Dayle Kotturi Lehman Review [email protected] May 10-12, 2005 Low Level RF Outline Scope Local feedback loop requirements Solutions Costs How this

Dayle Kotturi

Lehman Review [email protected]

May 10-12, 2005

Low Level RF

OutlineScope

Local feedback loop requirements

Solutions

Costs

How this fits into global feedback

Other signals

Conclusions

Dayle Kotturi


May 10-12, 2005

ScopeThe low level RF controls system consists of RF phase and amplitude controls at these locations:

LaserGunL0-A (a.k.a. L0-1)L0-B (a.k.a. L0-2)L0 Transverse cavityL1-SL1-XL2 – using 2 klystrons to control avg phase/ampl of L2L3 Transverse cavityL3 - here is a bit different (lots of klystrons!)

Dayle Kotturi


May 10-12, 2005

Local feedback loop requirements

At each of these locations, the klystron’s phase and amplitude will be controlled

Inputs are listed in Appendix A

Example inputs (for the gun) are:Cell 1 RF monitor. ½” heliax. Phas/ampl 5us 120 Hz

Cell 2 RF monitor ½” heliax. Phas/ampl 5us 120 Hz

RF in FOR. ½” heliax. Phas/ampl 5us 120 Hz

Dayle Kotturi


May 10-12, 2005

Off-the-shelf solution

PAD

Solution 1: Multiple VME crates with COTS modules.

CPU

ADC

fast

ADC

fast

DAC slow

Fast, but no FPGA

Thermocouple system

DAC

fast

EVR

VME Crate

CPU

Global longitudinal beam-based

feedback VME crate

1 trigger for 4 channels of 1k

samples

laser

L0-AL0-B

L1-SL1-XT Cav

gun

Beam-based longitudinal fast feedback gigabit

ethernet

Controls gigabit ethernet (interface to MCC)

RF Reference/4 = 119 MHzstabilized to 50 fs jitter

476 M

Hz R

F Refe

rence

cloc

k dist

ribute

d to a

ll 30 s

ector

s in t

he Li

nac a

nd be

yond

RF Reference*6 = 2856 MHzstabilized to 50 fs jitter

L2: in sector 24, there are 3 stations to adjust in order to accurately control phase and amplitude for long, beam-based fast feedback

10' accelerator

IQ Modulator: a phase shifter

and an attenuator

1 kW 1 kW

100 mW

ADC

slow


Solid State Sub Booster

Klystron

SLED cavity

laser RF

For waveforms e.g. reflected power, beam

voltage

1 trigger to travel up to ½ sector

away

60 MW

HPRF240 MW

60 MW

1 kW

RF Phase and Amplitude correction at 120 Hz for:laser, gun, L0-A, L0-B, L1-S, L1-X, T cav, L2 and S25 Tcav

Slow adjustments to allow rotation

of the reference

phase(inc sensitivity,

dec noise)

All except laser RF

100 mW

119 MHz Laser

Oscillator

Amps

GunNB: For the gun, SLED

cavity is shorted out

119 MHz120 Hz

UV

photodiode

photodiode

Sector 25 T Cav (new 4/2005)

Dayle Kotturi


May 10-12, 2005

Off-the-shelf solution

Test/measure digitizer performance: when clock increases from 105 MHz to 119 MHz, are bits lost?Talking to vendors re: arbitrary function generator (ensure noise < 0.1% ) for pulse shaping with carrier boardDefine interface to PAD Adapt available driver and device support for digitizer to RTEMS

