We should discuss this tomorrow morning before we open the target
chamber.
Manouchehr
Genya wrote:
>
> We were running ion polarimeter this night.
> We failed to detect the atoms in the ABS-filled cell, but the
> results are not very conclusive as yet (see below).
> As we switched from unpol. system to ABS, the Ion Polarimeter
> signal increased by about factor of 10 - clear confirmation that
> unpol. gas misses the cell. Unfortunately, it reduces greatly the
> credibility of H2/D2 calibration, since it was mostly sampled from
> outside of the cell, which may affect energy distributions, trajectories
> and so on.
> Secondly, the measured mass spectra depend on the current in the ring.
> At least for the mesurements with unpol. system.
> Thirdly, something is unstable. We need normal Epics control of HV
> channels, so we can put them on the graphs.
>
> In any case, we need more time to fine-tune the polarimeter, and we
> need another run, with unpol. gas that is really inside the cell.
> So, my suggestion is to open the vacuum tomorrow and fix this tube,
> and repeate the measurements. If we can get some normal control of HV
> channels by then, it will be greatly appreciated.
> Genya
--____________________________________________________________________ Manouchehr Farkhondeh manouch@mit.edu Principal Research Scientist Division Head of Physics, Accelerator MIT, Bates Linear Accelerator Center tel (617)253-9298 Middleton, MA 01949 fax (617) 253-9599 ____________________________________________________________________
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