RF Cavity update Feb RF Cavity update Feb 20052005

G. GoslingG. Gosling

Mech Eng.Mech Eng.

Sources of latest informationSources of latest information

MICE web-site (schematic drawings)MICE web-site (schematic drawings) Derum Li presentation to LBNL colab. mtgDerum Li presentation to LBNL colab. mtg Discussions with:Discussions with:

Steve Virostek (LBNL)Steve Virostek (LBNL) Bob Rimmer (jLab)Bob Rimmer (jLab)

Coupling coils now defined. Greater spacing between cavities

Main change - All cavities now identical and independent of each other.

Current statusCurrent status

Port formation problem is now believed Port formation problem is now believed solved.solved.

First 2 Be windows failed, third due soon First 2 Be windows failed, third due soon and there is confidence from the supplier.and there is confidence from the supplier.

Cavity requires further electro-polishing Cavity requires further electro-polishing before testing.before testing.

Cavity will be tested at Fermilab under Cavity will be tested at Fermilab under non-representative external conditions.non-representative external conditions.

Fermilab test conditionsFermilab test conditions

Cavity will be rigidly bolted through both Cavity will be rigidly bolted through both stiffener rings to free-standing fixture.stiffener rings to free-standing fixture.

Cavity will work in atmospheric conditions Cavity will work in atmospheric conditions under internal vacuum.under internal vacuum.

Tuning will be conducted manually and Tuning will be conducted manually and must compensate for operating pressure must compensate for operating pressure difference.difference.

Next phaseNext phase

Prototype cavity off for finishing and test at Prototype cavity off for finishing and test at Fermilab – April 2005.Fermilab – April 2005.

No current design work ongoing at LBNL.No current design work ongoing at LBNL.

IC to get involved and assist with design of IC to get involved and assist with design of tuning and cavity support equipment.tuning and cavity support equipment.

RF 2D view

ProblemsProblems

Define Cavity and Shell parameters for:Define Cavity and Shell parameters for: Manufacturing tolerancesManufacturing tolerances Physical propertiesPhysical properties Behaviour under running conditionsBehaviour under running conditions Operators’ requirementsOperators’ requirements Design constraintsDesign constraints

• Materials, processes, available space.Materials, processes, available space.