^Interaction PointEvents and Happenings

in the SLAC CommunityApril 1991, Vol. 2, No. 4

An antic Story: EGRET Released from Atlantis

NASA GETS HELP FROM SLACby Steve St. Lorant

WHAT IS THE CONNECTIONbetween an elegant white shorebird, a mythical continent hiddenbeneath the ocean waves, andSLAC? Plenty of photons is what,and thereon hangs a tale.

It started way back, when hydro-gen bubble chambers were state-of-the-art particle detectors, and RogerGearhart and Joe Murray, both ofEFD, among others developed theback-scattered laser beam for the 82-inch bubble chamber.

The years go by, and one daysomeone wants to measure the pho-ton flux and spectrum of pulsarsand of other heavenly bodies, andthe various interactions taking placebetween cosmic gas and the cosmicrays emitted by galaxies. You builda telescope for the job, a photon(gamma ray) telescope to be exact,and you plan to use the SLAC re-sources to calibrate it. That is exactlywhat Bob Hofstadter and BarrieHughes of Stanford's High EnergyPhysics Laboratory proposed forNASA to do. After a suitably ex-tended period of administrativegestation, a photon detector wasbuilt of sodium iodide crystals(which light up when they meet aphoton), surrounded by a complexarray of photomultipliers. One canonly surmise that the reason for acylindrical detector was simply toupstage an earlier SLAC detectorshaped like a sphere, the CrystalBall.

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I he space shuttle Atlantis and its crew or rive take oTf from me Cape canaveral on me irst snuttiemission of the year. The space telescope is stowed in the cargo bay.

The telescope was built, and ithad to be calibrated-and that iswhen SLAC truly entered the pic-ture. The monochromatic gammarays from Joe and Roger's gadget,tunable from 60 MeV to more than19 GeV were ideal for the purpose.NASA's team arrived with the tele-scope, beg your pardon, EGRET,complete with stunning logo andtrailers full of equipment of exquis-ite technical perfection. After aboutfour months of using SLAC's testbeam, the telescope (ironically

housed in an old bubble chamberbuilding) was duly calibrated pro-nounced flight ready (1986) andthen mothballed.

EGRET's day came in the morn-ing of April 5, 1991 at 9:23 ESTprecisely, and "only 5 minutes be-hind schedule," when in the hold ofSDS-17 the telescope finally lifted offthe pad and headed into space.EGRET was deployed on stationand EGRET rebelled. After all theseyears of comfort in air conditioned

(cont'd. on pg. 2)

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(EGRET cont'd from pg. 1)

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ton telescope was placed in orbit. It will scanthe sky for the most powerful radiation in theelectromagnetic spectrum. Two of the shuttleastronauts, Jerome Apt, a physicist, and JerryRoss of the Air Force went into space to helpextend the balky antenna on the satellite.

humidity controlled quarters, whowants to be tossed out into the in-hospitable environment of space?EGRET refused to cooperate, that isEGRET's antenna balked. Of courseit had to be fixed, so in NASA's par-lance, an "unscheduled EVA" wasscheduled, and when it was all over,EGRET could speak and be heard.

It is now taking its first look,away from the center of our galaxy,at the Crab Nebula and Gemingasource in the Gemini Constellation.For the technically minded, it islooking at gamma rays in the 100MeV range, with an angular resolu-tion of 5 minutes of arc and a 20percent energy resolution.

And so once again the SLAGcommunity played a key role in amost unlikely play: the marriage ofan earth-bound experiment to a dar-ing contact with the stars. Theprincipal actors too, were not forgot-ten: Roger and Joe were formallyinvited by NASA to participate inthe pre-launch and launch ceremo-nies for SDS-17, a.k.a. the SpaceShuttle Atlantis.

Oh, and for those curiousenough to inquire, EGRET is reallythe Energetic Gamma Ray Explor-atory Telescope, an acronym andnot a shore bird; Atlantis is the newspace shuttle; and EVA whetherscheduled or not is "Extra-VehicularActivity," something that NASA'sspace fixit team does admirablywell.

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Benefits Office NewsTHE BENEFITS OFFICE IS TRYING a new approach to make informationabout benefits readily available. Each month Benefits will dedicate thatmonth to a particular carrier. California Casualty, is the carrier for May.Valerie Cregan, the field representative for California Casualty will be in thelobby between the cafeteria and the auditorium during the hours of 11:30a.m. - 1:00 p.m. on the following dates, May 8, 15,22 and 29th. Check the ben-efits bulletin board for more information on dates, times and specific itemseach month. Any questions, please contact Betty, in the Benefits office, ext.2356.

