UA 9 SPS Cp FM Tank RF Measurement

UA 9 -SPS Cp. FM Tank RF Measurement Results A. Danisi (CERN), T. Demma (LAL), A. Passarelli (CERN), F. Caspers (CERN), C. Vollinger (CERN), J. Kuczerowski (CERN). Acknowledgements: C. Zannini, J. Varela, B. Salvant, V. G. Vaccaro.

UA 9 Cp. FM: Cherenkov detector for proton Flux Measurement Aim: development of a detection chain that counts the number of protons of the deflected halo with a precision of about 5% in the LHC environment (for 100 incoming protons) Constraints : - inside the primary vacuum no degassing materials - very hostile radioactive environment radiation hardness readout electronics at 300 m - small place available compact radiator inside the beam pipe small footprint of the photodetector + cables …. inside the tunnel The Cp. FM: Principle: the Cherenkov light created by the interaction of protons inside the fused quartz radiators will propagate inside the bars and be detected 2 Quartz bars: one for the beam monitoring and another one for background measurements Detection performed by PMTs 10 m from the viewport (quartz fibers bundle) and readout by Wave. Catcher board (300 m away) 03/11/2014 Impedance Meeting UA 9 Cp. FM Tank Impedance Assessment 2

Cp. FM Tank design for installation in SPS 03/11/2014 Impedance Meeting UA 9 Cp. FM Tank Impedance Assessment 3

BBS_QUATTRO Measurements 27/10/2014 Impedance Meeting UA 9 Cp. FM Impedance Assessment – 27. 10. 2014 Impedance Meeting 4

Should we concern about the quartz bars? Without With Quartz 27/10/2014 Impedance Meeting UA 9 Cp. FM Impedance Assessment – 27. 10. 2014 Impedance Meeting 5

Should we concern about the quartz bars? 27/10/2014 Impedance Meeting UA 9 Cp. FM Impedance Assessment – 27. 10. 2014 Impedance Meeting 6

BBS_QUATTRO Measurements § Measurements have been carried out on November 13 -14 th § Probe measurements with damping resistors (courtesy of Jose Varela) § Probe measurements with ferrites (courtesy of Christine Vollinger) § Probe measurements with all-mode coupler (courtesy of Fritz Caspers) § BBS_QUATTRO tank and bench already available in the impedance lab. 03/11/2014 Impedance Meeting UA 9 Cp. FM Impedance Assessment 7

BBS_QUATTRO Measurements § Measurements have been carried out in transmission § The probes have been placed as far as possible from the cavity to reduce coupling. § For the first mode, the same Q measured last time (June) was reproduced (around 2500). § For the second mode, the measured Q was lower (around 1000). 03/11/2014 Impedance Meeting UA 9 Cp. FM Impedance Assessment 8

BBS_QUATTRO Measurements § Measurements with ferrites § 60 mm X 5 mm § First Mode: starting point Q = 2500 Q = 254 Q = 132 Q = 62 03/11/2014 Impedance Meeting Q = 120 UA 9 Cp. FM Impedance Assessment 9

BBS_QUATTRO Measurements § Measurements with ferrites § 60 mm X 5 mm § Second Mode: starting point Q = 750. Q = 380 Q = 750 Q = 508 Q = 68 03/11/2014 Impedance Meeting UA 9 Cp. FM Impedance Assessment 10

BBS_QUATTRO Measurements § Measurements with damping resistors § Different configurations § First Mode: starting point Q = 2500 Q = 554 Q = 228 03/11/2014 Impedance Meeting Q = 383 UA 9 Cp. FM Impedance Assessment 11

BBS_QUATTRO Measurements § Measurements with damping resistors § Different configurations § Second Mode: starting point Q = 750 Q = 125 Q = 110 03/11/2014 Impedance Meeting UA 9 Cp. FM Impedance Assessment 12

BBS_QUATTRO Measurements § § § Measurements with all-mode coupler Different configurations (0 deg, 90 deg, 45 deg) AMC closed on 50 Ω termination. AMC connected to hybrid + 50 Ω. AMC connected to hybrid + Attenuator (6 d. B) + matching network (movable short) 0 deg Q = 750 Q = 600 Q = 580 Q = 150 Q = 35 03/11/2014 Impedance Meeting Q = 20 UA 9 Cp. FM Impedance Assessment 13

BBS_QUATTRO Measurements § § § Measurements with all-mode coupler Different configurations (0 deg, 90 deg, 45 deg) AMC closed on 50 Ω termination. AMC connected to hybrid + 50 Ω. AMC connected to hybrid + Attenuator (6 d. B) + matching network (movable short) 90 deg Q = 750 Q = 110 Q = 87 Q = 39 03/11/2014 Impedance Meeting UA 9 Cp. FM Impedance Assessment 14

BBS_QUATTRO Measurements § § § Measurements with all-mode coupler Different configurations (0 deg, 90 deg, 45 deg) AMC closed on 50 Ω termination. AMC connected to hybrid + 50 Ω. AMC connected to hybrid + Attenuator (6 d. B or 3 d. B) + matching network (movable short) Q = 2500 45 deg Q = 44 Q = 105 Q = 82 Q = 750 Q = 171 45 deg Q = 142 Q = 27 03/11/2014 Impedance Meeting UA 9 Cp. FM Impedance Assessment 15

BBS_QUATTRO Measurements – Q-Summary Situation Mode 1 (920 MHz) Mode 2 (1. 32 GHz) Void Cavity 2500 750 Ferrite (bottom) 254 508 Ferrite (top-bottom) 132 380 Ferrite (sides) 120 68 Ferrite (side symmetric) 62 / 1 Damping resistor (H or V) 554 125 Hanged resistor 383 110 2 resistors 228 / AMC + 50 Ω – 0 deg 35 600 AMC + Matching – 0 deg 20 150 AMC + 50 Ω – 45 deg 105 170 AMC + Matching – 45 deg 44 27 AMC + 50 Ω – 90 deg 2300 110 AMC + Matching – 90 deg 2300 39 27/10/2014 Impedance Meeting UA 9 Cp. FM Impedance Assessment – 27. 10. 2014 Impedance Meeting 16

Thank you for your attention

BBS_QUATTRO Measurements § Measurements with ferrites § 60 mm X 5 mm § First Mode: starting point Q = 2500. Bottom Top & Bottom Q = 132 Q = 254 Sides (Top-bottom symmetric) Sides Q = 120 03/11/2014 Impedance Meeting UA 9 Cp. FM Impedance Assessment Q = 62 18

BBS_QUATTRO Measurements § Measurements with ferrites § 60 mm X 5 mm § Second Mode: starting point Q = 750. Bottom Top & Bottom Q = 508 Q = 380 Sides (Top-bottom symmetric) Sides Q = 68 03/11/2014 Impedance Meeting UA 9 Cp. FM Impedance Assessment 19

BBS_QUATTRO Measurements Outlook 03/11/2014 Impedance Meeting UA 9 Cp. FM Impedance Assessment 20