Transcript Faraday Cups Specifications LEBT

Linac4 Instrumentation Day
Faraday Cups
 In order to measure the beam intensity three
Faraday Cups will be installed in different
places
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LEBT
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Spectrometer
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Low energy
Moving Diagnostics Bench for the three DTL
tanks
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09-05-2007
Low energy
High energy
C. Bal
AB/BI/ML
1
Faraday Cups
Scheme of Linac4
09-05-2007
C. Bal
AB/BI/ML
2
Faraday Cups
Specifications LEBT
 Low Energy: 95 keV
 Commissioning &
Operation
 Retractable
 Acceptance FC
ø80 mm
 Acceptance Tank
ø100 mm
09-05-2007
Parameter
Ion Species
Pulse Length
Rep. Rate
Beam Power
Pressure
Source Current
Bias Voltage
C. Bal
AB/BI/ML
Quantity
H400 µs
2 Hz
6W
10-5 mbar
80 mA
3 kV
3
Faraday Cups
Mechanical Design LEBT
09-05-2007
C. Bal
AB/BI/ML
4
Faraday Cups
Mechanical Design LEBT
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Bias Ring, Collector and Housing made of St. Steel
Vespel Insulators for electrical isolation
Conical Collector
Use of metal seals only
Flanged High Voltage Feedthrough
Flanged Signal Feedthrough
Linear Pneumatic Drive (travel 102mm)
Flange DN150CF (øouter 202mm)
Parts slide into Housing and will be closed by
dismountable Face and Back Plate
09-05-2007
C. Bal
AB/BI/ML
5
Faraday Cups
Specifications Spectrometer
 Low Energy: 95 keV
 Temporary installation
 Commissioning only
 Fixed
 Similar design as for LEBT
09-05-2007
C. Bal
AB/BI/ML
6
Faraday Cups
Specifications Moving Bench DTL
 High Energy: 40 MeV
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Parameter
Commissioning only
Ion Species
Retractable
Pulse Length
Requires Cooling
Rep. Rate
Requires Energy
Absorber (levels to be Beam Power
Pressure
defined)
Linac Current
Design under
development
Bias Voltage
09-05-2007
C. Bal
AB/BI/ML
Quantity
H400 µs
2 Hz
5.1 kW
10-7 mbar
40 mA
3 kV
7
Faraday Cups
Electronics
 Local read-out by means of a scope
 Remote controlled at a later stadium
Bias Ring
100 K
200 V BIAS PS
Absorber
Faraday Cup
ADC INPUT
50 OHM
09-05-2007
C. Bal
AB/BI/ML
8