As you know, California Casualty is sponsored by SLAG for yourauto insurance needs. What you may not be aware of is that California Casu-alty also provides Home, Condominium and Renters insurance to providefinancial protection from fire, theft and other loss.

The type of home policy you need depends on the type of propertyyou own. The policy types and coverages that are available are outline in thebox below.

POLICY TYPEHomeowner

Condominium

Renters

SecondaryDwelling

TYPE OF PROPERTYA dwelling you own& occupy as yourprincipal residence.

A condominium unityou own and occupyas your principalresidence.

Personal Propertyyou own in a renteddwelling or apartment

Type of dwellingor condominiumyou own and use asa vacation home orthat you rent toothers.

COVERAGES PROVIDEDDwellingOther StructuresPersonal PropertyLoss of UsePersonal LiabilityMedical Payments

Personal PropertyLoss of UseLoss AssessmentsAdditions & AlterationsPersonal LiabilityMedical Payments

Personal PropertyLoss of UseAdditions & AlterationsPersonal LiabilityMedical Payments

DwellingPersonal PropertyOther StructuresLoss of Use

With California Casualty both auto and home insurance policiesare available through payroll deduction. To find out more about ourhomeowners or our auto insurance (where we are now offering a good driverdiscount that's 20% lower than the already low SLAC rate), call our San Joseoffice at 1-800-852-6655.

-Betty Strickland

SAFETY CAN BE A COMPLICATED BUSINESS, so the ES&H Division hasinstalled a new HotLine to help you deal with ways and means of meetingsafety objectives. Have you seen a physical hazard recently and wondered towhom it should be reported, or have the usual reporting channels been unre-sponsive? Is there a condition in your work area that needs professionalevaluation, and you don't know who the appropriate professional is? Is therean institutional action (training, communication, coordination) that you feelought to be included in our ES&H self-assessment?

The ES&H HotLine at ext. 4641 can put you in touch with the responsibleperson you seek, and can provide information to help you get a clearer pic-ture about how to resolve problems correctly. It can also provide you an op-portunity to get your concerns "on record."

RADIAT1ION BADGES- WHO AND WHEREWITH THE RECENT ORGANIZ ON of the ES&H Division, many safetyresource people have been relocated to the Electronics Building, # 024. Ifyou have business relating to quarterly radiation badges, you need to seeTerry Ash in Rm. 224 (ext. 4569). Annual badges are processed by ClairStevens in R. 180 (ext. 2388).

:: ': - :: :: :::: : : ::: *: ' : ::: : :: : : : :Judith N ow ag

SLAC HostsTransportationShowSLAC WILL BE CELEBRATING an important environmental event: Clean AirWeek on Thursday, May 9, 1991 from 11:30 a.m. to 1:00 p.m. in the Audito-rium/Cafeteria breezeway. A transportation show will be held featuring freeon-the-spot computer print-outs to match employees with commuters whowork and live nearby. The Transportation Show will be conducted by RIDESfor Bay Area Commuters. Each person completing a ride share applicationwill receive a free coffee mug from RIDES.

Clean Air Week, sponsored by the American Lung Association, is anannual event dedicated to improving the quality of the air we breathe. Therelationship between driving alone and the pollution we breathe is wellknown. Explore alternative ways of getting to work by attending this specialevent. RIDES will be demonstrating their new commutemobile- the futuris-tic answer to the commuting public.

-Bernie Lighthouse, SLACTransportation Coordinator

AssessingOn-site TrafficSafetyIF, IN THE PAST FEW WEEKS, youfelt that you were being watched,you were right. During March, rep-resentatives from Patterson & Asso-ciates, a San Mateo traffic safetyanalysis firm, began collecting dataon traffic patterns at SLAC. The rep-resentatives observed traffic flow atintersections, stop signs, andpedestrian walkways during peakhours.

The SLAC Operating Safety Com-mittee (OSC), together with SLACManagement, will use theinformation from the Patterson &Associates survey, to help themevaluate existing traffic conditionsand determine whether those condi-tions meet safety and vehicle codes.The OSC, made up of about 25 mem-bers, representing severalmajor divisions, meets monthlyabout issues of on-site safety.According to their charter, theirpurpose is "to prevent accidents bydiscovering, analyzing, andproposing solutions to hazardoussituations in fields other than thoseinvolving radiation, earthquake,microwaves, and hazardous experi-ments." The OSC hopes that thefindings from the traffic flow surveywill help determine whether on-sitetraffic has become an issue for theircharter.

