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

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

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


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.

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


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


Ferrara Crystal MS-16F2 (2)

Predictions for Tevatron:= 72.3 rad, = 94.8%

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


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


E0 Pixel Detector


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


E03H Collimator Scan with O-05-09

Displacement from core: -4.65mm


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


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


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


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




Results from Attempt to Scan MS-16


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.

2121

T980 Crystal Collimation

Documents

plane crystal collimation

e03t980 crystal collimation

49t980 crystal collimation

crystal studiesch

rad crystal

mrad angle crystal

oshaped crystal

new ferrara crystal