1. The ABP/HSC section needs a 4 port Network Analyzer for beam impedance measurements O.Berrig and J.Kuczerowski Thanks to F.Caspers and C.Vollinger As we all know, a good tool is half the job HSC = Hadron Synchrotron Collective effects

2. Beam Impedance measurements are high precision Network Analyzer DUT = Device Under Test The Network Analyzer sends out a sine wave A linear device i.e. a device without active electronics, always converts an input sine wave to an output sine wave - but with different amplitude and different phase. It is exactly the amplitude and phase change that we want to know ! The Network Analyzer has an extremely narrow band comb filter, which is centered on the same frequency as the one that is sent out

3. Wire scanner measurements needs 4 port Network Analyzer In general, a differential measurement needs 2 ports. Differential measurements are normally needed for three reasons: 1)Engineering constraints (as we have it in wire scanners) 2)Noisy environments 3)Long cables

4. Transverse Beam Impedance measurements can be done easier with 4 port Network Analyzer Using 4 ports avoids the non-linearities in the hybrids and makes the measurement less prone to human errors

5. Automatic measurements requires automatic calibration unit After an initial measurement of the approximate position of the resonance frequencies; a narrow calibration can be done automatically around each frequency. Each calibration will contain 1601 points (for 1601 frequencies around each resonance frequency). NB! There are some disagreements if we really need narrow calibrations to find the Q-factors for the resonances. Maybe swept frequency measurements could be used instead?

6. E5071 Network Analyzers in CERN E5071CVALUCH 864-R-C1517-11-2011 160072 E5071CVALUCH 864-R-C1501-03-2011 160003 2838483E5071C, 9kHz-4.5GHz. 2-portVALUCH864-R-C1527.08.2008 4736785E5071C. 4-portVALUCH864/R-C1505.09.2011 4483087E5071C. 4-portTRANQUILLEAD15.10.2010159950 4130906E5071C. 2-portTIMEO17/R-01525.06.2009136775 E5071CSCHWERG252-1-01809-01-2012161851 4788986E5071C, 8.5GHz 4-portSCHWERG252-1-01804.11.2011 2520524E5071C. 2-portCHANEL9-1-02116-08-2007125907 4332129E5071C. 4-portCASPERS19/S-00321-04-2010 To be investigated: What about the electronic pool, could we borrow from them? E5071C M.Wendt BE-BI-QP 866/1-A26BE-BI-QP866/1-A26

7. Requirements Vector Network Analyzer: 4 ports. Frequency range: kHz to 3-4 GHz With Timing option Automatic calibration kit needed Possible vendors: Keysight – successor of Agilent (selling through retailers – not directly from Keysight) Rohde & Schwarz Anritsu

8. Pro and Cons for purchasing a 4 port network analyzer Pro: Time gained because we do not have to look for someone to lend us a 4 port network analyzer (This only happens for special measurements e.g wire scanner). Also removes the de-motivational effect of having to “beg & borrow” Possibility of measuring several ports simultaneously (e.g. measure horizontal and vertical ports simultaneously on a wire scanner) With an extra network analyzer, we can do measurements in the lab, while the other network analyzer does automatic measurements in other parts of CERN Transverse measurements becomes easier and less error prone. Software only need to be written for one network analyzer type. Saves manpower. Cons: Price. Approximately 50 kCHF for network analyzer and automatic calibration kit. We have already bought one hybrid (2000+ CHF). This will now only be used rarely e.g. when several differential measurements needs to be done simultaneously. We could sell the Hybrid to the BI group (TID) and borrow it in the rare cases we need it.