1. 14/1/20097 January 2009MICE CM23 - Harbin - Beamline Session1 MICE Beamloss Data Adam Dobbs

2. 14/1/20097 January 2009MICE CM23 - Harbin - Beamline Session2 MICE Beam Loss Studies Overview Purpose – understand beam loss in ISIS due to MICE target Analogue ISIS beam loss signals (total ring loss, total sector 7 and 8 loss) readout by a MICE DAQ ISIS beam intensity, position and MICE target position signals also recorded by the DAQ DAQ operates at 100 kHz 2

3. 14/1/20097 January 2009MICE CM23 - Harbin - Beamline Session3 Raw Data 3

4. 14/1/20097 January 2009MICE CM23 - Harbin - Beamline Session4 Averaged Data 4 MICE beamloss ISIS at normal rep rate, 5 spills shown, MICE target dip on first spill

5. 14/1/20097 January 2009MICE CM23 - Harbin - Beamline Session5 Averaged Data – reduced rep rate 5 ISIS at reduced rep rate => No spills without target present so cannot subtract background!

6. 14/1/20097 January 2009MICE CM23 - Harbin - Beamline Session6 Background-subtracted Data (not averaged) 6 -used to make lookup table of target depth and beamloss for every actuation

7. 14/1/20097 January 2009MICE CM23 - Harbin - Beamline Session7 Averaged and BG-subtracted 7 Data set 15-12-08_07

8. 14/1/20097 January 2009MICE CM23 - Harbin - Beamline Session8 Averaged and BG-subtracted Electronics artefact Possible losses from target scraping beam at injection 8

9. 14/1/20097 January 2009MICE CM23 - Harbin - Beamline Session9 Target Depth Vs Time 9 Data set 19-12-08_00-03 - maximum target depth of each actuation over period of a run (of order hours). Below is for the evening of the target failure on 19-12-08

10. 14/1/20097 January 2009MICE CM23 - Harbin - Beamline Session10 Data set 15-12-08_00-01 Target Position Vs Beamloss: actual -from a typical run 10 Depth(mm) = Grad*Depth(V)+Off Grad = 10.1737 Off= 22.5089 1V -> 32.68mm, 1.25V -> 35.23mm

11. 14/1/20097 January 2009MICE CM23 - Harbin - Beamline Session11 8 January 2009MICE Target Meeting11 Data set 19-12-08_00-03 Target Position Vs Beamloss: actual -from a night of target failure on 19-12-08. Severely reduced beamloss

12. 14/1/20097 January 2009MICE CM23 - Harbin - Beamline Session12 Zoomed 12 Data set 19-12-08_00-03 Quantisation of data for target position – note scale

13. 14/1/20097 January 2009MICE CM23 - Harbin - Beamline Session13 Further Zoomed 13 Data set 19-12-08_00-03 A 2 nd quantisation of data for target position at smaller scale. Possible causes are discrete ruler measures used by laser position system, and the digitisation process