Bent Crystal Results to Bent Crystal Results to DateDate

Feb 22, 2007Feb 22, 2007

D. StillD. Still

Summary of the Crystal Summary of the Crystal Studies:Studies:

Find where the new strip type crystal can Find where the new strip type crystal can channel in preparations for visitors this next channel in preparations for visitors this next week.week.

To date used 8 EOS for 15 hours of studies To date used 8 EOS for 15 hours of studies in attempt to find the channel.in attempt to find the channel.

Changed the procedure in order to reduce Changed the procedure in order to reduce noise and have some confidence that we noise and have some confidence that we could find the channel.could find the channel.

The Plan this Week:The Plan this Week:

Finish scanning the 8 mrad angular range of inchworm.Finish scanning the 8 mrad angular range of inchworm.

Investigate anything that looked like channeling.Investigate anything that looked like channeling.

8 mrad Angular Inchworm range

This is the signature we are looking for

Scanned last weekScanned this week

Looking for the channelLooking for the channelPossible channel CCIW = -28.2 mils

Feb 19, 2007 data 2 urad steps, Colls out, E03H in

0

500

1000

1500

2000

2500

3000

3500

4000

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

relative angle (urads)

Lo

sses

(h

z)

t:le033c c:lostpc t:le0pin

20 per. Mov. Avg. (t:le033c) 20 per. Mov. Avg. (t:le0pin) 20 per. Mov. Avg. (c:lostpc)

Channel SignatureChannel Signature

Possible channel CCIW = -28.2 milsFeb 19,2007 data 2urad steps, Colls out, E03H in

1000

1500

2000

2500

3000

3500

4000

0 50 100 150 200 250 300 350 400

relative angle (urads)

Lo

sses

(h

z)

t:le033c c:lostpc t:le0pin

20 per. Mov. Avg. (t:le033c) 20 per. Mov. Avg. (t:le0pin) 20 per. Mov. Avg. (c:lostpc)

154292138 urad

channel

Could not Confirm Could not Confirm ChannelingChanneling

Rescan to confirm channel at CCIW = -28.2 milsfrom data on Feb 19,2007

0

1000

2000

3000

4000

5000

6000

7000

-30 -29 -28 -27 -26 -25 -24 -23 -22 -21

E0CCIW inchworm (mils)

LE

0PIN

BL

M

(hz)

t:le0pin 10 per. Mov. Avg. (t:le0pin)

Should have seen channeling but only saw large losses.

Maybe due to beam motion, angle does Not repeat?

Beam on Feb 20 different than Previous store. Crystal and E03HDid not go in as far.

Previous EOS

FEB 20 EOS

The Plan for this next week:The Plan for this next week: Y. Chesnokov arrived Tue and has sat in for some EOS.Y. Chesnokov arrived Tue and has sat in for some EOS.

W. Scandale, M. Foririn, V. Guidi, S. Sawada arrived W. Scandale, M. Foririn, V. Guidi, S. Sawada arrived yesterday.yesterday.

We hope to get at least 2 more EOS studies to finish We hope to get at least 2 more EOS studies to finish the entire scan of angular range at 2urad step.the entire scan of angular range at 2urad step.

We hope to rescan the area that we thought we found We hope to rescan the area that we thought we found channeling to see if we can confirm channeling.channeling to see if we can confirm channeling.

If no channeling can be found after 2 EOS studies, If no channeling can be found after 2 EOS studies, access to verify crystal bend angle. T. Johnson is access to verify crystal bend angle. T. Johnson is building a laser jig. Figure out the problem.building a laser jig. Figure out the problem.

If can confirm channeling, request every EOS for next If can confirm channeling, request every EOS for next week to finish the study which is demonstrate halo loss week to finish the study which is demonstrate halo loss reduction with bent crystal compared to tungsten reduction with bent crystal compared to tungsten target.target.