High Power RF System for the Linac 4

High Power RF System for the Linac 4 spare RFQ

3 Me. V Layout (schematics) RF load LEP Klystron + garage Water cooling distribution (not shown) WR 2300 – RF power distribution 1. 3 MW circulator + chassis Modulator (not schown) Controls racks

3 Me. V Layout (as installed)

High Power System for the new RFQ (1/2) • • • Same/similar implementation RF power equipment: • 1. 3 MW LEP klystron (modified for L 4) -> spare Linac 4 • 1. 3 MW LEP circulator -> spare Linac 4 • WR 2300 FH WG • 352 MHz RF loads -> ‘a priori’ not Linac 4 spares Equipment loaned to ESS Modulator: 2 Hz or ‘’PPT-50 Hz’’: My opinion! • A spare ’RFQ’ Linac 4 modulator would be optimal • Reduced workload on EPC (I suppose) • Reduced footprint • Reduced water cooling requirements for HPRF (<100 l/min total) -> no noise in B 152 • In Linac 4, possibilities to install the modulator RFQ in line with the klystron, instead of behind it: • Easy access with the overhead crane • Pre-installation of the spare modulator non longer necessary • ‘’PPT-50 Hz’’: • Footprint? Water cooling? Noise?

High Power System for the new RFQ (2/2) • • Cabling: • RF cabling: similar to Linac 4, same signals • Controls: similar to Linac 4, same signals • High voltage: similar to Linac 4, same signals! Important for modulator! Controls/interlocks: • Should be strictly identical to Linac 4 control units -> spare ‘like’ • Same for the modulator

Summary • Equipment mostly available: • Mostly Linac 4 spares • Modulator choice to be confirmed • ~ 2 Hz operation seems the most convenient place for B 152 (sound of water flow ? ? ) • Equipment, cabling, controls -> to my opinion this test stand should be a sister ship of the L 4 RF power units