Dayle Kotturi


May 10-12, 2005

In-house solution

I and Q Demo-dulator

CPU

FIFOs

ADC

slow

DAC

slow

Thermocouple system

EVR

VME Crate

CPU

laser

L0-AL0-B

L1-SL1-XT Cav

gun

Beam-based longitudinal

fast feedback gigabit

ethernet


Eth recvr

Private ethernet8 kBytes at 120 Hz

PAD

ADC

I and Q Modulator

DAC

FIFOs

1 trigger for 4

channels of 1k

samples

Private ethernet4 kBytes at 120 Hz

Solution 2: Multiple VME crates with in-house modules

476 M

Hz R

F Refe

rence

cloc

k dist

ribute

d to a

ll 30 s

ector

s in t

he Li

nac a

nd be

yond



Controller with

ethernet

Controller with

ethernet

Local trigger

Possibly combined into one module

Slow adjustments to allow rotation of the

reference phase

ADC

fast

Other waveformsFast, but not 119

MHz. 59.5 MHz ok


feedback VME crate

L2: in sector 24, there are 3 stations to adjust in order to accurately control phase and amplitude for long, beam-based fast feedback

PAC

Sector 25 T Cav (new 4/2005)

RF Phase and Amplitude correction at 120 Hz for:laser, gun, L0-A, L0-B, L1-S, L1-X, T cav, L2 and S25 Tcav

10' accelerator

IQ Modulator: a phase shifter

and an attenuator

1 kW 1 kW

100 mW

Solid State Sub Booster

Klystron

SLED cavity

60 MW

HPRF240 MW

60 MW

1 kW

All except laser RF

100 mW

119 MHz Laser

Oscillator

Amps

GunNB: For the gun, SLED

cavity is shorted out

119 MHz120 Hz

UV

photodiode

photodiode

1 trigger to travel up to ½ sector

away

Dayle Kotturi


May 10-12, 2005

In-house solution: alternate choice

Requires development of FPGA-based board with ethernet

On-board processing capability for local feedback

Places the digitizers next to the low noise RF components (eliminates transmission of low noise analog signals outside the chassis)

Dayle Kotturi


May 10-12, 2005

L3 solution

CPU

DAC (slow)Updates

@120 Hz;stable 20 µs before

beam arrives and able to distinguish beamcodes

CPU


feedback VME crate

IQ Modulator (driving sub-

booster klystron in sectors 29)

RF Phase and Amplitude correction at 120 Hz for: L3

Beam-based longitudinal fast feedback gigabit

ethernet


476

MHz

RF

Refe

renc

e clo

ck d

istrib

uted

to a

ll 30

secto

rs in

the

Linac

and

bey

ond

500 W

IQ Modulator (driving sub-

booster klystron in sectors 30)

klystron

10' accelerator

1 kW 60 MW

HPRF240 MW

60 MW

SLED cavity

500 W

klystron

10' accelerator

1 kW60 MW

HPRF240 MW

60 MW

SLED cavity

Sub Booster Klystron Sub Booster Klystron

100 mW 100 mW



1 kW1 kW

8 copies8 copies

Dayle Kotturi


May 10-12, 2005

CostsIn operation, 9 instances of

VME chassis: 6000 €PowerPC: 5000 USDFast digitizer: 5000 USDFast DAC module in carrier board: $unknownAdditional digitizer for waveforms: ~3000KAnalog module for temperatures: ~2000K

And 1 instance (of same) for testing/spares

At L3, 1 instance ofVME chassis: 6000 €PowerPC: 5000 USDAdditional digitizer for waveforms: ~3000KAnalog module for temperatures: ~2000K

Dayle Kotturi


May 10-12, 2005


TOROID

BUNCH CHARGE

BEAM PHASE CAVITY

GUN RF FEEDBACK

InputsGUN-CELL1-PHAS/AMPLGUN-CELL2-PHAS/AMPL

ActuatorsGUN RF ACTUATORS

2856MHz R ef

GUN RF ACTUATORS

LCLS RF Oscillator

LINAC MDL Ref.

PHAS

GUN RF REF.

LASER RF R EF.