Evelyn Eldridge-Diaz

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SLAC Welcomes Guestsand New Employees:

Wanda Gorecki, Mechanical Design;Juergen Lauer, Theory; FuminikoSuekane, Group B; GennadiSmirnov, SSRL; Sabine Schroeder,Library; Hartmut Preissner, Library;Pantaleo Raimondi, Group C;Alexander Bondar, SSRL; AnatolyVorobiov, SSRL; Hideaki Aoyama,Theory, Sergey Shuvalov, SSRL;

Twenty-Eight Year Veteran Bill Clayton Retires

IF YOU WERE IN the central labMachine Shop on the afternoon ofMarch 15, you were one of the manywho attended the St. Patrick'sDay celebration hosted by theWorld's Tallest Leprechaun, BillClayton. It was the last of such par-ties, because GOB - he wasalso known as Good Old Bill tosome - has retired from SLAC inhis familiar costume of green vest,top hat, and curly-tippedshoes.

This last party was one of thecountless gatherings Bill hasorganized over the years; they all in-volved good cheer, goodfriends, good food (do you remem-ber the fine aroma of barbecuedribs around the 4th of July?). Theyoften also involved Sally, the1931 Model A Ford that he lovinglyrestored to glory from arusted shell, and whose birthday wecelebrate every year.

Bill was one of SLAC's longestservice employees, although he ishimself still reasonably young. Hewas hired by Project M on Novem-ber 7, 1963, joining the small groupof people on the Stanford Campuswho were devising the foundationsof the SLAC we know today.Although a nominal member of theCraft Shop plumber crew, he wasimmediately assigned to theResearch Division, where he madehis home for 28 years, and where hebecame famous and respected forskills above and beyond anythingever written in his job description.

From tubing of all sizes bent intointricate coils, to contraptionsbrazed together from the most un-likely metals, to great panels ofinterconnected valves and gauges,to emergency faucet repairs - nomatter how simple or complicated,Bill was there to save the day. Hiswork graces many of SLAC's experi-mental installations, but moreimportantly, his interest, inventive-ness, and dedication areremembered with pleasure by the

Security Head Retires

Jim namm, snown nere In normal 'LAUa artre,plans for a more relaxed retirement.

JAMES HAMM was well knownthroughout SLAC as he made hisdaily rounds as "Mr. Security." Hecovered the entire plant checkingfences, buildings, and storage areaswhile keeping an eye on anyunusual happening that mightrequire further investigation. Hewas always very helpful to thoseneeding assistance in locating

experimenters with whom hecollaborated.

Somewhere in Palo Alto, a bald,twinkly-eyed, bearded gentlemanis now restoring Studebakers,doctoring old Cadillacs, buildingmodel airplanes, enjoying hisgarden, and, we hope, willoccasionally prevail upon Sally tobring him over here to visitand have lunch.

-Tony Roder

people or places and willing to givea helping hand to correct safetyhazards in the field.

Jim first became acquainted withSLAC as a contract guard manyyears ago. He eventually left forother work assignments thenreturned in 1979 as an employeereporting to Chuck Hale in PlantEngineering's laboratory protectiongroup. Jim supervised the RadiationGate guards and directed the effortsof the contract guard servicecurrently provided by BurnsInternational Security Services.

Jim was a member of the HamRadio Club and was often involvedin discussions on improvedequipment and techniques in theworld of ham radio. Jim's manyfriends all wish him the very best inretirement and hope he keeps intouch with us.

Bill Lusebrink

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Editor's Note:

IT IS THE INTENTION OF THE INTERACTION POINTto provide the SLAC staffwith both the news of the retirement of a long service stafffer and also a glimpse'of their retirement plans. We hope to continue these entertaining stories. Therecent staff reductions have caused some affected employees to also opt to retire.For some they had been thinking about retirement for some time and never gotaround to doing it. The layoff was the shove they needed. But others retired to lockin their post-retirement benefits and have actively participated in SLAC's programsto help in their job search.

We wish the following employees well as official retirees who have given manyyears of dedicated service to the laboratory:

John Bernstein, Alfred Shinn, Ed Stephenson, Celik Guracar, Ed Austin,Howard Martin, Frank Generali, Bernie Tice, Keith Henderson, Jozef Zabdyr,Danny Ibrisimovic, Jim Ewing, James Styles, Robert Johnson, Paul Arechiga,Russ Matheson.

