Date: Wed, 29 Mar 2006 12:13:58 -0800 (PST)
From: Achim W. Weidemann 
To: Cherrill Spencer
    Paul Bellomo 
Cc: Z. Wolf, Briant K. Lam 
Subject: OECM Power Supply Switching Effect

Hi,
  Briant and I completed the measurements requested by Cherrill Spencer
(in
http://www-group.slac.stanford.edu/met/MagMeas/MAGDATA/ILC/OECM-PS/Charge.txt
of March 18, 2006)
on the switching behaviour of the OECM Power Supply on a magnet,
using the set up with a dipole magnet in the Power Conversion Lab.

In short, during switching,
- the Voltage drops by ~6.25 V from ~ 12V
- the current drops by  7.7A (from 120 A)
- the field in center drops by 160 Gauss (from 2.5 kG)
- the Voltage recovers, with ~350mV overshoot, within 40ms
- current and field recover much slower, >400ms.

A more detailed report is at

http://www-group.slac.stanford.edu/met/MagMeas/MAGDATA/ILC/OECM-PS/oecm-ps.pdf
(Adobe pdf, 5 p.)
http://www-group.slac.stanford.edu/met/MagMeas/MAGDATA/ILC/OECM-PS/oecm-ps.odt
(OpenOffice 2.0)
http://www-group.slac.stanford.edu/met/MagMeas/MAGDATA/ILC/OECM-PS/oecm-ps.sxw
(OpenOffice 1.1)
http://www-group.slac.stanford.edu/met/MagMeas/MAGDATA/ILC/OECM-PS/oecm-ps.doc
(MS Word, made from OpenOffice)
http://www-group.slac.stanford.edu/met/MagMeas/MAGDATA/ILC/OECM-PS/oecm-ps.html
(Web Page).
This directory,
http://www-group.slac.stanford.edu/met/MagMeas/MAGDATA/ILC/OECM-PS/
also contains the charge (Charge.txt), and the original figures used in
the report.

Please let us know if any additional information or measurements are
required.

                   Sincerely yours,
                    Achim & Briant