Embed Size (px)
Citation preview
Dual mode 5-9-12
30 bph6 bph
TMF
TMR
TERTEF
TMF
TMR
ASTA nowT18 processing without ring
1 June 2011SLAC
Valery Dolgashev, Jim Lewandowski and Stephen Weathersby
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. Vacuum activity mainly on the input side of the structure. 13
breakdowns at this level.
Status of T18 in resonant ring processing
13 April 2011SLAC
Valery Dolgashev, Jim Lewandowski and Stephen Weathersby
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
0 500 1000 1500 20000
2
4
6
8
10
12
Time [ns ]
Pow
er[M
W]
ring inputstructure inputring load
0 500 1000 1500 20000
2
4
6
8
10
12
Time [ns ]
Pow
er[M
W],Pulse
Hea
ting[deg
.C]
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]
structure input
pulse heating
0 500 1000 1500 20000
10
20
30
40
50
60
Time [ns ]
Pow
er[M
W],Pulse
Hea
ting[deg
.C]
0 500 1000 1500 20000
10
20
30
40
50
60
Time [ns ]
Pow
er[M
W]
Pulse shape, 100 ns charging + 600 ns flat
ring input
structure inputring load
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]
structure input
pulse heating
0 500 1000 1500 20000
20
40
60
80
Time [ns ]
Pow
er[M
W],Pulse
Hea
ting[deg
.C]
0 500 1000 1500 20000
20
40
60
80
Time [ns ]
Pow
er[M
W]
Pulse shape, 100 ns charging + 250 ns flat
ring input
structure input
ring load
structure input
pulse heating
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]
0 500 1000 1500 20000
20
40
60
80
Time [ns ]
Pow
er[M
W],Pulse
Hea
ting[deg
.C]
0 500 1000 1500 20000
20
40
60
80
Time [ns ]
Pow
er[M
W]
Pulse shape, 100 ns charging + 100 ns flat
ring input
structure input
ring load
structure input
pulse heating
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]
0 50 100 1500
20
40
60
80
100
120
140
P rocess ing Time [hours ]Ave
rage
grad
ient
[MV/m
],Sum
ofbr
eakd
owns
[10s
]
0 50 100 1500
10
20
30
40
P rocess ing Time [hours ]Pulse
Hea
ting[deg
.C],Sum
ofbr
eakd
owns
[100
s]
0 50 100 1500
20
40
60
80
100
P rocess ing Time [hours ]Ave
rage
Pow
er[M
W],Sum
ofbr
eakd
owns
[100
s]T18 in resonant ring, last ~180 hours of processing up to end of shift on April 21st 2011
1.5 usflat
600 nsflat
250 nsflat
100 nsflat
1.5 usflat
600 nsflat
250 nsflat
100 nsflat
1.5 usflat
600 nsflat
250 nsflat
100 nsflat
0 10 20 30 4010 -7
10 -6
10 -5
10 -4
0.001
Pulse Heating [deg . C ]
Bre
akdo
wnPro
bability[1/pulse
/m]
20 40 60 80 100 120 14010 -7
10 -6
10 -5
10 -4
0.001
Gradient [MV /m ]
Bre
akdo
wnPro
abab
ility
[1/pulse
/m]]
Summary of T18 in resonant ring up to end of shift on April 12th 2011
Valery Dolgashev, Jim Lewandowski and Stephen Weathersby, 13 April 2011
100 ns
1500 ns
600 ns
200 ns400 ns
100 ns
1500 ns
600 ns
200 ns
400 ns
250 ns
250 ns
0 10 20 30 4010 -7
10 -6
10 -5
10 -4
0.001
Pulse Heating [deg . C ]
Bre
akdo
wnPro
bability[1/pulse
/m]
20 40 60 80 100 120 14010 -7
10 -6
10 -5
10 -4
0.001
Gradient [MV /m ]
Bre
akdo
wnPro
abab
ility
[1/pulse
/m]]
Summary of T18 in resonant ring up to end of shift on April 21st 2011
Valery Dolgashev, Jim Lewandowski and Stephen Weathersby, 26 April 2011
100 ns
1500 ns
600 ns
200 ns400 ns
100 ns
1500 ns
600 ns
200 ns
400 ns
250 ns
250 ns
100 ns (2nd experiment)
100 ns (2nd experiment)
![Pageflex Server [document: D-6C78C4C8 00001]...a fee fr te funs f te is is nt an aitinal cst t yu ut ill e ai ut f te fun carges etaile in te rsectus an te releant key features document](https://img.pdfslide.us/doc/110x75/5e27f9424376926a21581599/pageflex-server-document-d-6c78c4c8-00001-a-fee-fr-te-funs-f-te-is-is-nt.jpg)
