^Interaction PointEvents and Happenings

in the SLAC CommunityJanuary 1997 Vol.J, No. 1

New Year'sGreetings fromthe DirectorGreetings and welcome back. Ihope that all of you had pleasantholidays with your family andfriends and that the New Yearfinds you in good health andgood spirits.

Even though it is a new calen-dar year, we are several months

intr thf ficrql1 ILL. LILL. LJLOLto lA

year and so farwe are managingto adapt to ourbudgetary con-straints. We canexpect PresidentClinton to sendL-_, TbV/O --r ' - -,,-

Burton Richter ltne r Y SO U gUetrto Congress

sometime in February or Marchand I will let you know what thatbudget might mean for SLACwhen we have more news.

Please plan to attend someother events coming up this quar-ter. We will hold a training pro-gram for employees on recogniz-ing and avoiding sexual harass-ment. I hope that the programwill help build a better workenvironment for all staff.

We all want a safer environ-ment, so we will repeat the safetyawareness meetings of last year.The two major questions which Iwould like you to think about asyou go into those meetings are"How well has the Lab respond-ed to the concerns expressed inthe 1996 meetings?" and "Whatnew issues have emerged?"

Remember that we all need towork safe, work smart.

International Exchange at SLACA group of SouthAfricans visitedSLAC as part of anAmerican tour ofDOE laboratories inDecember. The dele-gation was re-searching methodsby which they couldbetter integrate busi-ness and universityUT\Aoorohb hrrI-Ih Burl

2)00

ii

LE2

itrarctLL LiLnUL1L 6- SPEAR Ring to South African visitors: Joshuavernment-sponsored Grobbelaar, Mbudzeni Sibara, and Stephen Lennonlabs in their own (not shown Dherendra Gihwala).country. This is thefirst delegation following the Gore-M'becki accord resulting from visits ofSecretary Hazel O'Leary to South Africa.

The visit was hosted by Sidney Drell, SLAC Deputy Director, andJonathan Dorfan from PEP-II. Dorfan is a native of South Africa and hedrew on his knowledge of both countries to help explain various projectsor interactions.

The visit included a briefing by Dr. Drell, a site tour and afternoon teawith graduate students. The visitors were especially interested in why

students chose toconduct theirresearch at SLAC."This session withthe students wasmost useful," saidGrobbelaar. "We seethat the entire spec-trum of educationmust be addressed- teachers, stu-dents and the litera-rwr nf th, opnnor:1

for a formal photo after their sessions. Seated (I to r): Uy '- L.1L .UlLCIaArthur Bienenstock, (Associate Director, Synchrotron public."Division), Mbudzeni Sibara, Mandeep Gill (UC Berkeley), After leaving SLAC,and Dherendra Gihwala. visitors spent half aStanding (I to r): Joshua Grobbelaar, David Reyna day each at Li-(American University), Anneli Munkholm (Stanford vermore and Ber-University), Robin Erbacher (Stanford University), HollyZhang (Stanford University), Sidney Drell (SLAC Deputy keey before head-Director), Stephen Lennon, and Jonathan Dorfan (B- ing off to Oakridge,Fartnr/ A.qonni.te Director). then home.

_ ___ _ __-

..

I ALtwI -"", - "-- -

1

PPM Klystron Gives NLC a BoostHistory was made at the SLACKlystron Lab in 1996 when 10 lbs.of ring-shaped permanent mag-nets were used to replace a 1/2ton, 10 KW solenoid to focus theelectron beam in the 50-MW NLCklystron. The cost of electricpower for the proposed NLC is asource of great concern. Most of itwill be consumed by the 10,000klystrons required to energize themachine. This one bold step,replacing power-hungry solenoidswith permanent magnets, willreduce the NLC electric power billby as much as $30 million peryear. Happily, the new klystron isalso more efficientthan its solenoid-focused predecessor,resulting in an addi-tional savings of asmuch as $20 millionper year in electronbeam power.

