Celebration of Dorfan/Hitlin Panofsky PrizeJanuary 13, 2016

Thoughts on PEP-II and

Jonathan Dorfan

Receiving a Prize of this caliber is a great honorbut

Receiving a prize that bears Pief’s namemakes it doubly special

As a scientist and administrator, I strove to emulate Pief’s unflinching dedication to: Above all, the science must be outstanding Technical innovation moves science/humanity forward People are the most critical resource: respect & nurture

them International cooperation is essential to science Never allow expediency to undermine integrity: stand

firm for what is “right”

A Long Collegial and Personal Friendship

1972-1976: David was spokesman of my thesis expt., E92 at SLAC

1977 - ~1980: MARKII Liquid Argon Calorimeter construction, testing, commissioning1989 – : B Factory, PEP-II/Babar

Slide Courtesy of Pier Oddone

This led to at least 21 e+e- B Factory concepts and proposals (19Y(4S) + 2 Z0) and several hadronic machine approaches (HERA-B, ..

Pier Oddone’s concept of using an asymmetric e+e- collider to boost the distance between the two decay vertices was, in the end, the most successful approach.

Table Courtesy David Hitlin

Two colliders, PEP-II and KEKB, were ultimately built

•Y(4S) Storage Rings Y(4S)Linac-Ring

Collider

Y(4S)Recirculating

Linear Collider

ZFactorySymmetric Asymmetric

PSI (2) APIARY Grosse- Wiesmann

Amaldi/Coignet SLC

Novosibirsk CITAR JLAB ARES LEPKEK

accumulatorPEP-II UCLA

CESR Plus PETRA TBAISR Tunnel

KEKaccumulator

KEK-BCESR-B

Slide Courtesy of Pier Oddone

Early PEP-II Ring Layout (two tunnels) (1989)

Page 7

Workshop in Chateau de Blois, Blois, France: Summer 1989CP violation and beauty factories and related issues in physics

Workshop in Chateau de Blois, Blois, France: Summer 1989CP violation and beauty factories and related issues in physics

SLAC Colloquium March 1990 – Two rings in one tunnel

1990

Sin2b = ~ 0.17

1991

Sin2b = ~ 0.95

1991

John O’Fallen: The believer

The Sponsor : DOE

On-Site Oversight Office

Danny Lehman: Uber “Auditor”

The Funders : Congress

PEP-II Central Management

Special Assistant

Whatever Needed To Be DoneSafety Data Management Administration

PEP-II Construction “System Managers”

High Energy Ring Low Energy Ring Injection Controls

RF Utilities

Installation

Backgrounds,Interaction Region

Sampling of Personnel That Worked on the Early Design And/or that were part of the Construction Team

e- (e+) at end of New Injection Lines: Oct ’95 (97)

e- beam through 1/3 of HER : May ‘97

Stored e- beam in High Energy Ring: June ‘97

e+ beam to Low Energy Ring Arc 7 Temp. Dump: Jan 98

Strategy of Staged Completion and testing of the major subcomponents with real beam

Measure/Characterize the backgrounds before Babar moved on line

U. Wienands, SLACB-Fact. Symposium, 27-Oct-08 26

U. Wienands, SLACB-Fact. Symposium, 27-Oct-08 27

1.2x1034/cm2/s !!1875 mA/HER

2900 mA/LER

1722 bunches

≈154/fb

U. Wienands, SLACB-Fact. Symposium, 27-Oct-08 28

PEP-II Turned Off April 7 2008

*

October 27, 2008 PEP-II BaBar Symposium Page 58

PEP-II Team April 2008

Receiving a Prize of this caliber is a great honorbut

Receiving a prize that bears Pief’s namemakes it doubly special

As a scientist and administrator, I strove to emulate Pief’s unflinching dedication to: Above all, the science must be outstanding Technical innovation moves science/humanity forward People are the most critical resource: respect & nurture

them International cooperation is essential to science Never allow expediency to undermine integrity: stand

firm for what is “right”These principles were all necessary, and more importantly, ever-present for the success of the PEP-II a adventure