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Test PETS Designs and Objectives. I. Syratchev. PETS test program overview. Test areas. X-band klystron test stand at SLAC. Two beam test stand CLEX, CERN. Test beam line CLEX, CERN. Access to the high power and full pulse length: 250 ns x 300 MW. High rep. rate. RF source driven. - PowerPoint PPT Presentation
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2nd CLIC Advisory Committee (CLIC-ACE), CERN January 2008
I. Syratchev
Test PETS Designs and Objectives
2nd CLIC Advisory Committee (CLIC-ACE), CERN January 2008
The ultimate PETS high RF power performance
RF power generation from the drive beam
Demonstration of the ON/OFF capability
Study/benchmarking of the beam dynamic in decelerator
X-band klystron test stand at SLAC
Two beam test standCLEX, CERN
Test beam lineCLEX, CERN
Testing of the special RFcomponents
Access to the high power and full pulse length: 250 ns x 300 MW. High rep. rate.RF source driven.
Ob
ject
ives
Test areas
Access to the high power (~200 MW) Pulse length limited to 140 ns. Low rep. rate.Beam driven.
PETS design specifics Scaled (12->11.424) CLIC PETS. Active length 0.23mTwo couplers.
CLIC PETS. Active length 1.0m. Two couplers
CLIC PETS. Active length 0.8m. One coupler
Origin and availability
CERN, spring 2008. CERN, summer 2008.
CIEMAT, Spain, autumn 2008.
PETS test program overview
See details in S. Doebertdedicated talk
PETS target is to generate reliably 136 MW x 250 ns RF pulses
2nd CLIC Advisory Committee (CLIC-ACE), CERN January 2008
Number of tests:#1. Scaled PETS/ no damping#2. Scaled PETS/ with damping #3. RF components
SLAC (11.424 GHz)Access to the high power and full pulse length. With SLED II, 250ns x 300 MW were successfully delivered via single WR90 (S. Tantawi).Operation in a “waveguide mode”.
X-band klystron test stand at SLAC
2nd CLIC Advisory Committee (CLIC-ACE), CERN January 2008
Integration layout for the phase I – PETS power production tests.
Two beam test stand, CLEX, CERN
CLEX 2BTS:Drive beam: 12GHz, 140ns, 30 A (max)CLIC PETS, active length 1.0 m,135 MW will be produced with 20.8 A beam. Access to 270 MW (30 A)
Number of tests:#1. PETS/ no damping material#2. PETS/ with damping material#3. PETS with recirculation (access to the full pulse length)#4. On/Off demonstration (slow)
2nd CLIC Advisory Committee (CLIC-ACE), CERN January 2008
Two beam test stand, CLEX, CERN
2nd CLIC Advisory Committee (CLIC-ACE), CERN January 2008
12 GHz RF components
Directional coupler
GYCOM, Russia
3-dB hybrid
RF and mechanical design, CERNFabrication in CINEL, Italy
RF and mechanical design, CERNFabrication in CINEL, Italy
Dry (stainless steel) RF load
Attenuator/splitter
Scaled from 30 GHz version. GYCOM Russia.
2nd CLIC Advisory Committee (CLIC-ACE), CERN January 2008
P1
0.9
6
0.96
0.96
0.923
PETS with re-circulation
5A, 300 ns
2BTS
DBA
CR
DL
T =13.9ns LPETS=1 mLWG = 1.8 m
η =0.82
0.85
0.15
PETS with recirculation schematic:
P2
0 100 200 3000
50
100
150
135
P1
P2
Time, ns
Pow
er, M
W
In the CTF3 the PETS high power mode (high current) is limited in the pulse length by 140 ns. The re-circulation is a method to increase significantly power production and thus the drive beam current can be used directly from DBA (5A, 3GHz). In this case current pulse can be increased up to 300-400 ns.
RF pulse shapes
P2
P1
2nd CLIC Advisory Committee (CLIC-ACE), CERN January 2008
PETS single bar RF quality control (in collaboration with CIEMAT, Spain)
probeTest set-up schematic view
PETS single bar
side block
Phase/period – 90Frequency – 11.994 GHzVg/C – 0.466
Mode ‘TE10’
The waveguide cross-section is tuned to provide the similar parameters as in a complete PETS
E-field H-field
WR90Taper
PETS bar + 2 side blocks
2nd CLIC Advisory Committee (CLIC-ACE), CERN January 2008
0 50 100 150 200 250 3000
2
4
64.9
0
ami
273.270 si
0
30
60
90
120
150
180
210
240
270
300
330
6
4
2
0
7
3.11
ami
4.222
phhi
S12, amplitude
S12, phase
0 50 100 150 200 250 300200
100
0
100
200179.999
179.6
46
phi
ph1i
273.270 siDistance, mmPhase
Distance, mm
PETS assembly RF quality control (tested at 30 GHz )
2nd CLIC Advisory Committee (CLIC-ACE), CERN January 2008
Fast ON/OFF mechanical prototype study
The objective is to demonstrate the fast – 20 ms and accurate movement (OFF) of the detuning wedges in a vacuum environment.
The electromagnet version developed in TS, CERN
