Groups and Machines

Figure: Overview on GSI accelerators. Click here for a larger image.

Overview

Accelerator equipment relevant for the control system is organized in groups. The Data Master of the timing system generates command messages for groups, but not for individual equipment. The equipment within a group belongs together conceptually. An example of a group might a ring machine. The ordering of equipment into groups is defined by the way the accelerator complex is operated. With the new timing system, the group ID is analogous to a machine ID.

In principle, the ordering of equipment into groups depends on the role of the equipment for the production of a specific beam. There are two schools of thought.

CCT (Controls Coordination)

• A group is a collection of equipment that always belongs together.
• A specific equipment may only be member of one group.
• A specific equipment always belongs to the same group (that assignment to a group does not depend on a beam).
• Many groups (> 200) are required for the operation of the machine.

Timing Team

• What belongs together happens together.
• A specific equipment may be member of more than one group.
• When the operational concept of the machine is changed, new groups can be introduced and specific equipment can join another group too.
• The number of existing groups may be large
• The number of groups for the production of specific beams is small.

As the view of the CCT can be seen as a special case for the more general view by the Timing Team. Both concepts can coexist, as long as the principle what belongs together happens together is not broken. This implies, that a timing receiver node must not (never!) be configured for more than one group at a time. In the long term, a migration to the concept of the Timing Team is possible. Then, a timing receiver node can be configured for many groups at the same time.

Group IDs

A group ID has 12 bit. This is divided into two ranges

• 0d0000..0d1023 (0x000-0x3ff): operative, assignment by CCT
• 0d1024..0d4095 (0x400-0xfff): reserved, assignment by TOS

Fig 1: Timing Groups. Shown are rings (yellow), electron coolers (blue), ion sources (orange), UNILAC sections (magenta), intersections (grey) and targets (green). A timing group (solid arrow) is named using the scheme origin_TO_destination, see table below. The group ID GID is given in decimal and hex on the right side of an arrow (rings, electron coolers: inside box). Dashed arrows are used to guide the eye and do not represent timing groups. Boxes with dark green (pink) borders denote accelerators (TVS and NE areas), but the assignment of nodes to accelerators might not be correct for all cases.

Groups for Operation

0dGID	0xGID	Name	Description
200	C8	YRT1_TO_YRT1LQ1	from ion source 1 to merging quadrupole
201	C9	YRT1LQ1_TO_YRT1LC1	from merging quadrupole at ion sources to chopper
202	CA	YRT1LC1_TO_YRT1MH2	injector from chopper to merging dipole
203	CB	YRT1MH2_TO_CRYRING	from merging dipole to ring
210	D2	CRYRING_RING	CRYRING ring
211	D3	CRYRING_COOLER	CRYRING electron cooler
212	D4	CRYRING_TO_YRE	Experiment line from CRYRING to YRE
300	12C	SIS18_RING	SIS18 ring
301	12D	SIS18_COOLER	SIS18 electron cooler
310	136	SIS100_RING	SIS100 ring
340	154	ESR_RING	ESR ring
341	155	ESR_COOLER	ESR electron cooler
345	159	ESR_TO_HTR	ESR to HITRAP
350	15E	CR_RING	CR ring
360	168	HESR_RING	HESR ring
400	190	TO_BE_DISCUSSED	PLINAC proton source
448	1C0	PZU_QR	UNILAC Timing - Source Right
449	1C1	PZU_QL	UNILAC Timing - Source Left
450	1C2	PZU_QN	UNILAC Timing - Source High Charge State Injector (HLI)
451	1C3	PZU_UN	UNILAC Timing - High Charge State Injector (HLI)
452	1C4	PZU_UH	UNILAC Timing - High Current Injector (HSI)
453	1C5	PZU_AT	UNILAC Timing - Alvarez Cavities
454	1C6	PZU_TK	UNILAC Timing - Transfer Line
498	1F2	GTK3MV4_TO_PLTKMH2	GTK3MV4 to PLTKMH2
499	1F3	PLTKMH2_TO_SIS18	PLTKMH2 to SIS18
500	1F4	SIS18_TO_GTS1MU1	SIS extraction to GTS1MU1
501	1F5	GTS1MU1_TO_GTE3MU1	GTS1MU1 to GTE3MU1
502	1F6	GTE3MU1_TO_GTS6MU1	GTE3MU1 to GTS6MU1
503	1F7	GTS6MU1_TO_GTS6MU1	GTS6MU1_TO_GTS6MU1
504	1F8	GTS6MU1_TO_ESR	GTS6MU1 to ESR
505	1F9	GTS1MU1_TO_GTS3MU1	GTS1MU1 to GTS3MU1
506	1FA	GTS3MU1_TO_HHD	GTS3MU1 to HHD Dump
507	1FB	GTS3MU1_TO_GHFSMU1	GTS3MU1 to GHFSMU1
508	1FC	GHFSMU1_TO_HFS	Experiment line to HFS
509	1FD	GHFSMU1_TO_GTS6MU1	GHFSMU1 to GTS6MU1
510	1FE	GTS6MU1_TO_GTS7MU1	GTS6MU1 to GTS7MU1
511	1FF	GTE3MU1_TO_GHHTMU1	GTE3MU1 to GHHTMU1
512	200	GHHTMU1_TO_HHT	Experiment line to the high temperature experiment HHT
513	201	GHHTMU1_TO_GTH3MU1	GHHTMU1 to GTH3MU1
514	202	GTH3MU1_TO_GTP1MU1	GTH3MU1 to pion branch GTV2MU3
515	203	GTP1MU1_TO_HADES	Experiment line to the electron-positron-detector HADES (High Acceptance Di-Electron Spectrometer)
516	204	GTH3MU1_TO_GTS7MU1	GTH3MU1 to GTS7MU1
517	205	GTS7MU1_TO_GTH4MU1	GTS7MU1 to GTH4MU1
518	206	GTH4MU1_TO_HTM	Experiment line to the particle therapy experiment HTM
519	207	GTH4MU1_TO_GTH4MU2	GTH4MU1 to GTH4MU2
520	208	GTP1MU1_TO_GTH4MU2	GTP1MU1 to GTH4MU2 pion transfer line
521	209	GTH4MU2_TO_GTV1MU1	GTH4MU2 to GTV1MU1
522	20A	GTV1MU1_TO_GHTDMU1	GTV1MU1 to GHTDMU1
523	20B	GTV1MU1_TO_GTV2MU2	GTV1MU1 to GTV2MU2
524	20C	ESR_TO_GTV2MU2	ESR extraction to TV2MU2
525	20D	GHTDMU1_TO_HTC	Experiment line to nuclear reaction experiments at HTC (exotic nuclei and nuclear dynamics)
526	20E	GTV2MU2_TO_GTV2MU3	GTV2MU2 to GTV2MU3
527	20F	GTV2MU3_TO_HTA	Experiment line to HTA
528	210	GTV2MU3_TO_GHTBMU1	GTV2MU3 to GHTBMU1
529	211	GHTBMU1_TO_HTP	Experiment line to HTP Dump
530	212	GHTDMU1_TO_HTD	Experiment line to HTD
531	213	GHTBMU1_TO_YRT1MH2	GHTBMU1 to YRT1MH2
928	3A0	SIS18_B2B_EXTRACT	B2B internal: extraction from SIS18
929	3A1	SIS18_B2B_ESR	B2B internal: transfer SIS18 to ESR
930	3A2	SIS18_B2B_SIS100	B2B internal: transfer SIS18 to SIS100
933	3A5	ESR_B2B_EXTRACT	B2B internal: extraction from ESR
934	3A6	ESR_B2B_CRYRING	B2B internal: transfer ESR to CRYRING
938	3AA	CRYRING_B2B_EXTRACT	B2B internal: extraction from CRYRING
944	3B0	SIS100_B2B_EXTRACT	B2B internal: extraction from SIS100
1023	3FF	local	for timing receiver local use; never sent by Data Master, not used by LSA, not in database

