[FFA_CEBAF_Collab] [EXTERNAL] Re: FFA at CEBAF WG mtg. this Friday, June 24 at 11:00 am

[Jay Benesch]

Dejan, 

Of order 500 W/m.  Power density will be the engineering issue. 

Jay 
________________________________________
From: Trbojevic, Dejan <trbojevic at bnl.gov>
Sent: Sunday, June 26, 2022 3:11 PM
To: Jay Benesch; Brooks, Stephen
Cc: ffa_cebaf_collab at jlab.org; Douglas Higinbotham
Subject: Re: [FFA_CEBAF_Collab] [EXTERNAL] Re: FFA at CEBAF WG mtg. this Friday, June 24 at 11:00 am

Dear Jay,

I could translate the energy loss due to synchrotron radiation into the power loss using your beam currents very easily.

Best from,
Dejan

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From: FFA_CEBAF_Collab <ffa_cebaf_collab-bounces at jlab.org> on behalf of Jay Benesch via FFA_CEBAF_Collab <ffa_cebaf_collab at jlab.org>
Sent: Friday, June 24, 2022 3:48:44 PM
To: Brooks, Stephen <sbrooks at bnl.gov>
Cc: ffa_cebaf_collab at jlab.org <ffa_cebaf_collab at jlab.org>; Douglas Higinbotham <doug at jlab.org>
Subject: Re: [FFA_CEBAF_Collab] [EXTERNAL] Re: FFA at CEBAF WG mtg. this Friday, June 24 at 11:00 am

Colleagues,

One reason I've been pushing 4 EM at 1200 MeV and four FFA passes to ~20
GeV is current capability.  At best the CMs can be pushed to ~720 uA
total beam current.  Two halls at 45 uA each, eight passes totals 720
uA.  If we're limited to 500 uA because a heat exchanger in the beam
dump system is not upgraded and we can't lower cavity input Qs, 31.25 uA
for each of two high current halls on last pass.  At 11 passes total,
22.7 uA/hall at 500 uA total, 32.7 uA/hall at 720 uA total.  900 kW
power limit per dump, so 45 uA at 20 GeV just works, while higher
energies require less current.  A lot of the suggestions I've seen from
the high current halls assume high luminosity aka beam current.

Jay
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