CEA-Saclay Activities - TESLA Technology Collaboration - Desy

HOM (coll. with DESY)
Beam Measurements on ACC1
• Beam based alignment resolution of 50 µm w.r.t.
cavity HOM axes
Cav.: 1, Passb. 1, mode #6, Pol. 1
Cav.: 1, Passb. 1, mode #6, Pol. 2
y
HOM Ampl. [a.u.]
20
15
10
5
0
x = −1.75 mm
1→2
a
←y = 0.766 mm
−2 −1 0 1 2 3
25
20
15
10
5
0
y = 0.797 mm
2 →3
b
←x = −4.83 mm
−6 −5 −4 −3 −2
polarization
directions
2
3
5
4
1
x
HOM Ampl. [a.u.]
4
3
2
1
0
2
x = −4.85 mm
y = 0.452 mm
1.5
3 →4 4 →5
0.5
c
←y = 0.441 mm
d
←x = −4.85 mm
0
0.4 0.6 0.8 1
−5 −4.9 −4.8 −4.7
y [mm]
x [mm]
1
SACM/LESAR / September 2004 - Orsay
07/09/2004 15