Difference between revisions of "Temperature optimization"
(New page: = Goal = To optimize temperature for 3He polarization. = Previous study = summer 2010, using cell Boris, done by John Donaghy et al, note available in paper = current run plan = <p> usi...) |
(→current run plan) |
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| Line 9: | Line 9: | ||
<p> using cell Boris. </p> | <p> using cell Boris. </p> | ||
<p> use three 30na coherent laser </p> | <p> use three 30na coherent laser </p> | ||
| + | <p> holding field 25Gs, phi 180 (or 0? depend on polarization) </p> | ||
<p> chose 8 pumping cell temp points from 180 to 250C </p> | <p> chose 8 pumping cell temp points from 180 to 250C </p> | ||
<p> Then step by step, we do: </p> | <p> Then step by step, we do: </p> | ||
Revision as of 18:21, 7 December 2010
Goal
To optimize temperature for 3He polarization.
Previous study
summer 2010, using cell Boris, done by John Donaghy et al, note available in paper
current run plan
using cell Boris.
use three 30na coherent laser
holding field 25Gs, phi 180 (or 0? depend on polarization)
chose 8 pumping cell temp points from 180 to 250C
Then step by step, we do:
1. adjust ovan to desired temperature and wait for it to be stable, then turn on laser
(laser will heat up, find the ovan temperature relation with desired pumping cell temp)
2. measure NMR every 2 hours for 12 times (1 day), 3He should reach max pol now.
3. measure EPR once.
4. measure AFP loss. turn off laser, measure NMR every 2 minutes for 5 times.
5. measure depolarization. keep laser off, measure NMR every 1 hour for 10 times.
