diff --git a/docs/mdm/cbd.md b/docs/mdm/cbd.md index 1c62a67..192778d 100644 --- a/docs/mdm/cbd.md +++ b/docs/mdm/cbd.md @@ -4,15 +4,72 @@ description: Here a list of all uncontrolled / critical beam dumps is kept template: main.html --- + + +## 14 - Mon 06-Oct-25 18:36 +* BDC Triggered by **LLRF for Storage Ring Cavity 3** at **402 mA** +* **Root cause:** Classical ion instability due to bad vacuum in X02SA with U15 gap closed +* **Issue:** Uncontrolled loss of 400 mA at thin septum and collimators +* Filling gap of 50 buckets and vacuum interlock at 1e-7 mbar +* Vacuum interlock is triggered but far too late with 200 ms delay +* [https://elog-gfa.psi.ch/SLS/62668](https://elog-gfa.psi.ch/SLS/62668) + +## 13 - Sat 04-Oct-25 17:09 +* BDC Triggered by **LLRF for Storage Ring Cavity 2** at **402 mA** +* **Root cause:** xxxx +* **Issue:** Libera data indicates uncontrolled beam loss +* RadFET indicates controlled beam loss +* [https://elog-gfa.psi.ch/SLS/62639](https://elog-gfa.psi.ch/SLS/62639) + +## 12 - Tue 30-Sep-25 13:55 +* BDC Triggered by **Orbit Deviation** at **53 mA** +* **Root cause:** xxxx +* **Issue:** Uncontrolled beam loss at thin septum +* happened during MD [kw40](https://sls.gitpages.psi.ch/schedule/#2025-kw40) +* [https://elog-gfa.psi.ch/SLS/62568](https://elog-gfa.psi.ch/SLS/62568) + +## 11 - Mon 29-Sep-25 17:18 +* **Root cause:** Vacuum in injection straight +* **Issue:** Uncontrolled loss of 385 mA at thin septum +* VCS: ARS01 VPIC 0010 :PUMP1-PRESSURE +* Beam lost over ~5 s +* [https://elog-gfa.psi.ch/SLS/62552](https://elog-gfa.psi.ch/SLS/62552) + +## 10 - Sun 28-Sep-25 11:10 +* **Root cause:** Vacuum in injection straight +* **Issue:** Uncontrolled loss of 400 mA at thin septum +* VCS: ARS01 VPIC 0010 :PUMP1-PRESSURE +* Beam lost over ~5 s +* not clear since RadFET indicates good dump and while Libera loss data does not agree +* steep drop of lifetime before beam loss also indicates uncontrolled beam loss since usually faster than vacuum interlock +* [https://elog-gfa.psi.ch/SLS/62525](https://elog-gfa.psi.ch/SLS/62525) + +## 9 - Fri 26-Sep-25 03:37 +* **Root cause:** Classical ion instability due to bad vacuum in X02SA with U15 gap closed +* **Issue:** Uncontrolled loss of 400 mA at thin septum and collimators +* Filling gap of 50 buckets and vacuum interlock at 1e-7 mbar +* Vacuum interlock is triggered but far too late with 230 ms delay +* [https://elog-gfa.psi.ch/SLS/62668](https://elog-gfa.psi.ch/SLS/62492) + ## 8 - Thu 25-Sep-25 22:58 -* **Root cause:** vacuum / ID gap / ion instability -* Repetition of Nr. 7 -* Vacuum Interlock threshold now reduced -* Filling pattern gap increased from 30 to 50 buckets +* **Root cause:** Classical ion instability due to bad vacuum in X02SA with U15 gap closed +* **Issue:** Uncontrolled loss of 400 mA at thin septum and collimators +* Filling gap of 30 buckets and vacuum interlock at 4e-7 mbar +* From now on: + * Vacuum Interlock threshold now reduced to 1e-7 mbar + * Filling pattern gap increased from 30 to 50 buckets * [https://elog-gfa.psi.ch/SLS/62484](https://elog-gfa.psi.ch/SLS/62484) ## 7 - Thu 25-Sep-25 18:04 -* **Root cause:** vacuum / ID gap / ion instability +* **Root cause:** Classical ion instability due to bad vacuum in X02SA with U15 gap closed +* **Issue:** Uncontrolled loss of 400 mA at thin septum and collimators * Beam dump seems to be caused by an initially slow-rising vacuum spike inside the X02SA U15 undulator * Lifetime went down from 8 hours to <2 hours slowly in the last 5 minutes before the beam dump simultaneously with the pressure going up * The observed vacuum spike could be a classical ion instability @@ -22,7 +79,7 @@ template: main.html * [https://elog-gfa.psi.ch/SLS/62482](https://elog-gfa.psi.ch/SLS/62482) ## 6 - Tue 23-Sep-25 15:56 -* Root cause: **FOFB writes bad values to correctors** +* **Root cause:** FOFB writes bad values to correctors * Happened during BPM Sector reboot, i.e., overall reliability issue with BPM/FOFB system * Beam dump controller only triggered by RF stations * Post mortem data clearly shows that beam was lost before dump kicker was fired diff --git a/mkdocs.yml b/mkdocs.yml index cdcbfd9..f8f1cce 100644 --- a/mkdocs.yml +++ b/mkdocs.yml @@ -1,5 +1,5 @@ -site_name: SLS 2.0 Operations Management -site_description: SLS 2.0 Operations Management +site_name: SLS 2.0 Operation +site_description: SLS 2.0 Operation site_author: Felix Armborst # based on CERN PS-MPC site by A. Huschauer site_url: https://sls.gitpages.psi.ch/ @@ -148,6 +148,7 @@ nav: - 'Beamlines': - 'Contacts' : uom/BeamlineContacts.md - 'UOM minutes': uom/minutes/uom.md + - 'SU Permits' : uom/minutes/uom.md - 'Schedule' : - '2025' : schedule.md