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High Pressure Rinsing

High pressure rinsing (HPR) is nowadays routinely used in the process of superconducting RF cavities assembly to remove residuals from the resonator wall. Despite the success of HPR in improving cavity performances, mainly reducing field emission, few studies have been performed to investigate the properties of the HPR jet at its impact on the superconducting cavities wall. These are important issues for the future ILC (International Linear Collider) in order to improve performances and reliability of the HPR process for the cavities mass production.

The water jet is characterized by measuring its force and its spot size at different distances from the HPR center line. Different nozzles have been used and the result so far obtained are listed below.

Normal Incidence - Pressure 100 atm

Nozzle Type Force
[kg]
Spot size [mm]
@ 35mm 
Spot Size [mm]
@ 69mm 
Spot Size [mm]
@ 103mm 
Water Flow
[l/min] 

JL-0.3-L

0.09

0.30

0.57

0.87

0.43

JL-0.6-L

0.38

0.74

1.32

2.08

1.62

JL-1.0-L

1.35

 0.82

1.43

 2.16

5.14

JL-Fan-L 

0.98

 1.17

 

 

4.82

 JL-0.4D-L

0.17

0.25

0.39

0.46

0.74

L-0.55-L

0.35 

0.35

0.6

0.75

 

 

Nozzle Type

Sending Lab - Nozzle Diameter (eventually Lab) - measuring Lab

JL = JLab D = DESY L = LASA

 

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