Log entry time 19:45:57 on January 11, 2009

Entry number 255483

This entry is a followup to: 255301

Followups:

• 255484 01/11/09 19:57 Jin Target -> Empty Position

Couple measurement Has been performed on target this evening:

1. Trans. Pick Up Coil Performance Test:
   Signal Noise Ratial of Transverse Coils is 50% +- 5% of that of 
Vertical ones. (20% noisier and 40% less sensitive)

2. A NMR Cross Calibration is performed

3. Spin Flip Using Field Rotation is tested to be working great
   Polarization Loss Rate of Spin Flip Using Field Rotation is < 200ppm
   Currently take 1s to flip. Could finish flip on the level of 
milliseconds.
   Should not be sensitive to field gradiant
   
4. Top Polarization of Last Spin up is 65.7%, spin up time = 3.82h
   Started at Halog 255301
   http://www.jlab.org/~adaq/halog/html/0901_archive/090110161506.html


--------------------- Time Line & Details --------------------- 


Start: 
	Cell Brady, Oven @ 230C
	3x Comet Laser pumping and several test after that
	5x amplication for all preamplifier
	

16:14  Laser OFF

===================================
      Trans. Pick Up Coil Performance Test
===================================
16:37  NMR Freq Sweep
	Data ID : NMR_Freq_He_20090111_163727
	-18.02 +- 0.07 mV for Sweep Up
	18.3 +- 0.07 mV for Sweep Down
	
16:38  Field -> Vert +

16:43  NMR Feq Sweep @ Vert
	Data ID : NMR_Freq_He_20090111_164306
	11.15 +- 0.06 mV for Sweep Up
	-10.99 +- 0.11 mV for Sweep Down

16:45  NMR Feq Sweep @ Vert
	Data ID : NMR_Freq_He_20090111_164527
	10.94 +- 0.07 mV for Sweep Up
	-10.86 +- 0.09 mV for Sweep Down

16:38  Field -> Trans -

16:49  NMR Feq Sweep @ Trans
	Data ID : NMR_Freq_He_20090111_164945
	-17.79 +- 0.06 mV for Sweep Up
	17.93 +- 0.07 mV for Sweep Down

===> Transverse Pickup Coil is ~20% noisier than Vertical one
===> Total Transverse NMR signal is 61% of that of Vertical one (It's 
reasonable, considering: one of the 2 trans. pickup coil is working, 
however the transverse coils are closer to cell)
===> Signal Noise Ratial of Transverse Coils is 50% of that of Vertical

===================================
      NMR Cross Calibration
===================================

17:00  NMR Freq Sweep @ Trans
	Data ID : NMR_Freq_He_20090111_170004

17:01  Field -> Long. +; Target -> Pick up

17:07  NMR Field Sweep @ Pickup
	Data ID : NMR_He_20090111_170721

17:08  Field -> Trans -; Target -> he3

17:14  NMR Freq Sweep @ Trans
	Data ID : NMR_Freq_He_20090111_171422


===================================
      Spin Flip via Field Rot.
===================================
17:24  1st Field Sweep @ Trans -
	Data ID : NMR_He_20090111_172450
	average of both NMR signal is 11.8mV

17:30  2nd Field Sweep @ Trans -
	Data ID : NMR_He_20090111_173022
	average of both NMR signal is 11.5mV

17:31  20 Field Spin Flip, 45Degree Step.
17:33  30 Field Spin Flip, 45Degree Step.

17:36  3rd Field Sweep @ Trans -
	Data ID : NMR_He_20090111_173022
	average of both NMR signal is 11.4mV

17:37  50 Field Spin Flip, 45Degree Step.

17:42  4th Field Sweep @ Trans -
	Data ID : NMR_He_20090111_173022
	average of both NMR signal is 11.25mV

17:44  1 Field Spin Flip, 45Degree Step.

17:44  5th Field Sweep @ Trans +
        Confirm Spin direction is reversed
	average of both NMR signal is -11.1mV

17:45  1 Field Spin Flip, 45Degree Step.

17:46  6th Field Sweep @ Trans -
	Data ID : NMR_He_20090111_174652
	average of both NMR signal is 10.7mV

===> Polarization Loss Rate of Spin Flip Using Field Rotation is < 
200ppm
===> He3 Spin Follow field direction well during field direction jump 
with same 25G field strenth (should follow up to 10kHz field change for 
25G holding field)
===> Could be a useful spin flip technique for future experiment with 
high rate spin flip and higher field gradiant. 

===================================
      Calib Field Sweep @ He3 Location
===================================
17:56 Laser Back

18:42  Freq Sweep before Field Sweep
	Data ID : NMR_Freq_He_20090111_184251
	-15.04mV sweep up
	15.06mV sweep down

18:43  Field Sweep
	Data ID : NMR_He_20090111_184321
	10.91mV Sweep up
	10.78mV Sweep down
	

18:44  Freq Sweep after Field Sweep
	Data ID : NMR_Freq_He_20090111_184251
	-14.79mV Sweep up
	14.73mV Sweep Down

===> Calibration Constant for Field Sweep is 3.83%/mV
===> Top Polarization of Last Spin up is 65.7%, spin up time = 3.82h