next linear collider 8-pack project d. atkinson system review, april 3 the 8-pack project at nlcta...

Next Linear Next Linear ColliderCollider

8-Pack Project8-Pack Project

D. Atkinson System Review, April 3

The 8-Pack Project at NLCTAAn overview of the status and schedule for the project.

Modulator and klystrons startup in July, 2002High power checkout in January, 2003DLDS operation in July 2004

Phase 1 SLED layout




The 8-Pack ProjectDemonstrate full NLC RF power & stored energy,

1st with SLED, Test DLDS components at full power prior to DLDS assembly

Then with DLDSDeliver full NLC RF power to NLCTA accelerating structures

• Phase-1: 4-Pack– Assemble system with:

• 2 XP3 klystrons to power the SLED, additional XP3 klystron(s) as available• A solid state modulator (from the ‘4-dog’)• SLED system• A simplified LLRF control system allowing SLED operation

– Produce NLC spec. power: 600 MW 400 ns • Benchmark as a power source for the NLC

– Test DLDS components at full power before installing

• Phase-2: 8-pack– Assemble 8 (total) XP3 klystrons with a (new) solid state modulator and

an NLC spec. LLRF control system – Attach DLDS system with two half arms reaching to two girders of high

gradient accelerating structures in NLCTA (from FNAL).




Goals – Phase 1

• Use multimoded SLED II pulse compression on 2 tubes to attain >600 MW, 400 ns (@ cross potent)

– meeting the NLC spec.

• Set up a station for high power tests of DLDS components & begin testing components

• Gain experience with 75 MW klystron operation

• Not to interfere with the High Gradient Structure Tests

klystrons

TE02

TE01

TE01

TE02

mode-preserving taper (TE02 cutoff at small end)

iris

Dual-Moded Pulse Compression System

mode mixer

cross potent

dual-mode directional coupler

load trees

reflective TE01 TE 02 mode converter / tuning plunger

jog-converter

dual-mode combiner

height taper

T/4

T/4

dual-mode-preserving taper

TE01

TE11or

TE01or

TE11(unSLEDed)

dual-mode splitter

bend -converter

circ-rect taper

E-plane bend

H-plane bend

TE11or

TE01(unSLEDed)

possible add-on




Goals – Phase 2

• Demonstrate DLDS pulse compression to attain NLC power specs. – 500 MW, 396 ns

(@ girder)– Power NLCTA girders

• Test DLDS system and high gradient structures to full energy (200J – 400J)

• Investigate operational, stability, maintenance issues associated with DLDS




Modulator

Solid State Modulator in the 4-dog Test Stand

Move to NLCTA 5/28

Stand and tank being designed and built by LLNL




KlystronsUnit #2 under test by

the SLAC klystron group.

Schedule:

Install #2:

7/19-7/25

Install #3:

8/21-8/27

XP3 PPM #275MW




Phase 1 schedule overview

Held system design review 2/22

75% of individual systems completed design reviews

Civil and infrastructure complete 6/5

Commission modulator at NLCTA 7/18

Klystron #2 power to loads 8/2

SLEDII system installation begins 10/1

Pump down SLEDII 1/22/03




Phase 2 schedule overview

Begin DLDS design during FY’02

High-power test DLDS components April-October 2003

Remaining klystron parts fabricated in FY’03

Install remainder of klystrons January-February 2004

DLDS system with controls installed June 2004

DLDS testing begins July 2004




8-pack project spending needs

in direct, FY’02 dollarsPhase 1:4-Pack and SLED

Phase 2:8-Pack and DLDS

System FY’02 FY’03 FY’04

System Eng. & Admin.

$510k $510k $515k

Infrastructure 730 220 75

Modulator 130 30 0

Klystrons 260 2310 975

RF distribution 1645 2290 1510

Controls & DAQ 930 1080 370

Total $4,205k $6,440k $3,440k

In FY’02, $2.4M spent by NLC for R&D in klystrons, modulators, and SLEDII/DLDS component development - hardware used in 8-Pack Phase 1.

In Phase 2 the 8-Pack project must pick this up and purchase remaining hardware, including 5 klystrons and DLDS system




No contingency in plan, either cost or schedule

In Phase 2, Project must purchase all remaining hardware

Klystrons fabrication pushed out of ’02 by budgetDLDS fabrication and testing

Must compete for SLAC services with PEP-II, SPEAR 3, LCLS, & NLC structures development

If we had more dollars, we couldOutsource more fabrication work to secure scheduleAccelerate parts for remaining klystron in FY’02Enhance the diagnostics in the control system in FY’02

Currently in the process of resource loading the schedule

Costs and tasks may shift when complete

Issues and Concerns for the 8-Pack Project (Remember, this is an R&D project)

next linear collider 8-pack project d. atkinson system review, april 3 the 8-pack project at nlcta...

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