Fig. 2				
	Frequency (GHz)	Frequency (GHz)	Frequency (GHz)	
Phase shift  (Phi/Pi)	Dispersion curve DCW	Beam line 12.70kV	Beam line 13.05kV	
1.027778	63.11153	31.2358562	31.66334626	
2.0833335	64.105435	63.31591611	64.18244988	
2.138889	65.357775	65.00433872	65.89398003	
2.1944445	66.813865	66.69276132	67.60551018	
2.25	68.41358	68.38118393	69.31704033	
2.3055555	70.095025	70.06960653	71.02857048	
2.361111	71.797815	71.75802914	72.74010063	
2.4166665	73.46585	73.44645175	74.45163078	
2.472222	75.049395	75.13487435	76.16316092	
2.527778	76.50636	76.82331215	77.87470648	
2.5833335	77.802905	78.51173476	79.58623662	
2.638889	78.913225	80.20015737	81.29776677	
2.6944445	79.818675	81.88857997	83.00929692	
2.75	80.506595	83.57700258	84.72082707	
2.8055555	80.506595	85.26542519	86.43235722	
2.861111	80.506595	86.95384779	88.14388737	
2.9166665	80.506595	88.6422704	89.85541751	
2.972222	80.506595	90.330693	91.56694766