Herman Winick Mentorship October 2, 2012 Herman Winick Mentorship J. Schmerge 1.

Herman Winick Mentorship October 2, 2012

Herman Winick Mentorship

J. Schmerge

1

Brief History I

• 1995 first meeting with Herman and interviewed for a postdoc position a few months later

• Thrilled to get a job offer• Started working on the Gun Test Facility (GTF) to

improve injector brightness in January 1996• Worked closely with Herman building,

commissioning and improving the GTF for 3 years• In the process Herman transferred a lot of

knowledge about projects and management to me and other students


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Brief History II• Early 1990’s Winick was coordinating a group from LBL, LLNL, SLAC and UCLA

studying linac driven X-ray FELs• Study group realized R&D on sources was required to produce the necessary

brightness for an X-ray FEL and Winick started collaboration to build new RF gun– BNL (I Ben-Zvi, X. Wang)– SLAC (H. Winick, D. Palmer, R. Miller)– UCLA (J. Rosenzweig, C. Pellegrini)

• Winick proposed the Gun Test Stand, later called GTF, at SSRL to characterize electron injectors and reduce the emittance to the sub micron level necessary for linac driven X-ray FELs– SLAC (H. Winick, J. Schmerge, M. Hernandez, H. Wiedemann, J. Weaver and SSRL

staff)– University of Rochester (D. Meyerhofer, D. Reis)

• By 2006 GTF developed new injector which provides sub-micron emitance for LCLS based on prototype gun measurements

• Developed the theory for metal cathodes to predict thermal emittance and quantum efficiency


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RF Gun


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Scale2" 3"0 1"

Scale2" 3"0 1"

GTF Layout


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MOD1 KLY-1

GTFLASERROOM

3M LINACRF

GUN

DIAGNOSTICROOM

MOD2 KLY-2

MOD3 KLY-3

GTFControlRoom

8 m LaserTransportSystem

SSRL Injector Vault

DIAGNOSTICS

GTF


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First Beam (1997)


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Longitudinal Phase Space


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-150

-100

-50

0

50

100

150

-2.0 -1.0 0.0 1.0 2.0Dt (ps)

DE

(k

eV

)

downstreamlinac

spectrometer

upstreamlinac

Twiss ParametersDownstream Linac

RMS Unitst

11 0.575 ps2

t12 -100 keV pst

22 17629 keV2

el 6.8 keV pss

E 133 keVs

E uncorr 9.02 keVs

t 0.76 ps

slope -175 keV/ps

Transverse Phase Space


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-300

-200

-100

0

100

200

300

-400 -200 0 200 400

Dx (mm)

Dx'

(m r

ad)

head

tail

projected0.0

0.10.2

0.3

0.40.5

0.6

0.70.8

0.9

-2.0 -1.0 0.0 1.0 2.0

Time (ps)Projected values displayed at t=0

e n (mm)

Gaussian

RMS

Slice Emittance

en

(mm

)

Mentor

• Mentoring is a process for the informal transmission of knowledge, social capital, and the psychosocial support perceived by the recipient as relevant to work, career, or professional development;mentoring entails informal communication, usually face-to-face and during a sustained period of time, between a person who is perceived to have greater relevant knowledge, wisdom, or experience (the mentor) and a person who is perceived to have less (the protégé) (Bozeman, Feeney, 2007).


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Lessons From Herman

• How to survive on a shoestring budget• How to build a collaboration• How and when to stay below the radar• How to work at a national laboratory• Work and safety planning• How to beg, borrow and steal from better

funded groups


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Life Lessons

• Lead by example• Compassion for colleagues• Conflict resolution• Communication, communication,

communication• Benefits of frequent flyer membership• Parenting


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Non-Technical Lessons


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Winick Impact

• LCLS success in part due to the injector R&D program he had the vision to begin– Reduced correlated energy spread– Eliminated the quadrupole field in the gun– Added solenoid correctors that are essential to the

LCLS operation• Mentoring

– My career was possible because of what I learned working with Herman

– I hope to pass the torch and be as successful mentoring others as Herman has been


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Herman Winick Mentorship October 2, 2012 Herman Winick Mentorship J. Schmerge 1.

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