Action items as of 2002-10-07

Here are a list of action items that I generated in the meeting. Let me know if they are accurate.

    The Radia model underestimates the measured effect of field integral by a factor of 5 as compared with the measured feedforward tables. Also the Radia model does not predict any shift dependent skew quadrupole field wheras there is a large one in the measurent. Also Pascal Elleaume feels that there should be a shift dependent skew quadrupole in the Radia simulations.

  1. Action Item 1. Check the Radia model with Joel Chavanne Andy Wolski will send the Radia notebook to Joel Chavanne of ESRF who will look it over.

    2. Pascal Elleaume has indicated that ESRF has modified the design of some of their devices to get rid of either the integrated field or the shift dependent skew quadruple of both.

  2. Action Item 2. Confirm what ESRF has and has not done in this regard. Steve Marks will contact Joel Chavanne and ask him specifically the details of what they have done.

    3. There may be some steel or iron near the beam pipe whose magnetation may be changing when the device is shifting polarization.

  3. Action Item 3. Make a careful look at the EPUs On October 8 Ross, Steve and Jin-young will make a careful look at the EPU during the shutdown day to see if they see anything suspicious. Perhaps even do some Hall probe measurements.

    4. Collect the magnet measurement data on the EPUs

  4. Action Item 4. Steve Marks and Steve Lidia will analyze the data of Bx versus x for the two EPUs versus shift parameter and see how similar the devices our. This data will be compared with Christoph's feed forward tables to see if they agree.

    5. Determination of the skew quadrupole component coming from the EPU.

  5. Action Item 5. Christoph and others will make another measurement of the change in beamsize versus shift parameter and in the same shift measure the response matrix. The response matrix would be analyzed to compute the coupling distribution coming from the rest of the ring and then Christoph would try to back out the skew terms in the EPU directly.

    6. Improvement of the documentation

  6. Action Item 6. We will collect the plots each week and Christoph will put them on the web site.

Next meeting will be in two weeks on Monday October 21.

Thanks, Dave

CSteier@lbl.gov