by Reza Esfandiari, SULI ProgramMentor: Carsten Hast

August 14, 2009

OverviewFrom LHC to ILC31km long colliderCollide electrons and

positrons at the speed of light

1000 Klystrons will be used

Klystron powered by Marx Modulators at End Station B Testing Facility

Klystron Tank and Marx Modulator @ SLAC

The current Klystron (right) and Marx Modulator (in cage) Test Stand in End Station B

The 2nd Marx Modulator PrototypeClose

dimensions to the current Modulator.

About 5’ wide7’-4” highExpected to be

8-12 ft long

What we’re doing @ SLAC- Marx Modulators are part of

the next generation of modulators that will power the Klystrons for the ILC.

-Currently there are long term testing of several devices running for 1000s of hours

- More equipment are soon coming up for additional testing

- One option is to place them in the tunnel at End Station B

B-Target Room Tunnel

108’ long tunnel24’-8” high12’ wideTake special note

of the two ledges Cranes up top

Objectives1. Come up with a design that implements 4-5

Test Stations, meets the criteria set by management and researchers working at End Station B

2. Perform calculations needed for construction of the selected design

3. Apply calculations

But first…Need a complete set of

blueprints of the tunnelSLAC built in 1960s, no

CADs available thenRecently all blueprints

scanned onlineIt was my first task to

compile the scattered blueprints

BluePrint of End Station B Tunnel

Let the Designing and Planning BeginA lot of talking with researchers and

management and at the End Station BNotable Criteria:

Floor for storageA pipe to store RF wavesCalifornia Building CodeOSHA StandardsEasier Access to the top of the KlystronAnd many more

Looking at the Klystron again- Over 9’ high- Next version will

mainly make it not as long, but height stays more or less the same

- Workers want easier access

9’

4’

9’-6”

2’-6”

Two Main OptionsTwo Options that stood outOne was cheap and inefficient, Other was more expensive but

solved the problems at hand

The Not-So-Good OptionSimply stack everything side by side down

the tunnelWaist size regulation!!!

12’6’ 2’Marx Klystron

The Better Option- Picture of 1

Klystron in the tunnel

- Addresses most of the issues

- Meets OSHA and Cal Codes

Another LookCross-Sectional View

(Looking into the tunnel)Meets CalCode for

clearance to roof (4’ minimum)

Meets OSHA Standard which states that the stair need 40-60 degree incline

Workers happier!

7’-2”

5’-4”

45 degree

inclinde

And once more… A general look, though a lot are missing

Calculation TimeFirst need to decide overall load of what the

beams will holdEach Klystron has a weight of 3 ton(6000 lb)Weights change during Earthquakes

SLAC’s formula for Earthquake safety Load (1.5) x Dead Load + E [ where E is the horizontal seismic force] Total Load to work with = 9,455 lb

A lot of CalculationsEasy Stuff First

Center of Mass of the KlystronEstimate the Live and Dead LoadsMoment of InertiaBeam Reactions

maF

More fun times!Maximum Bending

Moment

Maximum Shear Force

Lateral Seismic Force

Overturning Moment

Stress at Load

Deflection

.Zl

Wab

resistinggoverturnin MMgOverTurnin

Eh QE

A

F

xI

My

Maximum Bending MomentBased on the

Moment Diagram, can see that the maximum bending moment is around 9000 lb.ft.

What to do with a result-Need a Beam to resist that moment-Manual of Steel Construction (big thanks to Richard’s Mentor)

And without further adieu

Example: A beam named W6x20 (which is 6” by 6”), can resist a bending moment of 27 Kip (which is 27,000 lbs.ft)[safety measures are good]

Do this for all parts of the construction for each weld, bolt, etc…

AcknowledgmentsThis project and opportunity was sponsored

by the U.S. Department of Energy. I would like to express my gratitude to my mentor, Carsten Hast, Steve Rock and all workers at NLCTA and ESB that made me feel welcome this summer.

Questions?