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SLED INVENTORS AWARDED 1991 IEEEPARTICLE ACCELERATOR TECHNOLOGY PRIZE

IEEE Particle Accelerator Technology prize winners David Farkas, left, and Perry Wilson posebefore a poster on SLED.

DAVID Z. FARKAS AND PERRYB. WILSON ARE RECIPIENTS ofone of two 1991 IEEE Particle Accel-erator Technology prizes. The twoshare the award for their inventionand implementation of the SLACEnergy Development (SLED) radio-frequency pulse compressionsystem. SLED boosts the currentklystron peak power from 65 MW to165 MW, which is the peak powerrequired to provide the 50 billionelectron-volts of energy to the SLCelectrons and positrons. In answerto a question posed by WKHPanofsky to Greg Loew in 1973,SLED was invented to increase theaccelerator gradient. The develop-ment of SLED was carried out

during 1973-1975 under the direc-tion of Loew.

According to Perry Wilson, "Indeveloping the first working high-power prototype, many trickyengineering problems had to besolved, and most of the credit forsuccessfully overcoming these ob-stacles goes to Harry Hoag." Otherscontributed as well: Hank Deruyterworked with Hoag on extensivemicrowave measurements and RFtests, and Al Lisin engineered theoverall mechanical design. Fabrica-tion of some 240 SLED cavityassemblies proceeded smoothlyover the next three years under thecapable management of Herm Zaiss.

In 1976, under the supervision of

Ernie Frei, installation of productioncavities on the linac began. By 1979,SLED had increased the linac energyby about 60% at a relatively modestcost of approximately four milliondollars. It was then realized that if,in addition, the klystron powercould also be boosted to a higherlevel, the dream of a 50-GeV elec-tron-positron collider was withinreach.

David Farkas recalls some thrill-ing moments during the evolutionof SLED, such as when he realizedthat reversing the phase instead ofturning off the power resulted insubstantial beam energy gain.Equally exciting was when he puttogether a primitive SLED and ob-served the predicted waveform forthe first time.

SLED has been successful inimproving the energy gain for elec-trons and positrons at otheraccelerators as well. CERN (Switzer-land), DESY (Germany), KEK(Japan), IHEP (China), and INP(USSR) all have benefited from theSLED concept.

Each year, IEEE presents theaward in recognition of outstandingcontributions to the development ofparticle accelerator technology. Therecipients are chosen by membersof the IEEE Nuclear and Plasma Sci-ences Society. This year, theawards will be presented at the an-nual ParticleAccelerator Conference in SanFrancisco, on the of evening of May 8.

Andrea Higashi

Attention Fun Runners aTHE RECENT RAINS have made all of us a little buggy, so lets makeanother SLAC centipede for this years Bay to Breakers run on May 19.We already have the bus transportation provided for the race. Weare trying to keep the costume simple, so we promise you won't have topaint any boxes to run in (unless there is an overwhelmingdemand)! The costume is still flexible, so if you have any ideas orif you just want to run with the SLAC centipede call Mary Crumeat 2164 or Ken Witthaus at 2468.

-Mvary urume

5

A A ....

SLAC and The History of The J/psi Discoveryby Robin Chandler

"On the morning of Monday, 11November 1974, members of theProgram Advisory Committee atSLAC were assembling for one oftheir regular meetings. When one ofthe committee members, Sam Tingfrom the Brookhaven NationalLaboratory, met Burt Richter, a lead-ing experimenter at SLAC, he said,'Burt, I have some interesting phys-ics to tell you about.' Richterresponded immediately, 'Sam, Ihave some interesting physics to tellyou about."1

Recently, the SLAC Archives andHistory Office acquired some of theimportant research files of Experi-mental Group C concerning thedevelopment of the SPEAR storagering and the experimental workleading to and including the psidiscovery. The records includegroup leader Burton Richter's filesconcerning the proposal, design,and construction of the storage ring;development of the Mark I andMark II detectors; and technicalnotes and memoranda from experi-ment SP-17. In addition, theacquisition included the experimen-tal logbooks for SP-1, SP-2, andSP-17, and Group C's SPEAR notes.The photographs accompanying thisarticle illustrate some of the kinds ofrecords in the Group C files.

