Controlled Transverse Blowup with ADT MD block #3 / th August 2011 presented by W. Hofle T. Levens, S. Redaelli, F. Roncarolo, R. Schmidt, D. Valuch OP crew: L. Ponce, R. Giachino W. Hofle - LSWG 13. September 2011

Preparations for MD (1) W. Hofle - LSWG 13. September 2011 white noise generated on FPGA running at 40 MS/s deployed on a test crate in SR4 with gating connected to all dampers of beam 2 (H and V plane) noise can be filtered by IIR lowpass filter noise triggered for up to 1 second, repetitively also, typically 5x (D. Valuch, M. Jaussi, D. Jacquet, T. Levens) gate, 11  s (example)

W. Hofle - LSWG 13. September 2011 Preparations for MD (2) the noise generator is a 43-bit long linear feedback shift register (for every bit of the output word) running at 40MHz the sequence repeats after 2^43-1 clock cycles = i.e. 61 hours currently not restarted at every excitation burst, but left free-running feedback polynomial is x^43+x^42+x^38+x^37+1 generates 14 bit words every 40 MHz clock cycle the noise is then low-pass filtered by a two sections second-order IIR filter Application note from Xilinx:

W. Hofle - LSWG 13. September 2011 Preparations for MD (3) IIR lowpass filter (500 kHz) 1 or 2 sections possible, 2 sections used

W. Hofle - LSWG 13. September 2011 Part 1, 2 pilot bunchesPart 2, 12 nominal bunches Part 3, loss maps (one nominal bunch) Three parts with different filling patterns / intensities (always beam 2)

Excitation full bandwidth, Amplitude 0.2, v- plane Beam 2 Excitation reduced bandwidth 500 kHz, Amplitude 0.2, v- plane Beam 2 Excitation full bandwidth, Amplitude 1.0, v- plane Beam 2 Excitation full bandwidth, Amplitude 1.0, h-plane Beam 2 Excitation full bandwidth, Amplitude 1.0, h- plane Beam 2 1:303:36 Adjustment of system BLMs at B2 TCP A6.R7 (RS09) log/lin scale part 1: setting-up with pilots (gating delay) testing

W. Hofle - LSWG 13. September 2011 Selective blow-up (2 pilots) 2  m 4  m

W. Hofle - LSWG 13. September 2011 Selective blow-up (2 pilots) 2  m 10  m

W. Hofle - LSWG 13. September 2011 Selective blow-up 2 pilots) 2  m 18  m stops at 18  m

W. Hofle - LSWG 13. September 2011 batch selective blow-up no blow-up 2x6 bunches spaced 925 ns (+pilot)

W. Hofle - LSWG 13. September 2011 blow-up / lossno blow-up Batch selective blow-up - losses

W. Hofle - LSWG 13. September 2011 damper loss map3 rd order resonance Comparison loss maps

W. Hofle - LSWG 13. September 2011 damper loss map3 rd order resonance Comparison loss maps (details)

W. Hofle - LSWG 13. September 2011 Differences of losses vs. time 3 rd order resonance and damper (feedback) ON/OFF