4000

3500

3000

2500

2000

1500

Me

asu

red

Me

lt T

em

pe

ratu

re (

K)

400035003000250020001500

Published Melt Temperature (K)

BlackbodyTmelt GreybodyTmelt 1 to 1 fit

Greybody Average Difference: -96 KBlackbody Average Difference: 22 K

Recent Results—Melting Point Temperature Validation ( Wire Heating)

W

Mo

PtFe

Ni

Recent Hardware Improvements—Sketch of Laser Heating System in 12.2.2 Hutch

Top Shelf-Map View

BeamSteerer

(top of periscope)

iris aperture

TR&

YLFMirrors

1mlens

1mlens

IRfilter

irisaperture

T.RMirrorT.R

Mirror

Spectrometer

50:50Sampler

Spectrometer

½”CCDCam

TV

50:50Sampler

TV

YLF BeamSplitter

TRMirror

IRfilter

½”CCDCam

~ 0

.5 m

eter

~0.5 meter

Quantronix Falcon 217DNd:YLF 1053nm 50W TEM 01laser on lower shelf

wp

bd

pbc

BE

New-Power Control Setup

*Spectrometer alignment corrected!

Recent Results—Melting Point Temperature Validation (Laser Heating 25 m Fe foil)

(temperature/coupling varied at constant waveplate voltage)

Recent Results—Melting Point Temperature Validation (Laser Heating 25 m Fe foil)

Recent Results—Melting Point Temperature Validation (Laser Heating 25 m Fe foil)

(~ 2 m/pixel)

Recent Progress—Software Improvements

Software Improvements:*-range user-changeable*fits weighted by SR

(~ 120 m)

Pt in Al2O3Fe foil (25 m) mounted btwn glass slides

Recent Progress—Visual Observation of Melt and In-Situ Diffraction

Large hotspot (FWHM > 40 microns) during laser heating of Fe foil at ambient

x-ray beamsize(~ 12 m)

Future Plans-- High-Temperature Laser Heated In-Situ Diffraction

Simultaneous diffraction and heating from Pt/Al2O3 DACs has not gone well.Samples not coupling well and visualizing samples difficult.Max Temps for Pt in DAC below Tm.

Last beamtime used to diffract from ambient Fe foil.No clear liquid diffraction from Fe,

but signal from high temperature -phase and -phase…more time for xrd analysis needed.Also, the sample moves/migrates during heating, making steady measurements challenging

Before Heating After Heating

Future Plans-- High-Temperature Laser Heated In-Situ DiffractionPlans:

Complete Validation of Temperature Determination:1)Ambient Resistive Melting (Done)2)Ambient Laser Melting (Fe done, Pt next)

also w/x-rays3)Comparison of Pt melt curve

(better DAC loadings)ES2 paper

SRI proceedingsContinue software improvements

more automatedmore analysis tools

New optics *obj. lens –possible source of coma*glass pellicle b.s.—improve visualization)

New laser*diode fiber lasers

Hardware reconfigmotorized slitssimpler optic path (laser steering independent of visualization and temperature determination optics)optics ray tracing