all NMR settings are where you want them | *Double check that all NMR settings are where you want them | ||
*Hit "One Point" button to take a single nmr measurement | *Hit "One Point" button to take a single nmr measurement | ||
| Line 39: | Line 41: | ||
*Document the details of the baseline in the logbook: | *Document the details of the baseline in the logbook: | ||
**Date Time, #Sweeps, MagCurrent, Top/Bottom, Gain, RFFreq, RFMod | **Date Time, #Sweeps, MagCurrent, Top/Bottom, Gain, RFFreq, RFMod | ||
| − | *Type full-field current into "Setpoint" box (eg: | + | *Type full-field current into "Setpoint" box (eg: 60.882) |
| − | *Type | + | *Type 3.00 into "Setrate" box, if necessary |
*Hit "To Setpoint" button | *Hit "To Setpoint" button | ||
| − | *Wait for magnet to reach full current | + | *Wait for magnet to reach full current |
*Hit "Hold" button | *Hit "Hold" button | ||
*Hit "Heater Off" button | *Hit "Heater Off" button | ||
| Line 51: | Line 53: | ||
*Make sure ladder is in desired target position | *Make sure ladder is in desired target position | ||
*Make sure NMR is on desired channel (AND in agreement with target position!) | *Make sure NMR is on desired channel (AND in agreement with target position!) | ||
| − | *Set sweeps to | + | *Make sure you have a STEADY Nose level with roughing and bypass valve closed |
| + | *Use ~0.17 on the run valve (watch the nose temps.) | ||
| + | *Set sweeps to 2000, if necessary | ||
*Hit "Take Data" button | *Hit "Take Data" button | ||
*Wait for timer to count down | *Wait for timer to count down | ||
*Write the following in the logbook for the next 10 measurements: | *Write the following in the logbook for the next 10 measurements: | ||
**Time, NMR Area, 4He Press, 4He Temp, 3He Press, 3He Temp, Nose Level | **Time, NMR Area, 4He Press, 4He Temp, 3He Press, 3He Temp, Nose Level | ||
| + | *Watch data until it flattens out, if in good warm (~1.5K) semi-steady state for a while then it should take less than 30 minutes. | ||
| + | *calculate the TE calibration constant using poltar@poltarg2p2$ /home/poltar/g2p_te/te_getter.pl 15 | ||
| + | *Type Y to run te_calc on this data | ||
| + | *Move the output file te_result.txt to te_date_top/bot.txt | ||
| + | *Put new Cal. Const. in under Sweeps in PDP and move on to prepare frig for polarization | ||
Latest revision as of 07:55, 17 April 2012
Software
To aid in the TE calculation, use the "te_getter.pl" script in the g2p_te folder on poltarg2p2. This script reads the last 'x' data entries before unixtime 'y' (default is current time). It produces a datafile for these points and asks if you'd like to use them in a TE measurement. Then it performs the TE calculation and returns the results.
Assumptions:
- NMR System is tuned
- Magnet is at full field, persistent mode, leads are ramped down
- Nose is full, run valve in manual mode
Prepare Frig:
- Stop RB3, RB2, and RB1 (wait 2 minutes between each), if necessary
- Close roughing and bypass valve
- Put Run Valve, EV91120, in Manual Mode
- Establish a STEADY Nose level somewhere between 50-65%
- Try 0.17 on the run valve.
- If needed only make slight changes to Run Valve for rest of TE (+/- 0.05 each 10 min)
Take a Baseline:
- Hit "Unlock Magnet Controls" button
- Type the full-field current in the box labeled "Setpoint" (eg: 60.882)
- Type 3.00 into "Setrate" box, if necessary
- Hit "To Setpoint" Button
- Wait for leads to reach full current (approx 1 min)
- Hit "Hold"
- Check that leads current and magnet current are equal
- Hit "Heater On" button
- Wait for the 30 second timeout to expire
- Type the baseline current into the "Setpoint" box (eg: 59.882)
- Hit "To Setpoint" to start the magnet sweeping
- Wait for magnet to reach baseline current (approx 6 min)
- Hit "Hold" button
- Put NMR into pause mode if necessary
- Hit the Baseline button
- Select "Create New Baseline", dialog box should then disappear
- Change sweeps to 2000 if necessary
- Double check that all NMR settings are where you want them
- Hit "One Point" button to take a single nmr measurement
- Wait for timer to count down
- Hit Baseline button
- Select the baseline you just took from the list of timestamps
- Document the details of the baseline in the logbook:
- Date Time, #Sweeps, MagCurrent, Top/Bottom, Gain, RFFreq, RFMod
- Type full-field current into "Setpoint" box (eg: 60.882)
- Type 3.00 into "Setrate" box, if necessary
- Hit "To Setpoint" button
- Wait for magnet to reach full current
- Hit "Hold" button
- Hit "Heater Off" button
- Wait for 30 second timeout to expire
- Hit "To Zero" to ramp the leads down
- Hit "Lock Magnet Controls" button
Take TE measurements:
- Make sure ladder is in desired target position
- Make sure NMR is on desired channel (AND in agreement with target position!)
- Make sure you have a STEADY Nose level with roughing and bypass valve closed
- Use ~0.17 on the run valve (watch the nose temps.)
- Set sweeps to 2000, if necessary
- Hit "Take Data" button
- Wait for timer to count down
- Write the following in the logbook for the next 10 measurements:
- Time, NMR Area, 4He Press, 4He Temp, 3He Press, 3He Temp, Nose Level
- Watch data until it flattens out, if in good warm (~1.5K) semi-steady state for a while then it should take less than 30 minutes.
- calculate the TE calibration constant using poltar@poltarg2p2$ /home/poltar/g2p_te/te_getter.pl 15
- Type Y to run te_calc on this data
- Move the output file te_result.txt to te_date_top/bot.txt
- Put new Cal. Const. in under Sweeps in PDP and move on to prepare frig for polarization
