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Kévin Pepitone

CLIC project meeting, CERN, December 1st, 2015 Kevin PEPITONE, BE-RF

Drive Beam Injector Gun

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Drive Beam Injector Gun

Kévin Pepitone

CLIC project meeting, CERN, December 1st, 2015 Kevin PEPITONE, BE-RF

Low Energy Electron sourcefrom Thermionic Cathode

at High Intensity

Low Energy Electron sourcefrom Thermionic Cathode

at High Intensity

LEETCHI

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Status of LEETCHI for CLIC

Kévin Pepitone

CLIC project meeting, CERN, December 1st, 2015 Kevin PEPITONE, BE-RF

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Outline

CLIC project meeting, CERN, December 1st, 2015 Kevin PEPITONE, BE-RF

• Introduction and electron beam parameters

• Integration: experimental area, HV deck and control room

• Components: HV components and PLC system

• Diagnostics: electrical and optical diagnostics

• Simulations

• Perspectives

• Conclusions

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Introduction

CLIC project meeting, CERN, December 1st, 2015 Kevin PEPITONE, BE-RF

Conceptual design report (EDMS 1234244)

LEETCHI

Parameters Baseline

Beam energy 140 keV

Beam current 5 to 7 A

Pulse length 140 µs

Emittance (RMS) < 20 mm mrad

Repetition rate 50 Hz

Beam power 4,9 to 6,9 kW

Shot to shot charge variation 0.1 %

Flat top charge variation 0.1 % after correction

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Electron beam parameters

CLIC project meeting, CERN, December 1st, 2015 Kevin PEPITONE, BE-RF

Parameters Baseline

Beam energy 140 keV

Beam current 5 to 7 A

Pulse length 140 µs

Emittance (RMS) < 20 mm mrad

Repetition rate 50 Hz

Beam power 4,9 to 6,9 kW

Shot to shot charge variation 0.1 %

Flat top charge variation 0.1 % after correction

From a thermionic cathode

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Integration

CLIC project meeting, CERN, December 1st, 2015 Kevin PEPITONE, BE-RF

162/R-002

6330

2750

CLINFTLA0100

High voltage

Relay Ross150 kV

Insulating transformer to produce 220 Vac

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Integration – Experimental area

CLIC project meeting, CERN, December 1st, 2015 Kevin PEPITONE, BE-RF

HV deck connected to the -140 kV

High voltage DC power supply-200 kV/10 mA

Capacitor10 nF / 150 kV

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Integration – HV deck

CLIC project meeting, CERN, December 1st, 2015 Kevin PEPITONE, BE-RF

Pulser power supply-1000 V at repetition rates up to 1 kHz

Bias power supply300 V / 450 mA

Heater power supply15 V / 10 A

PLC

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Cathode and connector

CLIC project meeting, CERN, December 1st, 2015 Kevin PEPITONE, BE-RF

Ground

+

- 140 kV

Anode

Cathode

Electron beam

Grid

HV pulser-1000 V

Heater PS15 V, 10 A

Bias PS+300 V, 0.45 A

220 VInsulating transformer

220 V

++

+

Cont

rol i

nter

face

PL

COptical fibre

PLC in the control room

HV deck

CathodeCPI YU156

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Cathode and connector

CLIC project meeting, CERN, December 1st, 2015 Kevin PEPITONE, BE-RF

+220 VInsulating transformer

-140 kV

Heater +

Pulser +

Pulser -

Heater -Bias -

Bias +

Vadim Soldatov

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Integration – Control room

CLIC project meeting, CERN, December 1st, 2015 Kevin PEPITONE, BE-RF

Danish Ali Nawaz

PLC

Media converterVacuum gauges

PLC touch screen

HVPS remote

Ion pumps PS

Solenoids PS

Contactors

Delay generator

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Dump and Diagnostics

CLIC project meeting, CERN, December 1st, 2015 Kevin PEPITONE, BE-RF

3D drawing (CATIA)

Graphite dump (diameter at the beginning : 40 mm, total

length : 390 mm)Copper holder with

water-cooling channels

Water

Alex Vamvakas

Energy deposition calculated with Geant4 for 140 keV, 5A, 140 µs electron beam

3D thermal analysis (ANSYS)

Energy deposition

0 20 40 60 80 100 120 140 1600

200

400

600

800

1000

Ede

p (

J/g)

r (µm)0 50 100 150 200 250 300 350 400

0.0

0.2

0.4

0.6

0.8

Ede

p (

J)

z (mm)

Integrated energy deposition as a function

of length

Cedric Delory

Northstar VD-150230 kV, 20 MHz

BergozACCT-S-C8

OTR with silicon carbide target 50 mm diameter

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Simulations

CLIC project meeting, CERN, December 1st, 2015 Kevin PEPITONE, BE-RF

Current dependence of the emittance for the 8

mm cathode (EGUN)

MAGIC simulation example of the electron gun

Focusing coilBucking coil

Cathode r = 8 mm

r-z at 10 ns

Electrical field simulations in the cathode region to check

possible breakdown locations (Flux2D).

Maximum surface field 14 kV/cm

Jacques Gardelle, CEABruno Cassany, CEARomain Pecquois, CEASteffen Doebert

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Perspectives

CLIC project meeting, CERN, December 1st, 2015 Kevin PEPITONE, BE-RF

Parameters Baseline

Beam energy 140 keV

Beam current 5 to 7 A

Pulse length 140 µs

Emittance (RMS) < 20 mm mrad

Repetition rate 50 Hz

Beam power 4,9 to 6,9 kW

Shot to shot charge variation 0.1 %

Flat top charge variation 0.1 % after correction

40 kV prototype of the modulatorDuring HV tests

Modular 7.5 kV board

-150µ -100µ -50µ 0 50µ 100µ 150µ 200µ 250µ 300µ 350µ

-40k

-30k

-20k

-10k

0

Tens

ion

(V)

Temps (s)

Voltage waveform on 4.5 kΩ resistive load

Ve

ETAGE N

ETAGE 2

ETAGE 1

S1

Sr1

Sn

Srn

S2

Sr2

Dch

Dch

Dch

Dch

Dch

Dch

Dbp

Dbp

Dbp

C

C

C

Vs

Ve

ETAGE N

ETAGE 2

ETAGE 1

S1

Sr1

Sn

Srn

S2

Sr2

Dch

Dch

Dch

Dch

Dch

Dch

Dbp

Dbp

Dbp

C

C

C

Vs

Ve

ETAGE N

ETAGE 2

ETAGE 1

S1

Sr1

Sn

Srn

S2

Sr2

Dch

Dch

Dch

Dch

Dch

Dch

Dbp

Dbp

Dbp

C

C

C

Vs

Schematic of the modulator during Charging and Discharging

Bruno Cassany, CEABaptiste Cadilhon, CEARomain Pecquois, CEA

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Conclusions

CLIC project meeting, CERN, December 1st, 2015 Kevin PEPITONE, BE-RF

• Integration and installation of the gun in the area are completed• Vacuum is good• New components are expected:

Optical diagnosticDumpConnector

• The first tests with short pulses beams will be performed in 2016• The tests with long pulses at 50 Hz should be performed in 2016

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Thank you for your attention

CLIC project meeting, CERN, December 1st, 2015 Kevin PEPITONE, BE-RF