SPECTRAP - GSIprogress report and status

overview

Zoran Anđelković

Initial problemsInitial problems

=> The best option was to disassemble the whole system piece by piece

• View ports were not in line• No vacuum could be established• We had no idea how the whole system looked inside• The trap had to be changed anyhow

Zoran Anđelković

Stage I – dismantlingStage I – dismantling

Liquid nitrogen dewar

Liquid helium dewar

Outer (70K) shield

Inner (4K) shield

Mounting “can”

SC magnet coils

trap

4K elec.

ions

Zoran Anđelković

Removing the outer shieldRemoving the outer shield

Supported by a small crane

Positioning spokes

Zoran Anđelković

Removing the LN dewarRemoving the LN dewar

Zoran Anđelković

Broken bellows on the LN dewarBroken bellows on the LN dewar

Zoran Anđelković

LN dewar and inner shield overviewLN dewar and inner shield overview

Zoran Anđelković

Removing the inner shieldRemoving the inner shield

Some broken electronics parts

Broken support disc of the inner shield

+ other smaller damages

Zoran Anđelković

The “old” trap & 4K electronicsThe “old” trap & 4K electronics

a hyperbolic trap with two “pre-traps”

amplifier and (broken) coil

Zoran Anđelković

Removing the LHe dewarRemoving the LHe dewar

Zoran Anđelković

Intermezzo I – the HITRAP platformIntermezzo I – the HITRAP platform

... and the SPECTRAP setup on it

future beam line

Zoran Anđelković

Stage II – repaired?Stage II – repaired?

No, still vacuum problems~ 6·10-2 mbar

Zoran Anđelković

Leak (hole) searchLeak (hole) search

• pumping test of the dewars• found a bad weld on the LN dewar• no further (big) leaks detected

Zoran Anđelković

Intermezzo II – the “new” trapIntermezzo II – the “new” trap

Trap design modified for purposes of SPECTRAP

Zoran Anđelković

Further modificationsFurther modifications

new electronics development with help of Stahl electronics

additional mirror & lens pair

Zoran Anđelković

Next stepsNext steps

• Put the system (again) back together and check the vacuum• Add the electronics and optics to the trap• If the vacuum should be OK – cool down (LN + LHe) and energize the SC magnet• Think of installing a Faraday cup under the trap• Shoot some (any) ions through• Make simulations of ions inside the trap• Be optimistic!