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EMMA Extraction

EMMA Extraction. Bruno Muratori. Extraction (07/03/11). Going clockwise towards extraction Yellow = Inj. Kicker1 Pink = Ext. Kicker1 Green = Ext. Kicker2 Magenta = beam Action of injection kicker too early to be seen Magenta spikes = turns Effect of extraction clearly visible

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EMMA Extraction

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  1. EMMA Extraction Bruno Muratori

  2. Extraction (07/03/11) • Going clockwise towards extraction • Yellow = Inj. Kicker1 • Pink = Ext. Kicker1 • Green = Ext. Kicker2 • Magenta = beam • Action of injection kicker too early to be seen • Magenta spikes = turns • Effect of extraction clearly visible • Image seen on first YAG screen in extraction / diagnostic line  • Extract at every turn !

  3. Problems … • Cannot reach YAG-02 or any after it … • Cannot even reach second BPM … • Septum aperture clearly seen

  4. Details • We see beam on BPM-01 • Beam centred (+/-) on YAG-01 • Tried many (though not all …) combinations of quads on & off BPM-02 YAG-01 & SLIT-01 BPM-01 Possible trajectory YAG-02 EMMA 3 correctors located here – two vertical & one horizontal

  5. Possible solutions • BPM-02 not working correctly • BPM-01 & 02 changed at source for next run • SLIT-01 somehow in the way • Slit moving when light on YAG-01 & it is out so this should not be the problem - checked • All YAGs have metallised coating on one side • Could it be the wrong way around ? To be checked • Obstruction in the beam pipe ? • Only extraction line, could open up - to be checked • Quad scan on YAG-01 & re-match from there ? • Quadrupole misalignment ? Other ?

  6. Extraction set-up (1) • K1 & K2 occur at time t1 • Revolution time ~ 55 ns • Orbits → outside as energy increases • Set 18.5 MeV/c equivalent first (higher ?) • Make sure 18.5 MeV/c set-up optimised • Set extraction kickers (K3 & K4) and septum to: • Time t1 + ~ 25 × 55 / 42 ns + N × 55 ns • Pick good setting with many turns (~ 50 or more) • Try several other values of N • Set extraction line at 12 MeV/c

  7. Extraction set-up (2) • Look on YAG23 to make sure beam towards outside as expected • Change septum & kicker strengths until something is seen on YAG-01 in extraction • Make sure beam as centred as possible down extraction line • Look at YAG-02 in extraction • Do not accelerate at first • Repeat for many equivalent energies (10 – 20 MeV) & extract to 12 MeV extraction line • Save settings throughout & compare to model

  8. Extraction set-up (3) • Last BPM in injection line currently used as trigger so, from LeCroy scope, re-cable and: • Set timing of K1 with this BPM as trigger then • Use K1 as trigger for extraction • Set the timing of the extraction septum by: • Ch 1: Injection septum, Ch 2: Extraction septum • Then: • Ch 1: K3, Ch 2: K4, Ch 3: BPM E23, Ch 4: K2, Aux : K1 • I have been told there are five (already labelled) cables available: 3 for extraction magnets & 2 spares

  9. Extraction set-up (4) • Extraction with acceleration: • Set 12 MeV/c in extraction line as before • Set cavities to right crest & zero volts • Put bunch in bucket • Extract beam as before (1/2 turn & multi-turn) • Look at YAG-01 in extraction line • Slowly increase cavity volts until bunch leaves YAG-01 • Set 18.5 MeV/c in extraction line • Estimate number of turns required to achieve this • Inject real 12.5 MeV/c beam • Extract with YAG-01 & then YAG-02

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