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T980 Crystal Collimation 1 st HiLumi LHC / LARP Collaboration Meeting CERN November 16-18, 2011 Nikolai Mokhov and Dean Still Fermilab Accelerator Physics Center US LARP

T980 Crystal Collimation

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US LARP. Fermilab. Accelerator Physics Center. T980 Crystal Collimation. 1 st HiLumi LHC / LARP Collaboration Meeting CERN November 16-18, 2011. Nikolai Mokhov and Dean Still. OUTLINE. 2011 Layout and Crystals Pixel Detector Special Run May 16-27: - PowerPoint PPT Presentation

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Page 1: T980 Crystal Collimation

T980 Crystal Collimation

1st HiLumi LHC / LARP Collaboration Meeting CERN

November 16-18, 2011

Nikolai Mokhov and Dean Still

Fermilab Accelerator Physics Center

US LARP

Page 2: T980 Crystal Collimation

HL-LHC/LARP CM1 - CERN, Nov. 16-18, 2011 T980 Crystal Collimation - N. Mokhov 2

OUTLINE

2011 Layout and Crystals

Pixel Detector

Special Run May 16-27:

• O-shaped, MS-8 and MS-16 Crystal Studies

• CH and VR Beam Imaging with Pixel

Page 3: T980 Crystal Collimation

T980 Crystal Collimation - N. Mokhov 3

Name of the crystal

CH plane,

deflection type

Origin

Bend angle/VR

angle, urad

Size along

the beam, mm

Miscut angle, urad

Displacement of particles at E03 (CH/VR), mm, simulated

Displacement of particles at F172 (CH/VR), mm,

simulated

Maximum Efficiency,

%

O-BNL-02(110),

horPNPI 410/9 5 1600 -10/0.43 25.55/-1.13 75 (CH)

O-05-09(110),

horPNPI 360/16 5 120 -8.13/0.39 22.44/-1.06 60 (CH)

MS-08-09(111), vert

IHEP200 and 8/strip

0.9 small 5.04/-1.56 -6.58/2.07 70 (VR)

MS-16-11(110), vert

INFN250 and

13.5/strip1/strip 600 6.3/-5.36 -8.23/7.11

QM-01-10(111), vert

PNPI 120/15 2 50 2.9/-0.37 -3.95/0.49

Previous Results for T-980 Crystals

HL-LHC/LARP CM1 - CERN, Nov. 16-18, 2011

Page 4: T980 Crystal Collimation

HL-LHC/LARP CM1 - CERN, Nov. 16-18, 2011 T980 Crystal Collimation - N. Mokhov 4

Goals for 2011

In February, 2011 installed 2 new crystals in the vertical goniometer MS-8 and a MS-16.

Also installed a 2 plane pixel upstream of the E03 collimator to image beam effected by crystals.

T980 study period:Tevatron incorporated 2 weeks of studies which allowed ~ 40 hours of

dedicated studies for T980.Studies were held May 15 – 27 and hosted 3 visitors. 2 from CERN and 1

from INFN.

T980 study period plans:Commission horizontal and vertical pixel detector.Image horizontally channeled beam on the horizontal pixel detector.Image vertically multiple volume reflected (MVR) beam on the vertical

pixel detector.Scan and Characterize a new Multi-strip (MS-16) crystal and look at

efficiencies.Demonstrate 2 – plane crystal collimation using a vertical MS-8 using

MVR and horizontally using channeling from an O-shaped crystal.

Page 5: T980 Crystal Collimation

5

Goniometer moves and rotates a crystal to a precise (~2 rad) angle Crystal inserted at 5 Collimators inserted at (6-7) to intercept CH and VR particles Loss monitoring system: PIN diode, BLM, Scintillating paddles 2-plane pixel telescope to see CH and VR beam profiles on E03

T980 Crystal Collimation - N. Mokhov

T-980 Layout at E0

HL-LHC/LARP CM1 - CERN, Nov. 16-18, 2011

Page 6: T980 Crystal Collimation

HL-LHC/LARP CM1 - CERN, Nov. 16-18, 2011 T980 Crystal Collimation - N. Mokhov 6

New Ferrara Crystal MS-16F2 (1)

•Total number of strips: 16• Interferometric characterizations: 13 strips are aligned within 80 μrad.• Length of each strip along the beam: 1 mm• Transversal thickness of each strip: 0.3 mm• Anticlastic curvature radius : 4.0 m• Max baking temperature: 100 °C• Miscut angle: 80 μrad• Crystal and holder do not require cleaning

•Total number of strips: 16• Interferometric characterizations: 13 strips are aligned within 80 μrad.• Length of each strip along the beam: 1 mm• Transversal thickness of each strip: 0.3 mm• Anticlastic curvature radius : 4.0 m• Max baking temperature: 100 °C• Miscut angle: 80 μrad• Crystal and holder do not require cleaning

Replaced damaged MS-16F1in vertical goniometer inMarch 2011

θVR

θVR

θVR

Page 7: T980 Crystal Collimation

HL-LHC/LARP CM1 - CERN, Nov. 16-18, 2011 T980 Crystal Collimation - N. Mokhov 7

Ferrara Crystal MS-16F2 (2)

Predictions for Tevatron:= 72.3 rad, = 94.8%

Page 8: T980 Crystal Collimation

Two IHEP Crystals

IHEP 8-strip MS-08-09, small miscut.Bend: 63rad (VR), 200 rad (CH).In vertical goniometer.Studied in 2010, good performance.Then, replaced with (damaged) MS-16F1.March 2011: re-installed instead of QM.

