Toroid System for Spring 2012 HPRF Beam Run

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Toroid System for Spring 2012 HPRF Beam Run B. Freemire IIT 2/28/12

Toroid System for Spring 2012 HPRF Beam Run B. Freemire IIT 2/28/12

Setup • All cores had 5 turns • Tested 1 core from previous beam

Setup • All cores had 5 turns • Tested 1 core from previous beam test • Tested 2 new cores • Tested 2 new + 1 old core • Used aluminum shielding as a 1 turn transformer, driven by a function generator (square wave, 100 k. Hz) • Used 500 and 1 kΩ resistors 500 or 1 kΩ 25 or 50Ω

1 kΩ 1 Core Old Toroid Current of 8. 86 V / 1000Ω =

1 kΩ 1 Core Old Toroid Current of 8. 86 V / 1000Ω = 8. 86 m. A Current of 8. 47 V / 500Ω = 16. 9 m. A Expect 8. 86 m. A / 5 turns * 50Ω = 86. 6 m. V Measured 82. 6 m. V Fit 87. 6 m. V Expect 16. 9 m. A / 5 turns * 50Ω = 169 m. V Measured 156 m. V Fit 164 m. V 500Ω

1 kΩ 2 Core New Toroids Current of 17. 6 V / 1000Ω =

1 kΩ 2 Core New Toroids Current of 17. 6 V / 1000Ω = 17. 6 m. A Expect 17. 6 m. A / 5 turns * 25Ω = 88. 0 m. V Measured 90. 3 m. V Fit 87. 5 m. V

1 kΩ 3 Core (2 New + 1 Old) Current of 8. 48 V

1 kΩ 3 Core (2 New + 1 Old) Current of 8. 48 V / 1000Ω = 8. 48 m. A Current of 8. 31 V / 500Ω = 16. 6 m. A Expect 8. 48 m. A / 5 turns * 50Ω = 84. 8 m. V Measured 85. 7 m. V Fit 84. 8 m. V Expect 16. 6 m. A / 5 turns * 50Ω = 166 m. V Measured 169 m. V Fit 173 m. V 500Ω

Summary Core Current (m. A) Expected V (m. V) Measured V (m. V) Diff.

Summary Core Current (m. A) Expected V (m. V) Measured V (m. V) Diff. (m. V) % Fitted V Diff. (m. V) % L (µH) τ (µs) 1 Core, 500 Ω 16. 9 169 156 -14 -8. 97 164 -5 -3. 05 73. 6 1. 47 1 Core, 1 kΩ 8. 86 86. 6 82. 6 -4. 0 -4. 84 87. 6 1. 0 1. 14 75. 7 1. 51 3 Cores, 500 Ω 16. 6 169 3 1. 78 173 7 4. 05 65. 2 1. 30 3 Cores, 1 8. 48 kΩ 84. 8 85. 7 0. 9 1. 05 84. 8 0. 00 67. 3 1. 35 For reference, lowest beam intensity from last run: This is the average current, not instantaneous (bunch length is much shorter) This is ~3% of maximum intensity (10^9 p/bunch) and fits the lowest beam intensity in the run plan So the expected minimum signal should be ~9. 6 m. V

MCR • Additionally it has been requested that a copy of the toroid signals

MCR • Additionally it has been requested that a copy of the toroid signals be fed into ACNET so that they are available in the MCR for beam tuning purposes • I am looking into high impedance amplifiers with a 50 Ω output for this purpose

Conclusions • This configuration of toroids seems sufficient for the beam test – <

Conclusions • This configuration of toroids seems sufficient for the beam test – < 10% difference between measured and expected signals – < 5% on all but one measurement – No big difference between fitted and measured values • 10 m. V / m. A into 50 Ω • Waiting on Ben O. & crew to drill collimator cradle assembly – Then can install collimators/toroids