1. CLIC RF Structure Development Mtg, Alexey Dubrovskiy and CTF team
News from TBTS
CLIC RF Structure Development Mtg,
Alexey Dubrovskiy and CTF team

2. RF measurements Diode power measurement Drive beam PETS 12GHz
PETS output
Loop output
CLIC RF Structure Development Mtg
Alexey Dubrovskiy and CTF team
ACS input
ACS output
Probe beam
ACS: 12WDSDVG1.8
- RF Diode & IQ measurements
The expected attenuation is 77% =>
<15% RF measurement inconsistency 2

3. RF measurements and Acceleration
Estimated Acceleration from Diodes 
Drive beam
PETS 12GHz
PETS output
Loop output
CLIC RF Structure Development Mtg
Alexey Dubrovskiy and CTF team
ACS output
ACS input
Estimated Acceleration from IQs
Probe beam
ACS: 12WDSDVG1.8
- RF Diode & IQ measurements
All Diode and PETS and Loop output IQ signals are consistent with acceleration. 3

4. Illustration of BDs PETS extracted PETS reflected Attenuated forward
Attenuated reflected
BD without reflection
CLIC RF Structure Development Mtg
Alexey Dubrovskiy and CTF team
ACS reflected
ACS forward
BD in the waveguide
ACS transmitted
Drive beam current
No BD 4

5. PETS loop conditioning
PETS output peak power
PETS Vacuum level 
Pulse length at 75% of pp
Pulse length at 90% of pp
CLIC RF Structure Development Mtg
Alexey Dubrovskiy and CTF team
Number of BD
Accumulated BDR
* BD detection is based on the reflected power 5

6. PETS attenuator conditioning
Expected attenuated power
PETS output peak power
Pulse length at 75% of pp
Pulse length at 90% of pp
CLIC RF Structure Development Mtg
Alexey Dubrovskiy and CTF team
Accumulated BDR
Number of BD
* BD detection is based on the missing energy 6

7. PETS2ACS waveguide conditioning
PETS output peak power
Pulse length at 75% of pp
Pulse length at 90% of pp
CLIC RF Structure Development Mtg
Alexey Dubrovskiy and CTF team
Accumulated BDR
Number of BD
* BD detection is based on the missing energy 7

8. Illustration of BDs PETS extracted PETS reflected Attenuated forward
Attenuated reflected
BDs in the recirculation loop
CLIC RF Structure Development Mtg
Alexey Dubrovskiy and CTF team
ACS forward power
ACS reflected
No BDs in the waveguide
ACS transmitted
ACS Forward Phase
High reflection from the ACS.
Is it a BD in the ACS? 8

9. ACS conditioning Pulse length at 75% of pp Forward peak power
Accumulated BDR
Number of BD
* BD detection is based on the missing energy
CLIC RF Structure Development Mtg
Alexey Dubrovskiy and CTF team
Accumulated BDR
Number of BD
* BD detection is based on the missing energy, pulses with upstream BDs are excluded 9

10. ACS BD vs Acceleration Forward peak power Measured acceleration
CLIC RF Structure Development Mtg
Alexey Dubrovskiy and CTF team
113 MV/m
120 MV/m
127 MV/m
133 MV/m
Accumulated BDR
* BD detection is based on the missing energy, pulses with upstream BDs are excluded
105 MV/m
96 MV/m 10

11. ACS BDR vs Acceleration
CLIC RF Structure Development Mtg
Alexey Dubrovskiy and CTF team 11

12. The latest news from the last night
Successful run over the night with the stable beam conditions
CLIC RF Structure Development Mtg
Alexey Dubrovskiy and CTF team 12

13. Conclusions 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.
CLIC RF Structure Development Mtg
Alexey Dubrovskiy and CTF team 13