news from tbts
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News from TBTSCLIC RF Structure Development Mtg,
Alexey Dubrovskiy and CTF team
RF measurements
PETS 12GHz
ACS: 12WDSDVG1.8
- RF Diode & IQ measurements
Drive beam
Probe beam
PETS output
ACS input
Loop output
ACS output
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The expected attenuation is 77% => <15% RF measurement inconsistency
Diode power measurement
RF measurements and Acceleration
PETS 12GHz
ACS: 12WDSDVG1.8
- RF Diode & IQ measurements
Drive beam
Probe beam
PETS output
ACS input
Loop output
ACS output
All Diode and PETS and Loop output IQ signals are consistent with acceleration.
Estimated Acceleration from Diodes
Estimated Acceleration from IQs
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Illustration of BDs
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PETS extracted PETS reflected
Attenuated forward Attenuated reflected
ACS forward ACS reflected
ACS transmittedDrive beam current
BD without reflection
BD in the waveguide
No BD
PETS loop conditioning
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PETS output peak power PETS Vacuum level
Pulse length at 75% of pp
Pulse length at 90% of pp
Number of BD
Accumulated BDR
* BD detection is based on the reflected power
PETS attenuator conditioning
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PETS output peak power Expected attenuated power
Pulse length at 75% of pp
Pulse length at 90% of pp
Number of BD
Accumulated BDR
* BD detection is based on the missing energy
PETS2ACS waveguide conditioning
7
06.07.11
CLI
C R
F Str
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Develo
pm
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Mtg
Ale
xey D
ubro
vsk
iy a
nd C
TF
team
PETS output peak power
Pulse length at 75% of pp
Pulse length at 90% of pp
Number of BD
Accumulated BDR
* BD detection is based on the missing energy
Illustration of BDs
8
06.07.11
CLI
C R
F Str
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Develo
pm
ent
Mtg
Ale
xey D
ubro
vsk
iy a
nd C
TF
team
PETS extracted PETS reflected
Attenuated forward Attenuated reflected
ACS forward power ACS reflected
ACS transmitted ACS Forward Phase
BDs in the recirculation loop
High reflection from the ACS. Is it a BD in the ACS?
No BDs in the waveguide
ACS conditioning
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Ale
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nd C
TF
team
Forward peak power Pulse length at 75% of pp
Number of BD
Accumulated BDR
* BD detection is based on the missing energy, pulses with upstream BDs are excluded
Number of BD
Accumulated BDR
* BD detection is based on the missing energy
ACS BD vs Acceleration
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06.07.11
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TF
team
Forward peak power
Accumulated BDR
* BD detection is based on the missing energy, pulses with upstream BDs are excluded
Measured acceleration
96 MV/m105 MV/m
113 MV/m 120 MV/m 127 MV/m 133 MV/m
ACS BDR vs Acceleration
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BDR vs Acceleration
The latest news from the last night
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Successful run over the night with the stable beam conditions
Conclusions
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06.07.11
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• The RF measurement has been improved, but not finished yet • The major number of BDs appear nearby the variable attenuator• The BDR in the ACS is in the order of 10-3 at 100MV/m• The TBTS night operation has been successfully established• The future operation will continue the RF system conditioning and DBR measurement.
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