PHAS AMPL

PHASEERROR

ActuatorL0, L1 to L2, L3Phase

AMPL

GUN-CELL2

GUN-CELL1

KLYSTRONAMPLIFIER / SLC CONTROL

LASER OSC

Reference

LASER OSC. PHASE

WATER TEMP

RF GUN

LASER PHASE ACTUATOR

LASER POWERACTUATOR

OUT

GUN TUNE FEEDBACK

InputsGUN-FOR-PHASGUN-CELL1-PHASGUN-CELL2-PHAS

ActuatorsWATER TEMP

GUN-FOR

LASER OSCILLATOR PHASEand LASER POWERFEEDBACK

InputsLASER OSC. PHASEBUNCH CHARGEGUN-CELL1-AMPL/PHASGUN-CELL2-AMPL/PHASLASER PHASE & AMPLITUDEGUN RF ACTUATORSBEAM PHASE CAVITY

ActuatorsLASER POWERLASER PHASE ACTUATOR

PHASE ERROR BetweenL0, L1 and L 2, L3

2856MHzRF REF.

LASER

GUN

L0A

L0B

L0-TCAV1

L1-X

L1-S

LASER PHASE & AMPLITUDE?

LASER AMPLIFIER

Dayle Kotturi


May 10-12, 2005


L0B LOAD FOR

PHAS

L0B RF REF.

AMPL

L0 BUNCH ENERGYFEEDBACK

Inputs4 DL1BPMs: BPM10,11,12,13Laser phase, power

Matrixed Information DL1 Energy

Status inputs Flags for what is broken

ActuatorsL0 AMPLITUDE

L0A RF PHAS/AMPL0B RF PHAS/AMP

One value lets you control one parameter (L0 amplitude)

DL1 BPM 13X Position

L0B RF ACTUATORS

L0B

L0B THREET HERMOCOUPLEINPUTS





L0A R F REF.

L0A

L0B RF Feedback

InputsL0B-FOR PHAS/AMPLL0B-LOAD FOR PHAS/AMPL3-THERMOCOUPLES

ActuatorsL0B RF PHAS/AMPL

L0B-FOR


L0A-FOR

L0A LOAD FOR

L0A T HREETHERMOCOUPLE INPUTS

L0A R F Feedback

InputsL0A-FOR PHAS/AMPLL0A-LOAD FOR PHAS/AMPL3-THERMOCOUPLES

ActuatorsL0A R F PHAS/AMPL

AMPLPHAS

L0A RF ACTUATORS

Dayle Kotturi


May 10-12, 2005


L1D THREET HERMOCOUPLEINPUTS

L1X-FOR

L1X T HREE THERMOCOUPLEINPUTS

PHAS AMPL

L1 RF ACTUATORS

L1 RF REF.

L1 BUNCH ENERGY/LENGTHFEEDBACK

Inputs4 DL1BPMs: BPM10,11,12,133 BC1BPMs: BPMA12,BPMS11,

BPMM12Toroid atBC1: IMBC1OBLM atBC1: BLM11 Laser phase, power

Matrixed Information DL1 EnergyBC1 Energy and Bunch Length


ActuatorsL1 RF PHASL1 RF AMPL

L1C THREET HERMOCOUPLEINPUTSL1B THREET HERMOCOUPLEINPUTS

L1X R F Feedback

InputsL1X-FOR PHAS/AMPLL1X-LOAD FOR PHAS/AMPL3-THERMOCOUPLES

ActuatorsL1X R F PHAS/AMPL



L1X RF ACTUATORS

AMPLPHAS

L1X R F REF.

L1B-FOR

L1C LOAD FORL1C

L1XL1X LOAD FOR

L1S R F Feedback

InputsL1B-FOR PHAS/AMPLL1B-LOAD FOR PHAS/AMPLL1C-LOAD FOR PHAS/AMPLL1D-LOAD FOR PHAS/AMPLL1B 3 THERMOCOUPLESL1C 3 THERMOCOUPLESL1D 3 THERMOCOUPLES

