Booster Low Level Modules, Timing and some Measurements.

Slides:



Advertisements
Similar presentations
01/11/2002SNS Software Final Design Review1 V123S Event Link Encoder, Transmission System and PLL Receiver Thomas M. Kerner (BNL) SNS Global Controls.
Advertisements

COMMUNICATION SYSTEM EEEB453 Chapter 3 (III) ANGLE MODULATION
Booster Cogging Robert Zwaska Fermilab (University of Texas at Austin) Accelerator Physics & Technology Seminar Dec. 8, 2005.
Chapter 9 High Speed Clock Management. Agenda Inside the DCM Inside the DFS Jitter Inside the V5 PLL.
Project 3 Build an Astable Multivibrator
Proton Source Workshop December 7 & 8, 2010 John Reid December 8, 2010.
Punjab EDUSAT Society (PES) Contact info: Phone: Oct,
Pulse Width Modulation (PWM) LED Dimmer Circuit
NOvA meeting PIP Update W. Pellico. PIP Goals and Scope (Provided in 2011 – Directorate S. H. / DOE Talk ) Goals: Specific to the issues surrounding the.
Ayman Khattab Mohamed Saleh Mostafa El-Khouly Tarek El-Rifai
Proton beams for the East Area The beams and their slow extraction By : Rende Steerenberg PS/OP.
LLRF System for Pulsed Linacs (modeling, simulation, design and implementation) Hooman Hassanzadegan ESS, Beam Instrumentation Group 1.
DLS Digital Controller Tony Dobbing Head of Power Supplies Group.
F MI High Power Operation and Future Plans Ioanis Kourbanis (presented by Bruce Brown) HB2008 August 25, 2008.
Booster Cogging Upgrades Craig Drennan, Kiyomi Seiya, Alex Waller.
Digital Signal Processing and Generation for a DC Current Transformer for Particle Accelerators Silvia Zorzetti.
INTRODUCTION  RECYCLER BPM – Original system not adequate to measure beam position precisely. It is being upgraded to meet the required physics precision.
RF Cavity Simulation for SPL Simulink Model for HP-SPL Extension to LINAC4 at CERN from RF Point of View Acknowledgement: CEA team, in particular O. Piquet.
LLRF Cavity Simulation for SPL
Horz V1 H1 H2 V2 Pbars in Recycler Ring Stripline Kickers Split Plate Pickups A-B Vertical Digital Damper Vert Recycler Transverse Damper System Similar.
AAC February 4-6, 2003 Protons on Target Ioanis Kourbanis MI/Beams.
LLRF-05 Oct.10,20051 Digital LLRF feedback control system for the J-PARC linac Shin MICHIZONO KEK, High Energy Accelerator Research Organization (JAPAN)
Debuncher “phase jump” project Decouple Debuncher RF frequency from MI 120 GeV frequency – MHz could move by ~1-2 kHz –Can center beam in Debuncher.
Challenges of Dual Harmonic RF Systems ISIS Synchrotron Group John Thomason.
Booster Cogging Bob Zwaska University of Texas at Austin Bill Pellico FNAL.
Timing Requirements for Spallation Neutron Sources Timing system clock synchronized to the storage ring’s revolution frequency. –LANSCE: MHz.
Summary of Booster Dampers Systems Dave McGinnis December 7, 2010.
The ISIS Dual Harmonic Upgrade The Council for the Central Laboratory of the Research Councils Andy Seville Joint Accelerator WorkshopMarch 28th, 2006.
April 16, 2009Craig Drennan, AD/Proton Source/Booster1 Upgrading Electronics for the LLRF Electronics Design Efforts Craig Drennan, April 16,2009.
Lecture 25 - E. Wilson - 12/15/ Slide 1 Lecture 6 ACCELERATOR PHYSICS HT E. J. N. Wilson
Beam Line BPM Filter Module Nathan Eddy May 31, 2005.
Present Uses of the Fermilab Digital Signal Receiver VXI Module Brian Chase,Paul Joireman, Philip Varghese RF Embedded Systems (LLRF) Group.
