Log entry time 13:17:38 on August16,2005

Entry number 152170

Here is a table summarizing the data from the helicity magnet tests done 
yesterday.  The table values are the slopes of the position differences for 
each Hall A bpm versus the setpoint on the helicity magnets, so the units are 
um/setpoint unit.

	0L01V	0L02H	0L03V	0L03H

4ax	0.037	-0.057	0.042	-0.067

4ay	-0.004	0.004	-0.004	0.004

4bx	-0.002	0.0004	-0.0007	0.001

4by	-0.004	0.014	-0.012	0.007


BPM 4bx is relatively insensitive to all of the magnets.  This is probably due 
to the small jitter/beta function at 4bx.  4ax has a large response to all the 
magnets, but changes sign between horizontal and vertical magnets.  4ay has the 
same small response to all magnets with opposite sign between vertical and 
horizontal magnets.  I believe that the magnets are relatively orthogonal in 
the injector, but there must be some rotation in the hall because our x 
position differences respond to H and V magnets as observed in 4ax.  The y 
position differences also respond to both H and V magnets as observed by 4by.

We also took some oversampling runs to look at the behavior of the helicity 
magnets with time.  Figure 1 shows the x and y position differences at bpm 0L06 
vs timeslot when all the magnets are on, but setpoints are at 0.  Figure 2 
shows the response of x response of bpm0L06 for the H magnets and the y 
response for the V magnets.  There is a big difference between the first 
timeslot and the following timeslots for 0L03H, but all the distributions seem 
to look fairly similar to the time dependence when the helicity magnets are not 
being pulsed.