HL-LHC/LARP CM1 - CERN, Nov. 16-18, 2011 8T980 Crystal Collimation - N. Mokhov

IHEP O-shaped O-05-09Bend: 360 rad, Miscut: 120 radIn horizontal goniometer

Page 9: T980 Crystal Collimation

HL-LHC/LARP CM1 - CERN, Nov. 16-18, 2011 T980 Crystal Collimation - N. Mokhov 9

Pixel Telescope to Track CH & VR Particles

•Installed in front of E03 collimator•3 telescoping pixels per plane•Supported by Ethernet Networking

•Installed in front of E03 collimator•3 telescoping pixels per plane•Supported by Ethernet NetworkingResolution 7-8 m

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HL-LHC/LARP CM1 - CERN, Nov. 16-18, 2011 T980 Crystal Collimation - N. Mokhov 10

E0 Pixel Detector

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HL-LHC/LARP CM1 - CERN, Nov. 16-18, 2011 T980 Crystal Collimation - N. Mokhov 11

O-05-09 Characterization

-1200 -1000 -800 -6000

25

50

75

100

125

150T

:CC

LA

BT

T:E0CCA2

CCLABT losses Fitting function

CH peak = 1023 uradCH 2sigma = 32 uradFWHM (CH+VR) =250 uradReduction in rates CH = 9Reduction in rates VR = 2.6

FWHM = 250 urad

Page 12: T980 Crystal Collimation

HL-LHC/LARP CM1 - CERN, Nov. 16-18, 2011 T980 Crystal Collimation - N. Mokhov 12

E03H Collimator Scan with O-05-09

Displacement from core: -4.65mm

Page 13: T980 Crystal Collimation

HL-LHC/LARP CM1 - CERN, Nov. 16-18, 2011 T980 Crystal Collimation - N. Mokhov 13

First Image of CH Beam from O-05-09

T980 collaborators from FNAL, CERN and INFN

T980 collaborators from FNAL, CERN and INFN

May 18, 2011

Page 14: T980 Crystal Collimation

HL-LHC/LARP CM1 - CERN, Nov. 16-18, 2011 T980 Crystal Collimation - N. Mokhov 14

Analysis of Pixel Data

O-05-09 Displacement at E03 vs crystal angle

y = 0.0234x + 22.163

-2.5

-2

-1.5

-1

-0.5

0-1050 -1040 -1030 -1020 -1010 -1000 -990 -980

14

Page 15: T980 Crystal Collimation

HL-LHC/LARP CM1 - CERN, Nov. 16-18, 2011 T980 Crystal Collimation - N. Mokhov 15

E0 MVR

Multi-Strip Bent Crystal

Multi-Strip Bent Crystal

E0 PixelDetector

E0 PixelDetector

E03 CollimatorE03 Collimator

Circulating BeamCirculating Beam

Multiple VolumeReflected (MVR) Beam

Multiple VolumeReflected (MVR) Beam

Page 16: T980 Crystal Collimation

HL-LHC/LARP CM1 - CERN, Nov. 16-18, 2011 T980 Crystal Collimation - N. Mokhov 16

MS-8 Strip results

2uard 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) -400 -200 0 200

0.0

0.2

0.4

0.6

0.8

1.0

No

raliz

ied

Lo

ss

CCVAU

Normalize to [0, 1] of "CCLBNC" Normalize to [0, 1] of "LE033" Normalize to [0, 1] of "F1LBNC"

Crystal Angle (urad)

Data from 5-23-2011A2

2010 results 2011 results

Page 17: T980 Crystal Collimation

HL-LHC/LARP CM1 - CERN, Nov. 16-18, 2011 T980 Crystal Collimation - N. Mokhov 17

Page 18: T980 Crystal Collimation

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Results from Attempt to Scan MS-16

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Page 21: T980 Crystal Collimation

HL-LHC/LARP CM1 - CERN, Nov. 16-18, 2011 T980 Crystal Collimation - N. Mokhov

SUMMARY

• O-shaped and 8-strip crystals worked well in the last studies at Tevatron. Estimated channeling efficiency of O-shaped crystals is 65-75%, volume reflection efficiency of 8-strip crystal is 70%.

• Horizontal pixel worked well, while vertical pixel had too many dead pixels to resolve MVR from MS-8.

• Results to characterize MS-16 are inconclusive because of time needed to diagnose that the length of crystal and motion of goniometer produce losses that are difficult to untangle.

• Results of the two-plane measurements are also inconclusive - setup time is extensive & comparison of loss signals are subtle - more time is needed to further study.

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