09-05-2007 C. Bal AB/BI/ML 1

Linac4 Instrumentation DayFaraday Cups

In order to measure the beam intensity three Faraday Cups will be installed in different places LEBT

Low energy Spectrometer

Low energy Moving Diagnostics Bench for the three DTL

tanks High energy

09-05-2007 C. Bal AB/BI/ML 2

Faraday CupsScheme of Linac4

09-05-2007 C. Bal AB/BI/ML 3

Faraday CupsSpecifications LEBT

Low Energy: 95 keV Commissioning &

Operation Retractable Acceptance FC

ø80 mm Acceptance Tank

ø100 mm

Parameter Quantity

Ion Species H-

Pulse Length 400 µs

Rep. Rate 2 Hz

Beam Power 6 W

Pressure 10-5 mbar

Source Current 80 mA

Bias Voltage 3 kV

09-05-2007 C. Bal AB/BI/ML 4

Faraday CupsMechanical Design LEBT

09-05-2007 C. Bal AB/BI/ML 5

Faraday CupsMechanical Design LEBT

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 6

Faraday CupsSpecifications Spectrometer

Low Energy: 95 keV Temporary installation Commissioning only Fixed Similar design as for LEBT

09-05-2007 C. Bal AB/BI/ML 7

Faraday CupsSpecifications Moving Bench DTL

High Energy: 40 MeV Commissioning only Retractable Requires Cooling Requires Energy

Absorber (levels to be defined)

Design under development

Parameter Quantity

Ion Species H-

Pulse Length 400 µs

Rep. Rate 2 Hz

Beam Power 5.1 kW

Pressure 10-7 mbar

Linac Current 40 mA

Bias Voltage 3 kV

09-05-2007 C. Bal AB/BI/ML 8

Faraday CupsElectronics

Local read-out by means of a scope

Remote controlled at a later stadium

50 OHM

ADC INPUT

200 V BIAS PS

100 K

Absorber Faraday Cup

Bias Ring