MI primer for NuMI users  Getting beam  TLG modules  Timelines  Beam intensity  NuMI kickers  Extraction bumps and last turn positions  Batch positions.
14 th ESLS RF Meeting – Trieste, September 2010 ALBA RF Status 1/28 ALBA RF Status Francis Perez.
BIC Issues Alan Fisher PEP-II Run-4 Post-Mortem Workshop 2004 August 4–5.
BEPC II TIMING SYSTEM EPICS Seminar Presented by Ma zhenhan IHEP 20.August 2002.
Bunch by bunch feedback systems for KEKB Makoto Tobiyama KEK Accelerator Laboratory.
R.SREEDHARAN  SOLEIL main parameters  Booster and storage ring low level RF system  New digital Booster LLRF system under development  Digital LLRF.
Early Beam Injection in the Fermilab Booster & its Implementation Plan Chandra Bhat Todd’s Operation Meeting /12/2015 Chandra Bhat Abstract:
Booster Losses Keith Gollwitzer PIP and MI 700 kW review January 2015.
Proton Source Improvement Workshop Cogging W. Pellico Dec 6&
Other Utilities of ALBA LLRF
High Intensity Booster Operations William Pellico PIP II collaboration Nov. 9 th 2015.
Bunch Numbering P. Baudrenghien AB/RF for the LHC/RF team.
SPS 200 MHz LLRF upgrade Part 2: Implementation Philippe Baudrenghien, Grégoire Hagmann,
1 Neutron Monitor Workshop 2(A): Principles of Digital Logic Mahidol University June 25, 2009 Paul Evenson University of Delaware Bartol Research Institute.
Digital LLRF: ALBA and Max-IV cases RF&Linac Section - ALBA Accelerators Division Angela Salom.
Beam time structures 1 At any particular instance of time there will be only one kind of beam in the MI. It will be either protons or anti-protons. The.
Managed by UT-Battelle for the Department of Energy Vector Control Algorithm for Efficient Fan-out RF Power Distribution Yoon W. Kang SNS/ORNL Fifth CW.
PIP Update May 28 th Agenda Summary Update – Current Activities/Updates – Ken Domann.
EtherCAT based RF Interlock System for SwissFEL LLRF 2015 Abstract As part of the overall development effort for SwissFEL's RF and LLRF systems, the RF.
RTL Hardware Design by P. Chu Chapter 9 – ECE420 (CSUN) Mirzaei 1 Sequential Circuit Design: Practice Shahnam Mirzaei, PhD Spring 2016 California State.
LFB, LLRF, TFB Alessandro Drago Annecy, March 2010.
Summary of ions measurements in 2015 and priorities for 2016 studies E. Shaposhnikova 3/02/2016 Based on input from H. Bartosik, T. Bohl, B. Goddard, V.
RF Commissioning D. Jacquet and M. Gruwé. November 8 th 2007D. Jacquet and M. Gruwé2 RF systems in a few words (I) A transverse dampers system ACCELERATING.
CarterFest 14 th July 2010 Stabilised Magnetrons Presentation to mark Professor Richard Carter’s contributions to Vacuum Electronics Delivered by Amos.
High Power RF Systems for 2-8 GeV Fast Cycling Synchrotron PROJECT X (ICD-2) John Reid September 11, 2009.
Craig Drennan Update on Efforts to Develop New MI Phase Lock Controls PIP Management Meeting March 28, 2012.
RF acceleration and transverse damper systems
Challenges of Dual Harmonic RF Systems
The ISIS Dual Harmonic Upgrade
Optical PLL for homodyne detection
ISIS Synchrotron RF – Recent Work
RF and Sequences Andy Butterworth BE/RF
PSB Injection scheme in the Linac 4 era
Project 3 Build an Astable Multivibrator
Intra-Pulse Beam-Beam Scans at the NLC IP
Project 3 Build an Astable Multivibrator
Beam dynamics requirements after LS2
Lecture 6 ACCELERATOR PHYSICS HT E. J. N. Wilson
Presentation transcript:

