TPC laser calibration system
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1 TPC laser calibration system Børge Svane Nielsen Niels Bohr Institute ALICE Technical Board, CERN, 18 February 2002 Table of Contents System Goals 1 2 Spacial and angular precision 11 Production, installation and alignment 12
2 System Goals System Goals Use of laser calibration system: Electronics testing Sector alignment Drift velocity measurement Drift distortions: temperature effects, space charge and ExB effects Goals for laser track layout and precision: 1 mm UV laser beams through most of TPC volume 1 5 mip equivalent ionization cross sector boundaries appropriately radial beams at different z and beam precision, production + installation: m beam precision, alignment: 200 m Technical principle: Wide laser beam ( 25 mm) intersected by 1 mm mirrors inside TPC Collaboration: Alexei Lebedev (STAR) can collaborate part-time micro-mirrors supplied from State Center Interphysica, Moscow 18 February 2002 TPC laser calibration system-1 Børge Svane Nielsen, NBI
3 Design of laser system: from laser to narrow beams Laser from Spectron Laser Systems. Special model: SL UPG Pulsed UV laser (Nd:YAG) energy per pulse: nm, upgradable to 180 mj pulse width: 10 ns, repetition rate: max 10 Hz telescopic resonator beam expander 9 mm 25 mm divergence mrad, pointing stability mrad (1 mm at 10 m) autotracking of 266 nm separator for temperature stability remote controllable Running at NBI. 18 February 2002 TPC laser calibration system-2 Børge Svane Nielsen, NBI
4 Laser hut and beam transport to TPC end-plates. 18 February 2002 TPC laser calibration system-3 Børge Svane Nielsen, NBI
5 18 February 2002 TPC laser calibration system-4 Børge Svane Nielsen, NBI
6 Beam transport on TPC end-plates, Shaft side 18 February 2002 TPC laser calibration system-5 Børge Svane Nielsen, NBI
7 Beam transport on TPC end-plates, Muon side 18 February 2002 TPC laser calibration system-6 Børge Svane Nielsen, NBI
8 Laser rods 18 February 2002 TPC laser calibration system-7 Børge Svane Nielsen, NBI
9 NBI Micro mirror bundle On order from Moscow Engineering School, State Center Interphysica. Specifications: 1 mm diam. quartz fibres, cut at mrad and coated for 266 nm bundles assembled of 7 micro-mirrors in cup,, all angles measured to, 0.05 mrad. Delivery: half in May 2002 half in June/July February 2002 TPC laser calibration system-8 Børge Svane Nielsen, NBI
10 Beam pattern R- Radial beams with strategic sector boundary crossings 18 February 2002 TPC laser calibration system-9 Børge Svane Nielsen, NBI
11 Beam pattern R-z 4 mirror positions in z Large span and uniform distribution in z Avoid crossing laser beams in TPC volume 2 or more sets of mirror z positions Beam steering: Beam monitors (cameras) in: laser hut entrance on TPC end-plate far end of one or several laser rods Active beam steering ( - ): laser hut entrance on TPC end-plate 18 February 2002 TPC laser calibration system-10 Børge Svane Nielsen, NBI
12 NBI Spacial and angular precision Spacial and angular precision Final alignment precision aim: x, y, z (mirrors) 200 m, (track angles) 0.1 mrad m space points Sources of misalignment: Mirror bundle misalignment: x, y, z,, Laser beam angles:, Other active/passive optics alignment is only to optimise the beam quality. Error sources in mirror positions relative to nominal: Mirror bundle production Installation of mirror bundles in laser rods Installation of laser rods in TPC x, y, z (mirrors) 200 m, (mirrors) Error sources in measured mirror positions: Measurement of mirrors in bundles: x, y, z 100 m, 0.05 mrad Measurement of mirror bundles in rods: x, y, z 100 m, 0.05 mrad Measurements of assembled rods: x, y, z 100 m, 0.1 mrad Measurements of installed rods in TPC: x, y, z 200 m 0.1 mrad (OK rods do not bend) 0.1 mrad (tough!!) Movements of outer cylinder, laser rods and mirror holders? 18 February 2002 TPC laser calibration system-11 Børge Svane Nielsen, NBI
13 Production, installation and alignment Production, installation and alignment Micro-mirror and rod production: Micro-mirror production and measurement as for STAR (in Moscow) Assembly and measurement of rod pieces at NBI Full rod assembly and measurement at CERN TPC assembly: Rod installation: assure mechanically to or better Alignment measurements on assembled TPC: look through rods from end-plate to end-plate Measure some spots from HeNe laser inside TPC before chambers Optics and laser control and monitoring: Detailed design and production in parallel with rod production Production of optics components industrial Production of mechanics and assembly at NBI Installation and alignment on TPC end-plates Laser hut and beam transport in surface test area Laser hut and beam transport in ALICE 18 February 2002 TPC laser calibration system-12 Børge Svane Nielsen, NBI
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