peter hülsmann, gsi rf-group, email: [email protected], tel: +49 6159 71 2066 task sis18-1: h=2...

Peter Hülsmann, GSI RF-Group, Email: [email protected], Tel: +49 6159 71 2066

Task SIS18-1:h=2 Cavity

P. Hülsmann

GSI, Gesellschaft für Schwerionenforschung mbHPlanckstraße 1D-64291 Darmstadt

EU-FP6 Kick Off Meeting, December 1 - 2, 2005


Task SIS18-1: h=2 Cavity

1) Present Status

2) Technical Description

3) Organizational Issues

4) Time Schedule

5) General Strategy for Construction

6) Cost Overview

Content


Objectives

Development of new RF accelerating cavity based on the novel magnetic alloy materials (MA-materials) for operation at harmonic number h=2 (f = 0.43 to 2.5 MHZ) to provide the necessary accelerating voltage for SIS18 injector operation with high intensity heavy ion beams in a fast operation mode with four cycles per second.

Additional InformationPresently the SIS18 rf – system operates at the fourth harmonic.At the end of the SIS18 upgrade program the harmonic number two system will replace one of the old cavities in order to enable a double harmonic rf operation with the remaining cavity.It is important to point out that the existing SIS18 rf system does not provide enough bucket area in order to accelerate intense bunches in the 4 Hz SIS12 mode.

1) Present StatusTask SIS18-1: h=2 Cavity


Boundary conditions for the h=2 rf system

• Due to the many insertions which were additionally implemented into the synchrotron ring SIS12/18 in the meantime, the available length in SIS12/18 for one cavity is very short.

• Thus, the priority objective is a cavity which has a length of not more than 2 m.

• The gap voltage requirement with space charge effects but without beam loading is 40 kV in the frequency region of 0,429-1,168 MHz.

• In order to leave a safety margin we demand a total voltage of not less than 50 kV.

• If an ordinary ferrite is used for the cavity the total length would be more than 5 m.

1) Present StatusTask SIS18-1: h=2 Cavity


2) Technical Description: The rf-systemTechnical Subsystems

CavityConsists of two independent units with two gaps eachThe two gaps of a unit are connected in parallelCavity is filled with a total of 24 magnetic alloy ring coresThe ring cores are directly cooled by silicon oil

Power amplifierOne push pull amplifier for each unitOne amplifier consists of two 300 kW RS 2042 SK tubesOne amplifier delivers 180 kW rf output power

Supply unitLow Level RF and PLC


Ceramic Gap

Beam Pipe

MA Ring Cores

Coupling Capacitor

RF Choke Anode voltage UA

Tetrode RS 2042 SK (300 kW)

Screen grid

Control grid

Anode

Kathode

Supply Unit IScreen Grid Voltage Supply UG2 = 1500 V

Control Grid Voltage Supply UG1 = - 210 V

Anode Voltage SupplyUA = 8,3 kV, IA = 37 A,PDC = 307 kW

Kathode Heating, 2 x 100 A, 6 kW

Coupling Capacitor

RF Choke

Anode voltage UA

Driver Amplifier2 kW

Supply Unit IIScreen Grid Voltage Supply UG2 = 1500 V

Control Grid Voltage Supply UG1 = - 210 V

Anode Voltage SupplyUA = 8,3 kV, IA = 37 A,PDC = 307 kW

Kathode Heating, 2 x 100 A, 6 kW

Low Level Control

PLC

Controls Cooling Fluid (not water)

Temperature, Fluid Flow, Pressure

Controls Cooling Fluid (not water)

Temperature, Fluid Flow, Pressure

Low Level Control

PLC

Driver Amplifier2 kW


Table 1: Geometical data to the Finemet FT-3M ring cores

Inner radius ri 150 mm

Outer radius ra 475 mm

Ring core hight h 35 mm

Surface for cooling 2 x 0,64 m2

Table 2: The cavity

Number of ceramic gaps 4

Number of ring cores per halfcavity

3

Number of ring cores in both units

24

Overall surface of all ring cores31 m2

2) Technical Description: CavityTask SIS18-1: h=2 Cavity


Personnel

Task LeaderGSI: P. Hülsmann

Posts at GSI 1 new Scientist (advertisement for post not yet completed) 1 new Engineer (contract start 01.02.2006)

108 person-months

1.12 M€ investments

3) Organisational Issues



4) Schedule (Description of Work)

Personnel not yet available




5) General strategy for construction

Subsystems to be purchased by industrial companies or institutesMain focus on system integration

Risks

Organisational risksStaffing (delayed hiring, adjustment to new job)Tough time schedule due to FAIR-overall planning

Technical risksExtraordinary technical requirementsReliability


6) Cost Overview


2005 2006 2007 2008 2009 TotalScientists 1 1 1 1 4

0 € 84.000 € 84.000 € 84.000 € 84.000 € 336.000 €Engineers 1 1 1 1 4

0 € 84.000 € 84.000 € 84.000 € 84.000 € 336.000 €Technicians 0,50 € 0,50 € 1

42.000 € 42.000 € 84.000 €Personnel 0 € 168.000 € 168.000 € 210.000 € 210.000 € 756.000 €Investment 260.000 € 820.000 € 40.000 € 1.120.000 €

GSI

No collaboration partner for this task (CERN has withdrawn its participation because of manpower problems)



SIS18 h=2 MA-Broadband-RF-System for AccelerationSIS18 h=2 MA-Broadband-RF-System for Acceleration(Duty Cycle 50% => directly cooled, 13 kW / Ring Core)(Duty Cycle 50% => directly cooled, 13 kW / Ring Core)

Parameters Continous operation

Frequency (MHz) 0,4 – 2,5

Gap-Voltage (kV) 40

Duty Cycle 50%

Total Power (kW) 600

SIS18 h=2 acceleration: cost estimatons per unit

System Additional InformationCost

s [k€]

Cavity(broadband => no bias current)

Number of MA-Cores=24,four Gaps, two are connected in parallel, no bias windings

280

Power AmplifierPRFout=360 kW, PAD=900 kW

Tube=4 x RS 2042 SK (300 kW)

300

Supply UnitUA=8,3 kV, IAmax=65 A

UG2=1,5 kV, PTh=6 kW360

Driver Amplifier 2 x 2 kW (0,4-2,5 MHz) 60LLRF 90Cabling, Accessories

30

Sum 1120

EU FP6 construction ->non-commercial, reduced price

peter hülsmann, gsi rf-group, email: [email protected], tel: +49 6159 71 2066 task sis18-1: h=2...

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