# Presentation: 842994

## High heat load beamline components 

**	****• ****beam defining aperture****	****Glidcop: W 16 max. stress 24 ksi. W 11 max stress 32 ksi. **
**	****	****NOTE:  yield for annealed material is 37 ksi. For cold rolled material yield ****	****	****is < 50 ksi. ESRF guidelines for compressive stress indicate (infinite) ****	****	****lifetime stress limit of 123 ksi**
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**	****• ****photon stop****	****Glidcop:  W16 max. stress 28 ksi  (25):  lower in main cooled area**
**	****	****W11 max stress 37 ksi (33):**
**	****• ****carbon filter aperture****	****Glidcop:  W16 max. stress 25 ksi: W11 max stress 33 ksi**
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**	****• ****carbon filter****	****polycrystalline carbon, 9 foils of 21 microns, 9 of 32 microns (2520 and ****	****	****3770 micro gm /cm^2 respectively, density 1.2 gm/cm^3)**
**	****	****engineering notes document FEA on 10 filter design; 1st filter temp 1620 ****	****	****C, last filter temp 1320 C. Hoyer M6043 EN, conservative max. temp is ****	****	****1675 C. Radiation scaling leads to max. 1752 C and min 1431 C. Increase ****	****	****in power requires thinner upstream foils and thicker downstream foils. ****	****	****Optimum foil thickness will bring max. temp below Hoyer threshold.  ****	****	****Needs radiation cooling FEA study for optimum design. If FEA reveals a ****	****	****problem, then we can use the Cornell conductively cooled design.**
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**High heat load beamline components**

## High heat load beamline components 

**	****• ****M1 mirror****	****recomputed (Howells analytic form for mapping distortion) W16 slope ****	****	****error. 1 sigma is 0.28 micro-rads. Angular size of source (incl. source ****	****	****	****depth) is 25 micro-rads. Scaling to W11 will not cause a problem.**
**	****• ****1st mono crystal****	****recomputed****	****W16 slope error. 1 sigma is 18 micro-rads: p-p is 62 ****	****	****	****microrads!!  Note that error is doubled on reflection and propagated over ****	****	****10 m. There are 2 effects**
**	****	****a) bending greater than the rocking width (13 micro-rads 1 sig) reduces flux**
**	****	****- W16 1 sigma bend = 18 micro-rads, W11 = 24 microrads**
**	****	****- in both cases flux is lost**
**	****	****b) bending greater than angular source size (up to rocking curve limit) ****	****	****causes defocusing. **
**	****	****- W16 & W11 1 sigma bend greater than angular rocking width**
**	****	****- effective image size caused by bending 600 microns, close to observed**
**	****	****## For W16, much better cooling is needed, independent of W11**
**	****	****## MCF staff realize there is a problem (Cork) and are examining cryocooling**
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**High heat load beamline components**

## Power and Power Density 

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**Power and Power Density**

**- ratio of B L for W11.4 / W16 = 1.03**
**- note if B is constant, more poles doesn’t increase total power**
**	****- K reduces to compensate, ie, angular aperture decreases**

**- ratio of B N for W11.4 / W16 = 1.33**

## Flux of W16 and W11.4 at 12.6 keV 

**Flux of W16 and W11.4 at 12.6 keV**

- W11.4, 53 poles

- W16, 37 poles

- - Beamline 5.0.2:  -0.75 to + 0.75 mrads,  W11.4 / W16 flux = 1.24
- - Beamline 5.0.1:  +1.05 to +3.75 mrads,  W11.4 / W16 flux = 1.22