Booster Low Level Modules, Timing and some Measurements

Questions Questions and/or Points of Interest with respect to Booster LLRF 1) System overview – What are the basic building blocks? (functional description) 2) How is phase jump at transition implemented? 3) What distinct modules are involved? 4) What is the response (low level and high level) to a request for a sudden change of phase – ROFF, RFSUM change, transition phase jump, etc.? 5) What limits a change of phase under sudden voltage reduction to 90o or less? How precise is the limit? 6) What determines the time constant for a change of phase as seen in the high level? 7) Is there any low level control of the slew rate? 8) Do you have any ideas about why the synchronous phase appears to approach 170deg just after the transition phase jump when the intensity is high? 10) Is there a current comprehensive drawing of the low level system? 11) Are the block labels readable in a printed version?

Things not discussed Cogging Snyc. Transfer between Booster and MI Bunch Rotation Various Timing Modules Not much on Booster to Mi phase lock –Craig will discuss upgrades

Injection and Capture modules and parameters Acceleration and Cogging modules and parameters Extraction modules and parameters Three parts to Booster RF cycle

Injection and Capture Modules CAMAC 071: generates Paraphase Curve Nim Sum Mod : Adds DC offsets to PP curve Paraphase Turn-on Mod : Shifts the Vector phase of ‘A’ and ‘B’ stations B:TPPP : Triggers 071 Paraphase curve B:VFIDR : Injection Frequency Decrement B:PPOFF : Injection DC level Paraphase offset B:RFBLON : RF Station ‘A’ and ‘B’ Balancer enable B:RFBLOF : RF Station ‘A’ and ‘B’ Balancer disable

Paraphase Curve

Beam Capture The paraphase curve takes about 600 us. The beam gate generator box uses an AM detected signal to produce a logic high beam gate. The generation of the beam gate valid will depend upon intensity and paraphase timing relative to injection timing. The beam gate signal enables the feedback.

Injection Timing 1)RFSUM 2)CHG0 3)Phase Error 4)Beam Gate

Paraphase Turn-on and Sum Box Bandwidth The response of the paraphase turn-on module is limited by a multiplier chip. It was required only to be as fast as required by the paraphase CAMAC 071 curve and the transition jump curves. The requirement at transition is a curve that swings 20 volts in 20 us. The sum box bandwidth is about 1 MHz.

Acceleration and Cogging The Frequency sweeps from 37.7 to MHz The bias and frequency programs start to play at BDOT level crossing. Feedback is enabled on valid cycles when Beam Gate appears. The low level VXI program is triggered on all $11, $12, $10. ( B:DDSCTG ) A revolution marker is reset with the chop on trigger. The marker is used to keep track of bunch # 1 and sampling. Cogging is planned to start after transition.

Acceleration/Cogging Feedback There are two acceleration feedback systems; radial position and phase feedback. A gap detector at long 18 provides the beam phase information. A resistive wall (BPM) at long ’18’ provides the position feedback. The cogging control of Booster will just be an offset to the radial position feedback.

VXI Phase Det. L18 pickup Wideband Gap Delay Phase Shifter Beam MI RF PGM Generator Paraphase Turn-on Module ‘A’‘B’ Trans. Trig Phase Shifter Controller Radial Position Det. (L6) RAG / ROF Curves Bdot Trans. Trig

Acceleration Phase Detector Type – Overlap Bandwidth - ~1MhZ Modified TEV Phase Detector Other types could work but would require phase adjustments Being Replaced with log det on VXI card.

