Max V Min V 1/e * (Max V – Min V) RF pickup signal (200 ps/pt averaged over 100 pts), 7.5 µs beam τTime (µs) Pickup voltage (V)

Ratio of minimum pickup voltage to maximum pickup voltage (arb. Units) Beam “tuning” 20 MV/m Reduced intensity 30 MV/m Reduced intensity 10 MV/m Reduced intensity 20 MV/m longer pulse length, full intensity 800 psi H psi H 2 20 MV/m reduced intensity 30 MV/m reduced intensity + freq. mod. 10 MV/m reduced intensity 20 MV/m reduced intensity Pulse number Voltage in the cavity with beam

July 25 th, 14:43:23, 800 psi H2, 27.8 MV/m, full beam intensity E E+11 VoltageCurrentChargeProtons

July 25 th, 15:12:38, 800 psi H2, 20 MV/m, reduced beam intensity E E+10 VoltageCurrentChargeProtons

July 25 th, 800 psi H2, 20 MV/m, reduced beam intensity Before RF “problem” After RF “problem” Min pickup V / max pickup V (arb. units) Pulse number

July 25 th, 15:51:47, 800 psi H2, 30 MV/m, reduced beam intensity VoltageCurrentChargeProtons E E+10

July 25 th, 800 psi H2, 30 MV/m, reduced beam intensity Min pickup V / max pickup V (arb. units) Pulse number

July 25 th, 16:06:08, 800 psi H2, 10 MV/m, reduced beam intensity VoltageCurrentChargeProtons E E+10

July 25 th, 800 psi H2, 10 MV/m, reduced beam intensity Min pickup V / max pickup V (arb. units) Pulse number

July 25 th, 16:18:59, 800 psi H2, 20 MV/m, full beam intensity, longer RF pulse E E+11 VoltageCurrentChargeProtons

July 25 th, 16:25:18, 800 psi H2, 20 MV/m, full beam intensity, longer beam length &RF pulse E E+11 VoltageCurrentChargeProtons

Min pickup V / max pickup V (arb. units) Pulse number July 25 th, 800 psi H2, 20 MV/m, full beam intensity, longer beam length &RF pulse

July 25 th, 16:41:04, 950 psi H2, 20 MV/m, full beam intensity VoltageCurrentChargeProtons E E+11

July 25 th, 16:45:16, 950 psi H2, 20 MV/m, reduced beam intensity VoltageCurrentChargeProtons E E+10

July 25 th, 950 psi H2, 20 MV/m, reduced beam intensity Min pickup V / max pickup V (arb. units) Pulse number

July 25 th, 16:54:44, 950 psi H2, 30 MV/m, reduced beam intensity VoltageCurrentChargeProtons E E+10

July 25 th, 950 psi H2, 30 MV/m, reduced beam intensity, frequency modulation Min pickup V / max pickup V (arb. units) Pulse number

July 25 th, 17:11:32, 950 psi H2, 10 MV/m, reduced beam intensity VoltageCurrentChargeProtons E E+10

July 25 th, 17:11:32, 950 psi H2, 10 MV/m, reduced beam intensity Min pickup V / max pickup V (arb. units) Pulse number