Hi,
Talking to Townsend it was decided to first test one high voltage for an Ion
polarimeter using the hv mainframe to see if it will work. He also suggested
using an already allocated channel to do this and it was agreed to use the neutron
detector. I will pick one randomly unless somebody directs me otherwise.
Cheers,
Adam
Townsend Zwart wrote:
> Dear All,
> I propose we take the following actions w.r.t ION polarimeter devices.
>
> 1) EMCO supplies should be replaced. These devices are inadequate.
> Let's try BLAST HV supplies which have current readback. Dan is
> coordinating this with Karen and Tancredi. We do not need to move them
> all at once.
> 2) Results of tests show that the sagging voltage on upstream spherical
> deflector is e-beam related and independent of supply voltage and target
> thickness. We should see how this device performs with a better supply.
> Either EG&G or BLAST HV.
> 3) Failing ION polarimeter should be run at 30 kV for now. There is no
> need to run this device at 60 kV until we want scattering asymmetry. We
> are constructing a printed circuit board floating ammeter which will
> have better HV standoff properties. This should be available in ~two
> weeks.
>
> TZ
>
> Yuan Xiao wrote:
> >
> > For 5/30 C shift:
> >
> > Around 9:30pm, got the beam to measure the RF effect of the
> > storage ring to the lenses. No obvious effect was observed
> > -- the signal picked up by the HV cable from lenses was only
> > 1dbm bigger than the noise picked up at D tunnel.
> >
> > Current from each lenses was measured again. Several nA
> > was got from the split lenses before and after Wien Filter (WF)
> > and from WF plates. Tens of uA was seen from the outer shell
> > of the spherical deflector (SD) and the plit lens before it; no
> > current was seen from the inner shell of SD.
> >
> > Chi, Yuan, Genya,
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