The SLAC Archives and HistoryOffice was established to evaluate,select, and preserve the documen-tary heritage of the laboratory. Themission of the Archives is to pre-serve the records of historicalsignificance created at SLAC. Archi-val records are materials ofenduring historical, legal, financial,or administrative use that will be ofinterest to future laboratory staff,scholars, and the general public.Such materials include a variety offormats and media including corre-spondence, research notebooks,logbooks, technical memoranda,photographs, engineering drawings,

and data summary tapes.The research files of Experimen-

tal Group C will be essential for thecompletion of the J/psi study, a his-toric documentation of the NobelPrize winning discovery. PeterGalison, Historian of Science atStanford, is directing the study ofthis discovery. The J/psi study isone phase of a project sponsored bythe American Institute of Physics(AIP) Center for the History of Phys-ics to study the complex issuesfacing the historical documentationof multi-institutional collaborationsin high-energy physics.

The AIP Multi-Institutional Col-laboration Study is focusing ontwenty experiments carried outfrom the early 1970s to the mid1980s at the four major American ac-celerator laboratories: Brookhaven,Cornell, Fermilab, and SLAC. Stud-ies of the J/psi and the Upsilonexperiments form a major compo-nent of the program. The projectalso includes interviews with physi-cists, graduate students, engineers,computer programmers, and techni-cians engaged in collaborations. Theproject will identify patterns of col-laboration and pinpointdocumentation to preserve. Theseefforts will produce concrete guide-lines to assist archivists preservingthe history of high-energy physics.

Since the beginning of the AIPproject, SLAC has been an activesupporter and participant in thestudy through the contributions ofLouise Addis, Robin Chandler, BillKirk and Roxanne Nilan. SLAC'scontributions have included creationof the collaboration database for theproject; interviews with experimentcollaborators from SLAC, LBL, andUC Santa Cruz; and assisting PeterGalison's research into the J/psidiscovery. (cont'd. on pg. 7)

1 Close, Martin, & Sutton, "Char-monium," The Particle Explosion,p.178

I e scroll, pictured here, was constructed bymembers of the SP- 17 experiment to illustratethe energies that were scanned in the searchfornewparticles. The energies were increasedgradually over time to pinpoint where theparticles were lurking. This photo illustratesthe range between 1.830 Gev and 1.920 Gev,with the "bump" indicating the discovery of thepsi prime particle at a single beam energy ofabout 1.847 Gev (mass of about 3.69 Gev).

In the late 1950s, 500 Mev storage rings forelectrons had been built at the High EnergyPhysics Laboratory on the Stanford campusas ajointStanford-Princeton Universityproject.SLAC planning for SPEAR, a storage ring tocollide electrons and positrons, culminated in1964 with the first formal construction proposal.The SPEAR construction proposal was revisedand resubmitted numerous times, but neverformally approved. Instead in 1970, SLACreceived permission from theAEC to use fundsfrom the lab's regular budget to constructSPEAR. Records developed in the 1966proposal and planning phase of SPEAR areillustrated in the above ohoto.

Luth. This document illustrates some of theinitialanalysis for the Psi particle data collectedby the LBL-SLAC collaboration at SPEAR.

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S-' -7 logDooK page ror the early nours orNovember21st, 1974. At 3:20AM with RobertSterge operating the storage ring and CharlesMorehouse and Alan Litke running theexperiment, the second psi particle wasdiscovered on the first scan of the 3.69 Gevenergy region. This logbook is currently ondisplay at the Smithsonian Institution.

DUIL n1Ciuler, Ivlarlll rI-rl, daru Ufersn uolauIurduer (rignfr o lerTu In mne IHAH- control room looKingat the computer display showing the decay products of the psi particle in the Mark I detector.

Paging System Mysteries SolvedPRESENTLY SLAC HAS three kindsof pocket pagers: a voice pager thatcovers the immediate Menlo Park/Palo Alto area, a digital pager cover-ing the same area, and a 6-countypager that comes in two flavors: onefor the wider 6-county area, and onethat reaches the SLAC tunnels.

The voice pagers are SLAC-owned and were acquired startingbefore 1988.

The digital pagers were acquiredin 1988 and later. The 6-county pag-ers are leased from Pac*Tel andPagenet starting in 1989, when theneed for wide-area coverage and theaccelerator tunnels became crucial.

The telephone directory refer-ence section, (which you can printwith the VM command PHONLISTor display online with the VM com-mand HELP PHONE MENU)describes how to use these threekinds of pagers. Basically, the pag-ing instructions for the voice pager

require you to dial 1-1 and then lis-ten for the voice saying "enter pagernumber." You then enter the threedigit number and listen for the voicethat instructs you to "speak aftertone." You have fifteen seconds tostate your message slowly andclearly. You cannot converse withthe person you are paging.

