SSRL Beam Line Infrastructure - Tom Rabedeau

SSRL Beam Line Infrastructure

UpdateFebruary 2002

• Recent Upgrade Work

• Expectations for 2003-2004

SSRL Beam Line Infrastructure - Tom Rabedeau

Mono Upgrades 2001-2002 Run LN Monos on BLs 6-2, 9-3, and 10-2

LN monochromators are scheduled for installation this run on the following BL:

• BL9-3 (installed)

• BL10-2 (installed)

• BL6-2 (4/29 installation)

• BL4-3 & 7-3 in fab

SSRL Beam Line Infrastructure - Tom Rabedeau

BL11-2 Optical PerformanceSiderite pre-edge feature (Farges)

0

0.01

0.02

7109 7111 7113 7115

exp

fit

lines

baseline

Energy (eV)

11-2: norm. resol. (2 mm slits)

1.25 eV fwhm

0

0.01

0.02

7109 7111 7113 7115

exp

fit

lines

baseline

Energy (eV)

11-2: high res. (0.25 mm slits)

1.03 eV fwhm

0

0.01

0.02

7109 7111 7113 7115

exp

fit

lines

baseline

Energy (eV)

4-3: high resol. (0.5 mm slits)

1.33 eV fwhm

“Under normal resolution BL11-2 achieves an excellent compromise between resolution and signal/noise, equivalent, if not better, of a "state-of-the-art" undulator beam line on a 3rd generation source.”

F. Farges

SSRL Beam Line Infrastructure - Tom Rabedeau

BL9-3 LN MonochromatorInitial Results

• Little change in flow-induced noise below 75 Hz for flow rates up to 500 lit/hr

• 0.07 eV maximum edge shift at Cu K edge over 16 hrs including SPEAR fill (ΔE/E=7.8x10-5 eV at 9 keV)

• ~0.02% I0 noise at copper K edge

• 1.7 eV maximum edge shift at Te K edge over 12 hrs including SPEAR fill (ΔE/E=5.3x10-5 eV at 31.8 keV; <0.2 eV typical scan-to-scan shift)

• ~0.07% I0 noise at Te K edge

• Shift in crystal tuning from 5 keV to 37 keV less than a Darwin width

SSRL Beam Line Infrastructure - Tom Rabedeau

BL11-3 – New Beam LineCharacteristics & Status

• quasi-fixed energy side station serving macromolecular crystallography and materials science scattering communities

• characteristics

– side scattering, focusing, I-beam shaped crystal, Si(311) mono provides 2.25:1 source horiz. demagnification

– 1 meter long, Rh-coated, quasi-elliptical, Si mirror provides 3.5:1 source vertical demagnification (15 keV cutoff)

– kappa diffractometer w/ area and point detectors– energy = 12720 +/- 75 eV with 0.18% band pass– focus fwhm = 3mm x 0.1mm (SPEAR3)– flux = 4x1012/sec (SPEAR3 at 500 mA)

• Status– installation scheduled to start 4/10/02

SSRL Beam Line Infrastructure - Tom Rabedeau

SPEAR3 Opportunities

beam line 1keV 10keV 1keV 10keVbend 4.7x 9.9x 89x 188x

BL4/7 ID 13.9x 15.3x 116x 127xBL9 ID 5x 5x 43x 43x

flux brightnessbeam line 1keV 10keV 1keV 10keV

bend 4.7x 9.9x 89x 188xBL4/7 ID 13.9x 15.3x 116x 127xBL9 ID 5x 5x 43x 43x

flux brightness

BL9-2 (1mr accept)SP2

SP3

• 5-15 fold flux gain

• 5-200 fold brightness gain

• enhanced beam stability

• world class soft x-ray undulator performance

• small gap hard x-ray undulator opportunities

• performance vs SPEAR2:

SSRL Beam Line Infrastructure - Tom Rabedeau

SPEAR3 Beam Line UpgradesGoals and Priorities

• Objective:

– Upgrade beam line optics, etc to facilitate optimal exploitation of the SPEAR3 source characteristics.

• Schedule/Priority:

1 All front ends – 500 mA capable on SPEAR3 startup (Fall 2003)

2 Insertion Device (ID) beam lines – 500 mA capable as soon as possible given resource limitations

3 Bend magnet beam lines – 500 mA capable (though perhaps with degraded capability) as soon as feasible given resource limitations

• Funding:

– DOE BES, DOE BER, NIH NCRR,...

SSRL Beam Line Infrastructure - Tom Rabedeau

• Evaluate and optimize beam line functionality in the context of the present/future user community needs

• Mask, filter, window, and optic upgrades as required to cope with the power increase

• Focusing optic upgrades to faithfully image the source

• Position monitor, optic, and support structure improvements to preserve SPEAR3 stability

• Shielding modifications to ensure SSRL continues to operate safely

• New insertion devices for BL 4, BL 7 to fully utilize the SPEAR3 source characteristics and provide new capabilities

SPEAR3 Beam Line UpgradesProgram Elements

SP2

SP3

BL4-2 focus w/ 2mr accept.

SSRL Beam Line Infrastructure - Tom Rabedeau

SPEAR3 Beam Line UpgradesOptical Configurations

• Most beam lines will experience optics improvements but relatively modest conceptual changes.

• There are, of course, exceptions to this rule. A few of the more notable planned exceptions are:– BL5-2, 5-3 - the Locust monochromator will be

replaced and the beam line optimized for 250-1200+ eV operations (currently 10-1200 eV);

– BL7-2 - the conventional toroidal mirror focusing system will be replaced with a cylindrical mirror and a sagittal focusing monochromator for improved high energy performance;

– BL4-3 & BL7-3 - add collimating mirror optics;– BL6-2 - the optics will be transformed to a double

mirror system similar to BLs 9-2, 9-3, and 11-2 and optimized for >5000 eV operations;

– BL3-3 - the beam line will be optimized for 1750-5000 eV operations;

– BL8-2 - will be optimized for 250-1900 eV operations with the inclusion of a multilayer grating and reconfigured mirror optics;

– BL4, BL7 which will benefit from new 20-pole, 2.1-T wigglers.

SSRL Beam Line Infrastructure - Tom Rabedeau

SPEAR3 Beam Line UpgradesAnticipated Status when SPEAR3 Starts Operations

BL SPEAR3 compatible Status 1/04

front ends 500mA ok ok1 100mA ok Add. Work Pending2 100mA ok Add. Work Pending3 100mA ok Add. Work Pending4 down* Delayed 5 500mA ok ok6 500mA ok ok7 down* Delayed Until 6/048 100mA ok Add. Work Pending9 500mA ok ok

10 500 mA ok ok11 500mA ok ok

These plans are based on current funding projections. The project may be expedited if additional funding is identified, or delayed if anticipated funding does not materialize:

BL 5, 6, 9, 10, 11 should be completed in January 2004.

BL 1, 2, 3, 8 will need additional work to make them 500 mA, compatible with SPEAR3.

•BL 4, 7 will need additional work. BL 7 is anticipated to be completed ~6/04; BL4 in 2006, although BL4-2 will be 100 mA capable with new wiggler.