T-980 Crystal Collimation Recent Results

T-980 Collaboration:

FNAL, SLAC, BNL, CERN, PNPI, IHEP, INFN D. Still

CM14

April 27, 2010

C14 April 27 , 2010 - D. Still 2

Overview:

•Brief T980 History and Purpose

•Experimental Setup

•Initial results from Multiple Volume Reflection (MVR)

•Comparison of MVR results with simulations

•Summary

C14 April 27 , 2010 - D. Still 3

Explanation of Crystal Channeling

Ray Fliller- Halo 03

2

5

1

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Vertical Multi-Strip OrientationThis orientation is opposite of what was calculated andestimated.

Name: MS-08-09Bend: 63urad (VR)8 strips

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Overview:

•Brief T980 History and Purpose

•Experimental Setup

•Initial results from Multiple Volume Reflection (MVR)

•Comparison of MVR results with simulations

•Summary

C14 April 27 , 2010 - D. Still 6

T980 Setup in Tevatron E0 for 2009-2010

Bent Crystal

E03H Collimator

Channeled Beam Path

Volume Reflected Beam (VR) Path

F172H Collimator

B0

E0

F1

D0

Vertical 33.115 m23.731 m

27.8 m

F1 detectorsAbort gap (T:F1LABT)Bunch (T:F1LBNC)

Pin detector (T:LE0PIN)

DetectorsAbort gap (T:E1LABT)Bunch (T:E1LBNC)

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New Vertical Goniometer

Up and Downstream Laser angle measurement instruments

Up and DownstreamMotion control and LVDT

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New Characterized Crystals

Name: O-BNL-02Bend: 410uradMiscut: 1600 urad

Name: MS-08-09Bend: 63urad (VR)

Name: O-05-09Bend: 360uradMiscut: 120urad

Installed Ver Dnstrm goniometerInstalled Hor goniometer

Installed Ver Upstrm goniometer

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Goniometer Installations over Summer 09 Shutdown

Newly built and installed (Summer 2009) Vertical goniometer at E0.It is ~ 4m upstream of the Hor. one. Ver. goniometer houses old O-shaped crystal (reversed for negative miscut) and multi-strip crystal.

Modified horizontal goniometer. Replaced old large-miscut angle O-shaped crystal with new small miscut O-shaped during Summer 2009.

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Vertical position across E0

ver crystal

e03v coll

-8

-6

-4

-2

0

2

4

6

8

0 10 20 30 40 50 60 70

Ring Location (m)

(mm

)

Location of Vertical multi-strip CH & VR beam

Bent Crystal

E03v Collimator

Volume Reflected Beam (VR) Path

Channeled Beam (CH) Path

F172v Collimator

E0

F1

D0

Displacement ofVR beam at E03Collimator is +1.76mm

Vertical position at F172 collimator

F172 Coll

F173 targetF17 spool

F171 coll

-2

0

2

4

6

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1290 1295 1300 1305 1310 1315

ring location (m)

(mm

)

Displacement (mm) F17 spool

F171 coll F172 Coll

F173 target F18 spool

Displacement in channel (mm) Displacement in V.R (mm)

Displacement ofCH beam at Collimator is +6.0 mm

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Overview:

•Brief T980 History and Purpose

•Experimental Setup

•Initial results from Multiple Volume Reflection (MVR)

•Comparison of MVR results with simulations

•Summary

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MS-08-09 Characterizations at Cern North Area RD22 H8, 400 GeV/C protons

Name: MS-08-09Bend: 63urad (VR)Bend: 200urad (CH)8 strips

Crystal angle

AM

CH

VR

AM

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Vertical Multi-strip Angular scan2uard Angle Scan MS-08-09 crystal 3-17-2010

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

450 500 550 600 650 700 750 800 850 900 950

Crystal Angle (urad)

No

rmil

ized

Lo

ss

Loss @ F17 coll - CH-(t:f1lbncn) Loss @ E03 coll - VR-(t:le033n)

Loss @ crystal-(t:le0pin)

CHVR

AM

E03V and F172VCollimators in at max catch

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VR beam collimated w/ E03V is consistent (only if F17 is in)

(Analysis by Vladimir Shiltsev)

VR beam displaced 1.76mm from corewith a sigma of 1.122.F172 collimator is in at max catch.

1.76mm displacement Corresponds to VR angle:θ=1.76mm/28m =63 urad

Cern H8 measured angle:93 urad/ sqrt(980/400)=59 urad

Width is ~39 urad that’s wider than expected SPS: 18*sqrt(980/400)=29 urad .

