Chlopik, A.

Gerhardt, A.

Kesik, G.

Lühning, J.

Orth, H.

Trzcinski, A.

Zwieglinski, B.

GSI Repository

Slow-control system for the Hydrogen Cluster-Jet Test Facility at GSI ∗B. Zwieglinski1, A. Chlopik1, A. Gerhardt2, G. Kesik1, J. Lu¨hning2, H. Orth2, and A. Trzcinski11NCBJ, Warsaw, Poland; 2GSI, Darmstadt, GermanyThe present Hydrogen Cluster-Jet Test Facility at GSIhas its origin in FERMILAB as a target in the E760/E835experiment [1]. After dismounting and installation atGSI in the laboratory specially adapted for working withflammable gases, it is reinstated in its cluster-jet operationcapability, serving in the same time as a testing ground formany elements of the future PANDA cluster-jet target [2].We refer in this note to some results obtained in the courseof development of its slow-control system.The whole target system is foreseen [2] to be drivenusing National Instruments (NI) hardware and software,in the well-known LabVIEW environment. This can beachieved using essentially three elements: a PC, a pro-grammable logic controller and the software that runs onboth. The programmable logic controller to drive thePANDA target system is the NI CompactRIO. It com-bines an industrial real-time controller and reconfigurablefield-programmable gate array (FPGA) chassis intended forindustrial machine control and monitoring applications.Soon after reinstallation of the Facility at GSI a cRIO-9074 with a few I/O modules have been installed, thuspermitting experimenting with the slow-control of its vac-uum and hydrogen-flow subsystems. An ultrapure hydro-gen is supplied to the nozzle of the cluster-jet generatorthrough a heated Pd-cell [Resource Systems Inc., mod.RSD-75]. This purifier requires that the Pd-alloy barrier isnever heated or cooled in the presence of hydrogen. There-fore, for example, the ’turn-on’ procedure evolves throughthe following operations performed step-wise:• evacuation of the crude and pure gaslines to assurethat no hydrogen is inside the Pd-filter,• evacuation of the inlet gasline to the nozzle and thenozzle chamber,• turning-on heating and setting the proper temperatureof the Pd-filter,• setting the proper pressure and flow-rate of the pureH2 through the nozzle.After completion of this stage, the system can be operatedin a stable mode under the control of cRIO. Turning it offstarts with evacuation of the crude and pure gaslines to re-move traces of hydrogen from the Pd-filter, next takes placethe evacuation of the inlet gasline to the nozzle and thenozzle chamber, afterwards the Pd-filter is purged by vent-ing with nitrogen and its heating can be turned-off. The∗Work supported by HadronPhysics3 - Transnational Access to GSI:Project SlowContr/Zwiegl.Figure 1: Vacuum devices of the cluster-jet beam dump servedby the slow-control system.above listed elementary operations have been merged intotwo procedures within which they are executed automati-cally by the c-RIO. A nice GUI has been prepared to watchchanging states of the system as it evolves in time on thePC screen .An arrival of the cluster-jet beam dump from INFN-Genova marked a new milestone in the Facility’s activity.The PANDA cluster-jet beam-dump features three differ-entially pumped chambers, each chamber pumped with apair of turbomolecular pumps (TPs) and equipped with apair of vacuum sensors - one for low- and one for high-vacuum range. An axis of rotation of the seventh TP (TP12in Fig. 1) is shifted off the cluster-jet axis (marked withthe broken line), so that clusters landing on its blades aredestroyed immediately into atomic hydrogen and removedoutside the beam-dump by the pump. Overall the cluster-jetbeam dump plays an important role of minimizing hydro-gen reverse load to the HESR beam-pipe with circulatingantiprotons.GSI SCIENTIFIC REPORT 2014 MU-HADRONS-01DOI:10.15120/GR-2015-1-MU-HADRONS-01 107A scheme of the beam-dump together with the vac-uum devices is presented in Fig. 1. Due to lack ofavailable space the fore-vacuum part has been ommitedfrom Fig. 1. Slow-control is accomplished with the aidof CompactRIO2 [CompactRIO1 is foreseen for thecluster-jet source] using the three indicated C-modules.The lines leading to each of them represent in fact a bunchof conductors joining e.g. a single pin (out of the 32) inthe DO-module with a particular wire going to a partic-ular valve. The DI pins receive the status information.A control of TPs (including their turning-on and -off andfollowing in real-time their essential working parameters,such as rotation speed, power consumption and tempera-ture) is accomplished via a serial bus RS-485 permitting toaccess individually each TP via its controller. Reading ofvacuum-pressure sensors involves conversion of their sig-nals into digital form within the Center-Three units withthe further making them individually addressable with theaid of RS232↔RS485 converters.The part displayed in Fig. 1 has already been pro-grammed in LabVIEW and its operation tested in a one-by-one and simultaneous turning-on and -off the seven tur-bopumps. A project of the rest of the vacuum system hasbeen developed. It will be implemented and tested togetherwith the rest of the future cluster-jet target for PANDA.References[1] G. Garzolio et al., Nucl. Instr. and Meth. A519 (2004) 558[2] Technical Design Report for the ¯PANDA Internal Targets:The Cluster-Jet Target and Developments for the Pellet Tar-get, The ¯PANDA Collaboration: W. Erni et al., http://www-panda.gsi.de/archive/TargetTDR/Targets TDR.pdfMU-HADRONS-01 GSI SCIENTIFIC REPORT 2014108 DOI:10.15120/GR-2015-1-MU-HADRONS-01

Slow-control system for the Hydrogen Cluster-Jet Test Facility at GSI

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Slow-control system for the Hydrogen Cluster-Jet Test Facility at GSI

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