5-19-08

Tests of the beam position monitor and the FC using the HRRL

Position tests

Below we see the first signals from the BPM

changed current

Current	scope picture
80(early)
40
80(later)

changed position

position change	asym	scope picture
5 turns clockwise of platform	0.879 [math]\displaystyle{ \pm }[/math] 0.0623
4 turn clockwise	0.659 [math]\displaystyle{ \pm }[/math] 0.0149
3 turn clockwise	0.646 [math]\displaystyle{ \pm }[/math] 0.169
2 turn clockwise	1 [math]\displaystyle{ \pm }[/math] 0.003
4 turns counter clockwise	0 [math]\displaystyle{ \pm }[/math] 0.003
0 turns from center	3/8 [math]\displaystyle{ \pm }[/math] 0.003
8 turns clockwise	15/17 [math]\displaystyle{ \pm }[/math] 0.003
6 turns clockwise	.778 [math]\displaystyle{ \pm }[/math] 0.003
2 turns counter clockwise	0.231 [math]\displaystyle{ \pm }[/math] 0.112

File:BPM 80mA 25ns 10Hz Position1.png

[1]

counter clockwise 1 turn

FC performance

Current (mA)	scope picture
2
5
20
40
80

Rise of table per rotation

Measurement

Turns	h (cm)
Original position	10.02
10 turns ccw (down)	9.03
10 turns ccw (down)	7.00
10 turns cw (up)	9.04
10 turns cw (up)	10.04
10 turns ccw (down)	9.05
10 turns ccw (down)	7.00
10 turns ccw (down)	4.94

Where "h" is height of table, and "cw" and "ccw" stand for clockwise and counter clockwise respectively.

The average change of height by a turn is 0.19 cm, with standard deviation σ =0.1cm