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CH beam collimator scan w/ F172 collimator - (E03 is in)

Angle of Bend for CH Corresponds to:θ=1.87mm/29m=65 urad

instead of 200 urad

Width is ~28 urad that’s narrower? than expected

(Analysis by Vladimir Shiltsev)

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MS Crystal Angle Scan: LE0PIN Loss rate

Calculated Efficiency=90%If CCVAD calibration coefficient is 1.24

θ=(CCVAD-500) *1.24

Total width ~550 uradHigh Eff width ~100 urad

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Overview:

•Brief T980 History and Purpose

•Experimental Setup

•Initial results from Multiple Volume Reflection (MVR)

•Comparison of MVR results with simulations

•Summary

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Simulated Data – S. Drozhdin “Beam Collimation in the Tevatron Using Multi-strip Protvino Channeling Crystal”

Vertical 8 Mult-strip Simulation

-5000

0

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10000

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20000

25000

-0.15 -0.1 -0.05 0 0.05 0.1 0.15 0.2 0.25

Crystal Angle (mrad)

Lo

st

0

200

400

600

800

1000

1200

Lo

st C

ryst

al

sim lost colE03 lost colF172 lost DLAMBF0 lost crystal

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Qualitative Look at Experimental vs. Simulated Data

MS-08-09 March 17,2010 dataSimulated vs real data for F172 Losses

0

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T:F1LBNC lost colF172

VR Beam collimated at E03V

CH beam collimated at F172V

CH peak also aligns

MS-08-09 March 17,2010Simulated LE033 vs Real Data

0

5000

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400 500 600 700 800 900 1000

crystal angle (urad)

sim

LE

033

0.4

0.6

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1

1.2

1.4

1.6

LE

033

(vo

lts)

sim lost colE03 T:LE033

Need better understanding of these areas.

Align

Good

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Losses at Crystal are not consistent with Simulation

MS-08-0 March 17, 2010 dataSimulated vs Real data for Loss at Crystal

0

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Crystal Angle (urad)

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T:CCLABT T:LE0PIN lost crystal

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Experimental Data does not have loss at F0 Lambertson

MS-08-09 March 17,2010 dataSimulated vs real data for lambertson loss

-0.006

-0.004

-0.002

0

0.002

0.004

0.006

0.008

0.01

300 400 500 600 700 800 900 1000

Crystal angle (urad)

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T:LMF0L2 lost DLAMBF0

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What is missing from Real data to Simulation????? Are there process that are not taken into account in

simulation? Multi-turn effects, crystal problems, crystal inefficiencies, skewed planes, beam loss at additional apertures, physics missing from simulations?????

The problem seems to be most wrong in the AM part of crystal, then next boundaries between VR and CH.

Went back to Drozhdin paper to look in detail. Noticed that simulations are done for 20 turns. After talking with Sasha, once a particle is lost it is gone. Therefore number of particles is shrinking and it takes more (many more ) turns for a particle to be lost in the AM part. Therefore, we are not really estimating real data to simulation in area not in CH or VR.

Sasha reran simulation to take AM with circulation beam.

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Modified original simulations to include estimate for multi-turn losses at amorphous angles

Simulations redone to take into account AM multiturn effect

-0.2

0

0.2

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0.6

0.8

1

-0.1 -0.05 0 0.05 0.1 0.15 0.2 0.25

crystal angle (mrad)

Lo

ss

lost crystal lost colE03 lost colF172 lost DLAMBF0

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Experimental and simulated losses at the crystal

MS-08-0 March 17, 2010 dataSimulated reworked vs Real data for Loss at Crystal

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Crystal Angle (urad)

No

rma

lize

d L

os

s

T:LE0PIN lost crystal lost crystal

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Experimental and simulated losses downstream E03 collimator

MS-08-09 March 17,2010Simulated (reworkd for AM) LE033 (E03V collimator) vs

Experimaental Data

0

0.2

0.4

0.6

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1

450 500 550 600 650 700 750 800 850 900 950

crystal angle (urad)

No

ma

lize

d l

os

s

T:LE033 lost colE03 lost colE03

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Experimental and simulated losses downstream of F172 collimator

MS-08-09 March 17,2010 dataSimulated (reworked for AM) vs. experimentl data for F172

Losses

0

0.1

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450 500 550 600 650 700 750 800 850 900 950

Crystal angle (urad)

No

rili

zed

Lo

ss

T:F1LBNC lost colF172 No F0 Lam loss -lost colF172

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Summary Demonstrated CH and VR with the vertical multi-strip crystal MS-08-09 at

980Gev.

Collimator scans measure the VR angle at E03V at ~ 63urad in good agreement with estimated crystal VR bend but some error from 59urad characterized at Cern H8.

Collimator scans measure the CH angle at F172Vat ~ 65urad instead of H8 results of 200urad. Uncertain the cause of this error. In both VR and CH scans, both E03 and F172 need to be in to produce reasonable results.

Qualitative comparison of experimental data and simulated data has better agreement when better multi-turn beam loss estimates for crystal angles in the amorphous angles were applied. Further simulations will be run with increased number of turns.