Permanent mag-net focusing of accel-erator klystrons is notnew to SLAC. The 30-MW, XK5, whichpowered the accelera-tor in the 1960's and1970's, used a largebarrel-shaped perma-nent magnet to focusthe beam. Producingthe much higherfields for the NLC kly-stron required a dif-ferent approach. We 1.7 rused what is calledperiodic permanentmagnet (PPM) focus-ing, which consists ofan array of closelyspaced magnetic lens-es of alternatingpolarity, driven byring-shaped, high-energy, rare earthmagnets. The mag-nets and pole piecessurround the electron

beam just outside the klystron'svacuum envelope.

Though the near-perfect beamfocusing required by a 50-MW X-band klystron had never beforebeen achieved with PPM focusing,we believed it could be done if weused the shortest possible lensspacing. It is known that the moreclosely spaced the magnetic lens-es, the more tightly confined thebeam. In the past, PPM focusinghas largely been confined to muchlower power traveling-wavetubes. These are limited by con-struction features to lens spacingsthat are at least double those that

we used. Traveling-wave tubesseldom achieve better than 98%electron beam transmission,which compares with 99.9% forthe new SLAC klystron. This 20-to-1 improvement in interceptedbeam power turned out to be thedifference between success andfailure. With the "proof of princi-ple tests" behind us, we havestarted work on a 75-MW, NLCklystron that is being totallyredesigned for low-cost mass pro-duction.

Robert M. PhillipsKlystron/Microwave Department

PPM Focused Klystron

;rtereguide

tyIMagnetic field "

SamariumI -- cobaltV-`<- permanent/ magnet rings

:i'i~i/~f ~ permnen

Spacer

avities & focusing structure

6---968181A11

2

T

Poster Workshop: Third of Series, Jan. 24thThe third workshop in a three-part series on conference poster prepara-tion offered by the Technical Publications Department will be heldJanuary 24, 1997, in the SCS Conference Room (third floor) at 3:30 pm.

This workshop focuses on using Microsoft PowerPoint (on Mac or PC)to create single-piece, large-scale color printouts which may be used asconference posters. Terry Anderson (Lead, Computer Graphics) willdemonstrate how to use a set of PowerPoint templates customized forSLAC authors by the Technical Publications Dept. staff. If there is timeafter the poster session, Terry will also demonstrate using the PowerPointtemplates to create viewgraphs with a consistent SLAC look-and-feel.

The contents of the two poster workshops preceding this one in theseries-"Poster Basics" and "Making Conference Posters Using AdobeIllustrator"-are documented on the WWW in the TechPubs Help Pages:

http://www/grp/techpubs/help/posters/basics.htmlhttp://www/grp/techpubs/help/posters/illustrator-slaconly/Note that if you are accessing the TechPubs Help Pages from off site,

you'll need to replace "www" in the URLs above with "www.slac.stan-ford.edu" Non-SLAC users cannot access the "slaconly" URL.

Beyond VM: The Next GenerationIf you are still using VM or if you have questions about how to make thetransition to Windows NT, Mac OS, or UNIX, then come to the VM Phase-out Fair. The fair, entitled "Beyond VM: The Next Generation," will beheld February 11, 1997 between 9 am and 4 pm in the Auditorium. Youwill see demonstrations of the Web, News, and Eudora (which is the sup-ported mail system on Windows NT and the Mac). On your way to thedemos, ask the staff in the Auditorium Lobby your questions and seepersonalized demos of SLAC-supported and recommended software.

Watch for a flyer about the Fair as we get closer to February 11.Ilse Vinson

Micom Switch PhaseoutThe remaining Micom Switch is scheduled to be taken out of service onSeptember 1, 1997. SCS is asking all those who are currently using aMicom connection to complete an information form that will help usdetermine who is now using the Micom Switch and who needs help infinding an alternative connection to the SLAC network. You can pick up aform at the SCS Help Desk.

For more information, see the file micout memo * on VM, or the Website at www.slac.stanford.edu/comp/net/miicm/micom.phaseout.html

Ken Martell

SLAC and SU Host International Web ConferenceLots of organizational activities are going on behind the scenes right nowto bring you the Sixth International Web Conference, which will be heldat the Santa Clara Convention Center, April 7-11, 1997. Bebo White of SCSis co-chair, along with Chris Quinn from Stanford.

The Web 6 conference is collaborating with Hypertext'97 and theComputing in High Energy Physics (CHEP97) conferences which takeplace the same week. Program papers and presentations of significant in-terest to the attendees of these conferences will be broadcast either live oron tape between conferences. See the web site, www6conf.slac.stanford.edu.

