SLAC Aerial ViewSLAC Aerial View

SLAC Timing System SpecificationsSLAC Timing System Specifications

Blue Book: (~1968)

- Resolution: 50 nSec

- Jitter: 15 nSec

- Main Trigger Line

Waveform:

+ / - 400 Volts

PEP – II: (~1998)

- Resolution: 2.1 nSec

- Jitter: 20 pSec

- NIM Level

Waveform:

0 to –0.7 V into 50 Ohms

Historical MCC Timing UnitsHistorical MCC Timing Units

Machine CycleMachine Cycle

1 / 360 Second = 2.78 mSec

Timing System EnclosureTiming System Enclosure

Waveforms: 476 MHz with FIDUCIALSWaveforms: 476 MHz with FIDUCIALS

LINACLINAC

PEP - 2PEP - 2

Waveforms: 119 MHz and NIM PulseWaveforms: 119 MHz and NIM Pulse

FIDO OutputFIDO Output

PDU OutputPDU Output

SLAC LandscapeSLAC Landscape

Trigger Generation, simplifiedTrigger Generation, simplified

Sector 0 Trigger Generation, oversimplifiedSector 0 Trigger Generation, oversimplified

Trigger Generation, simplifiedTrigger Generation, simplified

Area Three, Rack OneArea Three, Rack One

Area One, Rack One CAMACArea One, Rack One CAMAC

Trigger Distribution: Sector 0 and 1Trigger Distribution: Sector 0 and 1

AMPLIFIERAND SPLITTER

SECTOR 0FEEDBACK

FIDO

FIDO

119DISTRIBUTION

119DISTRIBUTION

476 MhzFROMMDL

COUPLER476 Mhz TO

DAMPING RING

119 Mhzto CIDVAULT

119 Mhzto SECTORS

0 and 1

Klystron GalleryKlystron Gallery

Trigger Distribution: Damping RingsTrigger Distribution: Damping Rings

476 Mhzfrom

S0 Alcove

FIDO

119DISTRIBUTION

119 Mhzto

North Ring

FIDO

119DISTRIBUTION

119 Mhzto

South Ring

476 Mhz

LINAC Rack, FrontLINAC Rack, Front

LINAC Rack, RearLINAC Rack, Rear

MDL Coupled OutputMDL Coupled Output

LINAC Timing Sector TENLINAC Timing Sector TEN

FIDO

PDU PDU PDU

SECTOR 10SUB-

BOOSTER

476 Mhz 476 Mhz

476 Mhz

119 Mhz

Li09 Cr 4 Li10 Cr 2 Li10 Cr 3

MDL Coupler

Splitter

LINAC Timing DiagnosticLINAC Timing Diagnostic

Fiber Optic XmtrFiber Optic Xmtr

Fiber Optic LinkFiber Optic Link

FIBER OPTICTRANSMITTER

FIBER OPTICRECEIVER

TOP of S-30 SUB-Booster

Bldg 407

AMPLIFIERand

SPLITTERNLCTA TERM

Bldg 062

476 MHz

476 MHz

Bldg 407

NLCTA Trigger DistributionNLCTA Trigger Distribution

NLCTA TriggersNLCTA Triggers

FIBER OPTICRECEIVER

AMPLIFIERand

SPLITTER

476 MhzDistribution

Bldg 407 Bldg 407

Bldg 062

FIDO

476 Mhz

476 Mhz

476 Mhz

RF REFERENCESYSTEM

119 MhzDistribution

PDU

PDU

PDU

TERM

NLCTA Beam LineNLCTA Beam Line

PEP – 2 Timing GenerationPEP – 2 Timing GenerationMAIN DRIVE LINE

PEP - 2CONTROL

LINEDIST

CHASSIS

PEP - 2MASTER

OSCILLATOR476 Mhz

PHASE LOCKAND

INJECTIONFIDUCIAL

DETECTOR

PEP 2 FIDUCIAL GENERATOR125-843

POWER ANDVOLTAGE

MONITORS

PEP – 2 Timing EquipmentPEP – 2 Timing Equipment

PEP – 2 Timing DistributionPEP – 2 Timing DistributionTPLD

REGION12

TPLDREGION

10

TPLDREGION

2

TPLDREGION

8

TPLDREGION

4

TPLDREGION

