====== DC Beam Current Transformers in GSI Accelerators====== {{:instrumentss:n-dcct:s09_es.jpg?nolink&400|}} **In October 1988, the first GSI-made DCCT had been installed in SIS18, Period 09** {{:ed:traf88sw3.png?nolink&600|}} **GS09DT-ML, first beam measured on Nov. 23rd 1988 (3/4 turn into F-Cup S12)**\\ **\\ In 1992, a second GSI-DCCT was manufactured, modified according to the requirements of the ESR:** {{:ed:img_1338.jpg?nolink&400|}} **GE02DT-ML, with the associated electronics crate mounted below** ---- As the beam intensities in UNILAC and hence in SIS18 were increased continuously over the years, the GSI-DCCT GS09DT-ML suffered from servo loop stability problems, leading to low frequency oscillations and unreliable results during the acceleration ramp. Hence, in 2006 a commercially available DCCT (Bergoz NPCT) was additionally installed in period S07: {{:instrumentss:n-dcct:npct_s07dt_ml-2.jpg?nolink&600|}} **GS07DT-ML, still in lab** {{:instrumentss:n-dcct:comp_dcct.png?nolink&600|}} **The stability problems became visible by recording the normalized output signals of both DCCTs during a typical acc. ramp, at 56mA flat top current:** {{:instrumentss:n-dcct:s01dtxx_3.jpg?nolink&600|}} **GS07DT-ML after it was moved to S01 in 2014** After installation, first beam tests showed a much stronger sensitivity against external magnetic fields, dominated by the dipole magnet close by: {{ :instrumentss:n-dcct:vergleich_s09-s07.pdf |}} After it was moved to period 01, further investigations showed an even stronger influence of magnetic stray fields: {{ :instrumentss:n-dcct:s01dtl_dipoledistortion-5.pdf}} The results must be taken into account for any future measures applied to data correction by hard- or software. **DC Beam Current Transformers in SIS18 and ESR - Manuals & Specifications:** [[https://www-bd.gsi.de/dokuwiki/lib/exe/fetch.php?media=instrumentss:n-dcct:npctflyer.pdf|GS01DT-ML Bergoz NPCT flyer]]\\ [[https://www-bd.gsi.de/dokuwiki/lib/exe/fetch.php?media=instrumentss:n-dcct:npct_man.pdf|GS01DT-ML Bergoz NPCT manual]]\\ [[https://www-bd.gsi.de/dokuwiki/lib/exe/fetch.php?media=instrumentss:n-dcct:sis18-dcct_gs09dt-ml_v1.pdf|GS09DT-ML Technical Infos]]\\ [[https://www-bd.gsi.de/dokuwiki/lib/exe/fetch.php?media=instrumentss:n-dcct:esr-dcct_ge02dt-ml_v2.pdf|GE02DT-ML Technical Infos]]\\ **DC Beam Current Transformers in SIS18 and ESR - Power-Up and Adjustments:** [[https://www-bd.gsi.de/dokuwiki/lib/exe/fetch.php?media=instrumentss:n-dcct:null_arbeitspunkt_gs09dt-ml.pdf|GS09DT-ML: Adjusting of Working and Zero Points]]\\ [[https://www-bd.gsi.de/dokuwiki/lib/exe/fetch.php?media=instrumentss:n-dcct:wieder-einschaltung_gs09dt-ml.pdf|GS09DT-ML: Power-Up & Re-commissioning]]\\ \\ [[https://www-bd.gsi.de/dokuwiki/lib/exe/fetch.php?media=instrumentss:n-dcct:null_arbeitspunkt_ge02dt_ml.pdf|GE02DT-ML: Re-commissioning, Adjusting of Working and Zero Points]]\\ ---- ---- **Since 2015, the old Bergoz-PCT from MSL is installed in the adapted and reconstructed Cryring:** * an electronic front end box is mounted ** closely to the toroid/beam tube**, see below * a 19" half-unit electronic backend chassis is installed ** in the Cryring BI container** * dual-layer inner magnetic shield (μ-metal) * single-layer outer magnetic shield (soft iron) * single-turn induction loop wound across yoke of YR08MH for compensation of dI/&dt-induced errors -> induced current is coupled into PCT toroid by single-turn winding via adjustable R {{:instrumentss:n-dcct:pict0419.jpg?nolink&600|}} **YR8DT-L, after additional