2. BE/RF-IS Contribution to LIU C. Rossi and M. Paoluzzi
LIU – BE/RF Management Team Meeting
31st May 2016

3. Outline Summary of Contributions from IS Section Main Specifications
Resources
Implementation Plan
Present Status
PLAN Overview
Conclusions
BE/RF-IS Contribution to LIU C. Rossi 31st May 2016

4. Summary of Contributions from IS Section
PSB Finemet RF System
10 MHz Upgrade
Increase Fast Feedback Gain in 40/80 MHz Systems
Fast Ferrite Tuner for the 80 MHz cavities:
Working Prototype, in progress
Operational Device, waiting the outcomes of prototype testing
PS Kicker System
BE/RF-IS Contribution to LIU C. Rossi 31st May 2016

5. Main Specifications PSB Finemet® RF System
Beam intensity increase to 1.4∙1013 protons (present value is 1∙1013) ultimate goal 2.5∙1013;
Energy increase to 2 GeV.
Strategy
Strategy
Replace the C02, C04 and C16 systems with identical Finemet® cavities, 36 gaps per ring;
Adopt solid state modular amplifiers;
Upgrade controls and interlocks.

6. Main Specifications 10 MHz Upgrade
From 1.3∙1011 ppb to >2.0∙1011 ppb with 25 ns spacing with Linac4
C11
Standard amp
Upgraded amp
Reduction of the cavity impedance as seen by the beam by a factor 2
Increase the fast feedback gain of the Final amplifier in a uniform and reproducible way for the whole set of amplifiers.
Strategy
New Final amplifier components;
Implement a modular architecture (to reduce repair time);
New amplifier ancillaries (power supplies, RF driver amplifier, L-Bias control) required;
New PLC-based interlock system.

7. Main Specifications 40/80 MHz RF Feedback Increase
Improve the beam longitudinal stability by reducing the cavity equivalent impedance.
The present wide-band feedback is limited at 43 dB gain by the group delay between the feedback amplifiers and the cavity.
Find options to reduce the cable length.
Strategy
Study the system stability with increased wide-band feedback, based on measurements of the present system;
Estimate the feasibility and impact of the upgrade;
Evaluate costs and benefits.
BE/RF-IS Contribution to LIU C. Rossi 31st May 2016

8. Main Specifications 80 MHz Fast Ferrite Tuner
Provide the possibility to operate the same 80 MHz cavity with p and ions in the same supercycle.
p frequency is MHz and Pb frequency is MHz;
A tuning range of 230 kHz is needed.
Strategy
S21 from simulated measurement ports
Install a tuner prototype in the PS during EYETS 2016;
Validate design and power consumption;
Install 3 fast tuners during LS2.

9. Main Specifications Longitudinal kicker system
Dump coupled-bunch instability in multi-harmonic mode.
Parameter
Comment
Frequency range
0.4…5.1 MHz
RF voltage
~ 5 – 6 kV
To be confirmed this year, all modes simultaneously
Residual impedance as seen by the beam
< 50 W at each frev line
~ half of impedance of a 10 MHz accelerating cavity
Impedance reduction when not in use
Gap relays
4 out of 6 gaps operational in 2015 and 5 out of 6 during the 2016 Run.
Strategy
Install a kicker prototype in the PS during LS1 to prove the principle;
Develop and upgrade it until LS2.

10. Resources Staff directly declared for LIU in APT.
The LIU-PSB Manpower in more detail.

11. Resources Total Budget requested for LIU in IS.
Details of the LIU-PS Budget.
Details of the LIU-PSB Budget.
ACTIVITIES
2016
2017
2018
2019
2020
10 MHz Upgrade 80
630
1250
650
40/80 MHz Feedback Upgrade 20
130
200
350
80 MHz Fast Tuner 40
220
PS Longitudinal Kicker 50
393
300
LIU-PS
190
1373
1950
1200

12. Finemet® Implementation Plan
Finemet cores procurement (340 Units)
132 Cores as KEK in kind contribution: delivery March 2017
210 Cores purchase:
MS completed : no European supplier.
IT being dispatched : closing by end of June
To be presented at FC of September
Delivery by June 2017
RF Power Amplifiers (180 Units)
MS completed
IT being dispatched : closing by end of June
To be presented at FC of September
Delivery by end 2017
Ancillary Electronics
Design and construction documentation completed
Production started
Staged delivery until end 2017
DC Power Supplies (164 Units)
MS completed
IT being dispatched : closing by end of June
To be presented at FC of September
Delivery by end 2017
Cavity Mechanics
Design and construction documentation completed
Production starting 2nd half 2016
Staged delivery during 2017
Integration, cabling, cooling est.
Cables requested
Cooling needs defined
Integration in process

13. LIU-PS Implementation Plan
10 MHz System Upgrade
No major purchase expected
Consolidation of HV power supplies (1971)
Can be managed in the section with EPC support.
Water cooling and power required in test stand at building 359 during part of LS2
Water cooling and power required in the PS as from January 202
80 MHz Fast Tuner
Relevant test on one 80 MHz system during EYETS
Some design required for the final RF feedthrough
6 months delivery expected for the ceramics of the RF feedthrough
Solenoid delivery unknown, for the moment
Rest of components can be off the shelf
PS Kicker System
Design a new shielding for the amplifiers
Implement new solid state amplifiers (PSB design)
Review the present cabling and patch panel
40/80 MHz Fast Feedback Upgrade
The study must demonstrate the advantage of implementing this upgrade
A new feedback architecture has to be defined
New driving amplifiers, probably
BE/RF-IS Contribution to LIU C. Rossi 31st May 2016

14. Implementation Plan
Finemet Activities
LIU-PS Activities

15. Status of Contributions from IS Section
PSB Finemet RF System
One system tested (10 gaps) with all operational beams and all harmonics, IT being sent for all critical components
10 MHz Upgrade
Prototype system tested with all operational beams
40/80 MHz Fast Feedback Upgrade
Some preliminary measurements performed, no decision yet
Fast Ferrite Tuner for the 80 MHz cavities
Prototype device tested at low level on an 88 MHz cavity
PS Kicker System
Advanced prototype successfully tested with different beam conditions
BE/RF-IS Contribution to LIU C. Rossi 31st May 2016

16. PLAN Overview
The 40/80 MHz Feedback Upgrade is the only activity that has not been declared into PLAN, because of the uncertainty still pending on its feasibility.
BE/RF-IS Contribution to LIU C. Rossi 31st May 2016

17. Conclusions
The main IS contributions to LIU (PSB Finemet, 10 MHz Upgrade, PS Kicker) are well on their way.
The feasibility of the 80 MHz Fast Tuner and of the 40/80 MHz Feedback Upgrade is still under investigation; costs and benefits will need to be considered as soon as the technical frame has been clarified.
A correct implementation of the IS contribution requires the availability of the infrastructure and support at due time.
PSB PS