6

PEP - 2MASTER

OSCILLATOR

PEP - 2FIDUCIAL

GENERATOR

PEP – 2 KlystronsPEP – 2 Klystrons

SLC Timing DistributionSLC Timing Distribution

SECTOR 30MDL

DISTRIBUTION

S30 MAIN DRIVE LINE

FIDO 119 DIST476 Mhz 119 Mhz

119 DIST

119 DIST

Spltr

119 DIST PDU

PDU

119 DIST

119 DIST 119 DIST 119 DIST

119 MhzBldg 751Bldg 757Bldg 750

Bldg 669

Bldg 136

Bldg 725

476 Mhz

119 Mhz

Bldg 136 Trigger DistributionBldg 136 Trigger Distribution

119 MHz Propagation in SLC119 MHz Propagation in SLC

Sector 30 “Source”Sector 30 “Source”

Final FocusFinal Focus

Some Timing ModulesSome Timing Modules

• FIDO• PDU (SLC)• PDU (PEP – 2)• Simple Timing Buffer• VDU

• 476 MHz Distribution• 119 MHz Distribution• PEP – 2 Timing Phase

Lock and Distribution

FIDO UnitFIDO Unit

FIDO B. D.FIDO B. D.

476 Mhz Splitter FIDUCIALDETECTOR

8 nSecONE-SHOT

2.5 mSecLOCKOUT

DIVIDEBy 4

DIVIDEBy 4

BANDPASSFILTER

RESETINHIBIT

DRIVER

DRIVER

PDUOUTPUTS

PSUOUTPUTS

PDU – SLC StylePDU – SLC Style

119 Mhz

DifferentialECL Output

To CAMACUpper Timing

Backplane

CounterDetector

Register

FromCAMAC

GlueLogic

RE-USE

Sixteen channels per PDU;

One channel shown

LINAC Timed CrateLINAC Timed Crate

PDU, Backplane, and STBPDU, Backplane, and STB

CAMACUpper TimingBACKPLANE

16 Channels

Designer’s original module names. Refer to Proverbs 26:11, KJV

PDU STB119 MHz

Delay Output Generator Voltage Monitor Interval Timer

FrontPanel

LEMOConnectors

NIMLevel

Outputs

16Channels

PEP – 2 Timed CratePEP – 2 Timed Crate

Vernier Delay UnitVernier Delay Unit

476 Distribution Unit476 Distribution Unit

476 MHz Distribution B.D.476 MHz Distribution B.D.

476 Mhz Splitter

AMP Splitter

Splitter

476 MhzTo FIDOs

VariableAttenuator

AMP476 MhzTo FIDOs

FIDOs and 119 DistributionFIDOs and 119 Distribution

119 MHz Distribution B.D.119 MHz Distribution B.D.

119 Mhz Splitter

AMP

AMP

119 MhzTo PDUs

119 MhzTo Next

Distribution Unit

SplitterVariableAttenuator

VariableAttenuator

TPLD Chassis Front PanelTPLD Chassis Front Panel

Timing Phase Lock Distribution B.D.Timing Phase Lock Distribution B.D.

Graphic by E.L.CisnerosGraphic by E.L.Cisneros

TPLD SCP Diagnostics 1TPLD SCP Diagnostics 1

TPLD SCP Diagnostics 2TPLD SCP Diagnostics 2

Some Triggered DevicesSome Triggered Devices

• Kickers• Single Beam Dumper

Logic• Beam Position

Monitors

• Toroid Charge Monitors

• Trigger Gate and Synchronizer

Damping Ring Kicker TriggersDamping Ring Kicker Triggers

Single Beam Dumper Logic ModuleSingle Beam Dumper Logic Module

Toroid Charge Monitor B.D.Toroid Charge Monitor B.D.

TOROIDon Beam Line

Ch 11 Trig

Ch 12 Enable

RocksRocks

Some Common Timing ProblemsSome Common Timing Problems

• Jitter• FIDO – related

Failures• Connections

• Bucket Jump• Undocumented

modifications

280280