[b1_ana] LiD

[Donald G. Crabb]

Hi All,
 Managed to get connected from my hotel in Athens and want too comment on using LiD as the target material from our experience at SLAC.

  1. LiD is a cubic symmetric crystal. therefore there is no distortion of the energy levels. There is equal spacing between the m=0 and m=+/-1 energy levels so only one peak as Donal pointed out. Therefore TEs have to be done. And forget for the future any tensor polarization measurements.

 2. The TEs will take a very long time - many hours at standard temps <2K and it is difficult keeping the croyostat stable over this period of time. Perehaps this could be ameliorated by finding a way to work stably at around 4K.

 3. One of the plusses is that the NMR signal is a very narrow line so fairly easy to detect.

  4. LiD takes a long time to polarize up to ~ 30%. However it has excellent rad. resistance, in fact increases in the early part of putting beam on it We have only annealed successfully twice at about 180 K.

 5. Both Li and D polarize to about the same value (Magnetic moments only ~2% different)

  6 However all samples of 6LiD contain about 4.5 % 7Li which has to be measured as it polarizes to ~ 80 %. There may also be protons due to water absorption.

   Li6D is an excellent deuteron target for many experiments but not for this one.

 I'll continue reading the next 75 messages and see if there is anything else to comment on.

    Best,

        Don
    






On Thu, 2 May 2013 16:38:00 -0400
 Donal Day <dbd at cms.mail.virginia.edu> wrote:
>Not sure what is meant by the ratio method with LiD. Is has a single line.
>
>Donal
>
>
>On May 2, 2013, at 2:37 PM, O. A. Rondon wrote:
>
>> Not a problem if the ratio method is used.
>
>Donal Day
>dbd at virginia.edu
>434 924 6566
>
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>b1_ana mailing list
>b1_ana at jlab.org
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-------------------------------------------------------------
D. G. Crabb
Research Professor of Physics
University of Virginia
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Phone: 434-924-6790
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