At 11:18 AM 6/3/03 -0400, Adam DeGrush wrote:
>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.
ok w/ me
vadc=voltage readback
iadc = current readback
idac = current limit
vdac = voltage setpoint
>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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