|
FEL Beam Dynamics Group - Main Linac - Cryo Module
|
Cross section of a type 3 module.
(Click on the image to see a cut-away view of th cryomodule)
|
| |
|---|
|
Comparison of cryomodule type 3 module parameters (after 2 thermal cycles) with the XFEL specifications
|
Module Performance
|
Module 4
|
Module 5
|
XFEL specs.
|
|
RF gradient
|
|
|
reached
|
|
Design
|
>24 MV⁄m
|
>25 MV⁄m
|
23.6 MV&frasl/m
|
|
Measured
|
average >26 MV/m
|
average >29 MV/m
|
|
Dynamic cryo loss 2K
25 MV⁄m 5 Hz 500⁄800 µs
|
|
|
reached
|
|
Design
|
3.0 W (Q0=1E10)
|
3.0 W (Q0=1E10)
|
3.0 W (Q0=1E10)
|
|
Measured
|
2.3 W Q0=1.3E10
|
2.0 W (Q0=1.7E10)
|
|
Static cryo losses
2K ⁄ 4K ⁄ 40-80K
|
|
|
reached
|
|
Design
|
4.2 ⁄ 21.0 ⁄ 112 W
|
4.2 ⁄ 21.0 ⁄ 112 W
|
4.2 ⁄ 21.0 ⁄ 112 W
|
|
Estimated
|
2.8 ⁄ 13.9 ⁄ 77 W
|
2.8 ⁄ 13.9 ⁄ 77 W
|
|
|
Measured
|
<3.5 ⁄ 13.5 ⁄ 74 W
|
<3.5 ⁄ 13.5 ⁄ 74 W
|
|
|
Number of Leaks
|
0
|
0
|
reached
|
|
He → insulation
|
0
|
0
|
|
|
He → beam pipe
|
0
|
0
|
|
|
Insulation → coupler
|
0
|
0
|
|
|
Insulation → beam pipe
|
0
|
0
|
|
|
Coupler → beam pipe
|
0
|
0
|
|
|
Alignment x⁄y inside
|
|
|
reached
|
|
Cavities design x⁄y
|
+0.5⁄-0.5 mm (peak)
|
+0.5⁄-0.5 mm (peak)
|
+-0.5 mm (rms)
|
|
measured x
|
+0.32⁄-0.19 mm
|
+0.35⁄-0.32 mm
|
|
|
measured y
|
+0.10⁄-0.35 mm
|
+0.2⁄-0.1 mm
|
|
|
Magnet⁄BPM design
|
+0.3⁄-0.3 mm (peak)
|
+0.3⁄-0.3 mm (peak)
|
+-0.3 mm (rms)
|
|
measured x
|
+0.10⁄-0.05 mm
|
+0.15⁄-0.05 mm
|
|
|
measured y
|
+0.35⁄-0.05 mm
|
+0.20⁄-0.05 mm
|
|
|
Alignment z inside
|
|
|
reached
|
|
Coupler antenna/b> design z
|
within 2 mm
|
within 2 mm
|
within 2 mm
|
|
Measured z x-ray
|
within <2 mm
|
within <2 mm
|
|
|
|
|
|