The other types of pagers onlyallow you have your phone numberor extension to be displayed on a -digital readout. With the digitalpager, you dial 1-2 and proceed asabove and a voice will ask you to"enter function digit." Always enter"5." A voice will ask you to "enternumber to be displayed." Here youenter the phone number or exten-sion at which you want to be called,and hang up.

The newest pagers require call-ing a seven-digit page/phonenumber, and you have to dial "9"first to get an outside line. No one

will answer, however, and all thatyou will hear is three beeps. Here,

- you enter the number you wish dis-played and hang up. The pagerstores up to five callers' numbers.

From offsite these pagers may becalled directly. To access the previ-ous two pagers systems from offsite,the "1-1" system can be reached bycalling 926-3100; the "1-2" system bycalling 926-3200 and following thesame instructions.

The acquisition and repair ofpagers through the appropriate ven-dors has recently been taken over bythe Telecommunications group.Telecommunications is activelyinvestigating ways to streamline theadministration and service of thesedifferent pocket paging systems toprovide better and more cost-effec-tive service to SLAC users.

-lisa Vinson

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BEACH'SBOOKPUBLISHEDBOB BEACH is the ComputationResearch Group's programmerextraordinaire who single-handedlydeveloped SLAC's 'Unified Graph-ics' system. Unified Graphics, or'UG' as it's popularly known, isfound today on over 150 Vax andIBM computers at institutions in 15countries, and also underlies suchbest selling applications as 'TopDrawer' and 'HandyPak.'

UG was the first 'device-inde-pendent' graphics system for thehigh-energy physics community(Device independence means thatyou don't have to make extensivechanges to a program every time anew graphics device appears). It'slong been the mainstay of physicsdata analysis displays at SLAC andis renowned for its reliability as avirtually bugless program whoseauthor demands (and supplies)perfection.

Bob Beach - the man who Unified Graphics, displays his new book

Bob has now turned his talents toanother kind of writing and his newbook is:

AN INTRODUCTION TO THECURVES AND SURFACES OFCOMPUTER-AIDED DESIGN byRobert C. Beach. N.Y., VanNostrand Reinhold, 1991. 306p.($39.95).

It's aimed at a wide audience ofmathematicians, computer scien-tists, and engineers who'd like tounderstand what's going on behindthe scenes in CAD systems.

Copies are available in the libraryand at your local technical bookstore.

Louise Addis

It's Time to Join Garden ClubSPRING HAS ARRIVED, whichmeans it's that time of the year tostart planting your summer crops.Garden Club renewal notices weresent out at the beginning of themonth to all current members. Therenewal fee this year is $5.00 perplot which includes a $3.00 chargefor freeze damage repair work thathas already been completed. Pleasebe sure to renew by May 1, 1991otherwise your plot will be consid-ered new and the fee will be $7.00.Checks should be made payable toSLAC/Addison-Wesley GardenClub and returned to RoxanneContaoi at Bin 79.

Overseeing the Garden Club thisyear is Walt Inman ext. 2828 (message)and Roxanne Contaoi ext. 3735.

Garden Club members should bereminded to please use waterwisely. We are also checking intoseeing what can be done about thesquirrel situation which has cer-tainly frustrated many Garden Club

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Springtime came to the SLAC CommunityGarden

members. If you have any questionsor comments, or if you did not re-ceive a renewal notice please contactWalt or Roxanne.

New Members Welcome:Is water conservation so tight at

home that your grass is brown andyour plants dead? Do you need torelease some of that office tension?Then why not join SLAC's GardenClub where for a $7.00 membershipfee per plot you are provided withwater, compost, and the use of as-sorted garden tools and equipment.By being a member of the GardenClub you can let out some of youraggressions by swinging a hoe, inaddition to getting some fresh airand a little exercise. Garden Clubplots measure 10' by 20' and arelocated just across from SLAC'sGeneral Services Building.

New members can sign up afterApril 15. Please contact Walt Inmanor Roxanne Contaoi for details.

Roxanne Contaoi

The Interaction Point is published by Information Services of Stanford LinearAccelerator Center. Editors: Bernard Lighthouse and Bill Kirk; Photographer: TomNakashima. Deadline for articles is the first of every month. Submissions may besent on SLACVM to TIP or by SLAC mail to TIP, Bin 68. Phone 926-2358.

." '1� i".-.m 'ME: I