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Details. #2907 Thurs 19 th April Shift 2 #2908 Thurs 19 th April Shift 3 Used FEL-like set-up from most recent FEL shift #2900 60 pC BC = -14/+12 LC phased for minimal energy spread post linac EMMA LeCroy Scope used Triggered from INJ-BPM-02 signal

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  1. Details • #2907 Thurs 19th April Shift 2 • #2908 Thurs 19th April Shift 3 • Used FEL-like set-up from most recent FEL shift #2900 • 60 pC • BC = -14/+12 • LC phased for minimal energy spread post linac • EMMA LeCroy Scope used • Triggered from INJ-BPM-02 signal • Measured TOF on AR2-BPM-01 and ST1-BPM-01 TOF 2 Trigger TOF 1

  2. #2907 AR2-BPM-01 • Energy acceptance of post-linac beam (range over which saw signal on PID and AR2-BPM-01) was roughly 30 mm on AR1-1 (D = 80 cm), i.e. 3.75 % • Attenuator on TOF BPM connection (fastened strongly to scope). B = AR2-BPM-1 two peaks separated by ~ 120 pS A = INJ-BPM-01 Mean(B) – Mean(A) (pS) energy deviation of beam (fraction)

  3. ST1-BPM-01 • It’s ¾ stripline, not ¼ as we thought. No “zero crossing” feature • Same two peak structure seen the in TOF, though less pronounced

  4. #2908 AR2-BPM-01 • Removed attenuator (pair of scissors!) “two state” TOF (macro-jitter) even more pronounced since measurement of micro-jitter much sharped (gaussians narrower)

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