by reza esfandiari, suli program mentor: carsten hast august 14, 2009
TRANSCRIPT
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?