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Status of Cathode System in FZR. Photocathode preparation and test of the cathode cooling system. Rong Xiang FZ Rossendorf, Dresden. Cathode System in SRF Project. Preparation chamber Transport chamber Cathode cooling system. What we need ?. Preparation Chamber. Design Manufacture

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Status of cathode system in fzr

Status of Cathode System in FZR

Photocathode preparation and

test of the cathode cooling system

Rong Xiang

FZ Rossendorf, Dresden


Cathode system in srf project
Cathode System in SRF Project

  • Preparation chamber

  • Transport chamber

  • Cathode cooling system



Preparation chamber
Preparation Chamber

  • Design

  • Manufacture

  • First test, optimize

  • Clean room building

  • Clean

  • Assemble

  • Experiment

  • Production (July 2006)


Preparation system
Preparation System

shutter

rate monitors

evaporators

laser light

ports

cathode

  • Ultra high vacuum (10-11 ~ 10-9 mbar )

  • Cathode holding

    Halogen-light heating

    Ion-beam cleaning

  • Co-evaporation of Te and Cs

  • Measurment of quantum efficiency

    QE during deposition

    Life time

    Distribution scan


pressure spring

bayonet fixing

cone for

positioning &

thermal contact

Ø10 mm

Cs2Te

Cathode plug

Cathode plugs are made of Cu or Mo

Manual Polishing result: average roughness: 17.2 nm

(analyzed by Dektak8 profiler)


Control system

Control program

“SRFgun”

Quartz thickness monitor STM-1


Co evaporation
Co-evaporation

NCs

2

=

R=

NTe

1

Calibration

Te, Cs separate

Preparation

Stoichiometric



Our homepage

http://www.fz-rossendorf.de/projects/CARE/


2 transport chamber
2. Transport Chamber

cathode transfer root

linear & rotation

places for

6 cathodes

transportation

chamber

exchange

chamber

  • Design

  • Manufacture

  • First test, optimize

  • Clean

  • Assemble


Minimum particle generation during exchange

Six cathodes can be stored and transferred

Accurate adjustment


3 cathode cooling system
3. Cathode cooling system

cathode cooler

LN2 reservoir

cathode

  • Design

  • Manufacture

  • First test, optimize

  • Final assemble


Test of the cathode cooling system
Test of the cathode cooling system

Measured temperatures via power input

30 W power input to the photo cathode burdens the cavity with only 31 mW.

(F. Staufenbiel, et al., SRF2005)


Next work
Next work

  • Finish construction of preparation chamber

    (clean, assemble, vacuum…)

  • Solidify preparation technology

    (control, measure, calibrate…)

  • Finish the test of transport chamber

    (optimize, clean, vacuum, portable…)



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