Status of the PS TFB Hardware Overview Machine results To be done J. Belleman, E. Benedetto, F. Caspers, D. Glenat, R. Louwerse, M. Martini, E. Métral, V. Rossi, J. Sladen, J.M. Nonglaton Acknowledgments: R. Steerenberg, S. Gilardoni Hardware Overview Machine results To be done Alfred Blas APC 30/1/2009

PS TFB Block diagram Green boxes represent devices to be completed Alfred Blas APC 30/1/2009

PS TFB Hardware setup PS TFB Power + electronics 355-R-017 Clock distribution PS CB Hardware setup Power + electronics 355-R-017 Kickers + transformers PS SS 97 Water distribution 355-R-017 Alfred Blas APC 30/1/2009

PS TFB Pick-up amplifiers J. Belleman BW: 20 kHz – 40 MHz 80 dB dynamic range (compatible with ions) Remotely programmable gain Located in the ring below concrete slab Alfred Blas APC 30/1/2009

PS TFB DSPU hardware V. Rossi Alfred Blas APC 30/1/2009

PS TFB DSPU firmware Green boxes represent functions to be completed Alfred Blas APC 30/1/2009

PS TFB Clock generation J. Sladen 1 GHz DDS Receives the frequency program from the PS central building and outputs the 160*Frev (< 80 MHz). Clock Generator Transforms 10 MHz into 1 GHz Alfred Blas APC 30/1/2009

PS TFB Pre-Amplifier Fast Clipping of the output signal 0 and 180o outputs Programmable gain TFM setup Local / Remote control Interface with the PLC control Alfred Blas APC 30/1/2009

PS TFB Power Amplifier R. Louwerse [2.5 kHz – 25 MHz], 3kW – 2ms, 800W – CW Alfred Blas APC 30/1/2009

PS TFB Impedance matching transformers R. Louwerse Input impedance: 50 Ω Output impedance: 100 Ω [ 2kHz – 40 MHz] 3 kW Alfred Blas APC 30/1/2009

PS TFB Kicker F. Caspers, V. Bretin Alfred Blas APC 30/1/2009

PS TFB Kicker Alfred Blas APC 30/1/2009

PS TFB Power loads 50 Ω / 30 dB Attenuator [ DC – 1GHz] 1 kW CW 100Ω to 50Ω resistive transition [ DC – 190 MHz] 1.6 kW CW Alfred Blas APC 30/1/2009

PS TFB PLC Power Control D. Glenat Alfred Blas APC 30/1/2009

PS TFB Operation display J. M. Nonglaton Alfred Blas APC 30/1/2009

PS TFB Results: Automatic delay Resolution=0.4ns Measurement time: 22 us Maximum jitter : 260 ps Precision requirement: 1.1 ns for 10o error at 25 MHz Alfred Blas APC 30/1/2009

PS TFB Machine Results Auto Dly + Hilbert The proper functioning of the automatic delay has been tested during an MD on MDPS (22/09/08) with a copy of the SFTPRO beam. The beam transfer function was measured on the 3.5 GeV plateau and on the 14 GeV plateau. If the phase response of all betatron lines can be superimposed, the delay is correct. The parameters of the automatic delay were set at 3.5 GeV for a proper phase response and the measurements made again at 14 GeV proved that the circuit behaved as expected. The measurements made another day at 1.4 GeV gave the same positive results. BTF of a Q+q betatron line Alfred Blas APC 30/1/2009

PS TFB Results: Notch Filter Alfred Blas APC 30/1/2009

PS TFB Results: Hilbert Filter M= 3 Hilbert Without Notch Filter – set value = 45o With Notch Filter – set value = 45o Alfred Blas APC 30/1/2009

PS TFB Results: Hilbert Filter M= 1 Hilbert Without Notch Filter – set value = 45o With Notch Filter – set value = 45o Alfred Blas APC 30/1/2009

PS TFB Sensitivity to Q measurement With the PU in SS98 and the kicker in SS97, the ideal betatron phase lag within the TFB path can be expressed as follow (qH,V Є [0 , 0.5]): ΔφB-TFB = -111.6o + (536.4o * q) in the case of no delay for the dephasing (2 PUs!) ΔφB-TFB = -111.6o + (896.4o * q) in the case of 1TREV delay for the dephasing (m=1 Hilbert) ΔφB-TFB = -111.6o + (1616.4o * q) in the case of 3TREV delay for the dephasing (m=3 Hilbert) 9o phase error for an error in q of 0.01 with the m=1 Hilbert ( <=> 4.5 kHz error in the FFT) One measurement made on LHC25. 11/11/08 The Q measurements are supposed to have a precision of 100ppm Unfortunately during the tests we had a jitter from cycle to cycle The rf clock of the Q measurement doesn’t take into account the loop errors of the RFLL. Is this the explanation? Alfred Blas APC 30/1/2009

PS TFB Results 30mm p-p initial H error MDPS 1.4 GeV flat cycle with no Chromaticity and no coupling 23/10/08 PSB MD1 beam 55.1010 p injected (3 turns in R3) Injection error obtained by setting PI.KFA45 to 270 kV instead of 300 kV Inj. error Damping: 20mm/ms @ 1.4 GeV (21mm/ms required for the most demanding case: Pilot beam εn = 0.8μm) Power system used for controlled blow-up (slow extraction) and Q measurement 500 μs/div From M. Martini APC 26/5/2005 Alfred Blas APC 30/1/2009

PS TFB Results 30mm p-p initial H error 500 μs/div Zoom top = h position bottom = kick 2μs/div Alfred Blas APC 30/1/2009

PS TFB Results MD 11/11/2008 E. Metral With coupling – No TFB Without coupling – No TFB LHC25 injection plateau at 1.4 GeV with linear H/V coupling (Iskew =-0.3) Without coupling (Iskew = +0.3) See logbook for more details (11/11/08) Last plot taken from a good shot; not always the case (The Betatron phase was set to an empirical fixed value!) Without coupling – With TFB Alfred Blas APC 30/1/2009

PS TFB Results MD 11/12/2008 Q measurement Only the H plane is excited Without coupling – No TFB Only the H plane is excited Alfred Blas APC 30/1/2009

PS TFB Conclusion The MDs on the machine show that the PSTFB fulfills the expected requirements: Kick efficiency Automatic delay Hilbert filter Remote control of the DSPU and of the Power system Usage of the power system for the Q measurements and controlled blow-up Improvements for 2009: Hardware 2 fully loaded DSPU modules instead of the single beta version. 2nd input on the DSPU with a serial delay for the 2nd PU. ( -> lower sensitivity to Q value) 3rd and 4th inputs on the DSPU for the PU SUM signals (normalization of the Delta signal) DSPU input impedance varies with the input attenuation (52 -> 72Ω) Install a driver for a better compatibility with the Q measurement excitation Firmware Notch filter could be modified for a more suitable phase response Q-to-Hilbert-phase LUT should be adapted to take into account the phase errors of the Hilbert (with respect to the command) together with the response of the Notch. Software Q (h and V) measured along the cycle (0.01 precision) and value sent to a GFAS (PA.GSTFBH and PA.GSTFBV) PU control knob to be created (Automatic gain as a function of peak beam intensity ?) Other Q measurement (rev clock used for the sampling of the beam signal precise enough ?) Alfred Blas APC 30/1/2009