Dual mode 5-9-12 6 bph 30 bph TMF TMR TMF TMR TEF TER

ASTA now T18 processing without ring Valery Dolgashev, Jim Lewandowski and Stephen Weathersby 1 June 2011 SLAC

T18 sans ring installed. This requires twice the input power to maintain the same gradient as the ring configuration. This test will elucidate the effect of the ring (previous test) on structure performance.

88 MW @ Frequency 1. 142440E+10, 200 ns pulsewidth 88 MW @ Frequency 1.142440E+10, 200 ns pulsewidth. Vacuum activity mainly on the input side of the structure. 13 breakdowns at this level.

Status of T18 in resonant ring processing Valery Dolgashev, Jim Lewandowski and Stephen Weathersby 13 April 2011 SLAC

Two rings couple the input and output power of the T18 (18 cells) travelling wave accelerator structure. Reduces the required input power and hopefully enhances the performance of the structure. Also, the ring configuration is thought to reduce the damaging effects of breakdowns by distributing the breakdown power over time.

Pulse shape, 100 ns charging + 1500 ns flat structure input ring load structure input ring input pulse heating File: ppm_data_Mar29_2011, trace#: 1200 with time stamp:{29,3,2011,10,29,51,210} PulseLength:1.54 [us] Pulse Heating: 8.63429 [deg. C]

Pulse shape, 100 ns charging + 600 ns flat structure input structure input ring load ring input pulse heating File: ppm_data_Apr05_2011 , trace#: 1200 with time stamp: {5,4,2011,8,39,44,128} PulseLength: 0.64 [us] Pulse Heating: 34.037 [deg. C]

Pulse shape, 100 ns charging + 250 ns flat structure input structure input ring input pulse heating ring load File: ppm_data_Apr12_2011, trace#: 1200 with time stamp:{12,4,2011,8,41,20,757} Max. PulseLength:0.28 [us] Pulse Heating: 24.885 [deg. C]

Pulse shape, 100 ns charging + 100 ns flat structure input structure input ring input pulse heating ring load File: ppm_data_Apr20_2011 , trace#: 1200 with time stamp: {20,4,2011,8,22,35,155} PulseLength: 0.12 [us] Pulse Heating: 18.169 [deg. C]

T18 in resonant ring, last ~180 hours of processing up to end of shift on April 21st 2011 100 ns flat 250 ns flat 1.5 us flat 600 ns flat 100 ns flat 250 ns flat 1.5 us flat 600 ns flat 1.5 us flat 600 ns flat 250 ns flat 100 ns flat

Summary of T18 in resonant ring up to end of shift on April 12th 2011 250 ns 400 ns 200 ns 200 ns 1500 ns 250 ns 100 ns 1500 ns 100 ns 600 ns 600 ns 400 ns Valery Dolgashev, Jim Lewandowski and Stephen Weathersby, 13 April 2011

Summary of T18 in resonant ring up to end of shift on April 21st 2011 250 ns 400 ns 200 ns 200 ns 1500 ns 250 ns 100 ns 1500 ns 100 ns 600 ns 600 ns 400 ns 100 ns (2nd experiment) 100 ns (2nd experiment) Valery Dolgashev, Jim Lewandowski and Stephen Weathersby, 26 April 2011