ActuatorsL1 RF PHAS/AMPL

L1D LOAD FOR

BC1 BPMM12X Position

BC1 BPMS11X Position

BC1 BPMA12X Position

L1D

BC1BUNCHLENGTHL1B LOAD FOR

L1B

Dayle Kotturi


May 10-12, 2005


L2 24-1

L2 24-1 RF ACTUATORS

PRL RF

PHAS AMPL


L2 24-2 RF ACTUATORS

L2 24-2


AMPLPHAS

PRL RF

L2 BUNCH ENERGY/LENGTHFEEDBACK


BPMM123 BC2BPMs: BPM24401,

BPM24701,BPMS21Toroid atBC1: IMBC1OToroid atBC2: IMBC2OBLM atBC1: BLM11 BLM atBC2: BLM21Laser phase, power

Matrixed Information DL1 EnergyBC1 Energy and Bunch Length BC2 Energy and Bunch Length


ActuatorsL2 PHASE AND AMPLITUDE

L2 24-1 R FPHAS ACTUATORL2 24-2 R FPHAS ACTUATOR

BC2 BPM24401X Position

BC2 BPM24701X Position

BC2 BPMS21X Position

BC2 BUNCHLENGTH

Dayle Kotturi


May 10-12, 2005


DL2 BPMDL3X Position

PRL RF

8 KLYSTRONAMPLIFIER / SLC CONTROL

SECTOR 28SECTOR 27 DL2 BPMDL1X Position

8 KLYSTRONAMPLIFIER / SLC CONTROL

SECTOR 27 PHASE ACTUATOR

PRL RF

L3 BUNCH ENERGYFEEDBACK


BPMM123 BC2BPMs: BPM24401,

BPM24701,BPMS212 DL2BPMs: BPMDL1,BPMDL3Toroid atBC1: IMBC1OToroid atBC2: IMBC2OBLM atBC1: BLM11 BLM atBC2: BLM21Laser phase, power

Matrixed Information DL1 EnergyBC1 Energy and Bunch Length BC2 Energy and Bunch LengthDL2 Energy


ActuatorsL3 AMPLITUDE

SECTOR 29PHAS ACTUATORSECTOR 30PHAS ACTUATOR

SECTOR 28PHASE ACTUATOR

Dayle Kotturi


May 10-12, 2005


L3 RF phase*L3 RF amplitude*

L2 RF phase*L2 RF amplitude*

BC-2 energyBC-2 bunch length

LIST OF AVAILABLE PARAMETERSupdated at 120 Hz unless specified otherwise

Laser phaseLaser powerGun RF phaseGun RF amplitudeGun chargeBeam phaseL0A RF phaseL0A RF amplitudeL0B RF phaseL0B RF amplitudeDL1 energyL1 RF phaseL1 RF amplitudeL1-X RF phaseL1-X RF amplitudeBC-1 energyBC-1 bunch length

DL2 energy

*Discussion needed here: - these 10 sectors*8 klystron values are available from the SCP, but maybe impossible to read them@ 120 Hz. Alternatively, we could provide the corrected values @120 Hz.

Dayle Kotturi


May 10-12, 2005

Other signals – (listed in Appendix A)

Control signalsThis is the feedback’s calculated new phase/amplitude

Need pulse shaping

Pulse shaping would be entered manually

Don’t know where yet

Very low processing load

Dayle Kotturi


May 10-12, 2005

Conclusions

By using multiple VME chassis (10 over injector, sectors 24 & 30), the LCLS LLRF raw signals can be processed by the CPU in time to send out phase and amplitude corrections and have them settle within a beam pulse.

When there is beam, this system will integrate with the beam-based longitudinal feedback by accepting the latter’s RF phase and amplitude corrections and passing them on.

Dayle Kotturi


May 10-12, 2005

Appendix ARF Cables - Monitor and Control Signals – from LCLS ESD 1.2-137 (Akre, Hill)Legend: Monitor. Feedback. Control.

