Present:
H. Fenker, H. Areti, L. Tang, R. Lauze, A. Cuffe, V. Lebedev, J. C. Denard, G. Krafft, C. Yan, H. Juengst, J. Liu, L. Gan. L.Yuan
L. Tang gave the beam parameters. These are:
Beam Energy:
Beam Current:
The other halls drive the changes in energy. HNSS would rather have 1.7 GeV and stay there for the duration.
Beam Position stability < 300 microns.
V. Lebedev:
Fast feedback system requires beam current of at least 1 microAmp. For energy stability, HNSS should consider using running Hall A Fast feedback during the experiment. This will stabilize energy. The major concern here is the dependency on Hall A's desires and schedule. (Looking at the not-so-firm schedule, there are 4 days when Hall A is NOT running during HNSS - 4/2/2000 to 4/5/2000).
Before negotiating with Hall A, it is well to test the energy stability in Hall C using both Hall A Fast feedback and Hall C fast feedback separately.
ACTION:
Generate test plans to study energy stability in Hall C using Hall A Fast feedback (i.e. energy feedback is in Hall A system) and using Hall C fast feedback (i.e. energy feedback is in Hall C system). During Hall C feedback tests, vary the current if possible to study how low in current can one go before the fast feedback system becomes unreliable. (L. Gan, with help from A. Cuffe and H. Areti).
There is an understanding with the Zeidman experiment that HNSS people will study beam energy stability during 10/29/99 - 12/7/99. (Zeidman running period). This is the period when the feasibility of leaving the OTR monitor continuously in the beam will also be tested.
V. Lebedev said that during HNSS the correctors in the arc string will be disconnected. If beam needs to be steered, it will be done by the magnets down stream of the string (in the experimental hall) or at the launch. R. Lauze recommended that we come up with procedures which should come out of the various test plans. L. Tang will be in charge of starting the draft procedures. L. Gan will be in charge of seeing that some one will be in the MCC during the tests and during critical periods of experimental runs. This is because establishing a good communications protocol is essential when the requirements are stringent.
During the Zeidman experiment, with the OTR and Fast feedback systems in place, HNSS people will acquire critical data.
H. Areti will get the signals names and Hall C DAQ person should be able to integrate these signals into the experiments data stream. The fast feed back error signal and IPM3C12 signal should also go into alarms. OTR centroid should also go into alarms. There is a little bit of work to be done to implement this.
V. Lebedev suggested that it may be wise to monitor the ground loop as well.
The next meeting will be in two weeks (thursday, 9/16/99) at 10:00 AM in the Test Lab conference room.