Drive Beam Injector Gun Kvin Pepitone CLIC project

Drive Beam Injector Gun Kévin Pepitone CLIC project meeting, CERN, December 1 st, 2015 Kevin PEPITONE, BE-RF 1

LEETCHI Low Energy Electron source from Thermionic Cathode at High Intensity Drive Beam Injector Gun Kévin Pepitone CLIC project meeting, CERN, December 1 st, 2015 Kevin PEPITONE, BE-RF 2

Status of LEETCHI for CLIC Kévin Pepitone CLIC project meeting, CERN, December 1 st, 2015 Kevin PEPITONE, BE-RF 3

Outline • 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 CLIC project meeting, CERN, December 1 st, 2015 Kevin PEPITONE, BE-RF 4

Introduction LEETCHI Conceptual design report (EDMS 1234244) CLIC project meeting, CERN, December 1 st, 2015 Kevin PEPITONE, BE-RF 5

Electron beam parameters Parameters Beam energy Baseline 140 ke. V Beam current 5 to 7 A Pulse length 140 µs Emittance (RMS) Repetition rate Beam power Shot to shot charge variation Flat top charge variation CLIC project meeting, CERN, December 1 st, 2015 From a thermionic cathode < 20 mm mrad 50 Hz 4, 9 to 6, 9 k. W 0. 1 % after correction Kevin PEPITONE, BE-RF 6

2750 Integration 162/R-002 High voltage 6330 CLIC project meeting, CERN, December 1 st, 2015 CLINFTLA 0100 Kevin PEPITONE, BE-RF 7

Integration – Experimental area HV deck Relay Ross DC High voltage Insulating Capacitor connected to 150 power transformer 10 n. Fk. V/ supply 150 to k. V the k. V/10 -140 -200 m. A produce 220 k. V Vac CLIC project meeting, CERN, December 1 st, 2015 Kevin PEPITONE, BE-RF 8

Integration – HV deck PLC Bias power supply 300 V / 450 m. A Heater power supply 15 V / 10 A Pulser power supply -1000 V at repetition rates up to 1 k. Hz CLIC project meeting, CERN, December 1 st, 2015 Kevin PEPITONE, BE-RF 9

Cathode and connector PLC in the control room Cathode Optical fibre Control interface PLC HV deck Bias PS +300 V, 0. 45 A + + Heater PS 15 V, 10 A HV pulser -1000 V Grid Anode Electron beam Cathode CPI YU 156 + 220 V Insulating transformer - 140 k. V + Ground CLIC project meeting, CERN, December 1 st, 2015 Kevin PEPITONE, BE-RF 10

Cathode and connector V k -140 Bias + Heater - Bias - Pulser + 220 V Insulating transformer + Vadim Soldatov CLIC project meeting, CERN, December 1 st, 2015 Kevin PEPITONE, BE-RF 11

Integration – Control room PLC Media converter Vacuum gauges PLC touch screen HVPS remote Delay generator Ion pumps PS Solenoids PS Contactors Danish Ali Nawaz CLIC project meeting, CERN, December 1 st, 2015 Kevin PEPITONE, BE-RF 12

Dump and Diagnostics 3 D thermal analysis (ANSYS) Bergoz ACCT-S-C 8 Northstar VD-150 230 k. V, 20 MHz OTR with silicon carbide target 50 mm diameter Energy deposition calculated with Geant 4 for 140 ke. V, 5 A, 140 µs electron beam Energy deposition Integrated energy deposition as a function of length Cedric Delory CLIC project meeting, CERN, December 1 st, 2015 Kevin PEPITONE, BE-RF 13

Simulations MAGIC simulation example of the electron gun Electrical field simulations in the cathode region to check possible breakdown locations (Flux 2 D). Maximum surface field 14 k. V/cm Current dependence of the emittance for the 8 mm cathode (EGUN) Bucking coil Focusing coil Cathode r = 8 mm r-z at 10 ns CLIC project meeting, CERN, December 1 st, 2015 Kevin PEPITONE, BE-RF Jacques Gardelle, CEA Bruno Cassany, CEA Romain Pecquois, CEA Steffen Doebert 14

Perspectives Modular 7. 5 k. V board Parameters Baseline Schematic of the modulator 40 during k. V prototype of the modulator Charging and Discharging Beam energy 140 ke. V During HV tests Beam current 5 to 7 A Pulse length 140 µs Emittance (RMS) Repetition rate Beam power Shot to shot charge variation Flat top charge variation CLIC project meeting, CERN, December 1 st, 2015 Voltage waveform on 4. 5 kΩ resistive load < 20 mm mrad 50 Hz 4, 9 to 6, 9 k. W 0. 1 % after correction Kevin PEPITONE, BE-RF Bruno Cassany, CEA Baptiste Cadilhon, CEA Romain Pecquois, CEA 15

Conclusions • Integration and installation of the gun in the area are completed • Vacuum is good • New components are expected: v. Optical diagnostic v. Dump v. Connector • 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 CLIC project meeting, CERN, December 1 st, 2015 Kevin PEPITONE, BE-RF 16

Thank you for your attention CLIC project meeting, CERN, December 1 st, 2015 Kevin PEPITONE, BE-RF 17