f Bunch by Bunch Extraction from Recycler Recycler

f Bunch by Bunch Extraction from Recycler § Recycler beam and beam structure Ø Beam structure in Recycler are 53 Mhz bunches with an abort gap, bucket length 19 ns. & bunch lengths of up to 10 -12 ns. Ø Harmonic 588, (84*7) 11. 13 ms rev period Ø Beam sourced from either Booster or Project X Linac (up to 5. 3 E 13/linac pulse) Ø Bunch intensities in range of a few E 10 to 1 E 11 Ø Transverse emittances ~25 p-mm-mr § Extracted beam parameters Ø Bunch length, d. T ~ 10 -12 ns, Pulse separation, DT ~1. 6 us, Should get good Im/Io when bunched in 53 Mhz Ø Spill length ~ 1 ms or 90 turns Ø ~6 bunches/turn ~500(+/-) pulses/ms Ø rep. rate 5 Hz (4 pulses each 1. 4 sec) Aug 1, 2007 MECO 8 Ge. V Recycler Extraction- Johnson 1

f Kicker and Pulser requirements § Extraction Layout Ø Electrostatic septum located 90 degrees up stream of magnetic extraction Lambertson with fast electrostatic kicker 90 degrees upstream to displace beam across septa. e = 25 p-mm-mr Dx ~ 6 s ~ 25 mm b = 40 m -> q ~ 625 mr. 6 s s ~ 4. 2 mm § Extraction Location Ø MI 52 - new connect to P 1 Ø MI 40 - bypass in absorber to “green field” § Kick requirement Ø For 20 k. V and 2” gap need 10 m Ø Put 20 k. V on each plate -> 5 m § Pulser requirements V – voltage on kicker [k. V] L – kicker length [m] G – kicker gap [m] E – beam energy [k. V] Ø ~20 k. V with 6 -8 ns rise/fall time and 10 -12 ns flattop Ø 625 k. Hz burst for 1 ms every 200 ms Aug 1, 2007 MECO 8 Ge. V Recycler Extraction- Johnson 2