Table 1: Group IDs for operation. The table has been extracted from the Controls Data Base on 28 September 2021.

Groups for Testing

For testing the timing system, some test groups are defined for internal use.

GID	Name	Description
0xFA0	Geminga	ion source
0xFA1	Alcor	linear machine
0xFA2	Mizar	ring machine
0xFA3	Heart Nebula	simple heartbeat
0xFA4	Vela	ion source / linac
0xFA5	Sagittarius A*	idle or dummy
0xFFF	LocalGroup	never sent by data master

Table 2: Some groups for testing. The names are a tribute to our releases asterisk and Balloon.

Supplementary Material

Transfer Channel (TK)

Figure: Overview on Transfer Channel between UNILAC and SIS18. The merging magnet 'PLTKMH2' from the pLinac is indicated as 'T??MU?'. Figure adopted from Accnomen Wiki. Click here for larger image.

SIS18, ESR, GSI-HEBT ('HEST')

Figure: (Outdated) overview on the GSI facility and some optic elements (figure by Benno and others provided through Regine Pfeil, GSI). Click here for larger image.

Figure: (Updated but less detailled) overview on the GSI facility and some optic elements (figure by uknown author, GSI). Click here for larger image.

Figure: Transer line from SIS18 to ESR. Figure adopted from Accnomen Wiki. Click here for larger image.

Figure: Transer lines FRS (HHT). Figure adopted from Accnomen Wiki. Click here for larger image.

Figure: Transfer line from SIS18 to target hall (HHT and HAD). Figure adopted from Accnomen Wiki. Click here for larger image.

Figure: Transfer lines target hall. Figure adopted from Accnomen Wiki. Click here for larger image.

Figure: Transfer line from ESR to HITRAP.

CRYRING

Figure: Overview on CRYRING (figure provided through Frank Herfurth, GSI)

NE Zones

Figure: Overview on the NE areas (safety zones) at GSI (figure by some people provided through Regine Pfeil, GSI). Click here for larger image.

pLinac

Figure: Overview on pLinac. The merging magnet 'PLTKMH2' into the Transfer Channel (TK, section 8) is indicated as 'PLTK' (figure provided through Accnomen Wiki, GSI)

-- DietrichBeck - 22 July 2021