From RF HUT

Sub-system Signal Name Cable Type To Location Signal Type

Laser RF Reference 1/2" Heliax Laser Room Phas/Ampl CW

Laser Oscillator Out 1/2" Heliax Laser Room Phas/Ampl CW

120Hz Laser Pulse 1/2" Heliax Laser Room Phas/Ampl picoSec

RF Control RF Hut Phas/Ampl CW

Gun Cell 1 RF Monitor 1/2" Heliax Gun Phas/Ampl 5uS 120Hz

Cell 2 RF Monitor 1/2" Heliax Gun Phas/Ampl 5uS 120Hz

RF In FOR 1/2" Heliax Gun Phas/Ampl 5uS 120Hz

RF In REFL 1/2" Heliax Gun Phas/Ampl 5uS 120Hz

RF Control 1/2" Heliax 20-6 120Hz

Dayle Kotturi


May 10-12, 2005

Appendix A continuedL0-A RF In FOR 1/2" Heliax L0-1 Phas/Ampl 5uS 120Hz

RF In REFL 1/2" Heliax L0-1 Phas/Ampl 5uS 120Hz Load FOR 1/2" Heliax L0-1 Phas/Ampl 5uS 120Hz Load REFL 1/2" Heliax L0-1 Phas/Ampl 5uS 120Hz


L0-B RF In FOR 1/2" Heliax L0-2 Phas/Ampl 5uS 120Hz RF In REFL 1/2" Heliax L0-2 Phas/Ampl 5uS 120Hz Load FOR 1/2" Heliax L0-2 Phas/Ampl 5uS 120Hz Load REFL 1/2" Heliax L0-2 Phas/Ampl 5uS 120Hz RF Control 1/2" Heliax 20-8 120Hz

Dayle Kotturi


May 10-12, 2005

Appendix A continuedL0- Transverse

RF In FOR 1/2" Heliax L0- Transverse Phas/Ampl 5uS 120Hz

RF In REFL 1/2" Heliax L0- Transverse Phas/Ampl 5uS 120Hz

Load FOR 1/2" Heliax L0- Transverse Phas/Ampl 5uS 120Hz

Load REFL 1/2" Heliax L0- Transverse Phas/Ampl 5uS 120Hz


L1-S SLED Out FOR 1/2" Heliax 21-1

SLED Out REFL 1/2" Heliax 21-1

ACC A/B In FOR 1/2" Heliax 21-1 Phas/Ampl 5uS 120Hz

ACC A/B In REFL 1/2" Heliax 21-1 Phas/Ampl 5uS 120Hz

ACC C IN FOR 1/2" Heliax 21-1 Phas/Ampl 5uS 120Hz

ACC C IN REFL 1/2" Heliax 21-1 Phas/Ampl 5uS 120Hz

Load A/B FOR 1/2" Heliax 21-1 Phas/Ampl 5uS 120Hz

Load A/B REFL 1/2" Heliax 21-1 Phas/Ampl 5uS 120Hz

Load C FOR 1/2" Heliax 21-1 Phas/Ampl 5uS 120Hz

Load C REFL 1/2" Heliax 21-1 Phas/Ampl 5uS 120Hz


Dayle Kotturi


May 10-12, 2005

Appendix A continuedL1-X

KLY Out RF FOR 3/8" Heliax 21-2 Phas/Ampl 2uS 120Hz

KLY Out RF REFL 3/8" Heliax 21-2 Phas/Ampl 2uS 120Hz

ACC In FOR 3/8" Heliax 21-2 Phas/Ampl 2uS 120Hz

ACC In REFL 3/8" Heliax 21-2 Phas/Ampl 2uS 120Hz

Load FOR 3/8" Heliax 21-2 Phas/Ampl 2uS 120Hz

Load REFL 3/8" Heliax 21-2 Phas/Ampl 2uS 120Hz

FB Control 3/8" Heliax 21-2 120Hz

L3-Transverse

RF In FOR 1/2" Heliax 25-5A Phas/Ampl 5uS 120Hz

RF In REFL 1/2" Heliax 25-5A Phas/Ampl 5uS 120Hz

Load FOR 1/2" Heliax 25-5A Phas/Ampl 5uS 120Hz

Load REFL 1/2" Heliax 25-5A Phas/Ampl 5uS 120Hz


Documents

Dayle Kotturi Lehman Review [email protected] May 10-12, 2005 Low Level RF Outline Scope Local feedback loop requirements Solutions Costs How this