LLRF and Beam-based Longitudinal Feedback Readiness

Dayle Kotturi, Ron Akre

LCLS Week [email protected], [email protected] 26, 2005

LLRF and Beam-based Longitudinal Feedback ReadinessOutline

Overview of the system

December 2006 readiness requirements

Dependencies

Activities to get there – past/present/future

Conclusion



Overview of the systemThe low level RF controls system consists of RF phase and amplitude controls at these locations:

LaserGun (Klystron 20-6)L0-A, a.k.a. L0-1 (Klystron 20-7)L0-B, a.k.a. L0-2 (Klystron 20-8)L0 Transverse cavity (Klystron 20-5)L1-S (Klystron 21-1)L1-X (Klystron 21-2)L2 - (Klystrons 24-1,24-2,24-3) to control avg phase/ampl of L2L3 Transverse cavity (Klystron 24-8)L3 - 2 sectors of klystrons, S29+S30

The feedback system consists of a VME chassis connected to LLRF IOCs via private ethernet



Dec 2006 readiness requirements

RF phase and amplitude controls at these locations:

LaserGun (Klystron 20-6)L0-A, a.k.a. L0-1 (Klystron 20-7)L0-B, a.k.a. L0-2 (Klystron 20-8)L0 Transverse cavity (Klystron 20-5)L1-S (Klystron 21-1)

Longitudinal beam-based feedback controls as far as BC1



Dependencies

Use of current downtime to proceed with installation at LINAC Sector 0

RF hut readiness with racks, AC power, cables and water by July2006 (downtime)



Activities to get therepast/present/future

Five categories of hardware Low level RF chassis (in-house)

Monitor chassis (in-house with COTS timing)

Fast control chassis (in-house with COTS timing)

Slow control chassis (in-house)

Feedback control chassis (COTS products)



Low level RF chassis (in-house)What for? Low level RF distribution where EPICS is not requiredWhere? LINAC Sector 0, the RF hut and klystron stationsStatus now: 119, 476, 2856, 2830.5 MHz – 16 way distributions completeSteps to complete:

by Oct2005: PEP-II master phase shifter by Nov2005: IQPAU by Nov2005: 476 MHz master amplifier by Jan2006: LO chassis



RF DistributionM ain D rive L ine (M D L )4 7 6 M Hz R F3 6 0 Hz F id uc ia lF ro m S e c to r 0 (2 km )

RF HUT Coupler476MHz Ref.

M D L to L inac S e c to rs 2 1 to 3 0P E P and R e s e arc h Yard

LCLS Sector 20 RF Reference System

T IM IN G R F

1 1 9 M Hz 4 7 6 M HzO UT

T rac k/Ho ld1 2 0 Hz

T IM ING S YS T E MF ID O

L C L S M a s te r O s c .4 7 6 M Hz P L L4 7 6 M Hz w ith

3 6 0 Hz F id uc ia l

TR IG G E R S3 0 pS rms J itte r 1 1 9 M Hz

O UT

476MHz to 2856MHzMULTIPLIER

2856MHz2Watt Amplifier

2856MHz16 Way Distribution20dBm each

119MHz2W Amplifier

G unL 0 AL 0 BL 0 T C A VL 1 SL 1 XL IN A CE X P E R IM E N T S

1 1 9 M HzD ig itize r C lo c ks1 6 W ay D is trib utio n2 0 d B m e ac h

G unL 0 AL 0 BL 0 T C A VL 1 SL 1 X

2 8 3 0 .5 M H z L O1 6 W ay D is trib utio n2 0 d B m e ac h

2830.5MHz LO Gen2856MHz in119MHz in 2830.5MHz out

G unL 0 AL 0 BL 0 T C A VL 1 SL 1 X

2830.5MHz2Watt Amplifier

RF MONITOR

RF MONITOR

RF CONTROL

RF CONTROL

RF CONTROL

RF CONTROL

RF CONTROL

RF CONTROL

RF MONITOR

Phase Control

Phase Control

476MHz LO16 Way Distribution20dBm each

476MHz2Watt Amplifier

Phase Control

2 8 5 6 M HzL A S E R L O C KR e fe re nc e

Phase Control

P has e C o ntro l

Power Monitor

Power Monitor

1 1 9 M HzM o nito r

Power Monitor

PowerMonitor

L A S E R D io d eP has e No is eM e as ure m e nt

CHASSIS Needed to be Built

L A S E R D io d eO utp ut

L O P has e M o nito r

PhaseControl



476 MHz master amplifier

PEP-II master phase shifter



2830.5 to 2856MHz Divide by 16 Chassis

LLRF Phase Reference System



119 to 476MHz Divide by 16 Chassis

LLRF Phase Reference System



Eth recvr

EVR

VME Crate at S20

CPU

CPU

PAC

Gun

PADPADPAD

PAC

RF Dist’n

Laser

PAC

L0-B

PADPAD

PAC

L1-S

PADPAD

PACL0-Tcav

PADPAD

PACL0-A

PADPAD

PAC

PAD

PAD PAC

Beam Phase Monitor

PAD

December 2006 Commissioning Readiness

PACPAC

PAC

PAC

PAD

VME Crate for longitudinal,

beam-based feedback

Total number of Fast PACs: 6Total number of Slow PACs: 6

Total number of PADs: 15Total number of VME crates: 2



Monitor chassis (in-house with COTS timing)

What for? Local RF phase/amplitude monitoring

Where? Laser, gun, L0-A, L0-B, L1-S

Status now: Evaluating ADCs

Steps to complete: by Dec2005: evaluation of ADCs (1chan)

by Mar2006: board prototype (4 chan, thermo)

by May2006: final board

by Sep2006: chassis (15 dual channel)

by Oct2006: injector install



Fast control chassis (in-house with COTS timing)

What for? Local RF phase/amplitude control

Where? Laser, gun, L0-A, L0-B, L1-S

Status now: board design

Steps to complete: by Jan2006: board prototype

by Mar2006: final board

by Sep2006: chassis (6 single channel)

by end of 2006 downtime: injector install



Slow control chassis (in-house)

What for? Phase and amplitude control of the referenceWhere? Sector 20 RF hutStatus now: not startedSteps to complete:

by Feb2006: start design by Mar2006: board prototype by May2006: final board by Sep2006: chassis (6 single channel) by Nov2006: injector install



RF crate What for? Local feedback control and timing for RF systemsWhere? Sector 20 RF hutStatus now: testing EVRSteps to complete:

evaluate number of signals and processor load to determine number of crates design and write software test with simulation and later hardware during 2006 downtime: install



Feedback control crate (COTS products)

What for? beam-based longitudinal feedback

Where? At sector 20, in RF hut

Status now: software design

Steps to complete: purchase network switch module if IOC has insufficient ports

by Dec2006: software

by Dec2006: installation



Conclusion

The low level RF system and the global feedback system will be ready for commissioning by December 2006, based on the plan presented.

LLRF and Beam-based Longitudinal Feedback Readiness

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