3

.

And the winner is...SLAC's fastest,Michael DiSalvo, crosses the finishline with a time of 22:29.

Dave Hamilton are all smiles at thebeginning of their 2-mile walk!

Silver SLAC Run a Smashing SuccessFifteen in-line skaters joined 95 runners and 48 walkers to make the 25thAnnual SLAC Run, Walk and Roll the largest one ever. The annual event,held this year on a sunny November 7 took place along the KlystronGallery.

In keeping with the historical significance of the event, Ken Moore,the race originator and first ever winner, returned as the official starter.Two other early race participants were Hal Tompkins (SSRL), winner in'77 and first to break 20 minutes on the course, and Mike Fero (SLD), win-ner in '88, '89, and '90. Other past race participants seen in the crowdwere Phyllis Olrich, the all-time women's record holder from the '77 race,Bill Divita, winner in '74 and '75, and Gerard Putallaz, third place winnerin '72 and '74 who showed up on crutches to watch and cheer.

In-line skaters started the event. A tactical race developed down thesouth side of the gallery, with no one willing to make an aggressive chal-lenge. After leading most of the race, Kevin Kendall was caught andpassed at the last second by Keith Reynolds; both finished in 14:48, justtwo seconds ahead of Bryan Harris. Ginger Byam set the standard forwomen in-line skaters finishing in 21.20.

Two minutes after the skaters started, the runners took off. KarenFant, running her twelfth SLAC Race, ran a steady seven-minute pace toshave almost a minute off her personal best. She finished 45 secondsahead of Immaculata DeVivo. DeVivo, the first non-SLAC female finisher,and Chris Burge, winner in the men's category, are husband and wife.Ex-SLACer Evelin Sullivan finished third followed by Carol Chao (SSRL).

The race for first among the men was a carbon copy of the last fourraces with Michael DiSalvo (PCD) competing against Chris Burge (non-SLAC). Mike and Chris had each won two of the past four races with theother finishing second. Finishing third was Bobby McKee who shaved 20seconds off his previous best time and finished 44 seconds behindDiSalvo. A very special mention goes to those who keep on running. BobGex completed his eighteenth running of the SLAC race.

The 48 walkers covered two miles and added much to the spirit of theday. Among the walkers were Neal Adams, winner of a 100-yard dashheld at the 1978 SLAC Race, and Mary Dageforde, a runner in '77, '78,and '80.

All were greeted at the finish with music and cheers. Ribbons wereawarded to SLAC runners and skaters who finished first in their respec-tive age divisions. Non-SLAC winners received official recognition.Complete results will be published in The California Schedule and areavailable on the Web at http://www.slac.stanford.edu/esh/medical/now/slacrace

Bob Trailer

Photos byTom Nakashima

Tom Knight, official timekeeperchecks racers' times. With 110 finish-ers (runners/roller bladers), that wasno easy task!

SLAC Run/Walk t-shirt, which was designed byRuth McDunn.

4

Ken Moore, otticial starter,was the race originator 25years ago.

,,lilllIlUfl/- dI/. rC:uZl, I r/ ; Li r cL ir\L vvilII ll l O I C1II11 , yL L/LY /I U Ic, (I LJ & Ij/.

Bobby McKee, Greg Mitchell, Doug Keeley, Al Lisin, Michael DiSalvo (overallwinner, male), Darren Marsh, Karen Fant (overall winner, female), ReneDonaldson, Nina Stolar, Carol Chao, and roller bladers Keith Reynolds (1stplace, M); Ginger Byam (1st place, F). Kneeling are Andrew Gray, age 13, andChris Constable, age 9, sons of Robin Gray and Allen Constable, respectively.

Are we having fun yet? VinceVillanueva came in 4th placein the roller blade divisionwith a time of 15:20. iveet me uoliulers, wno ygo a z-mInure stiarT n uIne orneL uirs (i

avoid colliding with racers!). L to r: Keith Reynolds, PhilGarcia, Bryan Harris, and Jeff Garcia.

On your mark... 95 racers and 48 walkers are poisead or Tne signal to uegyi.