soft iron shield was added** {{:ed:yr8dt1l_2.jpg?nolink&400|}} **YR8DT1L, inner μ-metal (dual layer) shield visible** {{:instrumentss:n-dcct:pict0423.jpg?nolink&600|}} **YR8DT1L, Bergoz head amplifier box (viewed from inner side of the ring)** ---- **DC Beam Current Transformer in Cryring@ESR - Manual & Specification:** [[https://www-bd.gsi.de/dokuwiki/lib/exe/fetch.php?media=ed:bergoz-pct_flyer.pdf|YR8DT1L Bergoz PCT flyer]]\\ [[https://www-bd.gsi.de/dokuwiki/lib/exe/fetch.php?media=ed:bergoz_pct_man.pdf|YR8DT1L Bergoz PCT manual]]\\ [[https://www-bd.gsi.de/dokuwiki/lib/exe/fetch.php?media=ed:Unser-PCT.pdf|K. Unser: paper "The PCT..."]]\\ ---- **S09DT-ML DCCT Documentation** Overview documents:\\ {{ :instrumentss:n-dcct:dcct-s09dtml-overview1.pdf |}} \\ {{ :instrumentss:n-dcct:dcct-s09dtml-overview2.pdf |}}\\ {{ :instrumentss:n-dcct:dcct-s09dtml-overview3.pdf |}}\\ {{ :instrumentss:n-dcct:dcct-s09dtml-overview4.pdf |}} ^ Description ^ PCB Name ^ PCB Index ^ Schematics ^ Layout ^ BOM ^ Images ^ |Modulator|MOD AMP| F376.030| {{ :instrumentss:n-dcct:dcct-s09dtml-f376.030-sch.pdf |}}| {{ :instrumentss:n-dcct:dcct-s09dtml-f376.030-brd.pdf |}}| | | |Demodulator / Filter|DEM/FIL| F376.040| {{ :instrumentss:n-dcct:dcct-s09dtml-f376.040-sch.pdf |}}| |{{ :instrumentss:n-dcct:dcct-s09dtml-f376.040-bom1.pdf |}} \\ {{ :instrumentss:n-dcct:dcct-s09dtml-f376.040-bom2.pdf |}} | | |Regelverstärker|CTRL AMP| F376.050|{{ :instrumentss:n-dcct:dcct-s09dtml-f376.050-sch.pdf |}} |{{ :instrumentss:n-dcct:dcct-s09dtml-f376.050-brd.pdf |}} |{{ :instrumentss:n-dcct:dcct-s09dtml-f376.050-bom1.pdf |}} \\ {{ :instrumentss:n-dcct:dcct-s09dtml-f376.050-bom2.pdf |}} \\ {{ :instrumentss:n-dcct:dcct-s09dtml-f376.050-bom3.pdf |}} \\ {{ :instrumentss:n-dcct:dcct-s09dtml-f376.050-bom4.pdf |}} | | |Präzisionsverstärker|PREC AMP| F376.060| {{ :instrumentss:n-dcct:dcct-s09dtml-f376.060-sch.pdf |}} | {{ :instrumentss:n-dcct:dcct-s09dtml-f376.060-brd.pdf |}}|{{ :instrumentss:n-dcct:dcct-s09dtml-f376.060-bom1.pdf |}} \\ {{ :instrumentss:n-dcct:dcct-s09dtml-f376.060-bom2.pdf |}} \\ {{ :instrumentss:n-dcct:dcct-s09dtml-f376.060-bom3.pdf |}} \\ {{ :instrumentss:n-dcct:dcct-s09dtml-f376.060-bom4.pdf |}} | {{:instrumentss:n-dcct:img_8648.jpg?linkonly|Photo}}| |Testgenerator |TEST GEN| F376.070|{{ :instrumentss:n-dcct:dcct-s09dtml-f376.070-sch.pdf |}} | | | | |Clock & Timing |TIM/CLK| F376.080| {{ :instrumentss:n-dcct:dcct-s09dtml-f376.080-sch.pdf |}} |{{ :instrumentss:n-dcct:dcct-s09dtml-f376.080-brd.pdf |}} | {{ :instrumentss:n-dcct:dcct-s09dtml-f376.080-bom1.pdf |}} \\ {{ :instrumentss:n-dcct:dcct-s09dtml-f376.080-bom2.pdf |}} | | |Auto-Zero |AUTO ZERO| F376.090|{{ :instrumentss:n-dcct:dcct-s09dtml-f376.090-sch.pdf |}} |{{ :instrumentss:n-dcct:dcct-s09dtml-f376.090-brd.pdf |}} |{{ :instrumentss:n-dcct:dcct-s09dtml-f376.090-bom1.pdf |}} \\ {{ :instrumentss:n-dcct:dcct-s09dtml-f376.090-bom2.pdf |}} |{{ :instrumentss:n-dcct:img_8652.jpg?linkonly |Photo}} | | Ripple Suppressor |RIPP. SUPP.| F376.100| {{ :instrumentss:n-dcct:dcct-s09dtml-f376.100-sch.pdf |}} |{{ :instrumentss:n-dcct:dcct-s09dtml-f376.100-brd.pdf |}} | |{{ :instrumentss:n-dcct:img_8227.jpg?linkonly |Photo}} | ---- **GS09DT-ML & GE02DT-ML DCCT U/F-Converter Documentation** FG444.021 Schematic and Layout: {{ :instrumentss:n-dcct:fg444.021_schaltplan_layout.pdf |}}\\ {{:instrumentss:n-dcct:fg444.021_top.jpg?400 |}} {{:instrumentss:n-dcct:fg444.021_bottom.jpg?400 |}}\\ ---- Link to SdaOszi021: [[http://sdaoszi021.acc.gsi.de/rfp.html?model=MSO-X 2024A|Analog S09 DCCT Signal]]