1. Dual mode
6 bph
30 bph
TMF
TMR
TMF
TMR
TEF
TER

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

3. 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.

4. 88 MW @ Frequency 1. 142440E+10, 200 ns pulsewidth
88 Frequency E+10, 200 ns pulsewidth. Vacuum activity mainly on the input side of the structure. 13 breakdowns at this level.

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

6. 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.

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

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

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

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

11. 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

12. 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

13. 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