Hi,
If by BLAST HV supplies you mean Lecroy HV mainframes, I do believe I need to be
involved in this as well. Incorporating new elements in the epics control is not
exactly straightforward.
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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