the MICE beam line status a) RATE in MICE BL much lower (~500 x) than requested to do physics b) The BL still need to be characterized: a) Progress during summer shifts heard b) Other needed: e.g. what is the ACTUAL EMITTANCE of the beam? c) Optics: 1. Muon BL: P=208 MeV/c, emi_N= 7 mm rad “ ... the mother of all the beamlines “ 2. Proton BL: derived from (a) by rescaling magnet currents according to local momenta. P=440 MeV/c. Used since Apr. 2008 for initial calibrations/set-up. W and WO decay solenoid (DS). 3. Pion BL: from (a), ditto (b). P=440/300 MeV/c. W and WO DS 4. Electron BL: from (a), ditto (b). P=330 MeV/c. W and WO DS. Used for PID calibrations. NB: values currently used for the 1 st triplet (from Logbook) are not the ones suggested in the Optics site. Has anyone a clue why? 5. NB1: many BLs for different flavours (p, , and e): needed for detector calibrations d) A new WEB PAGE exists (with link to the old one) mice.iit.edu/bl e) Regular bi-weekly meetings (started on 3/10/2008)
RATE in MICE BL much lower (~500 x) than requested to do physics The BL still need to be characterized: Progress during summer shifts heard Other needed: e.g. what is the ACTUAL EMITTANCE of the beam? Optics: - PowerPoint PPT Presentation
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
the MICE beam line status a) RATE in MICE BL much lower (~500 x) than requested to do physicsb) The BL still need to be characterized:
a) Progress during summer shifts heardb) Other needed: e.g. what is the ACTUAL EMITTANCE of the beam?
c) Optics: 1. Muon BL: P=208 MeV/c, emi_N= 7 mm rad “ ... the mother of all the beamlines “
2. Proton BL: derived from (a) by rescaling magnet currents according to local momenta. P=440 MeV/c. Used since Apr. 2008 for initial calibrations/set-up. W and WO decay solenoid (DS).
3. Pion BL: from (a), ditto (b). P=440/300 MeV/c. W and WO DS
4. Electron BL: from (a), ditto (b). P=330 MeV/c. W and WO DS. Used for PID calibrations. NB: values currently used for the 1st triplet (from Logbook) are not the ones suggested in the Optics site. Has anyone a clue why?
5. NB1: many BLs for different flavours (p, , and e): needed for detector calibrations
d) A new WEB PAGE exists (with link to the old one) mice.iit.edu/bl e) Regular bi-weekly meetings (started on 3/10/2008)
To do list ...
c) TOF work (M. Rayner): use TOF stations as emittance measurement devices (Analysis-CM22, Tuesday) d) Customize beamline using local momenta [CAVEAT still work in progress]
http://www.isis.rl.ac.uk/accelerator/MICE/Task%20Notes%20and%20Specifications/beamline%20-%20optics/some_reference_data.htmGeneral Optics Scaling Spreadsheet for commissioning (MA/KT): Here:- Beamline Scaling
a) Low proton/pion rate in MICE. a) ISIS beam simulation (ORBIT, A.Dobbs: CM22 Sunday) and interaction with TGT signals on BLM7,8b) Is pion capture optimal ? In other words, is the first Q-pole focusing at the right position? c) Where is the tgt dipping ? dimensional survey available MICE Note 216 COMMENT: believe we will have to optimize our tgt dipping and negotiate with ISIS about beam losses. b) and c) can improve our rate(and possibly explain other discrepancies) but they will NOT “recover” a factor 500.
b) PSI solenoid sick! Last coil missing new optics sought. Which way (i.e. code?)a) TPT/TTL (more natural and fast to define the optics)b) G4MICE (I believe it is quite useful for a further hi-definition study)c) G4beamline (as above)d) Q.: check geometries vs dimensional survey
e) Conversion field/current: status in the MLCR ? f) A new web page is born ... Need to be filledg) Complete the (e,P) matrix: P=140/240 MeV/c, emi_N= 2,10 mm rad (*)
TURTLE – a better look at the muon BL (just before D2 on)
After D1
In Q4
Q5?
