Log entry time 00:09:07 on November 03, 2008

Entry number 246338

Time Line & Link to Reports:

• 10:29 : Pumping Laser OFF
• 10:31 : Optics Position, Vertical Holding Field, Long. RF NMR (by Yi Zhang) . Pol=~60%
• 10:39 : Pick up Position, Vertical Holding Field, Long. RF NMR (by Yi Zhang). The NMR signal on pumping chamber is confirmed not changing much.
• 10:49 : Pick up Position, Long Holding Field, Vert. RF NMR (by Yi Zhang). It shows that Upstream = 240mV; Downstream = 250 mV. => Pol = 0.12%/mV * (UpStream NMR+ DownStream NMR)
• Unknown Time : rotate holding field to Longitudinal+
• 12:02 : Pick up Position, Long Holding Field, Vert. RF NMR (by Yi Zhang) : Pol=53%.
• 12:04 : Requested 5uA on 3He target with 4x4 raster for production running.
• 13:44 : An NMR measurement without lowering to pickup coil position (by Yi Zhang) :  No reliable NMR signal is collected, because No pickup coil is adjusted to work with beam line level long. polarization. 
• 14:50 :  An NMR measurement without lowering to pickup coil position (by Yi Zhang) :  No reliable NMR signal is collected.
• 15:24 & 15:30 : two NMR measurement without lowering to pickup coil position (by Yi Zhang) :  No reliable NMR signal is collected.
• 15:58 : Pick up Position, Long Holding Field, Vert. RF NMR (by  Jin Huang and Yi Zhang) : Pol = 38%
• 18:08 : Pick up Position, Long Holding Field, Vert. RF NMR (by Jin Huang) : Pol = 31%
• 19:00 : Pick up Position, Long Holding Field, Vert. RF NMR (by Jin Huang) : Pol = 28%
• 19:10 : Start Moller Measurement. 
• 19:20 : Couple test, Vertical Laser On
• 19:20 : Rotate to Vertical +.
• 19:26 : Empty Location, Vertical Holding Field, Long RF NMR (by Jin Huang) : Pol = 24%
• 19:35 : EPR Measuremant get Pol = 25.9%
• 19:37 : Empty Location, Vertical Holding Field, Long RF NMR (by Jin Huang) : Pol = 25%
• 19:40 : Keep Vertical Pumping
• 20:00 : Change Vertical Fiber -> Duo Laser; Trans Fiber -> Fap Laser
• 21:20 : Start Transverse Pumping
• 21:30 : We get EPR FM sweep signal with only 30mV on diode. Among 3 major resonance, Potassium resonance is @ 16.0MHz
• 21:42 : Get EPR Pol = 28.2%.  => Pol. = 2.16 * Vertical NMR
• 21:59 : NMR Pol = 30%
• 22:21 : NMR Pol = 33.5%
• 23:02 : NMR Pol = 38 %
• 23:04 : Laser Off; Rotate -> Longitudinal+ holding Field; Target -> Pickup Location
• 23:10 -> 23:13 : 3 Junk NMR by Jin Huang: Using Longi RF & No Field Sweep (sweep start stop field setting is same); No Field Sweep; Wrong Software Backgroud Substraction
• 23:14 : Pick up Position, Long Holding Field, Vert. RF NMR (by Jin Huang) : Pol = 31% (drop a lot!)
• 23:22 : Target -> BeO Position
• 23:15 : Since polarization is low and  Xin needs additional H2 run. Target is restored to transverse position to keep pumping.
• 23:31 : NMR Beo Position : Long RF : Trans Holding Field: Vert pick up coil (by Jin Huang): Pol = 35% (presuming cali constant is same for BeO & Empty Target)
• 23:58 : NMR Beo Position : Long RF : Trans Holding Field: Vert pick up coil (by Jin Huang): Pol = 38% (presuming cali constant is same for BeO & Empty Target)
• 24:00 : Keep Trans Pumping

Calib Constants:

Vertical Holding Field, Long. RF, Pumping Chamber Trans Coil:

Reference to HaLog 246037 11/01/08 22:48  Yi Qiang       EPR calibration of vertical pumping

Pol = 1.5%/mV * Trans NMR

Long Holding Field, Vert RF, Target Chamber Trans pickup Coil:

Reference to HaLog 246271 11/02/08 16:29  jinhuang       Before taking beam@4PM, he3 Pol. is estimated to be 38%.

Pol = 0.12%/mV * (UpStream NMR+ 
DownStream NMR)

Trans Holding Field, Long RF, Target Chamber Vert pickup Coil:

Reference to HaLog http://www.jlab.org/~adaq/halog/html/0811_archive/081102221509.html .

Pol = 2.16%/mV * Vert NMR 

A copy of this log entry has been emailed to: jpchen@jlab.org , yqiang@jlab.org, brads@jlab.org , averett@jlab.org, jinhuang@jlab.org