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BDS Front-End FFB System

BDS Front-End FFB System. Glen White. FB-2. FB-1. BDS FFB Location. 2 Kicker / BPM pairs to straighten train and remove jitter at entrance to BDS. FB-1: Kicker: upstream QMBSY2 BPM: upstream QD90C FB-2: Kicker: upstream QD90C BPM: upstream QD90. Incoming Jitter from LINAC.

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BDS Front-End FFB System

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  1. BDS Front-End FFB System Glen White

  2. FB-2 FB-1 BDS FFB Location • 2 Kicker / BPM pairs to straighten train and remove jitter at entrance to BDS. • FB-1: • Kicker: upstream QMBSY2 • BPM: upstream QD90C • FB-2: • Kicker: upstream QD90C • BPM: upstream QD90

  3. Incoming Jitter from LINAC • Vertical positions/angles of bunch train exiting LINAC (subtract mean values to get real offsets- 2 bits of beamline modeled separately in simulation). • 200 Seeds of 0.2s model ‘K’ GM + 100nm Quad jitter. • (1 sigma y = 2.6 um at BDS entrance) +/- 4.0 um +/- 0.07 urad +/- 0.7 um +/- 0.02 urad

  4. Kicker Requirements • Need to zero BPM readings to remove train shape and train-train jitter ~(3.6 um BPM1; 8.3 um BPM2). • Assume 1m length TESLA FFB stripline kicker design (max 0.15urad kick @ 250 GeV). • With calculated R34’s between BDS entrance and BPMs and between kickers and BPMs: • Can correct up to 9.9um (BPM1) and 7.5um (BPM2) per meter of kicker. • Need 0.36m of kicker for FB-1, 1.1m of kicker for FB-2. • Would need more kick in reality to take care of additional errors that build up over longer-timescales due to GM etc. • Specs to come from LINAC 5-Hz feedback studies. • From calculated R34’s between Kickers and IP: • 0.1 sigma y* equates to ~ 3nrad kick (Kicker 1); 116nrad kick (Kicker 2) • 0.1 sigma y’* equates to ~ 14nrad kick (Kicker 1); 5nrad kick (Kicker 2) • Max required resolution: <2%

  5. BPM Requirements • To keep jitter introduced by kickers affecting vertical IP position and angle greater than the 0.1-sigma level, BPM’s require better than the following resolution: • BPM 1: 200 nm • BPM 2: 265 nm

  6. FB Latency • Kicker-BPM distances: • FB-1: 41.4m • FB-2: 34.3m • ToF time + cable time (at 0.9c) + 100ns digital processing time gives latencies: • FB-1: 390ns • FB-2: 340ns • Feedback possible every-other bunch. • Interleaving with ANG+IP FFB systems minimizes jitter-growth impact.

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