Just before diffuser
B2
Q4
Q5
Q6
Q7
Q8
Q9
PbPT
B1B2 Q4 Q5 Q6 Q7 Q9Q8
Pb.Disk
Vertical Half-width
(cm)
HorizontalHalf-width
(cm)
25
0
25
16mz
B2
Q4
Q5
Q6
Q7
Q8
Q9
PbPT
B1B2 Q4 Q5 Q6 Q7 Q9Q8
Pb.Disk
Vertical Half-width
(cm)
HorizontalHalf-width
(cm)
25
0
25
B2
Q4
Q5
Q6
Q7
Q8
Q9
PbPT
B1B2 Q4 Q5 Q6 Q7 Q9Q8
Pb.Disk
Vertical Half-width
(cm)
HorizontalHalf-width
(cm)
25
0
25
16mz
q4
q5
q6
q7
q8
q9
-25
-20
-15
-10
-5
0
5
10
15
20
25
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Diffuser
B2
Q4
Q5
Q6
Q7
Q8
Q9
PbPT
B1B2 Q4 Q5 Q6 Q7 Q9Q8
Pb.Disk
Vertical Half-width
(cm)
HorizontalHalf-width
(cm)
25
0
25
16mz
B2
Q4
Q5
Q6
Q7
Q8
Q9
PbPT
B1B2 Q4 Q5 Q6 Q7 Q9Q8
Pb.Disk
Vertical Half-width
(cm)
HorizontalHalf-width
(cm)
25
0
25
B2
Q4
Q5
Q6
Q7
Q8
Q9
PbPT
B1B2 Q4 Q5 Q6 Q7 Q9Q8
Pb.Disk
Vertical Half-width
(cm)
HorizontalHalf-width
(cm)
25
0
25
16mz
q4
q5
q6
q7
q8
q9
-25
-20
-15
-10
-5
0
5
10
15
20
25
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
B2
Q4
Q5
Q6
Q7
Q8
Q9
PbPT
B1B2 Q4 Q5 Q6 Q7 Q9Q8
Pb.Disk
Vertical Half-width
(cm)
HorizontalHalf-width
(cm)
25
0
25
16mz
B2
Q4
Q5
Q6
Q7
Q8
Q9
PbPT
B1B2 Q4 Q5 Q6 Q7 Q9Q8
Pb.Disk
Vertical Half-width
(cm)
HorizontalHalf-width
(cm)
25
0
25
B2
Q4
Q5
Q6
Q7
Q8
Q9
PbPT
B1B2 Q4 Q5 Q6 Q7 Q9Q8
Pb.Disk
Vertical Half-width
(cm)
HorizontalHalf-width
(cm)
25
0
25
16mz
q4
q5
q6
q7
q8
q9
-25
-20
-15
-10
-5
0
5
10
15
20
25
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
DiffuserTurtle Simulation: KT BL design official doc
D2 entrance
Y (cm)
X (cm)
(b) 9/10 solenoid case – a snapshot with Transport
purpose: understand how the beam envelope changes when operating with a reduced solenoid == last coil silenced
comment: we may want to know it for future decisions
A finer assessment should rely on higher codes (G4XXX)
13MICE Beam Line PC - 031008
Dx ~ 11 cm
Dx ~ 5 cm
Dx ~ 9 cm
Dx ~ 4 cm
Used transport with (444 MeV/c pions):http://www.isis.rl.ac.uk/accelerator/MICE/Task%20Notes%20and%20Specifications/beamline%20-%20optics/referencedecks&matching.htmCM14-7.1-200 Transport.FILE1.dat
- all DECAY SOLENOID red- reduced DS (9/10) cyan
MICE Beam Line PC - 031008 16
This is Kevin Optics for 440 MeV/c protonsWITH NO SOLENOID
Clearly removing the last coil from the solenoid introduces a growthof the beta: 0+(s-s0)2/0 a linear growth in the envelope
However a solution for 440 MeV/c from production to Q6 exists whichProduces a decent result. I need to find the TPT deck and have some trials.
(d) an example of beamline re-scaling for electrons (similar tables exist for p and pi)(using smart excel tables)
- from this preliminary study a misalignment is noticed which correspond to an angle of 0.286o : it is the angle by which the bottom tip of the target (at its lowest point) sees the entrance of Q1
- how important is this to pion collection at the 1st Q-pole? - my gut feeling says: not relevant- the real answer should rely on a MC simulation
- I used an old reference (1st survey by CCLRC) because I think I understand the drawings. Also partly used info from note 216, but I found it a bit more difficult to understand. So I want to have the latest figures and re-calculate the axis of the q-poles towards the target plane
- before launching yourself into simulations let me be convinced of the numbers