Make New Entry, Make Followup Entry
User name Yi Qiang
Log entry time 11:20:13 on April 27, 2009
Entry number 269074
This entry is a followup to: 269032
keyword=3He spin rotated to back to Vertical-: Pumping Chamber NMR Polarization: 22%I rotated the field back to vertical - direction and then turned ON the
lasers.
After temperature got stabilized, a NMR was performed and measured only
22% polarization in the pumping chamber which is only 22%/61% = 35% of
the number before the longitudinal run. However, by comparing the NMR
signals from the target chamber pickup coils give different ratios,
Upstream coil X channel: 0.82mV/1.48mV = 55%
Downstream coil X channel: 1.02mV/1.74mV = 59% .
They are much larger than the 35% at pumping chamber, so there much be
some reason causing the pumping chamber depolarizes much faster than
target chamber, maybe temperature, masing?
A copy of this log entry has been emailed to: jpchen, jinhuang
NMR After
NMR Before
Field Rotation
