Light Source Diagnostics. Hywel Owen ASTEC Daresbury Laboratory
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1 Light Source Diagnostics Hywel Owen ASTEC Daresbury Laboratory
2 This Talk Not a review of light source diagnostics Good summaries at EPAC/PAC/DIPAC, etc. J.Safranek (ICALHEPS 99) J.Clarke (EPAC 94) R.Hettel Instead: a collection of various thoughts on diagnostics
3 Optical Diagnostic Layout (SRS) Station 13.2 Optics Benches Dipole source - 5mrad Plane SiC Mirror nm Shielding Valve Mask From Dipole 13 SiC Mirror (120 ) TVM Primary Mirror Box (Station 13.1)
4 Very good for basic diagnostics and commissioning Main Mirror (Optical) Visible/uv wavelengths Resolution limit ~100 um 2 nd -generation spot sizes ~ um 3 rd -generation spot size ~ um SRS diagnostic beamline mirror Cope with heat loads by thermocouple and moving mirror
5 Simple Installed SR Monitor Simple, cheap No excuse for not having one! CLS Booster
6 Pinhole Camera (APS) CdWO 4 Scintillator imaged onto CCD
7 EBPM Resolution um resolution or better possible from EBPMs Depends upon current and required bandwidth Can have thermal effects (e.g. ~50 um at ALS) However, this is not the whole story Swiss Light Source digital BPM
8 BPM Mounts 2 nd -generation sources have BPMs fixed only to vessel (or none at all!) Get large movements. CLS EBPM fixed directly to girder
9 BPM Movement NSLS BPM Motion ESRF Feedback Also seen at other sources SRS, ALS Caused by heating, pressure from other components etc.
10 BPM Mounting Methods Quad BPM The ground moves too: ALS vertical >100um DIAMOND >100um expected seasonal (water content in 14m chalk/clay) SLS ~1mm seasonal change in C Magnet mount design can give lateral creep: ESRF (damping mounts) SRS >1mm! (frame mount + ageing floor) Survey errors (20-50 um typical on girder) Can add linear encoders SLS resolution ~0.5 um Experiment
11 Photon BPMs also have problems Tungsten Vane Monitors see edge of beam can t avoid dipole radiation sensitive to beam size changes with undulator gap Can map response with motion Developing energy-resolved TVM using hemispheric analysers Light seen by ESRF TVM
12 Girder Alignment (SLS) 5-point support with roller cams: >1mm in 5 deg. of freedom Software can automate movements Will also be used in DIAMOND
13 Girder Response Matrices (SLS)
14 Orbit Correction Using Girders Only theory so far
15 Hydrostatic Levelling Systems Optical triangulation sensor Windshield ESRF (Electronic) Problems with contamination mould etc. in water MAX-II (Optical) ~um resolution
16 Building and Accelerometer Mounts Jointed floor to stop wind on building shell affecting storage ring (CLS) (300 mm slab on thick glacial till) Accelerometer Mounts to measure transmission of vibration across joint Not tried yet
17 OTR Screens Screen Al on Mylar Installed monitor (CLS Transfer Line) Linear Fast response (sometimes too fast!) Narrow viewing angle can be a problem roughen surface? Can combine with fluorescent screens
18 Photon Counting to Measure Bunch Filling Pattern Photons AB302 Filter Wheel RS232 Peltier Cooler Input PMT Base 583 Disc. Timing Output Start Stop 457 TAC Positive Output LabVIEW TRUMP 8k MCA EISA Bus Local PC MCB Server Application Ethernet Remote PC LabVIEW RF Master Osc. (499.7 MHz) Orbit Clock Unit MHz Delay Input 584 Disc. Timing Output Negative Output Ratemeter Single NIM Crate +Detector Optics
19 How Photon Counting Works Takes around 60s to build good statistics No good for single shot or in damping ring!
20 Cleaning Bunches by Resonant Excitation Set frequency to vertical tune of parasitic bunches (~10 khz above main bunch) (SRS, ~20 ma main bunch current at 2GeV) Before Main Bunch After Counts ns -2ns -4ns Removal of Neighbouring Bunches (+2ns, -2ns and -4ns) Channel No Main Bunch Before After Counts ns Artefacts -106ns Removal of +106ns and -106ns contamination Channel No.
21 Streak Camera 2 ps resolution (500 fs at ESRF) Signal to noise (contrast ratio) around 1:10 3 cf. streaking electron beam down to 20fs About 200,000 dollars/euros
22 Typical Results (APS Multibunch)
23 Decoherence After Kick (APS)
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