MultiBeam IOT Test Stand CERN ESS Collaboration MBIOT

Multi-Beam IOT Test Stand CERN ESS Collaboration MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 1

Index ◎Accelerators ◎CERN ◎BE-RF-PM Section ◎ESS & CERN’s interests ◎MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 2

Accelerators A lot!!!! Energy! MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 3

Accelerators MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 4

Accelerators MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 5

CERN & its accelerators ◎Accelerator chain: ○ Linac 2 (50 Me. V, 31. 4 %) ○Booster (1. 4 Ge. V, 91. 6 %) ○PS (25 Ge. V, 99. 93 %) ○SPS (450 Ge. V, 99. 9998 %) ○LHC (13 Te. V, 99. 9999991 % @ 7 Te. V) ◎ Detectors: CMS, LHCb, ALICE, ATLAS MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 6

BE-RF-PM Section Beams Department Responsible for: ◎ Beam generation ◎ Acceleration ◎ Diagnostics ◎ Controls and Performance ◎ Optimization for the accelerator complex RF Group Responsible for the accelerating and damping systems: ◎ Operation ◎ Maintenance ◎ Upgrades ◎ Improve designs ◎ R&D for future machines MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 7

BE-RF-PM Section 800 MHz Electrosys Power Modules Section Responsible for: ◎ RF Power systems in PS, SPS and LHC ◎ RF Power Couplers for all CERN projects 800 MHz Cavities MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 8

BE-RF-PM Section 200 MHz Cavities Siemens & Philips Power Amplifiers MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 9

ESS & CERN’s interests MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 10

ESS’ High Beta ESS will develop the most powerful proton linac to date (Energy of 2 Ge. V) ◎In this chain: High Beta ◎704 MHz, 3. 5 ms, 1. 1 MW Elliptical SRF Illustration: ESS MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 11

ESS’ High Beta RF Source Klystron ◎ RF field modulates a constant beam ◎ Class A amplifiers ◎ No RF, no output but full input ◎ For ESS’ operating point efficiency of 45 % Eric Montesinos MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 12

ESS’ High Beta RF Source IOT MB-IOT ◎ RF voltage between grid and cathode ◎ Bunched electrons accelerated by DC voltage ◎ Class C amplifiers ◎ No RF, no output very little input ◎ For ESS efficiency up to 70 % Eric Montesinos MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 13

CERN’s SPL Linac 4 in the latest stages of development Possible upgrade: ◎SPL (Superconducting Proton Linac) ◎Energy: 2. 5 Ge. V – 5 Ge. V ◎704 MHz ◎1. 5 MW and 2 ms From: http: //rcalaga. web. cern. ch/rcalaga/704 MHz/ MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 14

Multi Beam IOT or High-Power IOT Currently available: ◎IOT (Inductive Output Tube) ◎Power limit ~ 60 k. W @ 800 MHz Needs for ESS’ applications: ◎1. 2 MW, 3. 5 ms - 14 Hz pulse, 5. 6 % duty cycle Needs for CERN’s applications: ◎1. 5 MW, 2 ms - 50 Hz pulse, 10 % duty cycle No available IOT can be used! 800 MHz IOT ESS invests in the development of MB-IOT CERN & ESS agree to collaborate for test stand MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 15

MB-IOT Test Stand Objective: ◎ Demonstrate the device’s functionality ◎ Measure its characteristics ◎ Performance Characteristics: ◎ Maximum flexibility ◎ Satisfy the device’s needs ◎ Safety of personnel & equipment ◎ Cost efficient MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 16

MB-IOT Test Stand MB-IOT needs: ◎Filament power supplies ◎Grid power supplies ◎Input driver/s (15 k. W) ◎High Voltage Power supply (50 k. VDC) ◎RF dummy load (100 k. W) ◎Air and water cooling Other needs: ◎Control: ensure safety of equipment and personnel ◎Measures: demonstrate MB-IOT’s performance MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 17

References ◎A. Zolfghari et al. , Comparison of Klystron and Inductive Output Tubes (IOT) Vacuum-electron Devices for RF Amplifier Service in Free-Electron Lasers, Proceedings of EPAC 2004, Lucerne, Switzerland ◎https: //project-physicsteaching. web. cern. ch/projectphysicsteaching/english/brochures/lhc-guide. pdf ◎Morten Jensen, Development of high-power IOTs as an efficient alternative to klystrons, Energy for Sustainable Science, 24 October 2013, CERN ◎Eric Montesinos, CAS, Accelerators for Medical Applications, Vösendorf, Austria, 26 May - 5 June, 2015 ◎https: //europeanspallationsource. se/elliptical-srf ◎http: //rcalaga. web. cern. ch/rcalaga/704 MHz/ ◎Josué Rodriguez Diez, Construction and Commissioning of Electronic Test Benches, 1 st Workshop of the Spanish Traineeship Programme FTEC 2015 MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 18

Thank you! Any questions MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM

MB-IOT Test Stand Heater/Filament Electrons from Cathode Heat from filament Power from supply Cathode Heater Power Supply Heater MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 20

MB-IOT Test Stand Grid Passing through grid Grid bias Grid Imposed by power supply voltage e- Grid Power Supply MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 21

MB-IOT Test Stand Input Cavity Bunching of electrons Sinusoidal electrical field grid-cathode Grid e- Coupled from antenna Input loop e- Delivered from driver MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM Driver 22

MB-IOT Test Stand High Voltage Power Supply Acceleration e- Constant electric field HVPS e- Anode Voltage from power supply MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 23

MB-IOT Test Stand Output loop To an RF Load Output cavity e- RF Power RF Load e- Provided by electrons in output cavity MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 24

MB-IOT Test Stand Collector e- Electrons stopped by hitting collector e- Electrons stopped MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 25

MB-IOT Test Stand Cooling Undesired heat produced in the process is removed by cooling by: ◎Water ◎Air MB-IOT Test Stand maria. sanchez. barrueta@cern. ch, CERN, BE-RF-PM 26