sps ua9 data taking run with lhc-type goniometer 31/07/2015 – collimation upgrade specification...

SPS UA9 data taking run with LHC-type Goniometer

31/07/2015 – Collimation Upgrade Specification Meeting #60Roberto Rossi

Daniele Mirarchi, Stefano Redaelli, Walter ScandaleSpecial thanks to EN/STI, BE/OP, BE/RF and BE/ABP for support during the

data taacking

R. Rossi - SPS UA9 MD with LHC Goniometer 2

Table of contents• Introduction• SPS July run overview• Procedure timeline• Performance of crystal on piezo-goniometer• Conclusions

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Introduction

SPS UA9 runs are used to test the principle of crystal-assisted collimation system.UA9 apparatus is placed in the LSS5 of the SPS where scintillators and BLMs are used to measure beam losses downstream any key device.

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Reduction Factor = AM losses

CH losses

AM

CH


July run overviewThis run was a kick-off of UA9 measurements in 2015. Update wrt the last year are:

• Installation of Piezio-Goniometer Prototype (same as the two installed in LHC)• Installation of CpFM Prototype• New read-out electronics (Wave Catcher) used for the first time to get the scintillators

signals• Special read-out COBRA card for CpFM. This electronics is suited for FFT analysis of

CpFM signals in the range [Hz-GHz]

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UNDERGROUND INSTALLATION

Piezo-Goniometer

CpFM

Other 3 runs this year


July MD overview

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• SPS has an issue with a quadrupole causing orbit shift -> scans are affected by spikes • Starting from this run BPM are used in online and offline analysis to detect the beam orbit

variation.


Procedure Timeline

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7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9 10

Beam Set-up

Operation with standard

goniometer

CpFM and Scintillators Set-up

LINAC Intervention

Piezo-Goniometer Operation

Piezo-Goniometer Operation

LHC Fill + Injection problems

CpFM and COBRA operations

Operation with standard

goniometer

Some stops during the run (intervention/problem/LHC fill) Anyway the scheduled program was fully completed


Piezo-Goniometer test - overview

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17 18 19 20 21 22 23 24 1 2

17 18 19

22 23 24 1 2

Instrumentation Alignemnt

Angular Scan Instrumentation Alignemnt

Angular Scan

CH orientation found

Angular Scan at different speed (2 and 0.5 urad/s) and stability test

Piezo LinearAlignemnt

Piezo LinearAlignemnt

• In both cases the alignment of the crystal last less than 15 min.• The angular scan to find Channeling (CH) orientation last more than two hour of operation.

expected orientation around -1800 urad, found at around 4200 urad (6mrad away)

15’ 15’


Piezo-Goniometer testPiezo-Goniometer is a prototype developed under the supervision of A. Masi (EN/STI).

• Fundamental test of the hardware for future LHC experiments:– two goniometers are already installed in the LHC– a laboratory test bench device has allowed to develop and test a sophisticated,

optimised control system– the goniometer installed in SPS was used for the first test with the beam during the data

taking in July• The alignment procedure was completed very quickly (less than 15’).• The scan to find the channeling orientation took longer then expected.

– The crystal alignment procedure completely different from the past:

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Old case Crystal aligned directly wrt the beam line

New case Crystal aligned wrt tank, and tank is aligned wrt the beam line (as LHC)


Piezo-Goniometer CrystalQMP39

o LHC-Type holder (titanium)o 4x5x30 [mm] (zxxxy)o Deflection angle ~160 urad

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Piezo-Goniometer scanFast angular scan performed at 2urad/s to find CH orientation

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Crystal @ 5σ Reduction factor = 4.38


Piezo-Goniometer test

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Crystal @ 4.37σTAL @ 8.2σ

Detailed angular scan performed at 0.5urad/s around CH orientation

lowest speed with mechanical goniometers 1urad/s

Reduction factor = 4.31


Piezo-Goniometer scanpropaedeutic test for angular stability during linear motion

– Crystal in channeling orientation retracted and inserted again of 10 mm– We observed that crystal was still in CH– Next step comparative analysis to evaluate the influence of angular oscillation due to linear

movement before and after system improvement (1st September MD)

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Angular stability with crystal fixed orientation

In particular the behaviour of this decreasing


ConclusionAchievements The Piezo-Goniometer is reliable enough for standard UA9 operation in

SPS Promising results for LHC test

Next Goal in SPS in view of the LHC test Test the upgrade made to increase the stability of rotational stage during

linear motion Test the reproducibility of the scan, knowing the crystal CH orientation

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sps ua9 data taking run with lhc-type goniometer 31/07/2015 – collimation upgrade specification...

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