5

Practice Makes Perfect

Are there enough musically talented SSRL staff, students, and visitors toform an ensemble for the SSRL Holiday party? Can they play Jingle Bellsand Silent Night? Yes indeed, and here they are. Pictured (I to r): AlanSwithenbank, percussion, Vincent Lawrence, guitar; Jeff Moore, tenortrombone; Alan Winston, soprano recorder; John Arthur, violin; RonGould, bass trombone; Hope Erickson, violin, and Harry Morales, trum-pet. Not pictured: Cecile Limborg, violin, and Ben Scott, keyboard. And,no, they are not for hire!

1997 Holiday ScheduleNew Year's Day, 1997 Wednesday Jan. 1, 1997Dr. M. L. King Day Monday Jan. 20Presidents' Day Monday Feb. 17Memorial Day Monday May 26Independence Day Friday July 4Labor Day Monday Sept. 1Thanksgiving Thursday, Friday Nov. 27, 28Christmas Thursday, Friday Dec. 25, 26New Year's Day 1998 Thursday Jan. 1, 1998

Birthday Holiday (employee's and supervisor's choice of day)

The Interaction Point © 1997, is published by Stanford Linear Accelerator Center. Editor-in-chief, P. A. Moore; Production Editor, Vickee Flynn. Deadline for articles is the first of everymonth. Items are published on a space-available basis and are subject to edit. Submissionsmay be sent electronically to tip@slac.stanford.edu or by SLAC ID mail to TIP, MS 20. Phone926-4208.

SLAC High Energy PhysicsFaculty MilestonesSidney Drell was awarded the World Fe-deration of Scientists' Gian Carlo WickCommemorative Gold Medal at a formalceremony in Lausanne, Switzerland. Drellwas cited for his work in particle physicsand reduction of nuclear weapons.

Edward Garwin, Group Leader of thePhysical Electronics Group, will be on sa-bbatical from January 15, 1997, until July15, 1997, to work on a research project,"Search for elementary particles with frac-tional electric charge, using aerosol tech-nology." He will be conducting the re-search at ETH Zurich.

Charles Prescott recently celebrated 25years of service to SLAC. Prescott is GroupLeader of Experimental Group A. Hestarted out as an Research Associate atSLAC in 1971 and became a PermanentStaff in 1974. In 1980, he was promoted toAssociate Professor. Since 1984, he hasbeen a Professor in the experimental par-ticle physics, electron scattering experi-ments in End Station A and physics withthe SLD experiment at the SLC. He alsoserved as Associate Director of the Re-search Division from 1986-91. Prescott re-ceived the W.K.H. Panfosky Prize for ex-cellence in High Energy Research in '88.

Burton Richter was named president ofthe International Union of Pure and Ap-plied Physics, an organization which pro-motes international collaboration in phy-sics, fosters free circulation of scientists,and encourages research and education.IUPAP is based in Sweden.

Ronald Ruth was promoted to full profes-sor at a recent meeting of SLAC HighEnergy Physics Faculty. He is Group Lea-der of the Accelerator Theory and SpecialProjects Department. Ruth will take a sab-batical at CERN starting in August, 1997,to work on LEP II, the upgrade of theLarge Electron Positron Collider, and onCLIC, the Compact Linear Collider.

Rafe Schindler was promoted to full pro-fessor at a recent SLAC High Energy Phy-sics Faculty meeting. He is co-groupleader of Experimental Group E.

Rose Forbes

Welcome Guests and New EmployeesThe following people joined SLAC from late October through

early December: John Bargar, SSRL; James Beach, ExperimentalGroup C; Gerhard Buchalia, Theory; Jaime Carrillo, SCS;Chang-Hwan Chang, SSRL; Guang-Pei Chen, BaBar; MerleCramar, Mech Design; Walter Dittrich, Theory; Valerie Halvo,Experimental Group E; Osvaldo Herrera, SCS; Hope Johnson,ES&H; Roger Jones, ARD-A; Judy Li, SSRL; Michael Melles,Theory; Daphne Mitchell, SSRL; James Peck, SSRL; PaulRaines, BaBar; Erickson Ramirez, PEP-II; Norma Sandy,Personnel; Oliver Stachs, SSRL; Marianne Stroker, TechnicalInformation Services; Pei-Pei Xie, BaBar; Slawomir Zalog, EFD

6

.

----