RPOS Feedback Path Block Diagram Phase Shifter Drive Module Paraphase turn-on Module Phase Shifter Module BPM Mod ROFF RAG Bdot Aux 2 (AC RPOS Damper) Aux 1 input (Cogging Feedback) Transition Trigger RPERR PSDRIVE RF (from dist. Box ) “A”“B” Phase Matched AMPS Long 18 BPM BPM LO 28.8 MHz above RF ~ 1 MHz Bandwidth DDS

Phase Shifter Drive Feedback path for Radial Position Several Inputs: RPOS,ROF,RAG, BDOT,AC Damper,and Cogging Control Uses transition trigger to flip phase

Phase Shift Controller Module

Transition Timing Three modules are involved in transition: –Phase Shift Controller –Paraphase Turn-on Module –Paraphase Sum Box They all get a transition trigger which is an ‘or’ of all transition triggers. Question How do we get through transition with high beam current?

Answer the question first. At transition we have a situation where we’re current limited but need to drive a large reactive load. Tuners are not designed to be fast enough (they are slow compared to synchronous period) so the reactive componet needs to be handled by the tetrode. But since we’re running the stations at full voltage, there is not enough power (or current) to switch the reactive power. Like any filter, the rate at which the circuit cavity responds can be overdriven….if we had more current!

What we do know….what can we do? Mis-time transition – Why, because it gives beam a slight energy kick pre-transition. Quad Damper…but only works after transition so will not help reduce the bucket reduction at transiton. More Anode voltage at transition…no voltage available. More RF…means more available volts at transition. Slow down ramp…make GMPS work harder.

RF INPUT X r LO r XX rr X B A INJ Trans INJ Trans Analog Circuits Produce proper transition curves Trigger at Transition

Scope Picture 4.5E12 1)Phase Error 2)Phase Ctrl 3)RPERR 4)Paraphase Jump Ramp

Scope Picture 2.8E12

Scope Plots of Transition 4.5E12 1) DDS Phase Error 2)Phase CTRl Error 3) RPERR 4)Paraphase Turn-on Jump

VXI - LOW LEVEL RF This system replaced the VCO about 7 years ago. It also replaced the BPM frequency offset module. It generates the Bias, LO Frequency, BPM Frequency and phase lock Frequency trigger. We have two working modules and one that may be made to work. Plans are being made to replace this module.

VXI DDS Details It runs on a 25 MHz clock. An application program loads a two 1000 point curves ( Bias and Frequency.) The frequency curve is updated every 1 us. The Bias is updated every 4 us. The firmware is written in assembly code due to timing constraints. The biggest concern is that the DDS’s which operate at MHz are no longer made and we have no spares. Newer technology would allow more flexibility.

Response of Old VCO DDS has similar response

Extraction – Phase lock The phase lock process is enabled by a CAMAC timer B:BMIPLT. The VXI puts out a pulse when it reaches a frequency set by B:VPLFRQ. The pulse triggers a one-shot that begins the Booster to MI phase lock process. Extraction will occur about 2.8ms later. The error signal B:PLERR is the main diagnostic on the process.

Extraction PL Phase Detector This is a complex phase detection system A baseband error signal is compared against an op amp generated exponential curve Lots of pots to tune Timing is a challenge Large RPOS swing Less than +/-5deg. jitter Bunch Rotation also can occur at the end Being Upgraded

Questions ? Questions and/or Points of Interest with respect to Booster LLRF 1) System overview – What are the basic building blocks? (functional description) DONE 2) How is phase jump at transition implemented? DONE 3) What distinct modules are involved? DONE 4) What is the response (low level and high level) to a request for a sudden change of phase – ROFF, RFSUM change, transition phase jump, etc.? DONE 5) What limits a change of phase under sudden voltage reduction to 90deg or less? DONE 6) How precise is the limit? 7) What determines the time constant for a change of phase as seen in the high level? Done 8) Is there any low level control of the slew rate? Done 9) Do you have any ideas about why the synchronous phase appears to approach 170deg just after the transition phase jump when the intensity is high? YES 11) Is there a current comprehensive drawing of the low level system? YES 12) Are the block labels readable in a printed version? YES